学步园

LPCTSTR lpszAgent = L"WinInetGet/0.1";
	HINTERNET hInternet = InternetOpen( lpszAgent,
										INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
	LPCTSTR lpszServerName = L"www.alipay.com";//L"ssl.google-analytics.com"; //设置server
	INTERNET_PORT nServerPort = INTERNET_DEFAULT_HTTPS_PORT; // HTTPS端口443
	LPCTSTR lpszUserName = NULL; //无登录用户名
	LPCTSTR lpszPassword = NULL; //无登录密码
    DWORD dwConnectFlags = 0;
	DWORD dwConnectContext = 0;
	HINTERNET hConnect = InternetConnect(   hInternet,
											lpszServerName, nServerPort,
											lpszUserName, lpszPassword,
											INTERNET_SERVICE_HTTP,
											dwConnectFlags, dwConnectContext);
	LPCTSTR lpszVerb = L"GET";
	LPCTSTR lpszObjectName = L"";//L"/urchin.js";
	LPCTSTR lpszVersion = NULL;    // 默认.
	LPCTSTR lpszReferrer = NULL;   // 没有引用页
	LPCTSTR *lplpszAcceptTypes = NULL; // Accpet所有类型.
	DWORD dwOpenRequestFlags =  INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTP |
								INTERNET_FLAG_KEEP_CONNECTION |
								INTERNET_FLAG_NO_AUTH |
								INTERNET_FLAG_NO_COOKIES |
								INTERNET_FLAG_NO_UI | 
								 //设置启用HTTPS
								INTERNET_FLAG_SECURE |
								INTERNET_FLAG_RELOAD;
    DWORD dwOpenRequestContext = 0;
    //初始化Request
    HINTERNET hRequest = HttpOpenRequest(   hConnect, lpszVerb, lpszObjectName, lpszVersion,
											lpszReferrer, lplpszAcceptTypes,
											dwOpenRequestFlags, dwOpenRequestContext);


//发送Request
    BOOL bResult = HttpSendRequest(hRequest, NULL, 0, NULL, 0);
//失败
    if (!bResult) {
        fprintf(stderr, "HttpSendRequest failed, error = %d (0x%x)\n",
            GetLastError(), GetLastError());
        //return 1;
    }
 //获得HTTP Response Header信息
    DWORD dwInfoLevel = HTTP_QUERY_RAW_HEADERS_CRLF;
	DWORD dwInfoBufferLength = 2048;
    BYTE *pInfoBuffer = (BYTE *)malloc(dwInfoBufferLength+2);
	while (!HttpQueryInfo(hRequest, dwInfoLevel, pInfoBuffer, &dwInfoBufferLength, NULL))
    {
        DWORD dwError = GetLastError();
        if (dwError == ERROR_INSUFFICIENT_BUFFER)
        {
            free(pInfoBuffer);
            pInfoBuffer = (BYTE *)malloc(dwInfoBufferLength + 2);
        }
        else
        {
            fprintf(stderr, "HttpQueryInfo failed, error = %d (0x%x)\n",
                GetLastError(), GetLastError());
            break;
        }
    }
	pInfoBuffer[dwInfoBufferLength] = '\0';
    pInfoBuffer[dwInfoBufferLength + 1] = '\0';
    printf("%S", pInfoBuffer); //很奇怪HttpQueryInfo保存的格式是wchar_t 和下面的InternetReadFile不一样
    free(pInfoBuffer);
    //HTTP Response 的 Body, 需要的内容就在里面 
    DWORD dwBytesAvailable;
    while (InternetQueryDataAvailable(hRequest, &dwBytesAvailable, 0, 0))
    {
        BYTE *pMessageBody = (BYTE *)malloc(dwBytesAvailable+1);
        DWORD dwBytesRead;
        BOOL bResult = InternetReadFile(hRequest, pMessageBody,
            dwBytesAvailable, &dwBytesRead);
        if (!bResult)
        {
            fprintf(stderr, "InternetReadFile failed, error = %d (0x%x)\n",
                GetLastError(), GetLastError());
            break;
        }
        if (dwBytesRead == 0)
            break; // End of File.
        pMessageBody[dwBytesRead] = '\0';
        printf("%s", pMessageBody); //InternetReadFile读出来的是普通的char. InternetReadFileEx 似乎是有宽字节版本的
        free(pMessageBody);
	}