code_twain/sane/scanner.cpp

#include "scanner.h"

#include <Windows.h>
#include "../sdk/hginclude/huagaoxxx_warraper_ex.h"
#include <sane/sane_option_definitions.h>
#include "../../code_device/hgsane/sane_hg_mdw.h"
#include "sane_option_trans.h"
#include <chrono>
#include <mutex>
#include "DlgIndicator.h"
#include "DlgSetting.h"

static IMPLEMENT_OPTION_STRING_COMPARE(compare_sane_opt);

#define SET_SANE_OPT_ID(id, id_name, title, val, extension)	\
	if(compare_sane_opt(OPTION_TITLE_##title, val))			\
	{														\
		id_name##_id_ = id;									\
		extension(id);										\
	}





//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// callback 
extern "C"
{
	extern SANE_Status inner_sane_init(SANE_Int* version_code, SANE_Auth_Callback authorize);
	extern void inner_sane_exit(void);
	extern SANE_Status inner_sane_get_devices(const SANE_Device*** device_list, SANE_Bool local_only);
	extern SANE_Status inner_sane_open(SANE_String_Const devicename, SANE_Handle* handle);
	extern void inner_sane_close(SANE_Handle handle);
	extern const SANE_Option_Descriptor* inner_sane_get_option_descriptor(SANE_Handle handle, SANE_Int option);
	extern SANE_Status inner_sane_control_option(SANE_Handle handle, SANE_Int option, SANE_Action action, void* value, SANE_Int* info);
	extern SANE_Status inner_sane_get_parameters(SANE_Handle handle, SANE_Parameters* params);
	extern SANE_Status inner_sane_start(SANE_Handle handle);
	extern SANE_Status inner_sane_read(SANE_Handle handle, SANE_Byte* data, SANE_Int max_length, SANE_Int* length);
	extern void inner_sane_cancel(SANE_Handle handle);
	extern SANE_Status inner_sane_set_io_mode(SANE_Handle handle, SANE_Bool non_blocking);
	extern SANE_Status inner_sane_get_select_fd(SANE_Handle handle, SANE_Int* fd);
	extern SANE_String_Const inner_sane_strstatus(SANE_Status status);

	extern SANE_Status inner_sane_init_ex(SANE_Int* version_code, sane_callback cb, void* param);
	extern SANE_Status inner_sane_io_control(SANE_Handle h, unsigned long code, void* data, unsigned* len);
}

namespace callback
{
	static std::mutex	cb_lock_;
	typedef struct _scanner_inst
	{
		SANE_Handle dev;
		scanner* invoker;

		bool operator==(const SANE_Handle& h)
		{
			return dev == h;
		}
		bool operator==(const scanner* obj)
		{
			return invoker == obj;
		}
	}SCNINST;
	std::vector<SCNINST>	g_scanner_instances;

	int sane_event_callback(        // 注册回调的对象，需要保证该回调是多线程安全的
		SANE_Handle hdev	    // 产生事件的设备句柄
		, int code	    	    // 回调事件代码
		, void* data            // 回调事件数据，根据事件代码有所不同，参照具体事件定义		
		, unsigned int* len     // 数据长度（字节），或者event_data的缓冲区长度，详细请看相应的事件代码
		, void* param 		    // 用户自定义数据，与调用sane_init_ex传入时的保持一致
	)                      // 返回值依不同的事件代码而定，通常为“0”
	{
		std::lock_guard<std::mutex>	lock(cb_lock_);
		std::vector<SCNINST>::iterator it = std::find(g_scanner_instances.begin(), g_scanner_instances.end(), hdev);

		if (it != g_scanner_instances.end())
			return it->invoker->handle_event(code, data, len);
		else
			return 0;
	}
	void reg_callback(SANE_Handle dev, scanner* invoker)
	{
		std::lock_guard<std::mutex>	lock(cb_lock_);
		std::vector<SCNINST>::iterator it = std::find(g_scanner_instances.begin(), g_scanner_instances.end(), dev);
		if (it == g_scanner_instances.end())
		{
			SCNINST	inst;

			inst.dev = dev;
			inst.invoker = invoker;
			g_scanner_instances.push_back(inst);
		}
		else
			it->invoker = invoker;
	}
	void unreg_callback(scanner* invoker)
	{
		std::lock_guard<std::mutex>	lock(cb_lock_);
		std::vector<SCNINST>::iterator it = std::find(g_scanner_instances.begin(), g_scanner_instances.end(), invoker);
		if (it != g_scanner_instances.end())
			g_scanner_instances.erase(it);
	}
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// class scanner
scanner::scanner(SCANNERID id) : handle_(NULL), id_(id), ex_id_(EXTENSION_ID_BASE), prev_start_result_(SCANNER_ERR_NOT_START)
								, dpi_(200), tmp_path_(L""), img_ind_(0), cb_invoker_(NULL), cb_param_(NULL), working_(false)
								, ui_quit_(true), scanner_name_(L"")
{
	tmp_path_ = local_trans::a2u(hg_sane_middleware::sane_path().c_str());
	tmp_path_ += L"imgs";
	CreateDirectoryW(tmp_path_.c_str(), NULL);
	tmp_path_ += L"\\";
	img_fmt_.img_format = SANE_IMAGE_TYPE_BMP;
	img_fmt_.compress.compression = SANE_COMPRESSION_NONE;

	err_ = open();
}
scanner::~scanner()
{
	callback::unreg_callback(this);
}

std::string scanner::get_scanner_name(SCANNERID id)
{
	ScannerInfo* devs = NULL;
	long		count = 0;
	std::string	name("");

	if (hg_scanner_enum(devs, &count, true) == SCANNER_ERR_INSUFFICIENT_MEMORY)
	{
		count++;
		devs = new ScannerInfo[count];
		if (hg_scanner_enum(devs, &count, true) == SCANNER_ERR_OK)
		{
			for (int i = 0; i < count; ++i)
			{
				if (devs[i].vid == GET_SCANNER_VID(id) &&
					devs[i].pid == GET_SCANNER_PID(id))
				{
					name = devs[i].name;
					break;
				}
			}
		}
		delete[] devs;
	}

	return name;
}
value_type scanner::from_sane_type(SANE_Value_Type type)
{
	if (type == SANE_TYPE_BOOL)
		return VAL_TYPE_BOOL;
	else if (type == SANE_TYPE_INT)
		return VAL_TYPE_INT;
	else if (type == SANE_TYPE_FIXED)
		return VAL_TYPE_FLOAT;
	else if (type == SANE_TYPE_STRING)
		return VAL_TYPE_STR;
	else
		return VAL_TYPE_NONE;
}
value_limit scanner::from_sane_constraint(SANE_Constraint_Type type)
{
	if (type == SANE_CONSTRAINT_RANGE)
		return VAL_LIMIT_RANGE;
	else if (type == SANE_CONSTRAINT_STRING_LIST || type == SANE_CONSTRAINT_WORD_LIST)
		return VAL_LIMIT_ENUM;
	else
		return VAL_LIMIT_NONE;
}

int __stdcall scanner::to_int(SANE_Int v)
{
	return v;
}
float __stdcall scanner::to_float(SANE_Fixed v)
{
	return SANE_UNFIX(v);
}
void __stdcall scanner::ui_callback(ui_event uev, void* sender, void* param)
{
	((scanner*)param)->on_ui_quit(uev, sender);
}

