C语言 NOTE14

===============================================

MFC网络编程1

CAsyncSocket，Csocket， CArchive，和CSocketFile类
其中CArchive是对send和receive数据收发的封装，CSocketFile相当与将数据当作成一个标准文件一样处理，三者结合就相当于对本地文件的读写操作。

1.创建项目：windows 套接字

2.服务器端界面：

• 为控件关联变量：

IP Address Control --- 	CIPAddressCtrl m_ServerIP
Edit Control --- int m_Port
List Box --- CListBox m_ListWords

• 为button控件关联事件：

afx_msg void OnBnClickedButton2();//开始监听
afx_msg void OnBnClickedButton1();//停止监听
afx_msg void OnBnClickedButton3();//退出

• 分别为监听套接字和服务套接字添加类向导基类为CAsyncSocket：
  注：((CchatserverDlg)(AfxGetApp()->m_pMainWnd)) -----为获取主窗口指针

class ListenSocket 
//类内重写虚函数OnAccept
virtual void OnAccept(int nErrorCode);

//定义：由客户端发来的连接消息 触发的
void ListenSocket::OnAccept(int nErrorCode)
{
	Accept(((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ServerSocket);
	((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ServerSocket.AsyncSelect(FD_READ | FD_CLOSE);//阻塞监听读事件和客户端断开事件 
	((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ListWords.AddString("接收了一个连接");
	CAsyncSocket::OnAccept(nErrorCode);
	((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ListWords.SetTopIndex(
		((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ListWords.GetCount() - 1);

}

class ServerSocket 
//类内重写虚函数OnRecieve,OnClose
virtual void OnReceive(int nErrorCode);
virtual void OnClose(int nErrorCode);

//定义：由客户端发来的发送消息 触发的
void ServerSocket::OnReceive(int ErrorCode) 
{
	char buf[50];
	int n = Receive(buf, 50);
	buf[n] = '\0';
	CString buf1;
	buf1.Format("收到：%s", buf);
	((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ListWords.AddString(buf1);
	CAsyncSocket::OnReceive(ErrorCode);
	((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ListWords.SetTopIndex(
		((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ListWords.GetCount() - 1);

}
void ServerSocket::OnClose(int ErrorCode)
{
	((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ListWords.AddString("客户端已断开连接");
	Close();

}

• 在chatserverDlg.h中添加类公有成员：

ListenSocket m_ListenSocket;
ServerSocket m_ServerSocket;

• 具体实现button事件：

void CchatserverDlg::OnBnClickedButton2()
{
	// TODO: 在此添加控件通知处理程序代码 开始监听：
	BYTE nFild[4];
	CString sIP, sPort;
	m_ServerIP.GetAddress(nFild[0], nFild[1], nFild[2], nFild[3]);
	sIP.Format("%d.%d.%d.%d", nFild[0], nFild[1], nFild[2], nFild[3]);
	UpdateData();
	sPort.Format("%d", m_Port);
	m_ListenSocket.Create(m_Port, 1, FD_ACCEPT, sIP);
	m_ListenSocket.Listen(1);
	m_ListWords.AddString("在"+sIP+":"+sPort+"监听..."+"\n"+"等待连接");
	((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ListWords.SetTopIndex(
		((CchatserverDlg*)(AfxGetApp()->m_pMainWnd))->m_ListWords.GetCount() - 1);

	
}

void CchatserverDlg::OnBnClickedButton1()
{
	// TODO: 在此添加控件通知处理程序代码 停止监听
	m_ListenSocket.Close();
	m_ListWords.AddString("监听结束");
}


void CchatserverDlg::OnBnClickedButton3()
{
	// TODO: 在此添加控件通知处理程序代码 退出
	CDialog::OnCancel();
}

3.客户端界面：

• 为控件关联变量：

IP Address Control --- CIPAddressCtrl m_ServerIP;
Edit Control --- int m_sPort;//顶上那个
Edit Control --- CString m_sWords;//底下那个
List Box --- CListBox m_LisrtWords;

• 为button控件关联事件：

afx_msg void OnBnClickedButton1();
afx_msg void OnBnClickedButton2();
afx_msg void OnBnClickedButton3();

• 同样为连接套接字添加类向导基类为CAsyncSocket：

class CClientSocket
//重写虚函数OnConnect
virtual void OnConnect(int nErrorCode);

//定义：由服务器端发来的接受消息 触发的
void CClientSocket::OnConnect(int nErrorCode)
{
	if (nErrorCode)
	{
		AfxMessageBox("连接失败，请您重试");
	}
	((CMFCApplication1Dlg*)(AfxGetApp()->m_pMainWnd))->m_LisrtWords.AddString("连接成功");
	((CMFCApplication1Dlg*)(AfxGetApp()->m_pMainWnd))->m_LisrtWords.SetTopIndex(
		((CMFCApplication1Dlg*)(AfxGetApp(5)->m_pMainWnd))->m_LisrtWords.GetCount() - 1);
}

• 在CMFCApplication1Dlg.h中添加类公有成员：

CClientSocket m_ClientSocket;

• 具体实现button事件：

void CMFCApplication1Dlg::OnBnClickedButton1()
{
	// TODO: 在此添加控件通知处理程序代码 连接
	BYTE nFild[4];
	CString sIP;
	UpdateData();
	m_ServerIP.GetAddress(nFild[0], nFild[1], nFild[2], nFild[3]);
	sIP.Format("%d.%d.%d.%d", nFild[0], nFild[1], nFild[2], nFild[3]);
	m_ClientSocket.Create();
	m_ClientSocket.Connect(sIP, m_sPort);


}

void CMFCApplication1Dlg::OnBnClickedButton2()
{
	// TODO: 在此添加控件通知处理程序代码 断开
	m_ClientSocket.Close();
	m_LisrtWords.AddString("与服务器断开连接");

}

void CMFCApplication1Dlg::OnBnClickedButton3()
{
	// TODO: 在此添加控件通知处理程序代码 发送
	UpdateData();
	m_ClientSocket.Send(m_sWords, m_sWords.GetLength());
	m_LisrtWords.AddString("发送：" + m_sWords);
	m_LisrtWords.SetTopIndex(m_LisrtWords.GetCount() - 1);
}

4.socket通信流程图：