一、建立会话（Session）对象：

       CInternetSession mysession;

二、连接到Http服务器：

      CHttpConnection *myconn=mysession.GetHttpConnection("");

三、打开Http请求：

      CHttpFile *myfile=myconn->OpenRequest("GET","/index.html");

四、发送Http请求：

      myfile->SendRequest();

五、从服务器读取字节流（bytes）：

      CString mystr;

      CString tmp;

      while(myfile->ReadString(tmp))

      {

           mystr+=tmp;

      }

六、释放资源：

     myfile->Close();

      myconn->Close();

     mysession.Close();

     delete myfile;

     delete myconn;

     myfile=0;

     myconn=0;

     步骤基本如上，上例各函数参数主要使用默认参数，具体函数声明请查阅MSDN。另外别忘了异常处理！

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1、下载文件

Download(const CString& strFileURLInServer, //待下载文件的URL

const CString & strFileLocalFullPath)//存放到本地的路径

{

 ASSERT(strFileURLInServer != "");

 ASSERT(strFileLocalFullPath != "");

 CInternetSession session;

 CHttpConnection* pHttpConnection = NULL;

 CHttpFile* pHttpFile = NULL;

 CString strServer, strObject;

 INTERNET_PORT wPort;

 

 DWORD dwType;

 const int nTimeOut = 2000;

 session.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, nTimeOut); //重试之间的等待延时

 session.SetOption(INTERNET_OPTION_CONNECT_RETRIES, 1);   //重试次数

 char* pszBuffer = NULL;  

 

 try

 {

  AfxParseURL(strFileURLInServer, dwType, strServer, strObject, wPort);

  pHttpConnection = session.GetHttpConnection(strServer, wPort);

  pHttpFile = pHttpConnection->OpenRequest(CHttpConnection::HTTP_VERB_GET, strObject);

  if(pHttpFile->SendRequest() == FALSE)

   return false;

  DWORD dwStateCode;

 

  pHttpFile->QueryInfoStatusCode(dwStateCode);

  if(dwStateCode == HTTP_STATUS_OK)

  {

    HANDLE hFile = CreateFile(strFileLocalFullPath, GENERIC_WRITE,

         FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL,

         NULL);  //创建本地文件

   if(hFile == INVALID_HANDLE_VALUE)

   {

    pHttpFile->Close();

    pHttpConnection->Close();

    session.Close();

    return false;

   }

 

   char szInfoBuffer[1000];  //返回消息

   DWORD dwFileSize = 0;   //文件长度

   DWORD dwInfoBufferSize = sizeof(szInfoBuffer);

   BOOL bResult = FALSE;

   bResult = pHttpFile->QueryInfo(HTTP_QUERY_CONTENT_LENGTH,

           (void*)szInfoBuffer,&dwInfoBufferSize,NULL);

 

   dwFileSize = atoi(szInfoBuffer);

   const int BUFFER_LENGTH = 1024 * 10;

   pszBuffer = new char[BUFFER_LENGTH];  //读取文件的缓冲

   DWORD dwWrite, dwTotalWrite;

   dwWrite = dwTotalWrite = 0;

   UINT nRead = pHttpFile->Read(pszBuffer, BUFFER_LENGTH); //读取服务器上数据

 

   while(nRead > 0)

   {

    WriteFile(hFile, pszBuffer, nRead, &dwWrite, NULL);  //写到本地文件

    dwTotalWrite += dwWrite;

    nRead = pHttpFile->Read(pszBuffer, BUFFER_LENGTH);

   }

 

   delete[]pszBuffer;

   pszBuffer = NULL;

   CloseHandle(hFile);

  }

  else

  {

   delete[]pszBuffer;

   pszBuffer = NULL;

   if(pHttpFile != NULL)

   {

    pHttpFile->Close();

    delete pHttpFile;

    pHttpFile = NULL;

   }

   if(pHttpConnection != NULL)

   {

    pHttpConnection->Close();

    delete pHttpConnection;

    pHttpConnection = NULL;

   }

   session.Close();

    return false;

  }

 }

 catch(...)