// IRef
COM_API_IMPLEMENT(scanner, long, add_ref(void))
{
	return refer::add_ref();
}
COM_API_IMPLEMENT(scanner, long, release(void))
{
	return refer::release();
}

void scanner::on_ui_quit(ui_event uev, void* sender)
{
	switch (uev)
	{
	case UI_EVENT_CLOSE_CANCEL:			// post from indicator
		stop();
	case UI_EVENT_CLOSE_NORMAL:			// post from indicator & dlg_setting
		if (sender == indicator_.get() && setting_.get())
		{
			setting_->hide();
			setting_.reset();
		}
		else if (sender == setting_.get() && indicator_.get())
		{
			indicator_->hide();
			indicator_.reset();
		}
		ui_quit_ = true;
		break;
	case UI_EVENT_BEGIN_SCANNING:		// post from dlg_setting, so we show indicator ...
		if (start() == SANE_STATUS_GOOD)
		{
			if (indicator_.get())
				indicator_->show();
		}
		else
			setting_->enable(true);
		break;
	default:
		break;
	}
	if (cb_invoker_)
		cb_invoker_(ui_quit_ ? SANE_EVENT_SCAN_FINISHED : SANE_EVENT_WORKING, NULL, NULL, cb_param_);
}
int scanner::open(void)
{
	int			ret = close();
	std::string	name(scanner::get_scanner_name(id_));

	scanner_name_ = L"";
	if (name.empty())
		return SCANNER_ERR_DEVICE_NOT_FOUND;

	ret = hg_sane_middleware::instance()->open_device(name.c_str(), &handle_);
	if (ret == SANE_STATUS_GOOD)
	{
		scanner_name_ = local_trans::a2u(name.c_str(), CP_UTF8);
		callback::reg_callback(handle_, this);
		ret = init_options_id();
	}

	return ret;
}
int scanner::close(void)
{
	if (handle_)
		hg_sane_middleware::instance()->close_device(handle_);
	handle_ = NULL;
	ex_id_ = EXTENSION_ID_BASE;

	return SCANNER_ERR_OK;
}
int scanner::init_options_id(void)
{
	SANE_Int op_id = 1;
	const SANE_Option_Descriptor* desc = NULL;
	int ret = SCANNER_ERR_OK;

#define SET_OPT_ID(var, predef, func)	\
	SET_SANE_OPT_ID(op_id, var, predef, desc->title, func)

	while ((desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, op_id)))
	{
		SET_OPT_ID(is_multiout, DLSC, extension_none)
		else SET_OPT_ID(multiout_type, DLSCLX, extension_multiout_type)
		else SET_OPT_ID(color_mode, YSMS, extension_color_mode)
		else SET_OPT_ID(erase_color, HDHHBTX_CS, extension_erase_color)
		else SET_OPT_ID(erase_multiout_red, 24WCSTX_DLSCCH, extension_none)
		else SET_OPT_ID(erase_paper_red, 24WCSTX_DTKCH, extension_none)
		else SET_OPT_ID(is_erase_background, BJYC, extension_none)
		else SET_OPT_ID(background_color_range, BJSCFDFW, extension_none)
		else SET_OPT_ID(sharpen, RHYMH, extension_sharpen)
		else SET_OPT_ID(erase_morr, QCMW, extension_none)
		else SET_OPT_ID(erase_grids, CWW, extension_none)
		else SET_OPT_ID(error_extend, CWKS, extension_none)
		else SET_OPT_ID(is_noise_modify, HBTXZDYH, extension_none)
		else SET_OPT_ID(noise_threshold, ZDYHCC, extension_none)
		else SET_OPT_ID(paper, ZZCC, extension_paper)
		else SET_OPT_ID(is_custom_area, ZDYSMQY, extension_none)
		else SET_OPT_ID(curstom_area_l, SMQYZCmm, extension_none)
		else SET_OPT_ID(curstom_area_r, SMQYYCmm, extension_none)
		else SET_OPT_ID(curstom_area_t, SMQYSCmm, extension_none)
		else SET_OPT_ID(curstom_area_b, SMQYXCmm, extension_none)
		else SET_OPT_ID(is_size_check, CCJC, extension_none)
		else SET_OPT_ID(page, SMYM, extension_page)
		else SET_OPT_ID(blank_page_threshold, TGKBYLMD, extension_none)
		else SET_OPT_ID(resolution, FBL, extension_none)
		else SET_OPT_ID(image_quality, HZ, extension_none)
		else SET_OPT_ID(is_swap, JHZFM, extension_none)
		else SET_OPT_ID(is_split, TXCF, extension_none)
		else SET_OPT_ID(is_auto_deskew, ZDJP, extension_none)
		else SET_OPT_ID(is_custom_gamma, QYSDQX, extension_none)
		else SET_OPT_ID(bright, LDZ, extension_none)
		else SET_OPT_ID(contrast, DBD, extension_none)
		else SET_OPT_ID(gamma, JMZ, extension_none)
		else SET_OPT_ID(is_erase_black_frame, XCHK, extension_none)
		else SET_OPT_ID(deep_sample, SSYZ, extension_none)
		else SET_OPT_ID(threshold, YZ, extension_none)
		else SET_OPT_ID(anti_noise, BJKZDJ, extension_none)
		else SET_OPT_ID(margin, BYSJ, extension_none)
		else SET_OPT_ID(fill_background, BJTCFS, extension_fill_bkg_method)
		else SET_OPT_ID(is_anti_permeate, FZST, extension_none)
		else SET_OPT_ID(anti_permeate_level, FZSTDJ, extension_none)
		else SET_OPT_ID(is_erase_hole, CKYC, extension_none)
		else SET_OPT_ID(search_hole_range, CKSSFWZFMBL, extension_none)
		else SET_OPT_ID(is_filling_color, SCTC, extension_none)
		else SET_OPT_ID(is_ultrasonic_check, CSBJC, extension_none)
		else SET_OPT_ID(is_check_staple, ZDJC, extension_none)
		else SET_OPT_ID(scan_mode, SMZS, extension_none)
		else SET_OPT_ID(scan_count, SMSL, extension_none)
		else SET_OPT_ID(text_direction, WGFX, extension_text_direction)
		else SET_OPT_ID(is_rotate_bkg180, BMXZ180, extension_none)
		else SET_OPT_ID(is_check_dogear, ZJJC, extension_none)
		else SET_OPT_ID(dogear_size, ZJDX, extension_none)
		else SET_OPT_ID(is_check_skew, WXJC, extension_none)
		else SET_OPT_ID(skew_range, WXRRD, extension_none)
		else SET_OPT_ID(black_white_threshold, HBTXYZ, extension_none)
		op_id++;
	}

#define EX_APPENDIX_API(name)					\
	{											\
		EXAPI	ea;								\
		ea.ind = ex_##name##_id_ = ex_id_++;	\
		ea.ex_api = &scanner::handle_ex_##name;	\
		ex_opts_.push_back(ea);					\
	}
	EX_APPENDIX_API(final_compression);
	EX_APPENDIX_API(final_format);
	EX_APPENDIX_API(serial);
	EX_APPENDIX_API(to_be_scan);
	EX_APPENDIX_API(scan_with_hole);
	EX_APPENDIX_API(device_code);
	EX_APPENDIX_API(power);
	EX_APPENDIX_API(hardware_version);
	EX_APPENDIX_API(ip);

	if (black_white_threshold_id_ == -1)
		black_white_threshold_id_ = 0x8836;

	return ret;
}
int scanner::control_read_string(int code, std::string& ret)
{
	char* buf = NULL;
	unsigned len = 0;
	int err = hg_sane_middleware::instance()->io_control(handle_, code, buf, &len);

	ret = "";
	if (err == SANE_STATUS_NO_MEM)
	{
		len += 4;
		buf = new char[len];
		memset(buf, 0, len);
		err = hg_sane_middleware::instance()->io_control(handle_, code, buf, &len);
		if (err == SANE_STATUS_GOOD)
			ret = buf;
		delete[] buf;
	}

	return err;
}

void scanner::extension_none(int id)
{
}
void scanner::extension_multiout_type(int id)
{
	EXAPI	ea;

	ex_multiout_type_id_ = ex_id_++;
	ea.ind = ex_multiout_type_id_;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_multiout;

	ex_opts_.push_back(ea);
}
void scanner::extension_color_mode(int id)
{
	EXAPI	ea;

	ea.ind = ex_color_mode_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_color_mode;
	ex_opts_.push_back(ea);

	ex_auto_color_type_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ind = ex_auto_color_type_id_;
	ea.ex_api = &scanner::handle_ex_auto_color_type;
	ex_opts_.push_back(ea);
}
void scanner::extension_sharpen(int id)
{
	EXAPI	ea;

	ex_sharpen_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ind = ex_sharpen_id_;
	ea.ex_api = &scanner::handle_ex_sharpen;

	ex_opts_.push_back(ea);
}
void scanner::extension_paper(int id)
{
	EXAPI	ea;

	ea.ind = ex_paper_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_paper;
	ex_opts_.push_back(ea);

	ea.ind = ex_paper_lateral_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_paper_lateral;
	ex_opts_.push_back(ea);

	ea.ind = ex_auto_paper_size_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_auto_paper_size;
	ex_opts_.push_back(ea);

	ea.ind = ex_is_paper_auto_crop_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_auto_paper_crop;
	ex_opts_.push_back(ea);
}
void scanner::extension_fill_bkg_method(int id)
{
	EXAPI	ea;

