HTTP GET请求

1.接口实现

CString HttpGetRequest(CString strServerName, int nPort, CString strUrl, CString sParam)
{
    if (strServerName.IsEmpty())
    {
        return "";
    }

    if (strServerName.Mid(strServerName.GetLength() - 1, 1) == "/")
    {
        strServerName = strServerName.Mid(0, strServerName.GetLength() - 1);
    }
    if (strServerName.Find(L"http://") == 0)
    {
        int nLength = strlen("http://");
        strServerName = strServerName.Mid(nLength, strServerName.GetLength() - nLength);
    }
    if (strServerName.Find(L"https://") == 0)
    {
        int nLength = strlen("https://");
        strServerName = strServerName.Mid(nLength, strServerName.GetLength() - nLength);
    }
    
    HINTERNET hInternet = (HINSTANCE)InternetOpen(L"User-Agent", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
    if (!hInternet)
    {
        return "";
    }

    HINTERNET hConnect = (HINSTANCE)InternetConnect(hInternet, strServerName, nPort, NULL, L"HTTP/1.1", INTERNET_SERVICE_HTTP, 0, 0);
    if (!hConnect)
    {
        if (hInternet) InternetCloseHandle(hInternet);
        return "";
    }

    CString strRequestParam = strUrl;
    if (!sParam.IsEmpty())
    {
        strRequestParam = strUrl + L"?" + sParam;
    }    
    HINTERNET hRequest = (HINSTANCE)HttpOpenRequest(hConnect, L"GET", strRequestParam, L"HTTP/1.1", NULL, NULL, INTERNET_FLAG_RELOAD, 0);
    if (!hRequest)
    {
        if (hConnect) InternetCloseHandle(hConnect);
        if (hInternet) InternetCloseHandle(hInternet);
        return "";
    }

    bool bRet;    
    //bRet = HttpAddRequestHeaders(hRequest,"Content-Type: application/x-www-form-urlencoded",Len(FORMHEADERS),HTTP_ADDREQ_FLAG_REPLACE | HTTP_ADDREQ_FLAG_ADD);  
    bRet = HttpSendRequest(hRequest, NULL, 0, NULL, 0);
    std::string strResponse;
    while (TRUE)
    {
        char cReadBuffer[4096];
        unsigned long ulReadByteSize;
        bRet = InternetReadFile(hRequest, cReadBuffer, sizeof(cReadBuffer)-1, &ulReadByteSize);
        if (!bRet || !ulReadByteSize)break;
        cReadBuffer[ulReadByteSize] = 0;
        strResponse = strResponse + cReadBuffer;
    }

    if (hRequest) InternetCloseHandle(hRequest);
    if (hConnect) InternetCloseHandle(hConnect);
    if (hInternet) InternetCloseHandle(hInternet);
    CString csResponse = UTOCS(strResponse);
    return csResponse;
}

2.调用测试

CString sRet = TaskMgr::GetInstance()->HttpGetRequest("https://passport.cnblogs.com", 80, "agreement.html", "");

3.返回结果