2

我如何使用 c++ 和 MFC 将文件上传到网络服务器。我们没有使用.Net。我需要打开一个套接字并自己做所有事情吗？如果是这样，在哪里可以参考？

4

6 回答 6

5

您不想使用直接套接字调用。很难以这种方式正确获取 HTTP。

更简单的方法是使用 WinINet API。查看 InternetOpen 的文档，这可能是您拨打的第一个电话。您可能需要的功能：

  • 互联网开放
  • 互联网连接
  • HttpOpenRequest
  • HttpSendRequest
  • HttpQueryInfo
  • 互联网关闭句柄

您可以在 msdn 上找到所有这些的文档

于 2008-10-01T18:08:50.960 回答
3

这是我最终使用的代码。我去掉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;

}
于 2008-10-16T17:23:35.643 回答
1

建议使用 WinInet。请记住，有包装这些 API 的 MFC 类。如果由于某种原因这些 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（WinHTTP 没有 MFC 包装器）。

于 2008-10-02T07:04:45.290 回答
0

您可以使用 BITS：

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

于 2008-10-01T18:10:13.563 回答
0

您还可以使用 XMLHTTP。即使您不发送 XML。基于 WinINet，但更易于使用（如果您习惯使用 COM）。
请参阅 MSDN：http: //msdn.microsoft.com/en-us/library/ms759148.aspx

于 2008-10-01T18:36:24.933 回答
0

如果您有 ftp 服务器，请查看 CFtpConnection 类。

于 2008-10-02T18:04:29.463 回答