	ea.ind = ex_fill_background_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_fill_background;
	ex_opts_.push_back(ea);
}
void scanner::extension_text_direction(int id)
{
	EXAPI	ea;

	ea.ind = ex_text_direction_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_text_direction;
	ex_opts_.push_back(ea);
}
void scanner::extension_page(int id)
{
	EXAPI	ea;

	ea.ind = ex_duplex_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_duplex;
	ex_opts_.push_back(ea);

	ea.ind = ex_discard_blank_page_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_discard_blank_page;
	ex_opts_.push_back(ea);

	ea.ind = ex_discard_blank_receipt_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_discard_blank_receipt;
	ex_opts_.push_back(ea);

	ea.ind = ex_is_page_fold_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_page_fold;
	ex_opts_.push_back(ea);
}
void scanner::extension_erase_color(int id)
{
	EXAPI	ea;

	ea.ind = ex_color_filter_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_color_filter;
	ex_opts_.push_back(ea);

	ea.ind = ex_color_enhance_id_ = ex_id_++;
	ea.base_ind = id;
	ea.ex_api = &scanner::handle_ex_color_enhance;
	ex_opts_.push_back(ea);
}
bool scanner::get_option_value_with_parent(int sn, set_opt_value setv, void* param)	// return true if handled
{
	bool handled = true;

	if (sn == scan_count_id_)
	{
		SANE_Option_Descriptor* parent = hg_sane_middleware::instance()->get_option_descriptor(handle_, scan_mode_id_);
		char* buf = new char[parent->size + 4];

		memset(buf, 0, parent->size);
		hg_sane_middleware::instance()->get_cur_value(handle_, scan_mode_id_, buf);
		handled = compare_sane_opt(OPTION_VALUE_SMZS_LXSM, buf);
		delete[] buf;
		if (handled)
		{
			int count = -1;
			value_role role = VAL_ROLE_CURRENT;
			buf = (char*)hg_sane_middleware::instance()->get_def_value(handle_, scan_mode_id_);
			if (compare_sane_opt(OPTION_VALUE_SMZS_LXSM, buf))
				role = value_role(role | VAL_ROLE_DEFAULT);
			local_utility::free_memory(buf);

			setv(&count, value_role(VAL_ROLE_CURRENT | VAL_ROLE_DEFAULT), param);
		}
	}
	else
		handled = false;

	return handled;
}
bool scanner::set_option_value_with_parent(int sn, void* data, int* err)	// return true if handled
{
	bool handled = true;

	if (sn == scan_count_id_)
	{
		SANE_Option_Descriptor* parent = hg_sane_middleware::instance()->get_option_descriptor(handle_, scan_mode_id_);
		char*		val = new char[parent->size + 4];
		SANE_Int	after = 0;

		memset(val, 0, parent->size + 4);
		hg_sane_middleware::instance()->get_cur_value(handle_, scan_mode_id_, val);
		if (compare_sane_opt(OPTION_VALUE_SMZS_LXSM, val))
		{
			if (*(int*)data != -1)
			{
				strcpy(val, OPTION_VALUE_SMZS_SMZDZS);
				*err = hg_sane_middleware::instance()->set_option(handle_, scan_mode_id_, SANE_ACTION_SET_VALUE, val, &after);
			}
		}
		else if (*(int*)data == -1)
		{
			strcpy(val, OPTION_VALUE_SMZS_LXSM);
			*err = hg_sane_middleware::instance()->set_option(handle_, scan_mode_id_, SANE_ACTION_SET_VALUE, val, &after);
		}
		handled = false;
	}
	else
	{
		handled = false;
	}

	return handled;
}
int scanner::set_option_value(int sn, SANE_Value_Type type, int size, void* data)
{
	char*		buf = NULL;
	SANE_Bool	sb = SANE_FALSE;
	SANE_Int	si = 0, after = 0;
	SANE_Fixed	sf = 0;
	int			ret = SCANNER_ERR_OK;
	void*		val = data;

	if (type == SANE_TYPE_BOOL)
	{
		sb = *(bool*)data ? SANE_TRUE : SANE_FALSE;
		val = &sb;
	}
	else if (type == SANE_TYPE_INT)
	{
		si = *(int*)data;
		val = &si;
	}
	else if (type == SANE_TYPE_FIXED)
	{
		sf = SANE_FIX(*(float*)data);
		val = &sf;
	}
	else
	{
		buf = new char[size + 4];
		memset(buf, 0, size + 4);
		strcpy(buf, ((std::string*)data)->c_str());
		val = buf;
	}

	ret = hg_sane_middleware::instance()->set_option(handle_, sn, SANE_ACTION_SET_VALUE, val, &after);

	if (type == SANE_TYPE_BOOL)
	{
		*(bool*)data = sb == SANE_TRUE;
	}
	else if (type == SANE_TYPE_INT)
	{
		*(int*)data = si;
	}
	else if (type == SANE_TYPE_FIXED)
	{
		*(float*)data = SANE_UNFIX(sf);
	}
	else if(buf)
	{
		strcpy((char*)val, buf);
		delete[] buf;
	}

	return ret;
}

scanner::EXAPIPOS scanner::find_ex_api(int op_id)
{
	return std::find(ex_opts_.begin(), ex_opts_.end(), op_id);
}

EX_OPTION_HANDLER_IMPL(multiout)
{
	int	ret = SCANNER_ERR_OK;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);

	if (setv)
	{
		char* cur = new char[desc->size],
			* def = (char*)hg_sane_middleware::instance()->get_def_value(handle_, base_id);
		int now = 0,	// sane_opt_trans::multiout_value_to_twain(cur)
			init = sane_opt_trans::multiout_value_to_twain(def),
			val = 0;

		local_utility::free_memory(def);
		memset(cur, 0, desc->size);
		hg_sane_middleware::instance()->get_cur_value(handle_, base_id, cur);
		now = sane_opt_trans::multiout_value_to_twain(cur);
		delete[] cur;

		{
			// parent item ...
			SANE_Bool	enable = SANE_TRUE;
			if (hg_sane_middleware::instance()->get_cur_value(handle_, is_multiout_id_, &enable))
			{
				if (!enable)
					now = MULTI_OUT_NONE;
			}
		}

		do
		{
			if (desc->constraint_type == SANE_CONSTRAINT_STRING_LIST)
			{
				// we have no 'MULTI_OUT_NONE' item in this option, this is used as is_multiout_id_
				val = MULTI_OUT_NONE;
				value_role role = val == now ? VAL_ROLE_CURRENT : VAL_ROLE_NONE;
				if (!setv(&val, role, data))
					break;
				for (int i = 0; desc->constraint.string_list[i]; ++i)
				{
					value_role role = VAL_ROLE_NONE;
					val = sane_opt_trans::multiout_value_to_twain(desc->constraint.string_list[i]);
					if (val == now)
						role = VAL_ROLE_CURRENT;
					if (val == init)
						role = value_role(role | VAL_ROLE_DEFAULT);
					if (!setv(&val, role, data))
						break;
				}
			}
			else
				set_cur_and_def_value<int>(now, init, setv, data);
		} while (0);
	}
	else
	{
		char* val = new char[desc->size];
		const char* in = sane_opt_trans::multiout_value_from_twain(*(int*)data);
		SANE_Int	after = 0;

		if (in && strcmp(in, "\346\227\240"))
		{
			// enable multi-out ...
			*((SANE_Bool*)val) = SANE_TRUE;
			ret = hg_sane_middleware::instance()->set_option(handle_, is_multiout_id_, SANE_ACTION_SET_VALUE, val, &after);
			strcpy(val, in);
		}
		else
		{
			// disable multi-out, let multiout type side 
			base_id = is_multiout_id_;
			*((SANE_Bool*)val) = SANE_FALSE;
		}
		if (ret == SANE_STATUS_GOOD)
			ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, val, &after);
		delete[] val;
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(auto_color_type)
{
	int	ret = SCANNER_ERR_OK;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	int len = desc->size + 4;
	char* buf = new char[len];

	memset(buf, 0, len);
	hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
	if (setv)
	{
		len = sane_opt_trans::auto_color_type_to_twain(buf);
		setv(&len, VAL_ROLE_CURRENT, data);
	}
	else
	{
		SANE_Int	after = 0;

		strcpy(buf, sane_opt_trans::auto_color_type_from_twain(*(int*)data));
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}
	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(color_mode)
{
	int	ret = SCANNER_ERR_OK;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);

