MFC文件上傳

Question

如何使用C++和MFC將文件上傳到網絡服務器。我們沒有使用.Net。我需要打開一個套接字並自己做一切嗎？如果是這樣，那麼可以參考哪些方面？

Answer 1

你不想使用直接套接字調用。這樣很難獲得HTTP。

更簡單的方法是WinINet API。查看InternetOpen的文檔，這可能是您第一次打電話。功能，你可能會需要：

• InternetOpen
• InternetConnect
• HttpOpenRequest中
• HttpSendRequest中
• HttpQueryInfo
• InternetCloseHandle

你可以找到所有這些文檔在MSDN上

Answer 2

你可以使用BITS：

http://www.codeproject.com/KB/IP/bitsman.aspx

Answer 3

您還可以使用XMLHTTP。即使你沒有發送XML。建立在WinINet之上，但使用起來更容易一些（如果你習慣於使用COM）。
請參閱MSDN：http://msdn.microsoft.com/en-us/library/ms759148.aspx

Answer 4

WinInet建議。請記住，有些MFC包裝這些API。 如果由於某些原因，這些API不能滿足您的需求（例如您需要通過代理實現包括身份驗證在內的連接），請查看WinHTTP。它是WinInet的超集（儘管WinHTTP沒有MFC封裝）。

Answer 5

如果您有一個ftp服務器，請查看CFtpConnection類。

Answer 6

這是我最終使用的代碼。我刪除了錯誤檢查和其他通知的東西。這是一個多部分表單上傳。

DWORD dwTotalRequestLength; 
DWORD dwChunkLength; 
DWORD dwReadLength; 
DWORD dwResponseLength; 
CHttpFile* pHTTP = NULL; 

dwChunkLength = 64 * 1024; 
void* pBuffer = malloc(dwChunkLength); 
CFile file ; 

CInternetSession session("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("www.YOURSITE.com",NULL,INTERNET_DEFAULT_HTTP_PORT); 

pHTTP = connection->OpenRequest(CHttpConnection::HTTP_VERB_POST, _T("/YOUURL/submit_file.pl")); 
pHTTP->AddRequestHeaders(strRequestHeaders); 
pHTTP->SendRequestEx(dwTotalRequestLength, HSR_SYNC | HSR_INITIATE); 

//Write out the headers and the form variables 
pHTTP->Write((LPSTR)(LPCSTR)strPreFileData, 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->Write(pBuffer, dwReadLength); 
    } 
} 

file.Close(); 

//Finish the upload. 
pHTTP->Write((LPSTR)(LPCSTR)strPostFileData, strPostFileData.GetLength()); 
pHTTP->EndRequest(HSR_SYNC); 


//get the response from the server. 
LPSTR szResponse; 
CString strResponse; 
dwResponseLength = pHTTP->GetLength(); 
while (0 != dwResponseLength) 
{ 
    szResponse = (LPSTR)malloc(dwResponseLength + 1); 
    szResponse[dwResponseLength] = '\0'; 
    pHTTP->Read(szResponse, dwResponseLength); 
    strResponse += szResponse; 
    free(szResponse); 
    dwResponseLength = pHTTP->GetLength(); 
} 

AfxMessageBox(strResponse); 

//close everything up. 
pHTTP->Close(); 
connection->Close(); 
session.Close(); 

CString CHelpRequestUpload::MakeRequestHeaders(CString& strBoundary) 
{ 
CString strFormat; 
CString strData; 
strFormat = _T("Content-Type: multipart/form-data; boundary=%s\r\n"); 
strData.Format(strFormat, strBoundary); 
return strData; 
} 

CString CHelpRequestUpload::MakePreFileData(CString& strBoundary, CString& strFileName) 
{ 
CString strFormat; 
CString strData; 

strFormat = _T("--%s"); 
strFormat += _T("\r\n"); 
strFormat += _T("Content-Disposition: form-data; name=\"user\""); 
strFormat += _T("\r\n\r\n"); 
strFormat += _T("%s"); 
strFormat += _T("\r\n"); 

strFormat += _T("--%s"); 
strFormat += _T("\r\n"); 
strFormat += _T("Content-Disposition: form-data; name=\"email\""); 
strFormat += _T("\r\n\r\n"); 
strFormat += _T("%s"); 
strFormat += _T("\r\n"); 

strFormat += _T("--%s"); 
strFormat += _T("\r\n"); 
strFormat += _T("Content-Disposition: form-data; name=\"filename\"; filename=\"%s\""); 
strFormat += _T("\r\n"); 
strFormat += _T("Content-Type: audio/x-flac"); 
strFormat += _T("\r\n"); 
strFormat += _T("Content-Transfer-Encoding: binary"); 
strFormat += _T("\r\n\r\n"); 

strData.Format(strFormat, strBoundary, m_Name, strBoundary, m_Email, strBoundary, strFileName); 

return strData; 
} 

CString CHelpRequestUpload::MakePostFileData(CString& strBoundary) 
{ 

CString strFormat; 
CString strData; 

strFormat = _T("\r\n"); 
strFormat += _T("--%s"); 
strFormat += _T("\r\n"); 
strFormat += _T("Content-Disposition: form-data; name=\"submitted\""); 
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; 

}