udptestdlg.cpp

用UDP实现的一个点对点聊天程序。 用异步方式实现

// UDPTestDlg.cpp : implementation file
//

#include "stdafx.h"
#include "UDPTest.h"
#include "UDPTestDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

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()

/////////////////////////////////////////////////////////////////////////////
// CUDPTestDlg dialog

CUDPTestDlg::CUDPTestDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CUDPTestDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CUDPTestDlg)
	m_your_ip = _T("");
	m_your_port = 0;
	m_my_port = 0;
	m_my_ip = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CUDPTestDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CUDPTestDlg)
	DDX_Text(pDX, IDC_YOUR_IP_EDIT, m_your_ip);
	DDX_Text(pDX, IDC_YOUR_PORT_EDIT, m_your_port);
	DDX_Text(pDX, IDC_MY_PORT_EDIT, m_my_port);
	DDX_Text(pDX, IDC_MY_IP_EDIT, m_my_ip);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CUDPTestDlg, CDialog)
	//{{AFX_MSG_MAP(CUDPTestDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_SEND_BUTTON, OnSendButton)
	ON_WM_DESTROY()
	ON_BN_CLICKED(IDC_START_BUTTON, OnStartButton)
	//}}AFX_MSG_MAP
	ON_MESSAGE(WM_SOCKET_READ,OnSocketRead)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CUDPTestDlg message handlers

BOOL CUDPTestDlg::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_your_ip=m_my_ip=IP;
	m_your_port=m_my_port=PORT;
	UpdateData(FALSE);
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CUDPTestDlg::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 CUDPTestDlg::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 CUDPTestDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}
void CUDPTestDlg::AddMessageToMessageBar(CString strMessage)
{
	CString str;
	GetDlgItemText(IDC_MESSAGE_EDIT,str);
	
	str=strMessage+"\r\n"+str;

	SetDlgItemText(IDC_MESSAGE_EDIT,str);
}
void CUDPTestDlg::OnDestroy() 
{
	CDialog::OnDestroy();
	
	// TODO: Add your message handler code here
	if(m_bStart)
	{
		closesocket(m_server);
	}
	WSACleanup();
}
BOOL CUDPTestDlg::Start()
{
	if(!UpdateData(TRUE))return FALSE;
	m_bStart=FALSE;

	WSAData wsData;
	WORD version=MAKEWORD(2,2);
	if(WSAStartup(version,&wsData))
	{
		AddMessageToMessageBar("start up fail!");
		return FALSE;
	}
	if(version!=wsData.wVersion)
	{
		AddMessageToMessageBar("version not right!");
		return FALSE;
	}
	m_server=socket(PF_INET,SOCK_DGRAM,0);
	if(INVALID_SOCKET==m_server)
	{
		AddMessageToMessageBar("socket create fail!");
		return FALSE;
	}
	memset((void*)&server_addr,0,sizeof(SOCKADDR));
	server_addr.sin_family=AF_INET;
	server_addr.sin_addr.s_addr=inet_addr(m_my_ip);
	server_addr.sin_port=htons(m_my_port);

	int error=bind(m_server,(LPSOCKADDR)&server_addr,sizeof(SOCKADDR));
	if(SOCKET_ERROR==error)
	{
		AddMessageToMessageBar("bind fail!");
		return FALSE;
	}
	error=WSAAsyncSelect(m_server,m_hWnd,WM_SOCKET_READ,FD_READ);
	if(SOCKET_ERROR==error)
	{
		AddMessageToMessageBar("select event fail!");
		return FALSE;
	}

	m_bStart=TRUE;
	AddMessageToMessageBar("open success");
	return TRUE;
}
LRESULT	CUDPTestDlg::OnSocketRead(WPARAM wParam,LPARAM lParam)
{
	if(WSAGETSELECTERROR(lParam))
	{
		AddMessageToMessageBar("occer a read error!");
		return 1L;
	}
	if(WSAGETSELECTEVENT(lParam)!=FD_READ)
	{
		AddMessageToMessageBar("not read message!");
		return 1L;
	}
	if(m_server!=(SOCKET)wParam)
	{
		AddMessageToMessageBar("not my socket!");
		return 1L;
	}

	int nLen=0;
	m_nAddrLen=sizeof(SOCKADDR);
	memset((void*)&client_addr,0,sizeof(SOCKADDR));

	char szData[1024]={0};
	nLen=recvfrom(m_server,szData,1024,0,(LPSOCKADDR)&client_addr,&m_nAddrLen);
	if(SOCKET_ERROR==nLen)
	{
		AddMessageToMessageBar("recvfrom error!");
		return 1L;
	}

	m_your_ip=inet_ntoa(client_addr.sin_addr);
	m_your_port=ntohs(client_addr.sin_port);
	CString str;
	str.Format("接收到数据：ip=[%s],port=[%u][%s]",m_your_ip,m_your_port,szData);
	AddMessageToMessageBar(str);
	UpdateData(FALSE);
	return 0L;
}
void CUDPTestDlg::OnSendButton() 
{	
	if(!UpdateData(TRUE))return;
	char szData[1024]={0};
	int len=GetDlgItemText(IDC_SEND_MESSAGE_EDIT,szData,1024);
	if(len==0)return;

	memset((void*)&client_addr,0,sizeof(SOCKADDR));
	client_addr.sin_family=AF_INET;
	client_addr.sin_addr.s_addr=inet_addr(m_your_ip);
	client_addr.sin_port=htons(m_your_port);
	int nLen=sendto(m_server,szData,len,0,(LPSOCKADDR)&client_addr,sizeof(SOCKADDR));
	if(nLen!=len)
	{
		AddMessageToMessageBar("sendto error!");
		return;
	}
	
	CString str;
	str.Format("发送了消息给[ip=%s,port=%u][%s]",m_your_ip,m_your_port,szData);
	AddMessageToMessageBar(str);
}
void CUDPTestDlg::OnStartButton() 
{
	Start();
}