	if (setv)
	{
		char* cur = new char[desc->size],
			* def = (char*)hg_sane_middleware::instance()->get_def_value(handle_, base_id);
		int now = 0,	// sane_opt_trans::multiout_value_to_twain(cur)
			init = sane_opt_trans::color_mode_to_twain(def),
			val = 0;

		local_utility::free_memory(def);
		memset(cur, 0, desc->size);
		hg_sane_middleware::instance()->get_cur_value(handle_, base_id, cur);
		now = sane_opt_trans::color_mode_to_twain(cur);
		delete[] cur;

		do
		{
			if (desc->constraint_type == SANE_CONSTRAINT_STRING_LIST)
			{
				for (int i = 0; desc->constraint.string_list[i]; ++i)
				{
					value_role role = VAL_ROLE_NONE;
					val = sane_opt_trans::color_mode_to_twain(desc->constraint.string_list[i]);
					if (val == now)
						role = VAL_ROLE_CURRENT;
					if (val == init)
						role = value_role(role | VAL_ROLE_DEFAULT);
					if (!setv(&val, role, data))
						break;
				}
			}
			else
				set_cur_and_def_value<int>(now, init, setv, data);
		} while (0);
	}
	else
	{
		char* val = new char[desc->size];
		const char* in = sane_opt_trans::color_mode_from_twain(*(int*)data);
		SANE_Int	after = 0;

		strcpy(val, in);
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, val, &after);
		delete[] val;
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(sharpen)
{
	int	ret = SCANNER_ERR_OK;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);

	if (setv)
	{
		char* cur = new char[desc->size],
			* def = (char*)hg_sane_middleware::instance()->get_def_value(handle_, base_id);
		int now = 0,	// sane_opt_trans::multiout_value_to_twain(cur)
			init = sane_opt_trans::sharpen_to_twain(def),
			val = 0;

		local_utility::free_memory(def);
		memset(cur, 0, desc->size);
		hg_sane_middleware::instance()->get_cur_value(handle_, base_id, cur);
		now = sane_opt_trans::sharpen_to_twain(cur);
		delete[] cur;

		do
		{
			if (desc->constraint_type == SANE_CONSTRAINT_STRING_LIST)
			{
				for (int i = 0; desc->constraint.string_list[i]; ++i)
				{
					value_role role = VAL_ROLE_NONE;
					val = sane_opt_trans::sharpen_to_twain(desc->constraint.string_list[i]);
					if (val == now)
						role = VAL_ROLE_CURRENT;
					if (val == init)
						role = value_role(role | VAL_ROLE_DEFAULT);
					if (!setv(&val, role, data))
						break;
				}
			}
			else
				set_cur_and_def_value<int>(now, init, setv, data);
		} while (0);
	}
	else
	{
		char* val = new char[desc->size];
		const char* in = sane_opt_trans::sharpen_from_twain(*(int*)data);
		SANE_Int	after = 0;

		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, val, &after);
		delete[] val;
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(paper)
{
	int	ret = SCANNER_ERR_OK;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	int len = desc->size + 4;
	char* buf = new char[len];

	memset(buf, 0, len);
	if (setv)
	{
		hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
		char* def = (char*)hg_sane_middleware::instance()->get_def_value(handle_, base_id);
		int now = sane_opt_trans::paper_to_twain(buf),
			init = sane_opt_trans::paper_to_twain(def),
			val = 0;
		do
		{
			if (desc->constraint_type == SANE_CONSTRAINT_STRING_LIST)
			{
				for (int i = 0; desc->constraint.string_list[i]; ++i)
				{
					value_role role = VAL_ROLE_NONE;
					val = sane_opt_trans::paper_to_twain(desc->constraint.string_list[i]);
					if (val == -1)
						continue;
					if (val == now)
						role = VAL_ROLE_CURRENT;
					if (val == init)
						role = value_role(role | VAL_ROLE_DEFAULT);
					if (!setv(&val, role, data))
						break;
				}
			}
			else
				set_cur_and_def_value<int>(now, init, setv, data);
		} while (0);
	}
	else if (sane_opt_trans::paper_from_twain(*(int*)data))
	{
		SANE_Int after = 0;
		strcpy(buf, sane_opt_trans::paper_from_twain(*(int*)data));
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
	}
	else
		ret = SCANNER_ERR_INVALID_PARAMETER;

	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(paper_lateral)
{
	int	ret = SCANNER_ERR_OK;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	int len = desc->size + 4;
	char* buf = new char[len];
	const char* lateral_swap = NULL;
	bool lateral = false;

	memset(buf, 0, len);
	hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
	lateral_swap = sane_opt_trans::switch_paper_lateral(buf);
	lateral = sane_opt_trans::is_paper_lateral(buf);
	if (setv)
	{
		setv(&lateral, VAL_ROLE_CURRENT, data);
	}
	else if (lateral_swap)
	{
		SANE_Int after = 0;
		if (lateral != *(bool*)data)
		{
			strcpy(buf, lateral_swap);
			ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
			ret = local_utility::sane_statu_2_scanner_err(ret);
		}
	}
	else
		ret = SCANNER_ERR_DEVICE_NOT_SUPPORT;

	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(auto_paper_size)
{
	int	ret = SCANNER_ERR_OK;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	int len = desc->size + 4;
	char* buf = new char[len];

	memset(buf, 0, len);
	hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
	if (setv)
	{
		bool yes = strcmp(buf, OPTION_VALUE_ZZCC_PPYSCC) == 0;
		setv(&yes, VAL_ROLE_CURRENT, data);
	}
	else
	{
		SANE_Int after = 0;
		strcpy(buf, *(bool*)data ? OPTION_VALUE_ZZCC_PPYSCC : OPTION_VALUE_ZZCC_A4);
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}
	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(auto_paper_crop)
{
	int	ret = SCANNER_ERR_OK;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	int len = desc->size + 4;
	char* buf = new char[len];

	memset(buf, 0, len);
	hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
	if (setv)
	{
		bool yes = strcmp(buf, OPTION_VALUE_ZZCC_ZDSMCCZDCQ) == 0;
		setv(&yes, VAL_ROLE_CURRENT, data);
	}
	else
	{
		SANE_Int after = 0;
		strcpy(buf, *(bool*)data ? OPTION_VALUE_ZZCC_ZDSMCCZDCQ : OPTION_VALUE_ZZCC_ZDSMCC);
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}
	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(text_direction)
{
	int	ret = SCANNER_ERR_OK;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	int len = desc->size + 4;
	char* buf = new char[len];

	memset(buf, 0, len);
	if (setv)
	{
		char* def = (char*)hg_sane_middleware::instance()->get_def_value(handle_, base_id);
		float now = .0f, init = sane_opt_trans::text_direction_to_twain(def), val = .0f;

		local_utility::free_memory(def);
		hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
		now = sane_opt_trans::text_direction_to_twain(buf);
		do
		{
			if (desc->constraint_type == SANE_CONSTRAINT_STRING_LIST)
			{
				for (int i = 0; desc->constraint.string_list[i]; ++i)
				{
					value_role	role = VAL_ROLE_NONE;
					val = sane_opt_trans::text_direction_to_twain(desc->constraint.string_list[i]);
					if (IS_DOUBLE_EQUAL(val, now))
						role = VAL_ROLE_CURRENT;
					if (IS_DOUBLE_EQUAL(val, init))
						role = value_role(role | VAL_ROLE_DEFAULT);
					if (!setv(&val, role, data))
						break;
				}
			}
			else
				set_cur_and_def_value<float>(now, init, setv, data);
		} while (0);
	}
	else
	{
		SANE_Int	after = 0;

		strcpy(buf, sane_opt_trans::text_direction_from_twain(*(float*)data));
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}
	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(duplex)
{
	int	ret = SCANNER_ERR_OK;
	bool val = *(bool*)data;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	unsigned len = desc->size + 4;
	char* buf = new char[len];

