【MFC】WinInet类的简单应用

本例使用CWinInet类发送一HTTP请求，获取并显示相应的HTTP响应。

创建一个基于对话框的项目，添加两个文本框和两个按钮，如下图所示。

发送请求按钮的单击消息的消息处理函数如下所示。

void CDemoDlg::OnSendRequest() 
{
    const MAXBUF = 4096;
    CInternetSession session;
    CHttpConnection* pConnection = NULL;
    CHttpFile* pFile = NULL;
    char* buffer = new char[MAXBUF];
    UINT nBytesRead = 0;
    CString strServer, strObject;
	unsigned short nPort;
	DWORD dwServiceType;


	UpdateData(TRUE);
	if(m_strRequest.IsEmpty())
		return;


	if(!AfxParseURL(m_strRequest, dwServiceType, strServer, strObject, nPort))
	{
		MessageBox("HTTP请求解析失败，请重新输入！");
		return;
	}


	try {
        pConnection = session.GetHttpConnection((LPCTSTR)strServer, nPort);
        pFile = pConnection->OpenRequest(1, strObject);
        pFile->SendRequest();
        nBytesRead = pFile->Read(buffer, MAXBUF - 1);
        buffer[nBytesRead] = '\0';


        m_strResponse = buffer;
		UpdateData(FALSE);
    }
    catch(CInternetException* e) {
        e->Delete();
    }


	if(pFile) delete pFile;
    if(pConnection) delete pConnection;
    delete [] buffer;
    return;
}