clientdlg.cpp

能模拟计算机网络的停止等待协议的过程

// clientDlg.cpp : implementation file
//

#include "stdafx.h"
#include "client.h"
#include "ConfigDlg.h"
#include "clientDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CClientDlg dialog

CClientDlg::CClientDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CClientDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CClientDlg)
	m_sShowText = _T("");
	m_sServerIp = _T("");
	m_sServerPort = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CClientDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CClientDlg)
	DDX_Text(pDX, IDC_SHOWTEXT_EDIT, m_sShowText);
	DDX_Text(pDX, IDC_SERVERIP_EDIT, m_sServerIp);
	DDX_Text(pDX, IDC_SERVERPORT_EDIT, m_sServerPort);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CClientDlg, CDialog)
	//{{AFX_MSG_MAP(CClientDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_CONTOSER_BUTTON, OnContoserButton)
	ON_BN_CLICKED(IDC_CONFIG_BUTTON, OnConfigButton)
	ON_BN_CLICKED(IDC_SENDER_BUTTON, OnSenderButton)
	ON_BN_CLICKED(IDC_END_BUTTON, OnEndButton)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CClientDlg message handlers

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

void CClientDlg::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 CClientDlg::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 CClientDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

//连接到服务器
void CClientDlg::OnContoserButton() 
{
	// TODO: Add your control notification handler code here
	unsigned short port;//端口
	CString addstr;
	int ret;
	WSADATA wsaData;

	if (WSAStartup(0x101,&wsaData))
		AfxMessageBox("WSAStartup error! \n");

	cli_sock=socket(AF_INET,SOCK_STREAM,0);

	if (cli_sock==INVALID_SOCKET)
	{
		AfxMessageBox("Socket() error!\n");return;
	}

    //从编辑框得到用户的数据
    GetDlgItem(IDC_SERVERPORT_EDIT)->GetWindowText(m_sServerPort);
	port=atoi(m_sServerPort);//字符串转换成整形
	
	GetDlgItem(IDC_SERVERIP_EDIT)->GetWindowText(m_sServerIp);

	seraddr.sin_family=AF_INET;
	seraddr.sin_port=htons(port);

	seraddr.sin_addr.S_un.S_addr=inet_addr(m_sServerIp);
	
	ret=connect(cli_sock,(struct sockaddr *)&seraddr,sizeof(seraddr));


    if (ret==SOCKET_ERROR)
	{
		AfxMessageBox("Connect to server error!\n Please input correct IP and PORT!\n");
	}	
	else 
	{
		addstr+="Connect server sucessfully!\n";
        Write_to_ShowText(addstr);
	}		
}


//将要显示的信息写入显示框中
void CClientDlg::Write_to_ShowText(CString adds)
{
	CEdit *output=NULL;
	m_sShowText+=adds;
	m_sShowText+="\r\n";
	GetDlgItem(IDC_SHOWTEXT_EDIT)->SetWindowText(m_sShowText);
    output=(CEdit*)GetDlgItem(IDC_SHOWTEXT_EDIT);
	            //跟踪滚动条的位置
	output->LineScroll(output->GetLineCount ());
	return;
}

//设置链路参数
void CClientDlg::OnConfigButton() 
{
	// TODO: Add your control notification handler code here
	CConfigDlg configDlg;

    configDlg.DoModal();
    
	ilost_percent=configDlg.ilost;
	iwrong_percent=configDlg.iwrong;
	timeout_interval=configDlg.itimeout;
	repeatnum=configDlg.irepeatnumber;
	
}

//发送端的工作程序
void CClientDlg::OnSenderButton() 
{
	// TODO: Add your control notification handler code here
	CString tempstr,addstr;
	seq_nr next_frame_to_send;
	frame s,r;
	packet buffer;
	event_type event;
	int recvnum,j;
	Cprotocol Pro_stopwait;
	bool control=true;
	j=0;

	next_frame_to_send=0;//初始化发送状态变量
    
	Pro_stopwait.from_network_layer(&buffer);//从网络层得到要发送的数据
	s.ack=1;

