chatcasyncsocketdlg.cpp

用VC实现的一个聊天客户端,通过输入服务器的IP和端口号连接到服务器

// ChatCAsyncSocketDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ChatCAsyncSocket.h"
#include "ChatCAsyncSocketDlg.h"
#include <ASSERT.H>

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About
#define BUFFER_SIZE 4096

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CChatCAsyncSocketDlg dialog

CChatCAsyncSocketDlg::CChatCAsyncSocketDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CChatCAsyncSocketDlg::IDD, pParent),m_ClientSocket(this),m_ListenSocket(this)
{
	//{{AFX_DATA_INIT(CChatCAsyncSocketDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CChatCAsyncSocketDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CChatCAsyncSocketDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CChatCAsyncSocketDlg, CDialog)
	//{{AFX_MSG_MAP(CChatCAsyncSocketDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_CONNECT, OnConnect)
	ON_BN_CLICKED(IDC_LISTEN, OnListen)
	ON_EN_UPDATE(IDC_INPUTTEXT,SendMessageToPeer)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CChatCAsyncSocketDlg message handlers

BOOL CChatCAsyncSocketDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	m_bActive=FALSE;

	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CChatCAsyncSocketDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CChatCAsyncSocketDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CChatCAsyncSocketDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}
void CChatCAsyncSocketDlg::OnConnect() 
{
	// TODO: Add your control notification handler code here
	sockaddr_in addr;
	CString buffer;
	UINT port;
	char serverIP[16];
	CWnd *subWnd;

	//得到控制流
	subWnd=GetDlgItem(IDC_LISTEN_PORT_C);
	subWnd->GetWindowText(buffer);
	port= UINT(atoi(LPCSTR(buffer)));
	subWnd=GetDlgItem(IDC_SERVERIP);
	subWnd->GetWindowText(buffer);
	strncpy(serverIP,LPCTSTR(buffer),16);

	//结束最后的进程
	ExitChat();

	m_bClient=TRUE;
	if(inet_addr(serverIP)==INADDR_NONE)
	{
		AfxMessageBox("无效IP地址!");
		return;
	}

	//产生 tcp/stream数据socket
	m_ClientSocket.Create(0,SOCK_STREAM);

	// 设置服务器的地址和端口
	addr.sin_family = AF_INET;
	addr.sin_addr.S_un.S_addr = inet_addr(serverIP);
	addr.sin_port = htons(port);   //short from host to network format
	
	//连接到服务器 
	m_ClientSocket.Connect((sockaddr*)&addr, sizeof(addr));
	m_ChatWords+="连接...\r\n";
	RefreshScreen();
}

void CChatCAsyncSocketDlg::OnListen() 
{
	// TODO: Add your control notification handler code here
	CString buffer;
	CWnd *subWnd;
	UINT port;
	BOOL bRet;

	//得到控制流 
	subWnd=GetDlgItem(IDC_LISTEN_PORT_S);
	subWnd->GetWindowText(buffer);
	port= UINT(atoi(LPCSTR(buffer)));

	ExitChat();
	m_bClient=FALSE;
	
	//产生一个基于tcp/stream的socket
	bRet=m_ListenSocket.Create(port);
	if(bRet==FALSE)
	{
		m_ChatWords+="服务器出错.\r\n";
		GetErrorReason(WSAGetLastError());
		RefreshScreen();
		m_ListenSocket.Close();
		return;
	}
		
	//监听
	bRet=m_ListenSocket.Listen(5);
	if(bRet == FALSE)
	{
		m_ChatWords+="Listen error.\r\n";
		RefreshScreen();
		AfxMessageBox("监听错误.");
		return;
	}

	m_ChatWords+="服务器在监听...\r\n";
	RefreshScreen();
	m_bActive=TRUE;
}

void CChatCAsyncSocketDlg::OnSocketReceive(CDataSocket *pSocket)
{
	if(m_bClient)
	{
		assert(pSocket==&m_ClientSocket);
		OnClientReceive();
	}
	else
		OnServerReceive(pSocket);
}

void CChatCAsyncSocketDlg::OnSocketClose(CDataSocket *pSocket)
{
	if(m_bClient)
	{
		assert(pSocket==&m_ClientSocket);
		OnClientClose();
	}
	else
		OnServerClose(pSocket);
}

void CChatCAsyncSocketDlg::OnClientConnect(int iResult)
{
	CString buffer;
	sockaddr_in name;
	int namelen;
	
	if(iResult!=0)
	{
		GetErrorReason(iResult);
		buffer.Format("连接失败.\r\n");
		m_ChatWords+=buffer;
		RefreshScreen();
		m_ClientSocket.Close();
	}
	else
	{
		namelen=sizeof(sockaddr_in);
		m_ClientSocket.GetPeerName((sockaddr*)&name,&namelen);
		buffer.Format("成功连接到 %s:%d.\r\n",inet_ntoa(name.sin_addr),ntohs(name.sin_port));
		m_ChatWords+=buffer;
		RefreshScreen();
		m_bActive=TRUE;
	}
}

void CChatCAsyncSocketDlg::OnClientReceive()
{
	char buffer[BUFFER_SIZE+1];
	int retCode;
	retCode=m_ClientSocket.Receive(buffer,BUFFER_SIZE,0);
	if(retCode!=SOCKET_ERROR)
	{
		buffer[retCode]=NULL;
		m_ChatWords+=buffer;
	}
	else
		GetErrorReason(WSAGetLastError());
	RefreshScreen();
}

void CChatCAsyncSocketDlg::OnClientClose()
{
	GetErrorReason(WSAGetLastError());
	m_ClientSocket.Close();
	m_ChatWords+="服务器关闭。成功退出\t.\r\n";
	RefreshScreen();
	m_bActive=FALSE;
}

void CChatCAsyncSocketDlg::OnServerAccept()
{
	CDataSocket *pSocket = new CDataSocket(this);
	int i,namelen;
	char buffer[BUFFER_SIZE+1];
	sockaddr_in name;
	namelen=sizeof(name);

