文件上传到HTTP服务器

文件上传到HTTP服务器

2011-03-14 17:15

最近两个星期主要搞这个东东,到今天总算比较圆满的搞定了. 用http协议上传主要有两种形式: 第一是用http的put协议,第二是用http的post协议.

先说说put协议, 所谓put,顾名思义,就是把文件"放"到server端. 这个过程不涉及文件的http和mime封装(post协议需要做), 因而比较简单.但是考虑到安全问题,一般服务器不会开发put权限,因此这种方法的用途并不广泛

废话不多说,来看看代码:

CInternetSession internetSession("my session"); //定义session

CHttpConnection* httpConnection = internetSession.GetHttpConnection(strServerIP,intServerPort); //获得链接CHttpFile* httpFile = httpConnection->OpenRequest(CHttpConnection::HTTP_VERB_PUT,strRemoteFile,NULL,0,NULL, NULL,INTERNET_FLAG_DONT_CACHE); //发送请求

...

httpFile->SendRequestEx(&BufferIn,NULL,HSR_INITIATE,0);

注意倒数第二句的CHttpConnection::HTTP_VERB_PUT, 表示程序将采用http的put协议上传文件.

再看post协议,这个东东如果只涉及文本还是比较简单的,可以直接post过去,不用构造表单. 但是一旦需要上传文件, 就需要用http和mime的两层封装了. 封装需要对http头和mime标识做一些了解,很恶心=,=. 最需要注意的一点, 在最后SendRequestEx的时候, 传递的参数是文件的字节数,这个字节数应该是所要上传的文件和http头以及mime头的字节总数! 否则即使CLIENT端不出错, server也得不到正确结果的!

也来看看代码吧:

CInternetSession internetSession("my session"); //定义session

CHttpConnection* httpConnection=internetSession.GetHttpConnection(strServerIP,intServerPort); //获得链接

CHttpFile* httpFile = httpConnection->OpenRequest(CHttpConnection::HTTP_VERB_POST,strRemoteFile,NULL,0,NULL, NULL,INTERNET_FLAG_DONT_CACHE); //发送请求

...

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

随便说说,post协议俺用baidu搜了许久,找到了一个类似的程序,研究了许久搞不定.. 后来目有办法, google一个外文论坛, 拜读了某牛人的大作后,终于弄清楚了~ 看来以后还是要多啃鸟文啊..

附上源代码:

put协议:

UpLoadFile::UpLoadFile(void)

{

}

UpLoadFile::~UpLoadFile(void)

{

}

BOOL UpLoadFile::UseHttpSendReqEx(CHttpFile* httpFile, DWORD dwPostSize,CString strLocalFile)

{

try

{

DWORD dwRead,dwRet;

BYTE* buffer;

TRACE("Local file:%sn",strLocalFile);

FILE* fLocal;

if((fLocal=fopen(strLocalFile,"rb"))==NULL)

{

TRACE("Can't open the file:%s,maybe it doesn't exist!n",strLocalFile);

return false;

}

fseek(fLocal,0L,SEEK_END);

dwRead=ftell(fLocal);

rewind(fLocal);

buffer=(BYTE *)malloc(dwRead);

if(!buffer){

TRACE("not enough memory!n");

return false;

}

TRACE("length of file:%dn",dwRead);

dwRead=fread(buffer,1,dwRead,fLocal);

dwPostSize=dwRead;

INTERNET_BUFFERS BufferIn;

DWORD dwBytesWritten;

BOOL bRet;

BufferIn.dwStructSize = sizeof( INTERNET_BUFFERS ); // Must be set or error will occur

BufferIn.Next = NULL;

BufferIn.lpcszHeader = NULL;

BufferIn.dwHeadersLength = 0;

BufferIn.dwHeadersTotal = 0;

BufferIn.lpvBuffer = NULL;

BufferIn.dwBufferLength = 0;

BufferIn.dwBufferTotal = dwPostSize; // This is the only member used other than dwStructSize BufferIn.dwOffsetLow = 0;

BufferIn.dwOffsetHigh = 0;

httpFile->SendRequestEx(&BufferIn,NULL,HSR_INITIATE,0);

//httpFile->SendRequestEx(dwPostSize);

httpFile->Write( buffer, dwPostSize);

if(!httpFile->EndRequest(0,0,0))

{

TRACE( "Error on HttpEndRequest %lu n", GetLastError());

return FALSE;

}

fclose(fLocal);

free(buffer);

return TRUE;

}

catch (CInternetException* pEx)

{

//catch errors from WinInet

}

return FALSE;

}

BOOL UpLoadFile::Upload(CString strLocalFile,CString strServerIP,CString strServerPort,CString strRemoteFile)

{

try

{

DWORD dwPostSize=0;

INTERNET_PORT intServerPort=atoi(strServerPort);

CInternetSession internetSession("my session");

CHttpConnection* httpConnection = internetSession.GetHttpConnection(strServerIP,intServerPort);

if(httpConnection == NULL)

{

TRACE( "Failed to connectn" );

return FALSE;

}

CHttpFile* httpFile = httpConnection->OpenRequest(CHttpConnection::HTTP_VERB_PUT,strRemoteFile,NULL,0,NULL, NULL,INTERNET_FLAG_DONT_CACHE);

//CHttpFile* httpFile = httpConnection->OpenRequest(CHttpConnection::HTTP_VERB_PUT,strRemoteFile);

if(httpFile == NULL)

{

TRACE( "Failed to open request handlen" );

return FALSE;

}

if(UseHttpSendReqEx(httpFile, dwPostSize,strLocalFile))

