使用 WinInte API 发送 HTTP 请求
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[] = "
// 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);
// 注意：在使用HttpSendRequestEx 后，必须使用HttpEndRequest
// 才能开始请求header 信息，接收数据。