	memset(buf, 0, len);
	if (setv)
	{
		void* init = hg_sane_middleware::instance()->get_def_value(handle_, base_id);
		hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
		val = strcmp(buf, OPTION_VALUE_SMYM_SM) == 0;
		if (val && strcmp((char*)init, OPTION_VALUE_SMYM_SM) == 0 ||
			!val && strcmp((char*)init, OPTION_VALUE_SMYM_DM) == 0)
			setv(&val, value_role(VAL_ROLE_CURRENT | VAL_ROLE_DEFAULT), data);
		else if (setv(&val, VAL_ROLE_CURRENT, data))
		{
			if (strcmp((char*)init, OPTION_VALUE_SMYM_SM) == 0)
			{
				val = true;
				setv(&val, VAL_ROLE_DEFAULT, data);
			}
			if (strcmp((char*)init, OPTION_VALUE_SMYM_DM) == 0)
			{
				val = false;
				setv(&val, VAL_ROLE_DEFAULT, data);
			}
		}
	}
	else
	{
		strcpy(buf, val ? OPTION_VALUE_SMYM_SM : OPTION_VALUE_SMYM_DM);
		SANE_Int after = 0;
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}
	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(fill_background)
{
	int	ret = SCANNER_ERR_OK;
	bool val = *(bool*)data;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	unsigned len = desc->size + 4;
	char* buf = new char[len];

	memset(buf, 0, len);
	if (setv)
	{
		char* init = (char*)hg_sane_middleware::instance()->get_def_value(handle_, base_id);
		hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
		val = strcmp(buf, OPTION_VALUE_SMYM_SM) == 0;
		set_cur_and_def_value<bool>(strcmp(buf, OPTION_VALUE_BJTCFS_TDBX) == 0, strcmp(init, OPTION_VALUE_BJTCFS_TDBX) == 0, setv, data);
		local_utility::free_memory(init);
	}
	else
	{
		strcpy(buf, val ? OPTION_VALUE_BJTCFS_TDBX : OPTION_VALUE_BJTCFS_ADBX);
		SANE_Int after = 0;
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}
	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(discard_blank_page)
{
	int	ret = SCANNER_ERR_OK;
	bool val = *(bool*)data;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	unsigned len = desc->size + 4;
	char* buf = new char[len];

	memset(buf, 0, len);
	if (setv)
	{
		hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
		val = strcmp(buf, OPTION_VALUE_SMYM_TGKBYTY) == 0;
		setv(&val, VAL_ROLE_CURRENT, data);
	}
	else
	{
		if (val)
			strcpy(buf, OPTION_VALUE_SMYM_TGKBYTY);
		else
		{
			char* init = (char*)hg_sane_middleware::instance()->get_def_value(handle_, base_id);
			strcpy(buf, init);
			local_utility::free_memory(init);
		}
		SANE_Int after = 0;
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}
	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(discard_blank_receipt)
{
	int	ret = SCANNER_ERR_OK;
	bool val = *(bool*)data;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	unsigned len = desc->size + 4;
	char* buf = new char[len];

	memset(buf, 0, len);
	if (setv)
	{
		hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
		val = strcmp(buf, OPTION_VALUE_SMYM_TGKBYFPZ) == 0;
		setv(&val, VAL_ROLE_CURRENT, data);
	}
	else
	{
		if (val)
			strcpy(buf, OPTION_VALUE_SMYM_TGKBYFPZ);
		else
		{
			char* init = (char*)hg_sane_middleware::instance()->get_def_value(handle_, base_id);
			strcpy(buf, init);
			local_utility::free_memory(init);
		}
		SANE_Int after = 0;
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}
	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(page_fold)
{
	int	ret = SCANNER_ERR_OK;
	bool val = *(bool*)data;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	unsigned len = desc->size + 4;
	char* buf = new char[len];

	memset(buf, 0, len);
	if (setv)
	{
		hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
		val = strcmp(buf, OPTION_VALUE_SMYM_DZ) == 0;
		setv(&val, VAL_ROLE_CURRENT, data);
	}
	else
	{
		if (val)
			strcpy(buf, OPTION_VALUE_SMYM_DZ);
		else
		{
			char* init = (char*)hg_sane_middleware::instance()->get_def_value(handle_, base_id);
			strcpy(buf, init);
			local_utility::free_memory(init);
		}
		SANE_Int after = 0;
		ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}
	delete[] buf;

	return ret;
}
EX_OPTION_HANDLER_IMPL(color_filter)		// int (filter_value)
{
	int	ret = SCANNER_ERR_DEVICE_NOT_SUPPORT;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	char* buf = NULL;
	unsigned int len = 0;

	if (desc)
	{
		len = desc->size + 4;
		buf = new char[len];
		memset(buf, 0, len);
		if (setv)
		{
			bool filter = false;
			int val = FILTER_NONE, now = FILTER_NONE;
			hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
			now = sane_opt_trans::filter_enhance_value_to_twain(buf, &filter);
			if (!filter)
				now = val;
			do
			{
				if (desc->constraint_type == SANE_CONSTRAINT_STRING_LIST)
				{
					for (int i = 0; desc->constraint.string_list[i]; ++i)
					{
						value_role role = VAL_ROLE_NONE;
						int v = sane_opt_trans::filter_enhance_value_to_twain(desc->constraint.string_list[i], &filter);
						if (!filter && v != FILTER_NONE)
							continue;
						if (v == now)
							role = VAL_ROLE_CURRENT;
						if (v == val)
							role = value_role(role | VAL_ROLE_DEFAULT);
						if (!setv(&v, role, data))
							break;
					}
				}
			}while (0);
		}
		else
		{
			const char* val = sane_opt_trans::filter_enhance_value_from_twain(*((int*)data), true);
			SANE_Int	after = 0;

			strcpy(buf, val);
			ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
			ret = local_utility::sane_statu_2_scanner_err(ret);
		}
		delete[] buf;
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(color_enhance)		// int (enhance_value)
{
	int	ret = SCANNER_ERR_DEVICE_NOT_SUPPORT;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, base_id);
	char* buf = NULL;
	unsigned int len = 0;

	if (desc)
	{
		len = desc->size + 4;
		buf = new char[len];
		memset(buf, 0, len);
		if (setv)
		{
			bool filter = false;
			int val = ENHANCE_NONE, now = ENHANCE_NONE;
			hg_sane_middleware::instance()->get_cur_value(handle_, base_id, buf);
			now = sane_opt_trans::filter_enhance_value_to_twain(buf, &filter);
			if (filter)
				now = val;
			do
			{
				if (desc->constraint_type == SANE_CONSTRAINT_STRING_LIST)
				{
					for (int i = 0; desc->constraint.string_list[i]; ++i)
					{
						value_role role = VAL_ROLE_NONE;
						int v = sane_opt_trans::filter_enhance_value_to_twain(desc->constraint.string_list[i], &filter);
						if (filter && v != ENHANCE_NONE)
							continue;
						if (v == now)
							role = VAL_ROLE_CURRENT;
						if (v == val)
							role = value_role(role | VAL_ROLE_DEFAULT);
						if (!setv(&v, role, data))
							break;
					}
				}
			} while (0);
		}
		else
		{
			const char* val = sane_opt_trans::filter_enhance_value_from_twain(*((int*)data), false);
			SANE_Int	after = 0;

			strcpy(buf, val);
			ret = hg_sane_middleware::instance()->set_option(handle_, base_id, SANE_ACTION_SET_VALUE, buf, &after);
			ret = local_utility::sane_statu_2_scanner_err(ret);
		}
		delete[] buf;
	}

	return ret;
}

EX_OPTION_HANDLER_IMPL(final_compression)
{
	int				ret = SCANNER_ERR_OK;
	int*			compression = (int*)data;
	unsigned int	len = sizeof(*compression);

	if (setv)
	{
		int val = 0;
		ret = hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_GET_FINAL_COMPRESSION, &val, &len);
		if (ret == SANE_STATUS_GOOD)
		{
			int i = SANE_COMPRESSION_FIRST;
			for (; i < SANE_COMPRESSION_LAST; ++i)
			{
				value_role role = VAL_ROLE_NONE;
				if (i == val)
					role = VAL_ROLE_CURRENT;
				if (i == SANE_COMPRESSION_NONE)
					role = value_role(role | VAL_ROLE_DEFAULT);
				int v = sane_opt_trans::compression_to_twain(i);
				if (!setv(&v, role, data))
					break;
			}
		}
	}
	else
	{
		int val = sane_opt_trans::compression_from_twain(*(int*)data);
		len = sizeof(val);
		ret = hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_SET_FINAL_COMPRESSION, &val, &len);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(final_format)
{
	int					ret = SCANNER_ERR_OK;
	SANE_FinalImgFormat	ff;
	unsigned int		len = sizeof(ff);