{

TRACE( "nSend Finished.n" );

httpFile->Close();

httpConnection->Close();

internetSession.Close();

return TRUE;

}

httpFile->Close();

httpConnection->Close();

internetSession.Close();

}

catch (CInternetException* pEx)

{

//catch errors from WinInet

}

return FALSE;

}

post协议:

bool CVoiceXCtrl::UploadPCM()

{

TCHAR tempFilePath[MAX_PATH];

tempFilePath[0] = 0;

GetEnvironmentVariable(_T("ProgramFiles"), tempFilePath, MAX_PATH); if (tempFilePath[0] == 0)

{

strcpy(tempFilePath, "C:\Program Files");

}

strncat(tempFilePath, "\VoiceX\upload.pcm", MAX_PATH);

monWave.Save(tempFilePath);

int startp = m_StandardWavURL.ReverseFind('/');

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

CString pcmname = m_StandardWavURL.Mid(startp+1,namelen);

CString defServerName ="https://www.360docs.net/doc/674478980.html,";

CString defObjectName ="/upload/upload.jsp";

// USES_CONVERSION;

CInternetSession Session;

CHttpConnection *pHttpConnection = NULL;

INTERNET_PORT nPort = 8090;

CFile fTrack;

CHttpFile* pHTTP;

CString strHTTPBoundary;

CString strPreFileData;

CString strPostFileData;

DWORD dwTotalRequestLength;

DWORD dwChunkLength;

DWORD dwReadLength;

DWORD dwResponseLength;

TCHAR szError[MAX_PATH];

void* pBuffer;

LPSTR szResponse;

CString strResponse;

BOOL bSuccess = TRUE;

CString strDebugMessage;

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

{

AfxMessageBox(_T("Unable to open the file."));

return FALSE;

}

CString strFileName = "upload.pcm";

int iRecordID = 1;

strHTTPBoundary = _T("IllBeVerySurprisedIfThisTurnsUp");

strPreFileData = MakePreFileData(strHTTPBoundary, pcmname, iRecordID);

strPostFileData = MakePostFileData(strHTTPBoundary);

AfxMessageBox(strPreFileData);

AfxMessageBox(strPostFileData);

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

dwChunkLength = 64 * 1024;

pBuffer = malloc(dwChunkLength);

if (NULL == pBuffer)

{

return FALSE;

}

try

{

pHttpConnection = Session.GetHttpConnection(defServerName,nPort);

pHTTP = pHttpConnection->OpenRequest(CHttpConnection::HTTP_VERB_POST, _T("/upload/upload.jsp"));

pHTTP->AddRequestHeaders(MakeRequestHeaders(strHTTPBoundary));

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

#ifdef _UNICODE

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

#else

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

#endif

dwReadLength = -1;

while (0 != dwReadLength)

strDebugMessage.Format(_T("%u / %un"), fTrack.GetPosition(), fTrack.GetLength()); TRACE(strDebugMessage);

dwReadLength = fTrack.Read(pBuffer, dwChunkLength);

if (0 != dwReadLength)

{

pHTTP->Write(pBuffer, dwReadLength);

}

}

#ifdef _UNICODE

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

#else

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

#endif

pHTTP->EndRequest(HSR_SYNC);

dwResponseLength = pHTTP->GetLength();

while (0 != dwResponseLength)

{

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

szResponse[dwResponseLength] = '';

pHTTP->Read(szResponse, dwResponseLength);

strResponse += szResponse;

free(szResponse);

dwResponseLength = pHTTP->GetLength();

}

AfxMessageBox(strResponse);

}

catch (CException* e)

{

e->GetErrorMessage(szError, MAX_PATH);

e->Delete();

AfxMessageBox(szError);

bSuccess = FALSE;

}

pHTTP->Close();

delete pHTTP;

fTrack.Close();

if (NULL != pBuffer)

{

free(pBuffer);

}

return bSuccess;

}

CString CVoiceXCtrl::MakeRequestHeaders(CString& strBoundary)

{

CString strFormat;

CString strData;

strFormat = _T("Content-Type: multipart/form-data; boundary=%srn");

strData.Format(strFormat, strBoundary);

return strData;

}

CString CVoiceXCtrl::MakePreFileData(CString& strBoundary, CString& strFileName, int iRecordID)

{

CString strFormat;

CString strData;

strFormat += _T("--%s");

strFormat += _T("rn");

strFormat += _T("Content-Disposition: form-data; name="recordid"");

strFormat += _T("rnrn");

strFormat += _T("%i");

strFormat += _T("rn");

strFormat += _T("--%s");

strFormat += _T("rn");

strFormat += _T("Content-Disposition: form-data; name="trackdata"; filename="%s""); strFormat += _T("rn");

strFormat += _T("Content-Type: audio/wav");

strFormat += _T("rn");

strFormat += _T("Content-Transfer-Encoding: binary");

strFormat += _T("rnrn");

strData.Format(strFormat, strBoundary, iRecordID, strBoundary, strFileName);

return strData;

}

CString CVoiceXCtrl::MakePostFileData(CString& strBoundary)

{

CString strFormat;

CString strData;

strFormat = _T("rn");

strFormat += _T("--%s");

strFormat += _T("rn");

strFormat += _T("Content-Disposition: form-data; name="submitted""); strFormat += _T("rnrn");

strFormat += _T("hello");

strFormat += _T("rn");

strFormat += _T("--%s--");

strFormat += _T("rn");

strData.Format(strFormat, strBoundary, strBoundary);

return strData;

}