自己用到的一个向服务器上传多个字段的实例，代码不全，仅做参考。

用的是WinINet，上传的字段中包括文件字节流

/*

PHttpRequest中自行组装body之后，HttpSendRequest中自己判断body长度时，

由于文件内容中存在 \0，所以body长度计算错误，导致上传的文件内容不正确，直接指定body的长度也不行...

PHttpRequest中未使用InternetWriteFile，

*/

int UpdateToServer2(stResumeInfo st, int& candId, CString& szUpdateTime, int& nFileSize)

{

    HINTERNET hSession=;

    HINTERNET hConnect=;

    HINTERNET hRequest=;

    DWORD dwNumberOfBytesWritten=;

    DWORD dwBytesSend=;

    DWORD dwFlag = ;

    candId = ;

    szUpdateTime.Empty();

    hSession=InternetOpen(_T("Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0"),

                                 INTERNET_OPEN_TYPE_PRECONFIG,   , INTERNET_INVALID_PORT_NUMBER,  );

    if (==hSession)

    {

        LOG_INFO(L"----- updateResume InternetOpen return 0 !!! GetLastError: %d------", GetLastError());

        return ;

    }

    unsigned short port_ = INTERNET_DEFAULT_HTTP_PORT;

    if (CConfig::GetServerType() == ) //外网用HTTPS

    {

        port_ = INTERNET_DEFAULT_HTTPS_PORT;

    }

    hConnect=InternetConnect(hSession, CConfig::URL_HOST, port_, _T(""), _T(""), INTERNET_SERVICE_HTTP,  ,   );  //URL_HOST不能带http://

    if (==hConnect)

    {

        InternetCloseHandle(hSession);

        LOG_INFO(L"----- updateResume InternetConnect return 0 !!! GetLastError: %d------", GetLastError());

        return ;

    }

    dwFlag=INTERNET_FLAG_RELOAD | INTERNET_FLAG_NO_AUTH | INTERNET_FLAG_NO_UI ;

    if (CConfig::GetServerType() == ) //外网用HTTPS

        dwFlag |= INTERNET_FLAG_SECURE|INTERNET_FLAG_IGNORE_CERT_CN_INVALID|INTERNET_FLAG_IGNORE_CERT_DATE_INVALID|INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTP ;

#ifdef UP_FILE_TO_SEVER

    hRequest=HttpOpenRequest(hConnect, _T("POST"),  RESUME_UPLOAD_URL,  HTTP_VERSION,    ,  ,  dwFlag,  );//old

#else

    hRequest=HttpOpenRequest(hConnect, _T("POST"),  RESUME_UPLOAD_URL_NEW,  HTTP_VERSION,    ,  ,  dwFlag,  );

#endif

    if (==hRequest)

    {

        InternetCloseHandle(hConnect);

        InternetCloseHandle(hSession);

        LOG_INFO(L"----- updateResume HttpOpenRequest return 0 !!! GetLastError: %d------", GetLastError());

        return ;

    }

    if (m_bCancel) return ;

    //设置Header

    //TCHAR content_type[128]={0};

    //_stprintf_s(content_type,TEXT("Content-Type: multipart/form-data; boundary=%s"), _T(ABOUNDARY));

    CString content_type = TEXT("Content-Type: multipart/form-data; boundary=");

    content_type.Append(_T(ABOUNDARY));

    HttpAddRequestHeaders(hRequest,content_type,-,HTTP_ADDREQ_FLAG_ADD|HTTP_ADDREQ_FLAG_REPLACE);

    //验证cid和token

     CString szAuthorization = TEXT("Authorization: ");

    szAuthorization.Append(/*CA2T(s64, CP_UTF8)*/CBackstageManager::GetInstance().GetAuthorizationString());

    HttpAddRequestHeaders(hRequest,szAuthorization, -,HTTP_ADDREQ_FLAG_ADD|HTTP_ADDREQ_FLAG_REPLACE);

    szAuthorization = TEXT("Agent-Info: ");

    szAuthorization.Append(CBackstageManager::GetInstance().GetAgentInfo());

    HttpAddRequestHeaders(hRequest,szAuthorization, -,HTTP_ADDREQ_FLAG_ADD|HTTP_ADDREQ_FLAG_REPLACE); 

#ifdef UP_FILE_TO_SEVER

    //读取文件内容和长度

    HANDLE hFile;

    hFile=CreateFile(st.strFilePath,  GENERIC_READ,   FILE_SHARE_READ|FILE_SHARE_WRITE, ,

        OPEN_EXISTING,  FILE_ATTRIBUTE_NORMAL,  );

    DWORD dwFileSize=GetFileSize(hFile,);

    BYTE* lpBuffer=(BYTE*)VirtualAlloc(,dwFileSize,MEM_COMMIT,PAGE_READWRITE);

    if (==lpBuffer)

    {

        InternetCloseHandle(hRequest);

        InternetCloseHandle(hConnect);

        InternetCloseHandle(hSession);

        LOG_INFO(L"----- updateResume VirtualAlloc return 0 !!! GetLastError: %d------", GetLastError());

        return ;

    }

    DWORD dwRead;

    ReadFile(hFile,lpBuffer,dwFileSize,&dwRead,);

    CloseHandle(hFile);

