WOSA/XFS service provider

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C++

service

I want to implement Service Provider (SP) for WOSA/XFS ?

What I have tried:

I make DLL with export sum function such this

XFSWRAPPER_SPI HRESULT  WFPOpen(HSERVICE hService, LPSTR lpszLogicalName, HAPP hApp, LPSTR lpszAppID,
	DWORD dwTraceLevel, DWORD dwTimeOut, HWND hWnd, REQUESTID ReqID, HPROVIDER hProvider,
	DWORD dwSPIVersionsRequired, LPWFSVERSION lpSPIVersion, DWORD dwSrvcVersionsRequired, LPWFSVERSION lpSrvcVersion)

XFS Service Provider Call my dll but i can't return any response !!!

My response is

WFSRESULT *pResult = NULL;
	HRESULT hr = ::WFMAllocateBuffer(sizeof(WFSRESULT), WFS_MEM_ZEROINIT, (void **)&pResult);
	pResult->RequestID = ReqID;
	pResult->hService = hService;
	pResult->hResult = WFS_SUCCESS;
	GetLocalTime(&pResult->tsTimestamp);
while (1)
	{
	BOOL b = ::PostMessage(hWnd, WFS_OPEN_COMPLETE, NULL, (LONG)pResult);
	if (b) {
		WriteLogFile("Response Sended");
		break;
	}
	}