MFC文件上传

Question

我怎么上传文件服务器使用c++和MFC。我们不是使用。网。我需要打开一个插座和自己做的一切?如果是这样，那里是一个很好的参考？

Answer 1

你不想使用直接插电话。这是难以获得HTTP对这种方式。

更简单的方法是对适用于Api。检查了文档InternetOpen，这可能会是第一个呼叫你。功能，你将可能需要：

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

你可以找到档所有这些在msdn

Answer 2

这是我最终使用的代码。我删除了错误检查和其他通知内容。这会进行多部分表单上传。

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;

} 

Answer 3

建议使用WinInet。请记住，有包含这些API的MFC类。 如果出于某种原因，这些API不能灵活地满足您的要求（例如，您需要通过代理实现连接，包括身份验证），请查看WinHTTP。它是WinInet的超集（虽然WinHTTP没有MFC包装）。

Answer 4

您可以使用BITS：

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

Answer 5

您也可以使用XMLHTTP。即使您没有发送XML。建立在WinINet上，但更容易使用（如果你以前习惯使用COM）。
请参阅MSDN： http://msdn.microsoft.com/en-us/library /ms759148.aspx

Answer 6

如果您有ftp服务器，请查看CFtpConnection类。