如何从用 MFC (MSVC 2008) 编写的应用程序查询基于 CGI 的网络服务器并处理结果？

Posted 2023-02-16

【中文标题】如何从用 MFC (MSVC 2008) 编写的应用程序查询基于 CGI 的网络服务器并处理结果？

【英文标题】：How to query a CGI based webserver from an app written in MFC (MSVC 2008) and process the result?

【发布时间】：2010-05-20 14:15:09

【问题描述】：

我正在探索使用搜索字符串（比如http://sw.mycompany.com/~tools/cgi-bin/script.cgi?param1=value1&param2=value2&param3=value3 的形式）查询网页的选项，该网页的末尾运行了一个 CGI 脚本，并在我的应用程序上显示结果（到期后当然是处理）。我的应用程序是用 MFC C++ 编写的，我必须承认我以前从未尝试过任何与网络编程相关的事情。

我想做的事情是不是很不可行？如果没有，谁能指出我需要查看的资源才能做到这一点？

谢谢！

【参考方案1】：

CInternetSession internet_session;

CHttpConnection* connection = NULL;
CHttpFile* file = NULL;
TRY 
    connection = internet_session.GetHttpConnection("www.somehost.com", (INTERNET_PORT)80);
    // URI needs to be a relative path here
    file = connection->OpenRequest(CHttpConnection::HTTP_VERB_GET, "/some/file/on/server", NULL, 1, NULL, "HTTP/1.1");
    BOOL send_result = file->SendRequest();
    if (send_result == FALSE) 
        // When can this happen? Only when connection fails between this and the previous call.
        // Need to use ugly MFC exception stuff because OpenRequest et al. use it.
        ::AfxThrowInternetException(internet_session.GetContext());
    

CATCH (CInternetException, e) 
    if (file) 
        file->Close();
    
    delete connection;
    file = NULL;
    connection = NULL;

END_CATCH

if (!file) 
    delete file;
    delete connection;
    return false;


DWORD status_code;
file->QueryInfoStatusCode(status_code);
if (status_code != 200) 
    CString result;
    if (status_code == 403) 
        result.Format("Authentication error (HTTP 403)");
     else if (status_code == 404) 
        result.Format("Object not found (HTTP 404)");
     else if (status_code == 500) 
        result.Format("Application error: malformed request (HTTP 500)");
     else 
        result.Format("Got unsupported HTTP status code %d", status_code);
    
    file->Close();
    delete file;
    delete connection;
    return false;

【参考方案2】：

MFC 支持构建 Http 客户端。有关详细信息，请参阅 MSDN 中的 article。

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