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POMFC C++ file upload with http post returning invalid win apis
 

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  1. POMFC C++ file upload with http post returning invalid win apis
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    <p>I am trying to upload a file using MFC C++ but for some reason i am getting invalid file on the upload. I feels like maybe this is the problem due to wrong header or post information i am using but after several hours tries i cant find my error. Here is my code.. I will appreciate if you experts can elaborate some light on my mistakes so i can correct it...</p> <pre><code>void CFileUpload::UploadByPost(CString strFileName,CString strServerUrl,CString strServerUploadFile) { DWORD dwTotalRequestLength; DWORD dwChunkLength; DWORD dwReadLength; DWORD dwResponseLength; CHttpFile* pHTTP = NULL; dwChunkLength = 64 * 1024; void* pBuffer = malloc(dwChunkLength); CFile file ; if (!file.Open(strFileName.GetBuffer(), CFile::modeRead | CFile::shareDenyWrite)) { return; } CInternetSession session(L"sendFile"); CHttpConnection *connection = NULL; try { //Create the multi-part form data that goes before and after the actual file upload. CString strHTTPBoundary = _T("FFF3F395A90B452BB8BEDC878DDBD152"); CString strPreFileData = MakePreFileData(strHTTPBoundary, file.GetFileName()); CString strPostFileData = MakePostFileData(strHTTPBoundary); CString strRequestHeaders = MakeRequestHeaders(strHTTPBoundary); dwTotalRequestLength = strPreFileData.GetLength() + strPostFileData.GetLength() + file.GetLength(); connection = session.GetHttpConnection(/*L"www.YOURSITE.com"*/strServerUrl.GetBuffer(),NULL,INTERNET_DEFAULT_HTTP_PORT); pHTTP = connection-&gt;OpenRequest(CHttpConnection::HTTP_VERB_POST, strServerUploadFile.GetBuffer());//_T("/YOUURL/submit_file.pl")); pHTTP-&gt;AddRequestHeaders(strRequestHeaders); pHTTP-&gt;SendRequestEx(dwTotalRequestLength, HSR_SYNC | HSR_INITIATE); //Write out the headers and the form variables pHTTP-&gt;Write((LPSTR)(LPCSTR)strPreFileData.GetBuffer(), strPreFileData.GetLength()); //upload the file. dwReadLength = -1; int length = file.GetLength(); //used to calculate percentage complete. while (0 != dwReadLength) { dwReadLength = file.Read(pBuffer, dwChunkLength); if (0 != dwReadLength) { pHTTP-&gt;Write(pBuffer, dwReadLength); } } file.Close(); //Finish the upload. pHTTP-&gt;Write((LPSTR)(LPCSTR)strPostFileData.GetBuffer(), strPostFileData.GetLength()); pHTTP-&gt;EndRequest(HSR_SYNC); //get the response from the server. LPSTR szResponse; CString strResponse; dwResponseLength = pHTTP-&gt;GetLength(); while (0 != dwResponseLength ) { szResponse = (LPSTR)malloc(dwResponseLength + 1); szResponse[dwResponseLength] = '\0'; pHTTP-&gt;Read(szResponse, dwResponseLength); strResponse += szResponse; free(szResponse); dwResponseLength = pHTTP-&gt;GetLength(); } TRACE(L"%s",strResponse.GetBuffer()); //close everything up. pHTTP-&gt;Close(); connection-&gt;Close(); session.Close(); } catch(CInternetException* e) { TRACE(L"error: %d \n",e-&gt;m_dwError); } catch(CFileException* e) { TRACE(L"error: %d \n",e-&gt;m_cause); } catch(...) { TRACE(L" unexpected error"); } } </code></pre> <p>here is my header and post function </p> <pre><code>CString CFileUpload::MakeRequestHeaders(CString&amp; strBoundary) { CString strFormat; CString strData; strFormat = _T("Content-Type: multipart/form-data; boundary=%s\r\n"); strData.Format(strFormat, strBoundary); return strData; } CString CFileUpload::MakePreFileData(CString&amp; strBoundary, CString&amp; strFileName) { CString strFormat; CString strData; strFormat += _T("--%s"); strFormat += _T("\r\n"); strFormat += _T("Content-Disposition: form-data; name=\"file\"; filename=\"%s\""); strFormat += _T("\r\n"); strFormat += _T("Content-Type: text/plain"); strFormat += _T("\r\n"); strFormat += _T(" XXXXX "); strFormat += _T("\r\n\r\n"); strData.Format(strFormat, strBoundary,/* m_Name, strBoundary,*/ strFileName); return strData; } CString CFileUpload::MakePostFileData(CString&amp; strBoundary) { CString strFormat; CString strData; strFormat = _T("\r\n"); strFormat += _T("--%s"); strFormat += _T("\r\n"); strFormat += _T("Content-Disposition: form-data; name=\"submit\""); strFormat += _T("\r\n\r\n"); strFormat += _T(""); strFormat += _T("\r\n"); strFormat += _T("--%s--"); strFormat += _T("\r\n"); strData.Format(strFormat, strBoundary, strBoundary); return strData; } </code></pre> <p>It always return invalid file, the file server code i am using is the following </p> <pre><code>&lt;?php $allowedExts = array("log", "txt"); $extension = end(explode(".", $_FILES["file"]["name"])); if ((($_FILES["file"]["type"] == "text/plain") ) &amp;&amp; ($_FILES["file"]["size"] &lt; 20000) &amp;&amp; in_array($extension, $allowedExts)) { if ($_FILES["file"]["error"] &gt; 0) { echo "Error: " . $_FILES["file"]["error"] . "&lt;br&gt;"; } else { echo "Upload: " . $_FILES["file"]["name"] . "&lt;br&gt;"; echo "Type: " . $_FILES["file"]["type"] . "&lt;br&gt;"; echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB&lt;br&gt;"; echo "Stored in: " . $_FILES["file"]["tmp_name"]; } } else { echo "Invalid file"; } ?&gt; </code></pre> <p>and here is the form</p> <pre><code>&lt;html&gt; &lt;body&gt; &lt;form action="upload_file.php" method="post" enctype="multipart/form-data"&gt; &lt;label for="file"&gt;Filename:&lt;/label&gt; &lt;input type="file" name="file" id="file"&gt;&lt;br&gt; &lt;input type="submit" name="submit" value="Submit"&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Note:- i cant use boost or poco, curl or any third party library.. just only win32 or mfc.</p> <p>here are the pre make and post make data :</p> <p>header</p> <pre><code>"Content-Type: multipart/form-data; boundary=FFF3F395A90B452BB8BEDC878DDBD152 " </code></pre> <p>Pre File </p> <pre><code>"--FFF3F395A90B452BB8BEDC878DDBD152 Content-Disposition: form-data; name="Filename"; filename="ddd.txt" Content-Type: text/plain Content-Transfer-Encoding: binary " </code></pre> <p>Post File</p> <pre><code>" --FFF3F395A90B452BB8BEDC878DDBD152 Content-Disposition: form-data; name="submit" value="submit" --FFF3F395A90B452BB8BEDC878DDBD152-- " </code></pre>
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