diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index 0cb09d3..a6c5c40 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -1870,6 +1870,8 @@ int hg_scanner::save_usb_data(std::shared_ptr<tiny_buffer> data)
 		if (wait_img_.is_waiting())
 			wait_img_.notify();
 	}
+	unsigned int bytes = data->size();
+	ui_ev_cb_((scanner_handle)this, SANE_EVENT_USB_DATA_RECEIVED, NULL, &bytes, NULL);
 
 	return ret;
 }
@@ -2444,13 +2446,10 @@ int hg_scanner::device_io_control(unsigned long code, void* data, unsigned* len)
 			return SCANNER_ERR_INSUFFICIENT_MEMORY;
 		}
 		
-		char* buf = strcpy((char*)data, fw.c_str());
+		if (data)
+			strcpy((char*)data, fw.c_str());
 
-		if (buf)
-		{
-			return SCANNER_ERR_OK;
-		}
-		return SCANNER_ERR_DATA_DAMAGED;
+		return SCANNER_ERR_OK;
 	}
 	else if(code == IO_CTRL_CODE_GET_SERIAL)
 	{
@@ -2460,12 +2459,10 @@ int hg_scanner::device_io_control(unsigned long code, void* data, unsigned* len)
 			*len = ser.size();
 			return SCANNER_ERR_INSUFFICIENT_MEMORY;
 		}
-		char* buf = strcpy((char*)data, ser.c_str());
-		if (buf)
-		{
-			return SCANNER_ERR_OK;
-		}
-		return SCANNER_ERR_DATA_DAMAGED;
+		if (data)
+			strcpy((char*)data, ser.c_str());
+
+		return SCANNER_ERR_OK;
 	}
 	else if (code == IO_CTRL_CODE_GET_HARDWARE_VERSION)
 	{
@@ -2475,13 +2472,10 @@ int hg_scanner::device_io_control(unsigned long code, void* data, unsigned* len)
 			*len = ip.size();
 			return SCANNER_ERR_INSUFFICIENT_MEMORY;
 		}
-		char* buf = strcpy((char*)data, ip.c_str());
+		if (data)
+			strcpy((char*)data, ip.c_str());
 
-		if (buf)
-		{
-			return SCANNER_ERR_OK;
-		}
-		return SCANNER_ERR_DATA_DAMAGED;
+		return SCANNER_ERR_OK;
 	}
 	else if (code == IO_CTRL_CODE_GET_PAPER_ON)
 	{	
diff --git a/hgsane/sane_hg_mdw.cpp b/hgsane/sane_hg_mdw.cpp
index 05c2b28..bd05f1d 100644
--- a/hgsane/sane_hg_mdw.cpp
+++ b/hgsane/sane_hg_mdw.cpp
@@ -2024,10 +2024,12 @@ extern "C" {	// avoid compiler exporting name in C++ style !!!
 
 
 #ifdef WIN32
+HMODULE	g_my_inst = NULL;
 BOOL WINAPI DllMain(HINSTANCE inst, DWORD reason, LPVOID reserved)
 {
 	if (reason == DLL_PROCESS_ATTACH)
 	{
+		g_my_inst = inst;
 		if (g_sane_path.empty())
 		{
 			char	path[MAX_PATH] = { 0 };