	//接受用户的连接
	m_ListenSocket.Accept(*pSocket,NULL,NULL);
	//
	pSocket->GetPeerName((sockaddr*)&name,&namelen);
	//向其他用户发送信息
	sprintf(buffer,"新用户加入我们.(%s:%d)\r\n",inet_ntoa(name.sin_addr),ntohs(name.sin_port));
	m_ChatWords+=buffer;
	for(i=0;i<m_DataSockets.GetSize();i++)
		m_DataSockets[i]->SendData(buffer,strlen(buffer));
	//向新用户发送欢迎信息
	sprintf(buffer, "欢迎 !(你的 ID 是: %s:%d.)\r\n",inet_ntoa(name.sin_addr),ntohs(name.sin_port));
	
	pSocket->SendData(buffer,strlen(buffer));
	//刷新
	RefreshScreen();
	//把用户的socket压入堆栈
	m_DataSockets.Add(pSocket);
}

void CChatCAsyncSocketDlg::OnServerReceive(CDataSocket *pSocket)
{
	int i,retCode;
	char buffer[BUFFER_SIZE+1];
	//得到用户的消息
	retCode=pSocket->Receive(buffer,BUFFER_SIZE,0);
	buffer[retCode]=NULL;
	//向其他用户发送信息
	for(i=0;i<m_DataSockets.GetSize();i++)
	{
		if(pSocket!=m_DataSockets[i])
			m_DataSockets[i]->SendData(buffer,strlen(buffer));
	}
	m_ChatWords+=buffer;
	
	RefreshScreen();
}

void CChatCAsyncSocketDlg::OnServerClose(CDataSocket *pSocket)
{
	int i,namelen;
	CString buffer;
	sockaddr_in name;
	namelen=sizeof(name);
	//关闭离开的用户的sock
	pSocket->GetPeerName((sockaddr*)&name,&namelen);
	pSocket->Close();
	//将用户的sock清空
	for(i=0; i<m_DataSockets.GetSize(); i++)
	{
		if(m_DataSockets[i]==pSocket)
		{
			m_DataSockets.RemoveAt(i);
			break;
		}
	}
	//刷新
	buffer.Format("用户 %s:%d 离开.\r\n", inet_ntoa(name.sin_addr),ntohs(name.sin_port));
	for(i=0; i<m_DataSockets.GetSize(); i++)
		m_DataSockets[i]->SendData(LPCSTR(buffer), buffer.GetLength());
	m_ChatWords+=buffer;
	RefreshScreen();
	delete pSocket;
}

//将聊天内容封装
void CChatCAsyncSocketDlg::RefreshScreen()
{
	int n;
	GetDlgItem(IDC_SHOWTEXT)->SetWindowText(m_ChatWords);
	n=((CEdit *)(GetDlgItem(IDC_SHOWTEXT)))->GetLineCount();
	((CEdit *)(GetDlgItem(IDC_SHOWTEXT)))->LineScroll(n);
}

//向其他人发送信息
void CChatCAsyncSocketDlg::SendMessageToPeer()
{
	CString buffer;
	int i;
	static int oldNumOfChars=0;
	CWnd *subwnd;

	subwnd=GetDlgItem(IDC_INPUTTEXT);
	subwnd->GetWindowText(buffer);
	if(oldNumOfChars!=buffer.GetLength())
	{
		oldNumOfChars=buffer.GetLength();
		return;
	}
	//清空编辑框
	subwnd->SetWindowText("");
	oldNumOfChars=0;
	if(!m_bActive)
	{
		m_ChatWords+=buffer;
		m_ChatWords+="(只有你一个人了.)\r\n";
		RefreshScreen();
		return;
	}
	buffer+="\r\n";
	m_ChatWords+=buffer;
	RefreshScreen();
	if(m_bClient)
		m_ClientSocket.SendData(LPCSTR(buffer),buffer.GetLength());
	else
	{
		for(i=0;i<m_DataSockets.GetSize();i++)
			m_DataSockets[i]->SendData(LPCSTR(buffer),buffer.GetLength());
	}
}

void CChatCAsyncSocketDlg::ExitChat()
{
	int i;
	CString buffer;
	if(m_bActive)
	{
		if(m_bClient)
		{
			m_ClientSocket.Close();
			m_ChatWords+="成功退出.\r\n";
			RefreshScreen();
		}
		else
		{
			buffer="I will leave. Pls clients log out ASAP.\r\n";
			for(i=0; i<m_DataSockets.GetSize(); i++)
			{
				m_DataSockets[i]->SendData(LPCSTR(buffer),buffer.GetLength());
				m_DataSockets[i]->Close();
				delete m_DataSockets[i];
			}
			m_DataSockets.RemoveAll();
			
			m_ListenSocket.Close();
			m_ChatWords+="成功的关闭.\r\n";
			RefreshScreen();
		}
	}
	m_bActive=FALSE;
}

void CChatCAsyncSocketDlg::GetErrorReason(int nErrorCode)
{
	LPVOID lpMsgBuf;
	FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
		NULL,nErrorCode,MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &lpMsgBuf,0,NULL);
	m_ChatWords+=(char *)lpMsgBuf;
	LocalFree( lpMsgBuf );
}

void CChatCAsyncSocketDlg::OnOK() 
{
	// TODO: Add extra validation here
	CDialog::OnOK();
}