WinHttp用法

示例

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#include <string>
#include <iostream>
#include <windows.h>
#include <winhttp.h>
#pragma comment(lib,"winhttp.lib")
#pragma comment(lib,"user32.lib")
 
 
void main()
{
 
     
    DWORD dwSize = 0;
    DWORD dwDownloaded = 0;
    LPSTR pszOutBuffer = NULL;
    HINTERNET  hSession = NULL,
               hConnect = NULL,
               hRequest = NULL;
 
    BOOL  bResults = FALSE;
 
    hSession=WinHttpOpen(L"User-Agent",WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,WINHTTP_NO_PROXY_NAME,WINHTTP_NO_PROXY_BYPASS,0);
 
    if(hSession)
    {
        hConnect=WinHttpConnect(hSession,L"192.168.0.8",INTERNET_DEFAULT_HTTP_PORT,0);
    }
 
    if(hConnect)
    {
        hRequest=WinHttpOpenRequest(hConnect, L"POST",L"login.html",L"HTTP/1.1", WINHTTP_NO_REFERER,WINHTTP_DEFAULT_ACCEPT_TYPES,0);
    }
     
     
     
    LPCWSTR header=L"Content-type: application/x-www-form-urlencoded/r/n";
 
    SIZE_T len = lstrlenW(header);
 
    WinHttpAddRequestHeaders(hRequest,header,DWORD(len), WINHTTP_ADDREQ_FLAG_ADD);
 
    if(hRequest)
    {
 
    std::string data="name=host&sign=xx11sad";
 
    const void *ss=(const char *)data.c_str();
 
    bResults=WinHttpSendRequest(hRequest, 0, 0,const_cast<void *>(ss),data.length(), data.length(), 0 );
 
        ////bResults=WinHttpSendRequest(hRequest,WINHTTP_NO_ADDITIONAL_HEADERS, 0,WINHTTP_NO_REQUEST_DATA, 0, 0, 0 );
    }
 
    if(bResults)
    {
        bResults=WinHttpReceiveResponse(hRequest,NULL);
 
    }
     
    if(bResults)
    {
        do
        {
            // Check for available data.
 
             dwSize = 0;
 
             if (!WinHttpQueryDataAvailable( hRequest, &dwSize))
             {
                 printf( "Error %u in WinHttpQueryDataAvailable.\n",GetLastError());
 
                 break;
             }
 
             if (!dwSize)
                 break;
 
              pszOutBuffer = new char[dwSize+1];
 
              if (!pszOutBuffer)
              {
                   printf("Out of memory\n");
                break;
              }
 
               ZeroMemory(pszOutBuffer, dwSize+1);
 
               if (!WinHttpReadData(hRequest, (LPVOID)pszOutBuffer,  dwSize, &dwDownloaded))
               {
                     printf( "Error %u in WinHttpReadData.\n", GetLastError());
               }
               else
               {
                   printf("%s", pszOutBuffer);
               }
 
               delete [] pszOutBuffer;
 
               if (!dwDownloaded)
                   break;
 
        } while (dwSize > 0);
    }
     
     
 
    if (hRequest) WinHttpCloseHandle(hRequest);
    if (hConnect) WinHttpCloseHandle(hConnect);
    if (hSession) WinHttpCloseHandle(hSession);
 
     
 
     system("pause");
 
 
}

下面的代码示例在请求中包含 If-Modified-Since 标头。将解释响应标头以确定目标文档是否已更新。

C++


  DWORD dwSize = sizeof(DWORD);
  DWORD dwStatusCode = 0;
  BOOL  bResults = FALSE;
  HINTERNET hSession = NULL,
        hConnect = NULL,
        hRequest = NULL;

  // Use WinHttpOpen to obtain a session handle.
  hSession = WinHttpOpen( L"A WinHTTP Example Program/1.0", 
                          WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
                          WINHTTP_NO_PROXY_NAME, 
                          WINHTTP_NO_PROXY_BYPASS,
                          0 );

  // Specify an HTTP server.
  if( hSession )
    hConnect = WinHttpConnect( hSession,
                               L"www.microsoft.com",
                               INTERNET_DEFAULT_HTTP_PORT,
                               0 );

  // Create an HTTP Request handle.
  if( hConnect )
    hRequest = WinHttpOpenRequest( hConnect,
                                   L"GET",
                                   NULL, 
                                   NULL,
                                   WINHTTP_NO_REFERER, 
                                   WINHTTP_DEFAULT_ACCEPT_TYPES,
                                   0 );

  // Add a request header.
  if( hRequest )
    bResults = WinHttpAddRequestHeaders( hRequest, 
                 L"If-Modified-Since: Mon, 20 Nov 2000 20:00:00 GMT",
                                         (ULONG)-1L,
                                         WINHTTP_ADDREQ_FLAG_ADD );

  // Send a Request.
  if( bResults ) 
    bResults = WinHttpSendRequest( hRequest, 
                                   WINHTTP_NO_ADDITIONAL_HEADERS,
                                   0,
                                   WINHTTP_NO_REQUEST_DATA,
                                   0, 
                                   0,
                                   0 );

  // End the request.
  if( bResults )
    bResults = WinHttpReceiveResponse( hRequest, NULL);

  // Use WinHttpQueryHeaders to obtain the header buffer.
  if( bResults )
    bResults = WinHttpQueryHeaders( hRequest, 
                WINHTTP_QUERY_STATUS_CODE | WINHTTP_QUERY_FLAG_NUMBER,
                                    NULL, 
                                    &dwStatusCode,
                                    &dwSize,
                                    WINHTTP_NO_HEADER_INDEX );

  // Based on the status code, determine whether 
  // the document was recently updated.
  if( bResults )
  {
    if( dwStatusCode == 304 ) 
      printf( "Document has not been updated.\n" );
    else if( dwStatusCode == 200 ) 
      printf( "Document has been updated.\n" );
    else 
      printf( "Status code = %u.\n",dwStatusCode );
  }

  // Report any errors.
  if( !bResults )
    printf( "Error %d has occurred.\n", GetLastError( ) );

  // Close open handles.
  if( hRequest ) WinHttpCloseHandle( hRequest );
  if( hConnect ) WinHttpCloseHandle( hConnect );
  if( hSession ) WinHttpCloseHandle( hSession );

要求


最低受支持的客户端	Windows XP、Windows 2000 Professional 和 SP3 [仅限桌面应用]
最低受支持的服务器	Windows Server 2003、具有 SP3 的 Windows 2000 Server [仅限桌面应用]
目标平台	Windows
标头	winhttp.h
Library	Winhttp.lib
DLL	Winhttp.dll
可再发行组件	Windows XP 和 Windows 2000 上的 WinHTTP 5.0 和 Internet Explorer 5.01 或更高版本。