diff --git a/bin/x64/Release/AIConnectorSDK.dll b/bin/x64/Release/AIConnectorSDK.dll
index f49af98..8b35fa7 100644
Binary files a/bin/x64/Release/AIConnectorSDK.dll and b/bin/x64/Release/AIConnectorSDK.dll differ
diff --git a/include/AIConnectorAPI.h b/include/AIConnectorAPI.h
index 9aad160..689ef6c 100644
--- a/include/AIConnectorAPI.h
+++ b/include/AIConnectorAPI.h
@@ -14,7 +14,7 @@ extern "C" {
 	bool KVS_API AIPV_Stop(uint32_t handle);
 
 	bool KVS_API AIPV_UploadImage(uint32_t handle, AIPV::AIPVFrameHeader* imgHeader, uint8_t* imgData);
-	bool KVS_API AIPV_MonitorDir(uint32_t handle, const wchar_t* dirPath, AIPV::fcbBeforeUpload callback, void* userData);
+	bool KVS_API AIPV_MonitorDir(uint32_t handle, const wchar_t* dirPath, AIPV::fcbBeforeUpload callback/*, void* userData*/);
 	bool KVS_API AIPV_SubscribeAIResult(uint32_t handle, bool enable, AIPV::fcbAIPVResult callback);
 
 	// module settings
diff --git a/include/AIPVProtocol.h b/include/AIPVProtocol.h
index 1bd59cb..01e3363 100644
--- a/include/AIPVProtocol.h
+++ b/include/AIPVProtocol.h
@@ -145,7 +145,9 @@ namespace AIPV {
 #pragma pack(pop)
 #pragma endregion
 
-	using fcbBeforeUpload = std::function<bool(AIPVFrameHeader* imgHeader, uint8_t* imgData, void* userData)>;
+	//using fcbBeforeUpload = std::function<bool(AIPVFrameHeader* imgHeader, uint8_t* imgData/*, void* userData*/)>;
+	typedef bool(*fcbBeforeUpload)(AIPVFrameHeader* imgHeader, uint8_t* imgData);
+	
 	//using fcbAIPVResult = std::function<void(AIPVResult* result, AIPVStitchResultHeader* stitchresult, uint8_t*	mStitchImgData)>;
 	typedef void(*fcbAIPVResult )(AIPVResult* result, AIPVStitchResultHeader* stitchresult, uint8_t*	mStitchImgData);
 	//using fcbAIPVResult = std::function<void(AIPVResult* result, AIPVStitchResultHeader* stitchresult)>;