SendRequest调用失败，GetLastError 返回2(系统找不到指定文件)

Question

使用MFC的HTTP封装库，与服务器进行连接。服务器没问题。
执行httpsendrequest失败，GetLastError 返回2(系统找不到指定文件)
代码如下：

int CHttpClient::ExecuteRequest(LPCTSTR strMethod, LPCTSTR strUrl, LPCTSTR strPostData, string &strResponse)
{
CString strServer;
CString strObject;
DWORD dwServiceType;
INTERNET_PORT nPort;
strResponse = "";
LogString1.Empty();
LogString2.Empty();
CString StrTmp("");
BOOL l_BRet = FALSE;
DWORD l_ErrorCode = 0x00000000;
LogString1.Format("AfxParseURL");
AfxParseURL(strUrl, dwServiceType, strServer, strObject, nPort);

if(AFX_INET_SERVICE_HTTP != dwServiceType && AFX_INET_SERVICE_HTTPS != dwServiceType)
{
    LogString1.Format("dwServiceType:%lu",dwServiceType);
    return FAILURE;
}
try
{
    m_pConnection = m_pSession->GetHttpConnection(strServer,
        dwServiceType == AFX_INET_SERVICE_HTTP ? NORMAL_CONNECT : SECURE_CONNECT,
        nPort);

    m_pFile = m_pConnection->OpenRequest(strMethod, strObject, 
        NULL, 1, NULL, NULL, 
        (dwServiceType == AFX_INET_SERVICE_HTTP ? NORMAL_REQUEST : SECURE_REQUEST));

      DWORD dwFlags;
      l_BRet = m_pFile->QueryOption(INTERNET_OPTION_SECURITY_FLAGS, dwFlags);
      if(l_BRet == FALSE)
      {
          l_ErrorCode = GetLastError();
          LogString1.Format("QueryOption FAIL,GetLastError:%lu\n",l_ErrorCode);
      }
      dwFlags |= SECURITY_FLAG_IGNORE_UNKNOWN_CA;
      l_BRet = m_pFile->SetOption(INTERNET_OPTION_SECURITY_FLAGS, dwFlags);
      if(l_BRet == FALSE)
      {
          l_ErrorCode = GetLastError();
          StrTmp.Format("SetOption FAIL,GetLastError:%lu\n",l_ErrorCode);
          LogString1 =  LogString1 + StrTmp;
      }

      CString szHeaders = L"Accept: audio/x-aiff, audio/basic, audio/midi,\
                    audio/mpeg, audio/wav, image/jpeg, image/gif, image/jpg, image/png,\
                        image/mng, image/bmp, text/plain, text/html, text/htm\r\n";

      m_pFile->AddRequestHeaders("Accept: application/json");
    m_pFile->AddRequestHeaders("Content-Type: application/json;charset=UTF-8");

   l_BRet = m_pFile->SendRequest(NULL, 0, (LPVOID)(LPCTSTR)strPostData, strPostData == NULL ? 0 : _tcslen(strPostData));
  if(l_BRet == FALSE)
  {
      l_ErrorCode = GetLastError();
      StrTmp.Format("HttpSendRequest FAIL,GetLastError:%lu\n",l_ErrorCode);
  }

    DWORD dwRet;
    m_pFile->QueryInfoStatusCode(dwRet);
    if(l_BRet == FALSE)
     {
      l_ErrorCode = GetLastError();
      StrTmp.Format("QueryInfoStatusCode FAIL,GetLastError:%lu\n",l_ErrorCode);
      LogString1 =  LogString1 + StrTmp;
    }
    if(dwRet != HTTP_STATUS_OK)
    {
        CString errText;
        errText.Format("POST出错，错误码：%d", dwRet);
        AfxMessageBox(errText);
    }

    char szChars[BUFFER_SIZE + 1] = {0};
    string strRawResponse = "";
    UINT nReaded = 0;
    while ((nReaded = m_pFile->Read((void*)szChars, BUFFER_SIZE)) > 0)
    {
        szChars[nReaded] = '\0';
        strRawResponse += szChars;
        memset(szChars, 0, BUFFER_SIZE + 1);
    }

    int unicodeLen = MultiByteToWideChar(CP_UTF8, 0, strRawResponse.c_str(), -1, NULL, 0);
    WCHAR *pUnicode = new WCHAR[unicodeLen + 1];
    memset(pUnicode,0,(unicodeLen+1)*sizeof(wchar_t));

    MultiByteToWideChar(CP_UTF8,0,strRawResponse.c_str(),-1, pUnicode,unicodeLen);
    CString cs(pUnicode);
    delete []pUnicode; 
    pUnicode = NULL;

    strResponse = cs;

    Clear();
}
catch (CInternetException* e)
{
    char szErr[1025] = {0};
    e->GetErrorMessage(szErr, 1024);
    LogString2 = szErr;
    Clear();
    DWORD dwErrorCode = e->m_dwError;
    e->Delete();

    DWORD dwError = GetLastError();

    if (ERROR_INTERNET_TIMEOUT == dwErrorCode)
    {

        StrTmp.Format("\nHttp TimeOut,ErroCoder:%lu",dwErrorCode);
        LogString2 += StrTmp;
        return OUTTIME;
    }
    else
    {
        StrTmp.Format("\nHttp FAIL,ErroCoder:%lu",dwErrorCode);
        LogString2 += StrTmp;
        return FAILURE;
    }
}
return SUCCESS;
}

我找了找了一下，实际是httpsendrequest调用失败了。
我不明白的地方是，系统找不到指定文件指的是哪个文件？
这个文件是在本机，还是在服务器上？

先谢过各位大神的指教了。

Answer 1

此问题我也遇到过，是由于浏览器脱机工作引起的；
解决方法：
打开internet explorer， 选择“文件”下拉菜单（没看到的话，按ALT键可以显示菜单栏），然后取消选中“脱机工作”，返回“联机”工作。之后，使用wininet的相关编程将正常工作；SendRequest的返回将正常。