arqdlg.cpp

ARQ协议模拟实现是为了编写一个基于对话框的程序来模拟演示自动重发协议。输入模拟发送帧的数目

// ARQDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ARQ.h"
#include "ARQDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CARQDlg dialog

CARQDlg::CARQDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CARQDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CARQDlg)
	m_eveSend = _T("");
	m_eveRecv = _T("");
	m_buff = _T("");
	m_size = 0;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CARQDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CARQDlg)
	DDX_Control(pDX, IDC_SETTING, m_setting);
	DDX_Control(pDX, IDC_SEND, m_send);
	DDX_Text(pDX, IDC_EVE_SEND, m_eveSend);
	DDX_Text(pDX, IDC_EVE_RECV, m_eveRecv);
	DDX_Text(pDX, IDC_BUFF, m_buff);
	DDX_Text(pDX, IDC_TEXT, m_size);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CARQDlg, CDialog)
	//{{AFX_MSG_MAP(CARQDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_SETTING, OnSetting)
	ON_WM_TIMER()
	ON_BN_CLICKED(IDC_SEND, OnSend)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CARQDlg message handlers

BOOL CARQDlg::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
	setting.DoModal();
	SYSTEMTIME t;
	GetSystemTime(&t);
	srand(t.wMilliseconds);
	vs=0;
	vr=0;
	time=0;
	curr=0;
	queue=0;

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

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

void CARQDlg::OnSetting() 
{
	// TODO: Add your control notification handler code here
	setting.DoModal();
	
}

void CARQDlg::OnTimer(UINT nIDEvent) 
{
	// TODO: Add your message handler code here and/or call default
	KillTimer(nIDEvent);
	switch(nIDEvent) {
	case WM_TIMEOUT:
		OnTimeOut();
		break;
	case WM_TOBUFFER:
		ToBuffer();
		break;
	case WM_SENDFRAME:
		SendFrame();
		break;
	case WM_RECEIVE:
		OnRecv();
		break;
	case WM_ONACK:
		OnACK();
		break;
	case WM_ONNAK:
		OnNAK();
		break;
	case WM_SENDACK:
		SendACK();
		break;
	case WM_SENDNAK:
		SendNAK();
		break;
	default:
		break;
	}
	
	CDialog::OnTimer(nIDEvent);
}

void CARQDlg::OnSend() 
{
	// TODO: Add your control notification handler code here
	UpdateData(true);
	CString text;
	text.Format("%d个帧被送入发送队列\r\n",m_size);
	m_eveSend=text;
	queue=m_size;
	text.Format("现在队列中有%d个帧\r\n",queue);
	m_eveSend+=text;
	m_eveRecv="";
	vs=vr=0;
	curr=0;
	time=0;
	ToBuffer();
	UpdateData(false);
	
}

void CARQDlg::ToBuffer()//将帧读入缓冲区
{
	if (queue==0) 
	{
		CString text;
		text.Format("发送完成\r\n");
		m_eveSend+=text;
		text.Format("发送完成，共发%d个帧，用时%dms\r\n",curr,time);
		m_buff=text;
		MessageBox(text);
		text.Format("平均用时%fms／帧",(float)time/(float)curr);
		m_buff+=text;
		MessageBox(text);

		UpdateData(false);
		time=0;
		curr=0;			
	}
	else
	{
		curr++;
		queue--;
		CString text;
		text.Format("当前缓冲区中为第%d帧，还有%d帧要发\r\n",curr,queue);
		m_buff=text;
		UpdateData(false);
		SendFrame();
	}
}

void CARQDlg::SendFrame()
{
	CString text;
	text.Format("发送第%d帧，帧序号为%d\r\n",curr,vs);
	m_eveSend+=text;
	UpdateData(false);
	SetTimer(WM_TIMEOUT,setting.m_timeout,NULL);
	int p=rand();
	if (p%100>setting.m_missing) {
		time+=setting.m_tl;
		SetTimer(WM_RECEIVE,setting.m_tl,NULL);
	}
}

void CARQDlg::OnACK()
{
	CString text;
	text.Format("接收到ACK帧，准备发下一帧\r\n");
	m_eveSend+=text;
	time+=setting.m_tr;
	vs=(vs+1)%2;
	KillTimer(WM_TIMEOUT);
	UpdateData(false);
	SetTimer(WM_TOBUFFER,setting.m_tr,NULL);
}

void CARQDlg::OnNAK()
{
	CString text;
	text.Format("接收到NAK帧，准备重发\r\n");
	m_eveSend+=text;
	time+=setting.m_tr;
	SetTimer(WM_SENDFRAME,setting.m_tr,NULL);
	KillTimer(WM_TIMEOUT);
	SendFrame();
	UpdateData(false);
}

void CARQDlg::OnTimeOut()
{
	CString text;
	text.Format("计时器超时，准备重发\r\n");
	m_eveSend+=text;
	SendFrame();
	UpdateData(false);
}

void CARQDlg::OnRecv()
{
	CString text;
	text.Format("接收到第%d帧，帧序号为%d\r\n",curr,vs);
	m_eveRecv+=text;
	int p=rand();
	if (p%100>setting.m_error&&vs==vr) //so luck,no damage!
	{
		text.Format("很幸运，%d帧完好无损，被送往网络层\r\n",curr);
		m_eveRecv+=text;
		time+=setting.m_tp;
		vr=(vr+1)%2;
		SetTimer(WM_SENDACK,setting.m_tp,NULL);
	}
	else 
	{
		if (vs==vr) {
			text.Format("第%d帧损坏 \r\n",curr);
			m_eveRecv+=text;
			time+=setting.m_tp;
			SetTimer(WM_SENDNAK,setting.m_tp,NULL);
		}
		else
		{
			text.Format("错误的序列号%d，该帧被丢弃\r\n",vs);
			m_eveRecv+=text;
			time+=setting.m_tp;
			SetTimer(WM_SENDACK,setting.m_tp,NULL);
		}
	}
	UpdateData(false);
}

void CARQDlg::SendACK()
{
	CString text;
	text.Format("发送ACK\r\n");
	m_eveRecv+=text;
	time+=setting.m_ts;
	int p=rand();
	if (p%100>setting.m_missing) {
		time+=setting.m_tl;
		SetTimer(WM_ONACK,setting.m_tl,NULL);
	}
	else
	{
		text.Format("ACK不幸丢失\r\n");
		m_eveRecv+=text;
	}
	UpdateData(false);
}

void CARQDlg::SendNAK()
{
	CString text;
	text.Format("发送NAK\r\n");
	m_eveRecv+=text;
	int p=rand();
	if (p%100>setting.m_missing) {
		time+=setting.m_tl;
		SetTimer(WM_ONNAK,setting.m_tl,NULL);
	}
	else
	{
		text.Format("NAK不幸丢失\r\\n");
		m_eveRecv+=text;
	}
	UpdateData(false);
}