#endif

    char first_boundary[]={};

    char delimiter[]={};

    char end_boundary[]={};

    sprintf_s(first_boundary,"--%s\r\n",ABOUNDARY);

    sprintf_s(delimiter,"\r\n--%s\r\n",ABOUNDARY);

    sprintf_s(end_boundary,"\r\n--%s--\r\n",ABOUNDARY);

    //LPSTR rn="\r\n"; //HTTP POST数据中的换行必须使用\r\n

    std::map<std::string, std::string> ssmap;

    GetResumeInfoMap(st, ssmap); ////上传给后台必须使用字符串，不能用整型

    //计算body长度

    char content_dispos[]={};

    std::map<std::string, std::string>::iterator it = ssmap.begin();

    int length = strlen(first_boundary);

    for(; it != ssmap.end(); it++)

    {

        memset(content_dispos, , sizeof(content_dispos));

        sprintf_s(content_dispos,"Content-Disposition: form-data; name=\"%s\"\r\n\r\n", it->first.c_str());

        length += strlen(content_dispos);

        length += it->second.length();

        length += strlen(delimiter);

    }

#ifdef UP_FILE_TO_SEVER

    char content_dispos2[]={};

    CString stmName = st.file_name;

    if(stmName.GetLength() > )

    {

        stmName = stmName.Left() + PathFindExtension(stmName); //防止content_dispos2越界

    }

    std::string name = CT2A(stmName, CP_UTF8);

    sprintf_s(content_dispos2, "Content-Disposition: form-data; name=\"file\"; filename=\"%s\"\r\n", name.c_str());

    LPSTR content_type2="Content-Type: application/octet-stream\r\n\r\n";

    //加上File长度

    length +=dwFileSize + strlen(content_dispos2) +strlen(content_type2);

#else

    length -= strlen(delimiter);

#endif

    length += strlen(end_boundary);

    if (m_bCancel) return FALSE;

     INTERNET_BUFFERS BufferIn;

    BufferIn.dwStructSize = sizeof( INTERNET_BUFFERS );

    BufferIn.Next = NULL;

    BufferIn.lpcszHeader = NULL;

    BufferIn.dwHeadersLength = ;

    BufferIn.dwHeadersTotal = ;

    BufferIn.lpvBuffer = NULL;

    BufferIn.dwBufferLength = ;

    BufferIn.dwBufferTotal = length;

    BufferIn.dwOffsetLow = ;

    BufferIn.dwOffsetHigh = ;

    if (!HttpSendRequestEx(hRequest,&BufferIn,,,))

    {

        InternetCloseHandle(hRequest);

        InternetCloseHandle(hConnect);

        InternetCloseHandle(hSession);

        LOG_INFO(L"----- updateResume HttpSendRequestEx return 0 !!! GetLastError: %d------", GetLastError());

        return ;

    }

    //上传body

    InternetWriteFile(hRequest,(byte*)first_boundary,strlen(first_boundary),&dwNumberOfBytesWritten); //first boundary

    int count = ssmap.size();

    std::map<std::string, std::string>::iterator iter = ssmap.begin();

    for(int index = ; iter != ssmap.end(); iter++, index++)

    {

        memset(content_dispos, , sizeof(content_dispos));

        sprintf_s(content_dispos,"Content-Disposition: form-data; name=\"%s\"\r\n\r\n", iter->first.c_str());

        InternetWriteFile(hRequest,(byte*)content_dispos, strlen(content_dispos),&dwNumberOfBytesWritten);

        std::string value = iter->second;

         InternetWriteFile(hRequest,(byte*)value.c_str(), value.length(), &dwNumberOfBytesWritten);

#ifndef UP_FILE_TO_SEVER

         if(index != (count-))

 #endif

            InternetWriteFile(hRequest,(byte*)delimiter,strlen(delimiter),&dwNumberOfBytesWritten);

    }

    if (m_bCancel) return ;

#ifdef UP_FILE_TO_SEVER

    //上传文件

    InternetWriteFile(hRequest,(byte*)content_dispos2,strlen(content_dispos2),&dwNumberOfBytesWritten);

    InternetWriteFile(hRequest,(byte*)content_type2,strlen(content_type2),&dwNumberOfBytesWritten);

    InternetWriteFile(hRequest,lpBuffer,dwFileSize,&dwNumberOfBytesWritten);

#endif

    //last boundary

    InternetWriteFile(hRequest,(byte*)end_boundary,strlen(end_boundary),&dwNumberOfBytesWritten);

    if(!HttpEndRequest(hRequest,,,))

    {

        int a = GetLastError();

        HttpEndRequest(hRequest,,,);

    }

#ifdef UP_FILE_TO_SEVER

    VirtualFree(lpBuffer,,MEM_RELEASE);

#endif

    if (m_bCancel) return ;

    //获取返回数据

    std::stringstream sstream;

    GetResponse(&sstream, hRequest, );

    Json::Value root;

    Json::Reader reader;

    reader.parse(sstream.str(), root);

    int code = -;

    if(!root["code"].isNull())

    {

        code = root["code"].asInt(); //0表示成功,

    }if(!root["data"].isNull())

    {

        Json::Value data = root["data"];

         int userId = data["userId"].asInt();

        candId = data["candId"].asInt();

        int resumeId = data["resId"].asInt();

        nFileSize = data["resSize"].asInt();

    }

    InternetCloseHandle(hRequest);

    InternetCloseHandle(hConnect);

    InternetCloseHandle(hSession);

   return ;

}

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