support string descriptor

device/win_usb/win_usb.cpp

@@ -73,6 +73,20 @@ std::wstring ansi2unicode(const char* ansi, UINT cp = CP_ACP)
 
     return unic;
 }
+std::string unicode2ansi(const wchar_t* unic, UINT cp = CP_ACP)
+{
+    int     len = WideCharToMultiByte(cp, 0, unic, lstrlenW(unic), NULL, 0, NULL, NULL);
+    char    *buf = new char[len + 4];
+
+    memset(buf, 0, len + 4);
+    len = WideCharToMultiByte(cp, 0, unic, lstrlenW(unic), buf, len, NULL, NULL);
+    buf[len--] = 0;
+
+    std::string ansi(buf);
+    delete[] buf;
+
+    return ansi;
+}
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 // OVERLAPPED ...
 ovl_cls::ovl_cls(uint32_t type) : ref_(1), io_bytes_(0), type_(type)
@@ -387,6 +401,16 @@ bool usb_device::init(void)
             COPY_MEMBER(dev_desc_, &info->ConnectionInfo->DeviceDescriptor, iSerialNumber);
             COPY_MEMBER(dev_desc_, &info->ConnectionInfo->DeviceDescriptor, bNumConfigurations);
         }
+        PSTRING_DESCRIPTOR_NODE strdesc = info->StringDescs;
+        while (strdesc)
+        {
+            STRCFG  sc;
+            sc.id = strdesc->DescriptorIndex;
+            sc.val = strdesc->StringDescriptor ? unicode2ansi(strdesc->StringDescriptor->bString) : "";
+            str_cfg_.push_back(sc);
+
+            strdesc = strdesc->Next;
+        }
         if (info->ConfigDesc)
         {
             libusb_config_descriptor* desc = NULL;
@@ -469,6 +493,7 @@ void usb_device::clear(void)
 {
     close();
 
+    str_cfg_.clear();
     if (dev_desc_)
         delete dev_desc_;
     dev_desc_ = NULL;
@@ -534,6 +559,23 @@ int usb_device::get_config_descriptor(int index, libusb_config_descriptor** desc
 
 	return LIBUSB_SUCCESS;
 }
+int usb_device::get_config_string(uint8_t desc_index, unsigned char* data, int length)
+{
+    for (auto& v : str_cfg_)
+    {
+        if (v.id == desc_index)
+        {
+            if (length < v.val.length())
+                memcpy(data, v.val.c_str(), length);
+            else
+                strcpy((char*)data, v.val.c_str());
+
+            return LIBUSB_SUCCESS;
+        }
+    }
+
+    return LIBUSB_ERROR_NOT_FOUND;
+}
 int usb_device::open(libusb_device_handle** dev_handle)
 {
     if (handle_)
@@ -1249,6 +1291,7 @@ void usb_monitor::quit(void)
         std::lock_guard<std::mutex> lock(lock_);
         for (auto& v : devices_)
             v->release();
+        devices_.clear();
     }
 }
 
@@ -1503,3 +1546,8 @@ int LIBUSB_CALL libusb_cancel_transfer(struct libusb_transfer* transfer/*in wind
 {
     return ((usb_device*)transfer)->cancel_io();
 }
+int LIBUSB_CALL libusb_get_string_descriptor_ascii(libusb_device_handle* dev_handle,
+    uint8_t desc_index, unsigned char* data, int length)
+{
+    return ((usb_device*)dev_handle)->get_config_string(desc_index, data, length);
+}

device/win_usb/win_usb.h

@@ -104,6 +104,13 @@ class usb_device	//	consider as libusb_device
 	libusb_device_descriptor				*dev_desc_;
 	std::vector<libusb_config_descriptor*>	cfg_desc_;
 
+	typedef struct _str_cfg
+	{
+		int			id;
+		std::string	val;
+	}STRCFG;
+	std::vector<STRCFG>	str_cfg_;
+
 	typedef struct _usb_pipe
 	{
 		UCHAR	address;
@@ -149,6 +156,7 @@ public:
 	void clear(void);
 	int get_descriptor(libusb_device_descriptor* desc);
 	int get_config_descriptor(int index, libusb_config_descriptor** desc);
+	int get_config_string(uint8_t desc_index, unsigned char* data, int length);
 	int open(libusb_device_handle** dev_handle);
 	int close(void);
 	int set_timeout(unsigned milliseconds);