清空图像队列，放到启动扫描之前

hgdriver/hgdev/hg_scanner.cpp

@@ -1121,9 +1121,9 @@ void hg_scanner::working_begin(void*)
 }
 void hg_scanner::working_done(void*)
 {
-	imgs_.Clear();
-	if(user_cancel_)
-		final_imgs_.clear();
+//	imgs_.Clear();          // do before start ...
+//	if(user_cancel_)
+//		final_imgs_.clear();
 
 	if (status_ == SCANNER_ERR_OK && stop_fatal_)
 		status_ = stop_fatal_;

hgdriver/hgdev/hg_scanner_200.cpp

@@ -277,6 +277,8 @@ int hg_scanner_200::start(void)
 
 	//discard_prev();
 	user_cancel_ = false;
+        imgs_.Clear();          // move from scanning done
+        final_imgs_.clear();	// move from scanning done
 	ret = writedown_device_configuration(true);
 	if (ret == SCANNER_ERR_OK)
 		writedown_image_configuration();

hgdriver/hgdev/hg_scanner_239.cpp

@@ -1486,6 +1486,7 @@ int hg_scanner_239::stop(void)
 }
 int hg_scanner_239::reset(void)
 {
+        imgs_.Clear();	// move from scanning done
 	final_imgs_.clear();
 	discard_all_images();
 

hgdriver/hgdev/hg_scanner_300.cpp

@@ -319,6 +319,7 @@ int hg_scanner_300::start(void)
 		return ret;
 
 	final_imgs_.clear();        
+        imgs_.Clear();	// move from scanning done
 
 	//if (is_read_int)
 	//{
@@ -387,6 +388,7 @@ int hg_scanner_300::stop(void)
 		std::lock_guard<std::mutex>      lock(io_lock_);
 		ret = writeusb(usbcb);
 	}
+        VLOG_MINI_1(LOG_LEVEL_DEBUG_INFO, "Write stop command = %d\n", ret);
 
 	if (status_ == SCANNER_ERR_DEVICE_BUSY)
 	{

hgdriver/hgdev/hg_scanner_302.cpp

@@ -1126,6 +1126,7 @@ int hg_scanner_302::stop(void)
 }
 int hg_scanner_302::reset(void)
 {
+        imgs_.Clear();	// move from scanning done
         final_imgs_.clear();
 	discard_all_images();