	if (setv)
	{
		ret = hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_GET_FINAL_IMAGE_FORMAT, &ff, &len);
		if (ret == SANE_STATUS_GOOD)
		{
			int now = ff.img_format, init = SANE_IMAGE_TYPE_BMP;
			std::vector<int>	all(sane_opt_trans::support_image_types());
			for (int i = 0; i < all.size(); ++i)
			{
				value_role role = VAL_ROLE_NONE;
				ff.img_format = (SANE_ImageType)all[i];
				if (ff.img_format == now)
					role = VAL_ROLE_CURRENT;
				if (ff.img_format == init)
					role = value_role(role | VAL_ROLE_DEFAULT);
				if (!setv(&ff, role, data))
					break;
			}
		}
	}
	else
	{
		ret = hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_SET_FINAL_IMAGE_FORMAT, data, &len);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(serial)
{
	int ret = SCANNER_ERR_INVALID_PARAMETER;
	if (setv)
	{
		std::string val("");

		ret = control_read_string(IO_CTRL_CODE_GET_SERIAL, val);
		if (ret == SANE_STATUS_GOOD)
			setv(&val, VAL_ROLE_CURRENT, data);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(to_be_scan)
{
	int ret = SCANNER_ERR_OK;
	SANE_Bool	wait_paper = SANE_FALSE;
	unsigned int len = sizeof(wait_paper);

	if (setv)
	{
		ret = hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_GET_SCAN_WHEN_PAPER_ON, &wait_paper, &len);
		if (ret == SANE_STATUS_GOOD)
		{
			bool val = wait_paper == SANE_TRUE;
			setv(&val, VAL_ROLE_CURRENT, data);
		}
	}
	else
	{
		wait_paper = *((bool*)data) ? SANE_TRUE : SANE_FALSE;
		ret = hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_SET_SCAN_WHEN_PAPER_ON, &wait_paper, &len);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(scan_with_hole)
{
	int ret = SCANNER_ERR_OK;
	SANE_Bool	with_hole = SANE_FALSE;
	unsigned int len = sizeof(with_hole);

	if (setv)
	{
		ret = hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_GET_SCAN_WITH_HOLE, &with_hole, &len);
		if (ret == SANE_STATUS_GOOD)
		{
			bool val = with_hole == SANE_TRUE;
			setv(&val, VAL_ROLE_CURRENT, data);
		}
	}
	else
	{
		with_hole = *((bool*)data) ? SANE_TRUE : SANE_FALSE;
		ret = hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_SET_SCAN_WITH_HOLE, &with_hole, &len);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(device_code)
{
	int ret = SCANNER_ERR_INVALID_PARAMETER;
	if (setv)
	{
		std::string val("");

		ret = control_read_string(IO_CTRL_CODE_GET_DEVICE_CODE, val);
		if (ret == SANE_STATUS_GOOD)
			setv(&val, VAL_ROLE_CURRENT, data);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(power)
{
	int ret = SCANNER_ERR_OK;

	if (setv)
	{
		SANE_Power now = SANE_POWER_MINUTES_30, init = SANE_POWER_MINUTES_30;
		unsigned int len = sizeof(now);

		hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_GET_POWER_LEVEL, &now, &len);
		for (int i = SANE_POWER_FIRST; i < SANE_POWER_LAST; ++i)
		{
			value_role	role = VAL_ROLE_NONE;
			if (i == now)
				role = VAL_ROLE_CURRENT;
			if (i == init)
				role = value_role(role | VAL_ROLE_DEFAULT);

			SANE_Power power = (SANE_Power)i;
			if (!setv(&power, role, data))
				break;
		}
	}
	else
	{
		SANE_Power power = *((SANE_Power*)data);
		unsigned int len = sizeof(power);
		ret = hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_SET_POWER_LEVEL, &power, &len);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(hardware_version)
{
	int ret = SCANNER_ERR_INVALID_PARAMETER;
	if (setv)
	{
		std::string val("");

		ret = control_read_string(IO_CTRL_CODE_GET_HARDWARE_VERSION, val);
		if (ret == SANE_STATUS_GOOD)
			setv(&val, VAL_ROLE_CURRENT, data);
	}

	return ret;
}
EX_OPTION_HANDLER_IMPL(ip)
{
	int ret = SCANNER_ERR_INVALID_PARAMETER;
	if (setv)
	{
		std::string val("");

		ret = control_read_string(IO_CTRL_CODE_GET_IP, val);
		if (ret == SANE_STATUS_GOOD)
			setv(&val, VAL_ROLE_CURRENT, data);
	}

	return ret;
}

// ISaneInvoker
COM_API_IMPLEMENT(scanner, int, start(void))
{
	int ret = SANE_STATUS_GOOD;

	scan_msg_ = "OK";
	scan_err_ = false;
	hg_sane_middleware::instance()->start(handle_, NULL);

	// the third-APPs in linux will call 'stop' after every start, but it not happens in windows-apps, so we handle this as following ...
	if(ret == SANE_STATUS_NO_DOCS && prev_start_result_ == SANE_STATUS_GOOD)
		ret = hg_sane_middleware::instance()->start(handle_, NULL);

	if (ret == SANE_STATUS_GOOD)
	{
		unsigned int l = sizeof(img_fmt_);
		SANE_CompressionType cmprsn = img_fmt_.compress.compression;
		if (hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_GET_FINAL_IMAGE_FORMAT, &img_fmt_, &l))
			img_fmt_.img_format = SANE_IMAGE_TYPE_BMP;
		img_fmt_.compress.compression = cmprsn;
		working_ = true;
	}
	prev_start_result_ = ret;

	return local_utility::sane_statu_2_scanner_err(ret);
}
COM_API_IMPLEMENT(scanner, int, stop(void))
{
	working_ = false;
	return hg_sane_middleware::instance()->stop(handle_);
}
COM_API_IMPLEMENT(scanner, void, set_event_callback(void(*cb)(int ev_type, void* data, unsigned int* len, void* param), void* param))
{
	cb_invoker_ = cb;
	cb_param_ = param;
}
COM_API_IMPLEMENT(scanner, bool, wait_image(DWORD milliseconds))
{
	int count = get_scanned_images(milliseconds);

	return count > 0;
}
COM_API_IMPLEMENT(scanner, int, get_scanned_images(DWORD milliseconds))
{
	size_t count = images_.count();
	bool	notify = true;

	while (count == 0 && milliseconds)
	{
		MSG msg = { 0 };
		if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
		{
			TranslateMessage(&msg);
			DispatchMessageW(&msg);
		}
		Sleep(10);
		if (!working_)
		{
			if (notify && indicator_.get())
			{
				notify = false;
				indicator_->notify_scan_over(scan_msg_.c_str(), scan_err_);	// Ending by UI
			}
			else if(ui_quit_)
				break;
		}
		count = images_.count();
		if (milliseconds != -1)
		{
			if (milliseconds <= 10)
				break;

			milliseconds -= 10;
		}
	}

	return count;
}
COM_API_IMPLEMENT(scanner, IScanImg*, take_first_image(twain_xfer xfer))
{
	scanned_img* img = images_.take();

	return dynamic_cast<IScanImg*>(img);
}
COM_API_IMPLEMENT(scanner, bool, get_first_image_header(SANE_Parameters* header, size_t* bytes))
{
	return images_.get_header(header, bytes);
}
COM_API_IMPLEMENT(scanner, bool, is_online(void))
{
	return !scanner::get_scanner_name(id_).empty();
}
COM_API_IMPLEMENT(scanner, bool, is_paper_on(void))
{
	SANE_Bool on = SANE_FALSE;
	unsigned int len = sizeof(on);

	if (hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_GET_PAPER_ON, &on, &len) == SANE_STATUS_GOOD)
		return on == SANE_TRUE;
	else
		return false;
}
COM_API_IMPLEMENT(scanner, bool, get_option_info(int sn, value_type* type, value_limit* limit, int* bytes))
{
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, sn);
	bool ret = false;

	if (desc)
	{
		if (type)
			*type = scanner::from_sane_type(desc->type);
		if (limit)
			*limit = scanner::from_sane_constraint(desc->constraint_type);
		if (bytes)
			*bytes = desc->size;

		ret = true;
	}

	return ret;
}
COM_API_IMPLEMENT(scanner, bool, get_value(int sn, set_opt_value setval, void* param))
{
	EXAPIPOS	ex = find_ex_api(sn);
	int			ret = SANE_STATUS_INVAL;
	SANE_Int	after = 0;

	if (ex == ex_opts_.end())
	{
		if (get_option_value_with_parent(sn, setval, param))
			return true;

		SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, sn);
		void* init = hg_sane_middleware::instance()->get_def_value(handle_, sn);
		ret = SANE_STATUS_GOOD;
		if (desc->type == SANE_TYPE_BOOL)
		{
			SANE_Bool v = SANE_FALSE;
			bool val = false;

			hg_sane_middleware::instance()->get_cur_value(handle_, sn, &v);
			val = v == SANE_TRUE;
			set_cur_and_def_value<bool>(val, *(SANE_Bool*)init == SANE_TRUE, setval, param);
		}
		else if (desc->type == SANE_TYPE_INT)
		{
			SANE_Int cur = 0, def = *(SANE_Int*)init;
			int		val = 0;

			hg_sane_middleware::instance()->get_cur_value(handle_, sn, &cur);
			val = cur;
			if (sn == resolution_id_)
				dpi_ = cur;
			do
			{
				if (desc->constraint_type == SANE_CONSTRAINT_RANGE)
				{
					set_value_range<SANE_Int, int>(cur, def, desc->constraint.range->min, desc->constraint.range->max, desc->constraint.range->quant, setval, param, scanner::to_int);
				}
				else if (desc->constraint_type == SANE_CONSTRAINT_WORD_LIST)
				{
					const SANE_Word* v = desc->constraint.word_list;
					for (int i = 0; i < v[0]; ++i)
					{
						value_role role = VAL_ROLE_NONE;
						if (v[i + 1] == cur)
							role = value_role(role | VAL_ROLE_CURRENT);
						if (v[i + 1] == *(SANE_Int*)init)
							role = value_role(role | VAL_ROLE_DEFAULT);
						val = v[i + 1];
						if (!setval(&val, role, param))
							break;
					}
				}
				else
					set_cur_and_def_value<int>(val, *(SANE_Int*)init, setval, param);

			}while (0);
		}
		else if (desc->type == SANE_TYPE_FIXED)
		{
			SANE_Fixed cur = 0, def = *(SANE_Fixed*)init;
			float	val = .0f;

			hg_sane_middleware::instance()->get_cur_value(handle_, sn, &cur);
			if (sn == resolution_id_)
				dpi_ = SANE_UNFIX(cur) + .5f;
			do
			{
				if (desc->constraint_type == SANE_CONSTRAINT_RANGE)
				{
					set_value_range<SANE_Fixed, float>(cur, def, desc->constraint.range->min, desc->constraint.range->max, desc->constraint.range->quant, setval, param, scanner::to_float);
				}
				else if (desc->constraint_type == SANE_CONSTRAINT_WORD_LIST)
				{
					const SANE_Word* v = desc->constraint.word_list;
					for (int i = 0; i < v[0]; ++i)
					{
						value_role role = VAL_ROLE_NONE;
						if (v[i + 1] == cur)
							role = value_role(role | VAL_ROLE_CURRENT);
						if (v[i + 1] == def)
							role = value_role(role | VAL_ROLE_DEFAULT);
						val = SANE_UNFIX(v[i + 1]);
						if (!setval(&val, role, param))
							break;
					}
				}
				else
					set_cur_and_def_value<float>(val, SANE_UNFIX(*(SANE_Fixed*)init), setval, param);
			} while (0);
		}
		else if (desc->type == SANE_TYPE_STRING)
		{
			char* buf = new char[desc->size + 4];
			std::string val(""), def((char*)init);

			memset(buf, 0, desc->size + 4);
			hg_sane_middleware::instance()->get_cur_value(handle_, sn, buf);
			val = buf;
			do
			{
				if (desc->constraint_type == SANE_CONSTRAINT_STRING_LIST)
				{
					for (int i = 0; desc->constraint.string_list[i]; ++i)
					{
						value_role role = VAL_ROLE_NONE;
						if (strcmp(desc->constraint.string_list[i], buf) == 0)
							role = value_role(role | VAL_ROLE_CURRENT);
						if (strcmp(desc->constraint.string_list[i], (char*)init) == 0)
							role = value_role(role | VAL_ROLE_DEFAULT);

						val = desc->constraint.string_list[i];
						if (!setval(&val, role, param))
							break;
					}
				}
				else
					set_cur_and_def_value<std::string>(val, def, setval, param);
			} while (0);
			delete[] buf;
		}
		else
		{
			ret = SANE_STATUS_INVAL;
		}
		local_utility::free_memory(init);
	}
	else
	{
		ret = (this->*ex->ex_api)(ex->base_ind, param, setval);
	}

	return ret == SANE_STATUS_GOOD;
}
COM_API_IMPLEMENT(scanner, int, set_value(int sn, void* val))
{
	EXAPIPOS	ex = find_ex_api(sn);
	int			ret = SANE_STATUS_INVAL;
	SANE_Int	after = 0;
	SANE_Option_Descriptor* desc = hg_sane_middleware::instance()->get_option_descriptor(handle_, sn);

	if (ex == ex_opts_.end())
	{
		if (!set_option_value_with_parent(sn, val, &ret))
			ret = set_option_value(sn, desc->type, desc->size, val);
		ret = local_utility::sane_statu_2_scanner_err(ret);
	}
	else
	{
		ret = (this->*ex->ex_api)(ex->base_ind, val, NULL);
	}

	if (sn == resolution_id_)
	{
		if (desc->type == SANE_TYPE_FIXED)
			dpi_ = *(float*)val + .5f;
		else
			dpi_ = *(int*)val;
	}

	return ret;
}
COM_API_IMPLEMENT(scanner, int, convert_image(SANE_ImageFormatConvert* conv))
{
	return hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_CONVERT_IMAGE_FORMAT, conv, NULL);
}
COM_API_IMPLEMENT(scanner, void, free_buffer(void* buf, int len))
{
	hg_sane_middleware::instance()->io_control(handle_, IO_CTRL_CODE_FREE_MEMORY, buf, (unsigned int*)&len);
}

// SANE options ID ...
SANE_OPTION_ID_IMPLEMENT(is_multiout)
SANE_OPTION_ID_IMPLEMENT(multiout_type)
SANE_OPTION_ID_IMPLEMENT(color_mode)
SANE_OPTION_ID_IMPLEMENT(erase_color)
SANE_OPTION_ID_IMPLEMENT(erase_multiout_red)
SANE_OPTION_ID_IMPLEMENT(erase_paper_red)
SANE_OPTION_ID_IMPLEMENT(is_erase_background)
SANE_OPTION_ID_IMPLEMENT(background_color_range)
SANE_OPTION_ID_IMPLEMENT(sharpen)
SANE_OPTION_ID_IMPLEMENT(erase_morr)
SANE_OPTION_ID_IMPLEMENT(erase_grids)
SANE_OPTION_ID_IMPLEMENT(error_extend)
SANE_OPTION_ID_IMPLEMENT(is_noise_modify)
SANE_OPTION_ID_IMPLEMENT(noise_threshold)
SANE_OPTION_ID_IMPLEMENT(paper)
SANE_OPTION_ID_IMPLEMENT(is_custom_area)
SANE_OPTION_ID_IMPLEMENT(curstom_area_l)
SANE_OPTION_ID_IMPLEMENT(curstom_area_r)
SANE_OPTION_ID_IMPLEMENT(curstom_area_t)
SANE_OPTION_ID_IMPLEMENT(curstom_area_b)
SANE_OPTION_ID_IMPLEMENT(is_size_check)
SANE_OPTION_ID_IMPLEMENT(page)
SANE_OPTION_ID_IMPLEMENT(blank_page_threshold)
SANE_OPTION_ID_IMPLEMENT(resolution)
SANE_OPTION_ID_IMPLEMENT(image_quality)
SANE_OPTION_ID_IMPLEMENT(is_swap)
SANE_OPTION_ID_IMPLEMENT(is_split)
SANE_OPTION_ID_IMPLEMENT(is_auto_deskew)
SANE_OPTION_ID_IMPLEMENT(is_custom_gamma)
SANE_OPTION_ID_IMPLEMENT(bright)
SANE_OPTION_ID_IMPLEMENT(contrast)
SANE_OPTION_ID_IMPLEMENT(gamma)
SANE_OPTION_ID_IMPLEMENT(is_erase_black_frame)
SANE_OPTION_ID_IMPLEMENT(deep_sample)
SANE_OPTION_ID_IMPLEMENT(threshold)
SANE_OPTION_ID_IMPLEMENT(anti_noise)
SANE_OPTION_ID_IMPLEMENT(margin)
SANE_OPTION_ID_IMPLEMENT(fill_background)
SANE_OPTION_ID_IMPLEMENT(is_anti_permeate)
SANE_OPTION_ID_IMPLEMENT(anti_permeate_level)
SANE_OPTION_ID_IMPLEMENT(is_erase_hole)
SANE_OPTION_ID_IMPLEMENT(search_hole_range)
SANE_OPTION_ID_IMPLEMENT(is_filling_color)
SANE_OPTION_ID_IMPLEMENT(is_ultrasonic_check)
SANE_OPTION_ID_IMPLEMENT(is_check_staple)
SANE_OPTION_ID_IMPLEMENT(scan_mode)
SANE_OPTION_ID_IMPLEMENT(scan_count)
SANE_OPTION_ID_IMPLEMENT(text_direction)
SANE_OPTION_ID_IMPLEMENT(is_rotate_bkg180)
SANE_OPTION_ID_IMPLEMENT(is_check_dogear)
SANE_OPTION_ID_IMPLEMENT(dogear_size)
SANE_OPTION_ID_IMPLEMENT(is_check_skew)
SANE_OPTION_ID_IMPLEMENT(skew_range)
SANE_OPTION_ID_IMPLEMENT(black_white_threshold)