 {

  delete[]pszBuffer;

  pszBuffer = NULL;

  if(pHttpFile != NULL)

  {

   pHttpFile->Close();

   delete pHttpFile;

   pHttpFile = NULL;

  }

  if(pHttpConnection != NULL)

  {

   pHttpConnection->Close();

   delete pHttpConnection;

   pHttpConnection = NULL;

  }

  session.Close();

  return false;

 }

 

 if(pHttpFile != NULL)

  pHttpFile->Close();

 if(pHttpConnection != NULL)

  pHttpConnection->Close();

 session.Close();

 return true;

}

2、上传文件

bool Download(const CString& strFileURLInServer, //待下载文件的URL

const CString & strFileLocalFullPath)//存放到本地的路径

{

ASSERT(strFileURLInServer != "");

ASSERT(strFileLocalFullPath != "");

CInternetSession session;

CHttpConnection* pHttpConnection = NULL;

CHttpFile* pHttpFile = NULL;

CString strServer, strObject;

INTERNET_PORT wPort;

bool bReturn = false;

DWORD dwType;

const int nTimeOut = 2000;

session.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, nTimeOut); //重试之间的等待延时

session.SetOption(INTERNET_OPTION_CONNECT_RETRIES, 1); //重试次数

char* pszBuffer = NULL;

try

{

AfxParseURL(strFileURLInServer, dwType, strServer, strObject, wPort);

pHttpConnection = session.GetHttpConnection(strServer, wPort);

pHttpFile = pHttpConnection->OpenRequest(CHttpConnection::HTTP_VERB_GET, strObject);

if(pHttpFile->SendRequest() == FALSE)

return false;

DWORD dwStateCode;

pHttpFile->QueryInfoStatusCode(dwStateCode);

if(dwStateCode == HTTP_STATUS_OK)

{

HANDLE hFile = CreateFile(strFileLocalFullPath, GENERIC_WRITE,

FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL,

NULL); //创建本地文件

if(hFile == INVALID_HANDLE_VALUE)

{

pHttpFile->Close();

pHttpConnection->Close();

session.Close();

return false;

}

char szInfoBuffer[1000]; //返回消息

DWORD dwFileSize = 0; //文件长度

DWORD dwInfoBufferSize = sizeof(szInfoBuffer);

BOOL bResult = FALSE;

bResult = pHttpFile->QueryInfo(HTTP_QUERY_CONTENT_LENGTH,

(void*)szInfoBuffer,&dwInfoBufferSize,NULL);

dwFileSize = atoi(szInfoBuffer);

const int BUFFER_LENGTH = 1024 * 10;

pszBuffer = new char[BUFFER_LENGTH]; //读取文件的缓冲

DWORD dwWrite, dwTotalWrite;

dwWrite = dwTotalWrite = 0;

UINT nRead = pHttpFile->Read(pszBuffer, BUFFER_LENGTH); //读取服务器上数据

while(nRead > 0)

{

WriteFile(hFile, pszBuffer, nRead, &dwWrite, NULL); //写到本地文件

dwTotalWrite += dwWrite;

nRead = pHttpFile->Read(pszBuffer, BUFFER_LENGTH);

}

delete[]pszBuffer;

pszBuffer = NULL;

CloseHandle(hFile);

bReturn = true;

}

}

catch(CInternetException* e)

{

TCHAR tszErrString[256];

e->GetErrorMessage(tszErrString, ArraySize(tszErrString));

TRACE(_T("Download XSL error! URL: %s,Error: %s"), strFileURLInServer, tszErrString);

e->Delete();

}

catch(...)

{

}

if(pszBuffer != NULL)

{

delete[]pszBuffer;

}

if(pHttpFile != NULL)

{

pHttpFile->Close();

delete pHttpFile;

}

if(pHttpConnection != NULL)

{

pHttpConnection->Close();

delete pHttpConnection;

}

session.Close();

return bReturn;

}