c++ 企业微信上传临时素材，提示errcode\":44001,\"errmsg\":\"empty media data

ok632767947 2017-04-10 04:47:45

int CHttpClient::ExecuteRequestUpload(LPCTSTR strFileName, LPCTSTR strUrl, string &strResponse)  

    {  

        CString strServer;  

        CString strObject;  

        DWORD dwServiceType;  

        INTERNET_PORT nPort;  

        strResponse = "";  

      

        AfxParseURL(strUrl, dwServiceType, strServer, strObject, nPort);  

      

        if(AFX_INET_SERVICE_HTTP != dwServiceType && AFX_INET_SERVICE_HTTPS != dwServiceType)  

        {  

            return FAILURE;  

        }  

      

		CFile fTrack;  

		if (FALSE == fTrack.Open(strFileName, CFile::modeRead | CFile::shareDenyWrite))  

			return -1;    



		CString strRequestHeader=_T("");  

		CString strHTTPBoundary=_T("");  

		CString strPreFileData=_T("");  

		CString strPostFileData=_T("");  



		DWORD dwTotalRequestLength = 0;  

		DWORD dwChunkLength = 0;  

		DWORD dwReadLength = 0;  

		DWORD dwResponseLength = 0;  



		LPSTR szResponse = NULL;





		CString strFilePath = strFileName;

		int startp = strFilePath.ReverseFind('\\');  

		int namelen = strFilePath.GetLength()-startp-1;  



		CString szFileName = strFilePath.Mid(startp+1,namelen);  



		strHTTPBoundary = _T("-----------------------------7d86d16250370");  

		strRequestHeader =MakeRequestHeaders(strHTTPBoundary,strServer,nPort);  

		strPreFileData = MakePreFileData(strHTTPBoundary, szFileName,fTrack.GetLength());  

		strPostFileData = MakeRequestEnders(strHTTPBoundary);  



		dwTotalRequestLength  = strPreFileData.GetLength() + strPostFileData.GetLength() + fTrack.GetLength();

		dwChunkLength = 64 * 1024;  



		void* pBuffer = malloc(dwChunkLength); 

		if (NULL == pBuffer)  

		{

			return -1;  

		}  

		else

		{

			try  

			{  

				m_pConnection = m_pSession->GetHttpConnection(strServer,  

					dwServiceType == AFX_INET_SERVICE_HTTP ? NORMAL_CONNECT : SECURE_CONNECT,  

					nPort);  

				m_pFile = m_pConnection->OpenRequest("POST", strObject,   

					NULL, 1, NULL, NULL,   

					(dwServiceType == AFX_INET_SERVICE_HTTP ? NORMAL_REQUEST : SECURE_REQUEST));  



				m_pFile->AddRequestHeaders(strRequestHeader);

				m_pFile->SendRequestEx(dwTotalRequestLength, HSR_SYNC | HSR_INITIATE);  



#ifdef _UNICODE  

				m_pFile->Write(W2A(strPreFileData), strPreFileData.GetLength());  

#else  

				m_pFile->Write((LPSTR)(LPCSTR)strPreFileData, strPreFileData.GetLength());  

#endif  



				dwReadLength = -1;  

				while (0 != dwReadLength)  

				{   

					dwReadLength = fTrack.Read(pBuffer, dwChunkLength);  

					if (0 != dwReadLength)  

					{  

						m_pFile->Write(pBuffer, dwReadLength);  

					}  

				}  



#ifdef _UNICODE  

				m_pFile->Write(W2A(strPostFileData), strPostFileData.GetLength());  

#else  

				m_pFile->Write((LPSTR)(LPCSTR)strPostFileData, strPostFileData.GetLength());  

#endif  



				m_pFile->EndRequest(HSR_SYNC);  



				dwResponseLength = m_pFile->GetLength();  

				while (0 != dwResponseLength)  

				{ 

					szResponse = (LPSTR)malloc(dwResponseLength + 1);  

					szResponse[dwResponseLength] = '\0';  

					m_pFile->Read(szResponse, dwResponseLength);  

					strResponse += szResponse;    

					free(szResponse); 

					dwResponseLength = m_pFile->GetLength();  

				}  

			}  

			catch (CInternetException* e)  

			{  

				Clear();  

				DWORD dwErrorCode = e->m_dwError;  

				e->Delete();  



				DWORD dwError = GetLastError();  



				if (ERROR_INTERNET_TIMEOUT == dwErrorCode)  

				{  

					return OUTTIME;  

				}  

				else  

				{  

					return FAILURE;  

				}  

			}  

		}



        return SUCCESS;  

    }  







	LPCTSTR CHttpClient::MakeRequestHeaders( LPCTSTR strBoundary, LPCTSTR strServerName, const int nPort)

	{

		TCHAR strFormat[1024] = "";

		static TCHAR strData[1024];



		strcat(strFormat,"Accept-Language: zh-cn");

		strcat(strFormat,"Content-Type: multipart/form-data;boundary=%s\r\n");

		strcat(strFormat,"Connection: keep-alive\r\n");

		strcat(strFormat,"Host:%s\r\n");



		sprintf_s(strData,strFormat,strBoundary,strServerName);



		return strData;

	}



	LPCTSTR CHttpClient::MakePreFileData( LPCTSTR strBoundary, LPCTSTR strFileName ,DWORD dsize)

	{

		TCHAR strFormat[1024] = "";

		static TCHAR strData[1024];



		strcat(strFormat,"--%s\r\n");

        strcat(strFormat,"Content-Disposition: form-data; name=\"media\"; filename=\"%s\"\r\n");

		strcat(strFormat,"Content-Type:image/bmp;image/jpeg;image/x-png;application/zip\r\n");

//		strcat(strFormat,"Content-Transfer-Encoding:binary\r\n\r\n");



		sprintf_s(strData,strFormat,strBoundary,strFileName,dsize);



		return strData;

	}



	LPCTSTR CHttpClient::MakeRequestEnders( LPCTSTR strBoundary )

	{

		TCHAR strFormat[256] = "";

		static TCHAR strEnd[256];



		strcat(strFormat,"\r\n--%s\r\n");

//		strcat(strFormat,"Content-Disposition: form-data;name =\"submitted\"\r\n\r\n");

//		strcat(strFormat,"submit\r\n");

//		strcat(strFormat,"--%s--\r\n");



		sprintf_s(strEnd,strFormat,strBoundary);

		return strEnd;

	}