// SANE-ex option ID:
SANE_OPTION_ID_IMPLEMENT(ex_multiout_type)
SANE_OPTION_ID_IMPLEMENT(ex_auto_color_type)
SANE_OPTION_ID_IMPLEMENT(ex_color_mode)
SANE_OPTION_ID_IMPLEMENT(ex_sharpen)
SANE_OPTION_ID_IMPLEMENT(ex_paper)
SANE_OPTION_ID_IMPLEMENT(ex_paper_lateral)
SANE_OPTION_ID_IMPLEMENT(ex_auto_paper_size)
SANE_OPTION_ID_IMPLEMENT(ex_is_paper_auto_crop)
SANE_OPTION_ID_IMPLEMENT(ex_text_direction)
SANE_OPTION_ID_IMPLEMENT(ex_duplex)
SANE_OPTION_ID_IMPLEMENT(ex_fill_background)
SANE_OPTION_ID_IMPLEMENT(ex_discard_blank_page)
SANE_OPTION_ID_IMPLEMENT(ex_discard_blank_receipt)
SANE_OPTION_ID_IMPLEMENT(ex_is_page_fold)
SANE_OPTION_ID_IMPLEMENT(ex_color_filter)
SANE_OPTION_ID_IMPLEMENT(ex_color_enhance)
SANE_OPTION_ID_IMPLEMENT(ex_final_compression)
SANE_OPTION_ID_IMPLEMENT(ex_final_format)
SANE_OPTION_ID_IMPLEMENT(ex_serial)
SANE_OPTION_ID_IMPLEMENT(ex_to_be_scan)
SANE_OPTION_ID_IMPLEMENT(ex_scan_with_hole)
SANE_OPTION_ID_IMPLEMENT(ex_device_code)
SANE_OPTION_ID_IMPLEMENT(ex_power)
SANE_OPTION_ID_IMPLEMENT(ex_hardware_version)
SANE_OPTION_ID_IMPLEMENT(ex_ip)

COM_API_IMPLEMENT(scanner, void, twain_set_transfer(twain_xfer xfer))
{
	xfer_ = xfer;
}
COM_API_IMPLEMENT(scanner, void, twain_set_compression(SANE_CompressionType compression, void* detail))
{
	img_fmt_.compress.compression = compression;
	img_fmt_.compress.detail = detail;
}


// ui ...
COM_API_IMPLEMENT(scanner, bool, ui_show_main(HWND parent))
{
	return false;
}
COM_API_IMPLEMENT(scanner, bool, ui_show_setting(HWND parent, bool with_scan))
{
	SANEAPI	api = { NULL };

	api.sane_cancel_api = inner_sane_cancel;
	api.sane_close_api = inner_sane_close;
	api.sane_control_option_api = inner_sane_control_option;
	api.sane_get_devices_api = inner_sane_get_devices;
	api.sane_get_option_descriptor_api = inner_sane_get_option_descriptor;
	api.sane_get_parameters_api = inner_sane_get_parameters;
	api.sane_get_select_fd_api = inner_sane_get_select_fd;
	api.sane_io_control_api = inner_sane_io_control;
	api.sane_open_api = inner_sane_open;
	api.sane_read_api = inner_sane_read;
	api.sane_set_io_mode_api = inner_sane_set_io_mode;
	api.sane_start_api = inner_sane_start;
	api.sane_strstatus_api = inner_sane_strstatus;

	setting_.reset(new dlg_setting(parent, &api, handle_, with_scan, scanner_name_.c_str()));
	setting_->set_ui_event_notify(&scanner::ui_callback, this);
	if (with_scan)
	{
		indicator_.reset(new dlg_indicator(parent));
		indicator_->set_ui_event_notify(&scanner::ui_callback, this);
	}
	else
		indicator_.reset();
	setting_->show();
	ui_quit_ = false;

	return true;
}
COM_API_IMPLEMENT(scanner, bool, ui_show_progress(HWND parent))
{
	indicator_.reset(new dlg_indicator(parent));
	indicator_->set_ui_event_notify(&scanner::ui_callback, this);
	indicator_->show();
	ui_quit_ = false;

	return true;
}
COM_API_IMPLEMENT(scanner, void, ui_hide(void))
{
	if (indicator_.get())
		indicator_.reset();
	if (setting_.get())
		setting_.reset();
}
COM_API_IMPLEMENT(scanner, bool, ui_is_ok(void))
{
	return true;
}




int scanner::handle_event(int ev_code, void* data, unsigned int* len)
{
	if (ev_code == SANE_EVENT_IMAGE_OK)
	{
		SANE_Image* simg = (SANE_Image*)data;
		scanned_img* img = NULL;
		wchar_t	name[40] = { 0 };

		swprintf_s(name, _countof(name) - 1, L"img_%05u.bmp", ++img_ind_);
		img = new scanned_img(handle_, simg->header, simg->data, simg->bytes, dpi_, (tmp_path_ + name).c_str(), xfer_, &img_fmt_);
		if (img->bytes() /*>= simg->bytes*/)
		{
			images_.save(img);
		}
		else
		{
			img->release();
		}
		if (indicator_)
			indicator_->notify_data_arrived(true);
	}
	else if (ev_code == SANE_EVENT_USB_DATA_RECEIVED)
	{
		if (indicator_)
			indicator_->notify_data_arrived(false);
	}
	else if (ev_code == SANE_EVENT_SCAN_FINISHED)
	{
		if (indicator_.get())
		{
			scan_msg_ = (char*)data;
			scan_err_ = *len != SCANNER_ERR_OK;
		}
		working_ = false;
	}

	return 0;
}
















//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// exports 
#ifdef EXPORT_SANE_API
__declspec(dllexport)
#else
__declspec(dllimport)
#endif
int __stdcall initialize(void* reserve)
{
	hg_sane_middleware::set_callback(callback::sane_event_callback, NULL);
	hg_sane_middleware::instance();

	return SANE_STATUS_GOOD;
}
#ifdef EXPORT_SANE_API
__declspec(dllexport)
#else
__declspec(dllimport)
#endif
int __stdcall open_scanner(SCANNERID scanner_id, ISaneInvoker** invoker)
{
	if (!invoker)
		return SCANNER_ERR_INVALID_PARAMETER;

	if (!is_scanner_online(scanner_id))
		return SCANNER_ERR_DEVICE_NOT_FOUND;

	scanner* scn = new scanner(scanner_id);
	*invoker = dynamic_cast<ISaneInvoker*>(scn);

	return 0;
}
#ifdef EXPORT_SANE_API
__declspec(dllexport)
#else
__declspec(dllimport)
#endif
bool __stdcall is_scanner_online(SCANNERID scanner_id)
{
	return !scanner::get_scanner_name(scanner_id).empty();
}
#ifdef EXPORT_SANE_API
__declspec(dllexport)
#else
__declspec(dllimport)
#endif
int __stdcall uninitialize(void* reserve)
{
	hg_sane_middleware::set_callback(NULL, NULL);
	hg_sane_middleware::clear();

	return 0;
}