C / C++ / MFC

// http session
CInternetSession mySession(NULL, 1, PRE_CONFIG_INTERNET_ACCESS, NULL,
                        NULL, 0);
// http connection
CHttpConnection *pHttpConnection;
// http file pointer
CHttpFile       *pHttpFile;
// server url and object.
CString         szServerUrl, szObject;
CString strHeaders = _T("Content-Type: application/x-www-form-urlencoded");

//disable timer
mySession.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT,0xFFFFFFFF,0);

DWORD Post(CString url, CString szFormData, CString & resultString)
{
	// http session
	CInternetSession mySession(NULL, 1, PRE_CONFIG_INTERNET_ACCESS, NULL, 
							NULL, 0);
	// http connection
	CHttpConnection *pHttpConnection;
	// http file pointer
	CHttpFile		*pHttpFile;
	// server url and object.
	CString			szServerUrl, szObject;
	CString strHeaders = _T("Content-Type: application/x-www-form-urlencoded");

	//disable timer
	mySession.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT,0xFFFFFFFF,0);

	// extract server and objects
	szServerUrl = url;
	ExtractObject(szServerUrl,szObject);

	try 
	{
		pHttpConnection = mySession.GetHttpConnection(szServerUrl);	

		if( NULL == pHttpConnection)
		{
			// no exception raised but there is an error. 
			return WEB_ACCESS_UNEXPECTED_ERROR;
		}
	}
	catch (CInternetException *pException)
	{
		char buffer[1023];
		pException->GetErrorMessage(buffer, 1023);
		resultString = buffer;
		return pException->m_dwError;		
	}

	// open request
	try {
		pHttpFile = pHttpConnection->OpenRequest(CHttpConnection::HTTP_VERB_POST, szObject);

		if(NULL == pHttpFile)
		{
			return WEB_ACCESS_UNEXPECTED_ERROR;
		}
	}
	catch(CInternetException *pException)
	{
		char buffer[1023];
		pException->GetErrorMessage(buffer, 1023);
		resultString = buffer;
		return pException->m_dwError;
    }

	// send the request
	try {

		BOOL ret = pHttpFile->SendRequest(strHeaders, (LPVOID)(LPCSTR)szFormData, szFormData.GetLength());

		if( FALSE == ret )
		{
			return WEB_ACCESS_UNEXPECTED_ERROR;
		}
	}
	catch(CInternetException *pException)
	{
		char buffer[1023];
		pException->GetErrorMessage(buffer, 1023);
		resultString = buffer;
		return pException->m_dwError;
	}

	// query status code
	DWORD retCode;
	BOOL ret = pHttpFile->QueryInfoStatusCode(retCode);
	if( FALSE == ret )
	{
		return WEB_ACCESS_QUERY_INFO_ERROR;
	}
	else if( HTTP_STATUS_OK != retCode )
	{
		return retCode;
	}

	char buf[2];
	int bytesRead;
	resultString = "";
	
	while( (bytesRead = pHttpFile->Read(buf, 1)) > 0 )
	{
		resultString += buf[0];
	}
	return WEB_ACCESS_DONE;
}

HHOOK MyHook;
HINSTANCE MyInstance;
LRESULT CALLBACK MyMouseHookProc(int nCode, WPARAM wParam, LPARAM lParam);
extern "C" __declspec(dllexport) void Hook();
extern "C" __declspec(dllexport) void Unhook();

//I initialized MyInstance
BOOL CMouseHook1App::InitInstance()
{
CWinApp::InitInstance();
MyHook = NULL;
MyInstance = this->m_hInstance;
return TRUE;
}

void Hook()
{
if(MyHook == NULL && MyInstance != NULL )
{
MyHook = SetWindowsHookEx(WH_MOUSE,MyMouseHookProc,MyInstance, 0);
if(MyHook!= NULL)
MessageBox(NULL,_T(" HOOKED "), _T(""),0);
}
else
MessageBox(NULL,L" Not Hooked", L"",0);

}

LRESULT CALLBACK MyMouseHookProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if(nCode <0)
{
CallNextHookEx(MyHook,nCode,wParam,lParam);
return 0;
}

if(wParam == WM_LBUTTONDOWN || wParam == WM_NCLBUTTONDOWN)
{
MessageBox(NULL,_T("OK"),_T("Test"),MB_OK);
PostMessage(hWndApp,WM_LBUTTONDOWN,0,0);
}

return CallNextHookEx(MyHook,nCode,wParam,lParam);

}