调整notifyXferReady通知时机：有图时再通知。防止部分APP通知后又无图的情况下，imgInfoGet返回错误也不能退出取图流程的问题

sane/DlgPage.cpp

@@ -796,12 +796,12 @@ dlg_page::dlg_page(HWND parent, const wchar_t* name
 				, vsb_(false), hsb_(false)
 {
 	del_at_destroy_ = true;
-	create();
-	tips_wnd_.create(hwnd());
 
 	size_.cx = size_.cy = 0;
 	pos_.x = 12;
 	pos_.y = 15;
+	create();
+	tips_wnd_.create(hwnd());
 }
 dlg_page::~dlg_page()
 {

sane/scanner.cpp

@@ -1626,6 +1626,7 @@ int scanner::thread_start(void)
 	{
 		// display error message on progress UI, may be closed immediately by APP, so we hide progress UI and call message_box ...
 		// 
+		err_ = ret;
 #ifdef START_SCAN_IN_THREAD
 		if (callback::show_progress_ui && is_bIndicator && ui_notify)
 		{
@@ -3654,6 +3655,10 @@ int scanner::handle_device_event(int ev_code, void* data, unsigned int* len)
 		else if (ui_notify)
 			ui_notify(ev_code, data, img_ind_);
 
+		// notifyXferReady 改为有图片才通知，防止部分APP在imgGetInfo中返回错误不能退出的问题 - 22023-10-25
+		if (img_ind_ == 1)
+			on_ui_event(SANE_EVENT_TWAIN_XFER_READY, nullptr);
+
 		{
 			wchar_t	msg[128] = { 0 };
 			swprintf_s(msg, _countof(msg) - 1, L"New image(%u) received with %u bytes\r\n", img_ind_, simg->bytes);

twain/twain/huagaods.cpp

@@ -3859,10 +3859,13 @@ int huagao_ds::handle_scanner_event(int ev, bool from_event_proc)
 				load_sane_util::log_info(msg, 1);
 			}
 		}
-		else
-		{
-			notifyXferReady();	// scan from UI, should notify this state mannually
-		}
+		//else
+		//{
+		//	notifyXferReady();	// scan from UI, should notify this state mannually - move to sole event SANE_EVENT_TWAIN_XFER_READY
+		//}
+		break;
+	case SANE_EVENT_TWAIN_XFER_READY:
+		notifyXferReady();
 		break;
 	}