通过HTTP协议上传文件

void curl_post_cswuyg()
{
    curl_global_init(CURL_GLOBAL_ALL);
    CURL* hCurl = curl_easy_init();
    if(hCurl != NULL)
    {
        //也许有Expect: 100-continue，去掉它
        curl_slist* pOptionList = NULL;
        pOptionList = curl_slist_append(pOptionList, "Expect:");
        curl_easy_setopt(hCurl, CURLOPT_HTTPHEADER, pOptionList);

        curl_httppost* pFormPost = NULL;
        curl_httppost* pLastElem = NULL;
        //上传文件，指定本地文件完整路径
        curl_formadd(&pFormPost, &pLastElem, CURLFORM_COPYNAME, "ufile01", CURLFORM_FILE, "C:\\temp\\upload_test_curl_cswuyg.txt", CURLFORM_CONTENTTYPE, "application/octet-stream", CURLFORM_END);

        //上传自定义文件内容的文件，CURLFORM_BUFFER指定服务端文件名
        //http://curl.haxx.se/libcurl/c/curl_formadd.html
        char* file_info = "file_info——cswuyg";
        int record_length = std::string(file_info).length();
        curl_formadd(&pFormPost, &pLastElem,
            CURLFORM_COPYNAME, "ufile01",
            CURLFORM_BUFFER, "cswuyg_test.txt",
            CURLFORM_BUFFERPTR, file_info,
            CURLFORM_BUFFERLENGTH, record_length,
            CURLFORM_END);
        //不加一个结束的hfs服务端无法写入文件，一般不存在这种问题，这里加入只是为了测试.
        //curl_formadd(&pFormPost, &pLastElem, CURLFORM_COPYNAME, "end", CURLFORM_COPYCONTENTS, "end", CURLFORM_END);
        curl_easy_setopt(hCurl, CURLOPT_HTTPPOST, pFormPost);
        curl_easy_setopt(hCurl, CURLOPT_URL, "http://127.0.0.1/hfs_up/");

        CURLcode res = curl_easy_perform(hCurl);
        if(res != CURLE_OK)
        {
            std::wcout << "Error" << std::endl;
        }
        curl_formfree(pFormPost);
        curl_easy_cleanup(hCurl);
    }

    curl_global_cleanup();
}

void cswuyg_winhttp_post()
{
    HINTERNET hSession = ::WinHttpOpen(L"cswuyg post test/1.0", WINHTTP_ACCESS_TYPE_NO_PROXY, NULL, NULL, NULL);
    HINTERNET hConnect = ::WinHttpConnect(hSession, L"127.0.0.1", INTERNET_DEFAULT_HTTP_PORT, 0);
    if (hConnect == NULL)
    {
        int i = ERROR_WINHTTP_INCORRECT_HANDLE_TYPE;
        return;
    }
    const wchar_t* lpszAcceptedType[] = {L"*/*", NULL};
    HINTERNET hRequest = ::WinHttpOpenRequest(hConnect, L"POST", L"hfs_up", L"HTTP/1.1", WINHTTP_NO_REFERER, lpszAcceptedType, 0);
    if (hRequest == NULL)
    {
        return;
    }
    DWORD dwTime = 5000;
    ::WinHttpSetOption(hRequest, WINHTTP_OPTION_CONNECT_TIMEOUT, &dwTime, sizeof(DWORD));
    std::wstring strHeader = L"Content-Type: multipart/form-data; boundary=--boundary_cswuygtest\r\n";
    ::WinHttpAddRequestHeaders(hRequest, strHeader.c_str(), strHeader.length(), WINHTTP_ADDREQ_FLAG_ADD | WINHTTP_ADDREQ_FLAG_REPLACE);

    std::string strMIME = "----boundary_cswuygtest\r\n";
    strMIME += "Content-Disposition: form-data; name=\"ufile01\"; filename=\"upload_test_http_cswuyg.txt\"\r\n";
    strMIME += "Content-Type:application/octet-stream\r\n\r\n";
    strMIME += "1\r\n";
    /////////////////////////////
    //除了这个表单之外，后头还必须要有另外的表单信息，否则hfs服务端那边无法写入文件，这里仅为测试。
    //strMIME += "----boundary_cswuygtest\r\n" ;
    //strMIME += "Content-Disposition: form-data; name=\"name\"\r\n\r\n";
    //strMIME += "temp.txt\r\n";
    /////////////////////////
    strMIME += "----boundary_cswuygtest--\r\n";
    /////////////////////////
    //可以直接写入
    //::WinHttpSendRequest(hRequest, strHeader.c_str(), strHeader.length(), (LPVOID)strMIME.c_str(), strMIME.length(), strMIME.length(), 0);

    //也可以后面分步写入
    ::WinHttpSendRequest(hRequest, NULL, 0, NULL, 0, strMIME.length(), 0);
    DWORD dwWritten = 0;
    while(!strMIME.empty())
    {
        ::WinHttpWriteData(hRequest, strMIME.c_str(), strMIME.length(), &dwWritten);
        if (strMIME.length() > dwWritten)
        {
            strMIME.substr(dwWritten);
        }
        else
        {
            strMIME = "";
        }
        
    }
    ::WinHttpReceiveResponse(hRequest, NULL);

    char buf[1024] = { 0 };
    DWORD dwToRead = 1024;
    DWORD dwHaveRead = 0;
    ::WinHttpReadData(hRequest, buf, dwToRead, &dwHaveRead);
    std::cout << buf << std::endl;
    ::WinHttpCloseHandle(hRequest);
    ::WinHttpCloseHandle(hConnect);
    ::WinHttpCloseHandle(hSession);
}