    //构造一个要传输的数据帧
	s.kind=data;
	s.seq=next_frame_to_send;
	s.ack=1-s.ack;
	s.info=buffer;   
	s.checksum=Pro_stopwait.checksum_mat(s.kind,s.seq,s.info);
    //要发送的帧
	addstr="the data that will be send:";
    Write_to_ShowText(addstr);
    addstr=s.info.data;
    Write_to_ShowText(addstr);
	//要发送的帧的序号
	addstr="发送的序号是:";
	Write_to_ShowText(addstr);
	addstr.Format("%d",s.seq);
	Write_to_ShowText(addstr);

     
	do
	{
		
	    Pro_stopwait.to_physical_layer(cli_sock,s,iwrong_percent,ilost_percent);
		Pro_stopwait.wait_for_event(cli_sock,event,timeout_interval);

		//有数据到达时
		if (event==frame_arrival)         
		{
			recvnum=Pro_stopwait.from_physical_layer(cli_sock,r);
            //检查对方是否工作正常
			if(recvnum==-1) 
			{
				addstr="the receiver has closed! Data send will be STOP!";
                Write_to_ShowText(addstr);
				break;
			}
			//收到确认帧	 			 		 
			if(r.kind==ack)  
			{
				addstr="a ACK arrival!";
                Write_to_ShowText(addstr);

				addstr="the number of ACK is:";
                Write_to_ShowText(addstr);
		        addstr.Format("%d",r.ack);
                Write_to_ShowText(addstr);

               
		        addstr="___________________________";
                Write_to_ShowText(addstr);
                
				//收到接收方发来的特殊帧的确认，表示发送方不再发送数据帧
				if (r.checksum=='111')
				{   
					addstr="发送数据将会停止，并和接收端断开连接!!";
					Write_to_ShowText(addstr);
					control=false;
					shutdown(cli_sock,0);

				}
				else
				{
                Pro_stopwait.from_network_layer(&buffer);

                //改变发送状态变量
				inc(next_frame_to_send);

                //构造一个要传输的数据帧
				s.kind=data;
		        s.seq=next_frame_to_send;
		        s.ack=1-s.ack;
		        s.info=buffer;   
		        s.checksum=Pro_stopwait.checksum_mat(s.kind,s.seq,s.info);
                
				//要发送的数据
	            addstr="the data that will be send:";
                Write_to_ShowText(addstr);
                addstr=s.info.data;
		        Write_to_ShowText(addstr);

				//要发送的数据的序号
				addstr="发送的序号是:";
                Write_to_ShowText(addstr);
	            addstr.Format("%d",s.seq);
                Write_to_ShowText(addstr);
				}
				
			}
			else           //收到否认帧
			{
				addstr="a NAK arrival!";
				Write_to_ShowText(addstr);

                 //收到否认帧时,则重发该帧
                s.kind=data;
		        s.seq=next_frame_to_send;
		        s.ack=1-s.ack;
		        s.info=buffer;   //构造一个要传输的数据帧
		        s.checksum=Pro_stopwait.checksum_mat(s.kind,s.seq,s.info);

	            addstr="the data that will be send:";
                Write_to_ShowText(addstr);

                addstr=s.info.data;
                Write_to_ShowText(addstr);

	            addstr="发送的序号是:";
                Write_to_ShowText(addstr);
	            addstr.Format("%d",s.seq);
                Write_to_ShowText(addstr); 
			}
		}//end if (event==frame_arrival)
		else      //超时
		{   
			if (j<=repeatnum)
			{
			addstr="occur timeout event!";
			Write_to_ShowText(addstr);
			}
			else
			{

            shutdown(cli_sock,0);

			}
			j++;
		}
	
	}while(control);//end while循环结束

	shutdown(cli_sock,0);
	
}

//关闭窗口
void CClientDlg::OnEndButton() 
{
	// TODO: Add your control notification handler code here
    closesocket(cli_sock);
	CDialog::OnOK();
}