如何在MFC中从HTTP服务器获得响应

How can I get a response from an HTTP server in MFC?

本文关键字：服务器 响应 HTTP 中从 MFC      更新时间：2023-10-16

我是一名学习MFC的学生。我想从MFC中的HTTP服务器套接字编程中获得响应。但是我不能解决这个问题。

我的代码是：

SOCKET m_client_socket;
WSADATA wsadata;
struct sockaddr_in server_addr;
char *http_Request;
char *http_recv_data;
int recv_len;
if (!WSAStartup(DESIRED_WINSOCK_VERSION, &wsadata))
{
    if (wsadata.wVersion < MINIMUM_WINSOCK_VERSION)
    {
        WSACleanup();
        return;
    }
}
// Create socket
m_client_socket = socket(PF_INET, SOCK_STREAM, 0);
if (m_client_socket == INVALID_SOCKET)
{
    AfxMessageBox("socket error : ");
    WSACleanup();
    return;
}
// Set value
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = inet_addr("www.example.com");
server_addr.sin_port = htons(80);
// Connect
if (connect(m_client_socket, (LPSOCKADDR)&server_addr, sizeof(server_addr)) == SOCKET_ERROR)
{
    AfxMessageBox("connect error : ");
    closesocket(m_client_socket);
    return;
}
// send(m_client_socket, http_Request, strlen(http_Request), 0);
recv_len = recv(m_client_socket, http_recv_data, BUFSIZE, 0);
http_recv_data[recv_len] = '';
MessageBox(http_recv_data, "Return Value", NULL);
// Close
closesocket(m_client_socket);
WSACleanup();

没有错误，但我收到了NULL。帮帮我，先生！

MFC将Internet会话实现为类CInternetSession的对象。使用此类，您可以创建一个Internet会话或多个同时会话。

这里有一个例子：

#include <AfxInet.h>
CInternetSession session;
CHttpFile *pHttpFile = NULL;
try
{
    pHttpFile = (CHttpFile *)session.OpenURL(_T("http://www.google.com"));
}
catch (CInternetException)
{
    // Handle exception
}
if(pHttpFile != NULL)
{
    CByteArray data;
    data.SetSize(1024);
    int nBytesRead = pFile->Read(data.GetData(), data.GetSize());
}

你也可以直接说：

CInternetSession session; 
CHttpConnection* pServer = NULL;
CHttpFile* pFile = NULL;
CString szHeaders( _T("Content-Type: application/x-www-form-urlencoded;Accept: text/xml, text/plain, text/html, text/htmrnHost: www.mydomain.comrnrn"));
CString strObject; 
DWORD dwRet;
CByteArray dataBuf;
dataBuf.SetSize(1024);
try
{
   INTERNET_PORT nPort(80);
   pServer = session.GetHttpConnection(_T("www.mydomain.com"), nPort);
   pFile = pServer->OpenRequest(CHttpConnection::HTTP_VERB_GET, strObject);
   pFile->AddRequestHeaders(szHeaders);
   pFile->SendRequest();
   pFile->QueryInfoStatusCode(dwRet);
   if (dwRet == HTTP_STATUS_OK)
   {
       UINT nRead = pFile->Read(dataBuf.GetData(), dataBuf.GetSize());
   }
   delete pFile;
   delete pServer;
}
catch (CInternetException* pEx)
{
   TCHAR sz[1024];
   pEx->GetErrorMessage(sz, 1024);
   pEx->Delete();
}
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