HTTP(GET和POST访问URL) -- wininet

来源：互联网发布：钢铁雄心4mac 编辑：程序博客网时间：2024/05/21 15:45

string CNet::GetUrlHost(string strUrl){string strRtn;if(strUrl.empty())return "";int length = strUrl.length();int i=0;int j=0;for(;i<length;i++){if(strUrl.at(i) == '/'){j++;}if(j == 3)break;}strRtn = strUrl.substr(0,i);length = strRtn.length();int rPos = strRtn.rfind('/');strRtn = strRtn.substr(rPos+1,length);return strRtn;}string CNet::GetUrlOther(string strUrl){string strRtn;if(strUrl.empty())return "";int length = strUrl.length();int i=0;int j=0;for(;i<length;i++){if(strUrl.at(i) == '/'){j++;}if(j == 3)break;}strRtn = strUrl.substr(i,length);return strRtn;}void CNet::GetHttp(string strUrl,string strPost,BOOL bIsShow,BOOL bIsKeepAlive){OutputDebugString(_T("http开始了！"));if(strUrl.empty()){cout<<"输入的url为空！"<<endl;return;}HINTERNET hInternet = InternetOpen( _T("Testing"),INTERNET_OPEN_TYPE_PRECONFIG_WITH_NO_AUTOPROXY,NULL, NULL, 0 ); //初始化WinINetif(hInternet == NULL){cout<<"WinINet初始化失败！"<<endl;return;}string strCntName = GetUrlHost(strUrl);HINTERNET hConnect = InternetConnect(hInternet, stringToLPCWSTR(strCntName), INTERNET_DEFAULT_HTTP_PORT,NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0); //连接服务器if(hConnect == NULL){cout<<"连接服务器失败！"<<endl;InternetCloseHandle(hInternet);return;}string strOther = GetUrlOther(strUrl);strOther.append("\r\n");    HINTERNET hOpenRequest;if(strPost.empty()){hOpenRequest = HttpOpenRequestA(hConnect, "GET",strOther.c_str() , ("HTTP/1.1"), NULL,(LPCSTR*)"*/*", INTERNET_FLAG_DONT_CACHE, 1); //创建http请求  post}else{hOpenRequest = HttpOpenRequestA(hConnect, "POST",strOther.c_str() , ("HTTP/1.1"), NULL,(LPCSTR*)"*/*", INTERNET_FLAG_DONT_CACHE, 1); //创建http请求  post}if(hOpenRequest == NULL){cout<<"创建http请求失败！"<<endl;InternetCloseHandle(hConnect);InternetCloseHandle(hInternet);return;}//添加请求头信息，keepalive  "Connection： keep-alive"//长连接if(bIsKeepAlive == TRUE){LPCSTR header= "Connection： keep-alive/r/n";SIZE_T len = strlen(header);HttpAddRequestHeadersA(hOpenRequest,header,len,NULL);}BOOL bRequest;if(strPost.empty()){bRequest = HttpSendRequestA( hOpenRequest, NULL,0, NULL,0);}else{//post 发送数据DWORD dwSize = (strPost.empty()) ? 0 : strlen(strPost.c_str());bRequest = HttpSendRequestA( hOpenRequest, NULL,0, (LPVOID)strPost.c_str(),dwSize); //发送http请求}int n = GetLastError();if(bRequest == FALSE){cout<<"发送http请求失败！"<<endl;InternetCloseHandle(hConnect);InternetCloseHandle(hInternet);InternetCloseHandle(hOpenRequest);return;}    char szBuffer[1024] = {0};      DWORD dwByteRead = 0;while (InternetReadFile(hOpenRequest, szBuffer, sizeof(szBuffer), &dwByteRead) && dwByteRead > 0){if(bIsShow == TRUE){cout<<szBuffer<<endl;ZeroMemory(szBuffer, dwByteRead);   } }   InternetCloseHandle(hConnect);   InternetCloseHandle(hInternet);   InternetCloseHandle(hOpenRequest);   OutputDebugString(_T("http结束了！"));}

这里实现了get方法和post方法，post方法可以提交数据，strPost代表的提交的数据，通过wireshark抓包分析可知，

数据上传成功，get方法下实现了keepalive（原理是对请求头添加信息 keepalive\r\n，可以开启长连接，当然是否开启成功还是要看服务器是否支持）

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