使用 WinInte API 发送 HTTP 请求

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BOOL bResult = FALSE;

// 初始化WinInet 环境
HINTERNET hInternet = InternetOpen("CEHTTP", INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, NULL);

// 打开http session
HINTERNET hSession = InternetConnect(hInternet, "www.myserver.com.cn", 8080, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0);

// 打开http post 请求的句柄
char* szAccept[] = {"*/*", NULL};
HINTERNET hRequest = HttpOpenRequest(hSession, "POST", "/myfolder/myfile.jsp", NULL, NULL, (LPCSTR*)szAccept, INTERNET_FLAG_NO_CACHE_WRITE, 0);

// 准备发送的xml 数据,可以是任意长度

char post_data[] = "<Root>...</Root>";


// 外发的header

char headerLanguage[] = "Accept-Language: zh-cn/r/n";
char headerEncoding[] = "Accept-Encoding: gzip, deflate/r/n";
char headerContentType[] = "Content-Type: text/xml/r/n";
char headerContentLength[64];

sprintf(headerContentLength, "Content-Length: %d/r/n", strlen(post_data));

// 添加header 信息

bResult = HttpAddRequestHeaders(hRequest, headerLanguage,    -1, HTTP_ADDREQ_FLAG_ADD|HTTP_ADDREQ_FLAG_REPLACE);

bResult = HttpAddRequestHeaders(hRequest, headerEncoding,    -1, HTTP_ADDREQ_FLAG_ADD|HTTP_ADDREQ_FLAG_REPLACE);

bResult = HttpAddRequestHeaders(hRequest, headerContentType, -1, HTTP_ADDREQ_FLAG_ADD|HTTP_ADDREQ_FLAG_REPLACE);

bResult = HttpAddRequestHeaders(hRequest, headerContentLength, -1, HTTP_ADDREQ_FLAG_ADD|HTTP_ADDREQ_FLAG_REPLACE);

/*=====================================================================
// 简单的发送数据的方法,可用来发送少量数据,或提交GET请求
//===================================================================*/

// bResult = HttpSendRequest(hRequest, NULL, 0, post_data, );

 /*=====================================================================
// 发送大量数据包的方法
//===================================================================*/

INTERNET_BUFFERS BufferIn = {0};

BufferIn.dwStructSize = sizeof( INTERNET_BUFFERS );
BufferIn.dwBufferTotal = strlen(post_data);

bResult = HttpSendRequestEx(hRequest, &BufferIn, NULL, 0, 0);

DWORD written = 0;

bResult = InternetWriteFile(hRequest, (LPVOID)(LPCTSTR)post_data, strlen(post_data), &written);

bResult = HttpEndRequest(hRequest, NULL, 0, 0);

/*=====================================================================
// 发送大量数据包结束
//===================================================================*/
 
LPSTR     lpszData = NULL; // buffer for the data
DWORD     dwSize = 0;           // size of the data available
DWORD     dwDownloaded = 0; // size of the downloaded data

// 请求header 的大小,注意这里的bResult 为FALSE
bResult = HttpQueryInfo(hRequest, HTTP_QUERY_RAW_HEADERS_CRLF, NULL, &dwSize, NULL);
 
// 为接收header 分配内存空间
CHAR* lpHeadersA = new CHAR [dwSize];


// 接收http response 中的header
bResult = HttpQueryInfo(hRequest, HTTP_QUERY_RAW_HEADERS_CRLF, (LPVOID) lpHeadersA, &dwSize, NULL);


// 循环读取数据 
while(1)
{
     // 检查在http response 还有多少字节可以读取

     if (!InternetQueryDataAvailable(hRequest,&dwSize,0,0))
     {
         break;
     }
     else
     {    
         // 分配内存
         lpszData = new char[dwSize+1];

         // 读取数据
         if(!InternetReadFile(hRequest,(LPVOID)lpszData,dwSize,&dwDownloaded))
         {
              delete[] lpszData;
              break;
         }
         else
         {
              // 处理的得到的数据...
              // 检查还有没有剩余数据
              if (dwDownloaded == 0)
                   break;
         }
     }
}
 
// 关闭句柄

InternetCloseHandle(hRequest);
InternetCloseHandle(hSession);
InternetCloseHandle(hInternet);

 

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