udtsenddlg.cpp

使用UDP模拟可靠传输协议rdt2.0。使用两个程序

// UDTSendDlg.cpp : implementation file
//

#include "stdafx.h"
#include "UDTSend.h"
#include "UDTSendDlg.h"
#include "cmmdef.h"
#include <vector>

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

static std::vector<SNDPKT> vsnd;
static int minWaiting,minSend;
static int nAckCt,nErrct;
//数据区
static char databuf[1024];
static int datasz;

const int N=20;
void CUDTSendDlg::StartSend()
{
	if(vsnd.empty()) return;
	minWaiting=minSend=0;
	SetTimer(TIMER_SRV_SEND,SRV_SEND_TM,NULL);
	nAckCt=nErrct=0;
	//SetTimer(TIMER_SRV_ACKWAIT,SRV_ACKWAIT_TM);
	//xianshi
	CString txt,str;  m_info.GetWindowText(txt);
	str.Format("PKTs send start..\tn=%d\r\n",vsnd.size());
	txt+=str;
	m_info.SetWindowText(txt); 
}

void CUDTSendDlg::sendPkt(int pktid)
{
	CString txt,str;  m_info.GetWindowText(txt);
	if(pktid<0||pktid>=vsnd.size())
	{
		str.Format("Error sendPkt:(id=%d)\r\n",pktid);
		return ;
	}
	SNDPKT* pPkt=&vsnd[pktid];
	CString send_ip;
	BYTE f1,f2,f3,f4;
	m_ip.GetAddress(f1,f2,f3,f4);
	
	send_ip.Format("%d.%d.%d.%d",f1,f2,f3,f4);
	if(sndSock.SendTo(pPkt,sizeof(SNDPKT),PORT_CLI,send_ip,0)==SOCKET_ERROR)
	{
		TRACE0("Error on send");
		return ;
	}
	//minSend=pktid;
	SetTimer(TIMER_SRV_ACKWAIT,SRV_ACKWAIT_TM,NULL);
	//nAckCt=0;
	//msg
	
	str.Format("To(%s):PKTid=%d--Send\r\n",send_ip,pPkt->id);
	txt+=str;
	m_info.SetWindowText(txt);  m_info.LineScroll(m_info.GetLineCount());
}

/////////////////////////////////////////////////////////////////////////////
// CUDTSendDlg dialog

CUDTSendDlg::CUDTSendDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CUDTSendDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CUDTSendDlg)
		// 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 CUDTSendDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CUDTSendDlg)
	DDX_Control(pDX, IDC_IPADDRESS, m_ip);
	DDX_Control(pDX, IDC_EDIT_MSG, m_msgtxt);
	DDX_Control(pDX, IDC_EDIT_INFO, m_info);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CUDTSendDlg, CDialog)
	//{{AFX_MSG_MAP(CUDTSendDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BTN_SEND, OnBtnSend)
	ON_WM_TIMER()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CUDTSendDlg message handlers

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

	// 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
	AfxSocketInit();
	m_ip.SetAddress(127,0,0,1);
	if(!sndSock.Create(PORT_SRV,SOCK_DGRAM)) 
	{
		TRACE0("failed to create sock");
		return FALSE;
	}
	sndSock.SetNotifyWnd(GetSafeHwnd());
	sndSock.SetRcvNotifyMsg(SRV_RCV_MSG);


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

// 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 CUDTSendDlg::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 CUDTSendDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CUDTSendDlg::OnBtnSend() 
{
	// TODO: Add your control notification handler code here
	//MessageBox("s");
	m_msgtxt.GetWindowText(databuf,1024);
	vsnd=makepkts(databuf,strlen(databuf)+1);
	StartSend();
}

LRESULT CUDTSendDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 
{
	// TODO: Add your specialized code here and/or call the base class
	if(message==SRV_RCV_MSG)
	{
		REQPKT rpkt;CString txt,str;  m_info.GetWindowText(txt);
		if(sndSock.Receive(&rpkt,sizeof(REQPKT))==sizeof(REQPKT)&&rpkt.id>=0)
		{ 
	//		nErrct=0;
			
			if(rpkt.id==minWaiting)
			{
				minWaiting++;//确认的成功发送数目+1
				//KillTimer(TIMER_SRV_ACKWAIT);
				nAckCt=0;//重新计时
				str.Format("receive ack:%d\r\n",rpkt.id);txt+=str;
				//importatn---------------------------------
				if(minWaiting==vsnd.size())	//传输结束
				{
					KillTimer(TIMER_SRV_SEND);
					KillTimer(TIMER_SRV_ACKWAIT);
					vsnd.clear();
					
					str="传输结束\r\n"; txt+=str;
				}
			}
			else //丢弃
			{
				str.Format("receive ack(but ignored!):%d\r\n",rpkt.id);txt+=str;
			}
		}

		m_info.SetWindowText(txt);m_info.LineScroll(m_info.GetLineCount());
	}
	return CDialog::WindowProc(message, wParam, lParam);
}

void CUDTSendDlg::OnTimer(UINT nIDEvent) 
{
	// TODO: Add your message handler code here and/or call default
	if(nIDEvent==TIMER_SRV_SEND)
	{
		//发送数据
		sendPkt(minSend); if(minSend<vsnd.size()) minSend++;
		if(minSend-minWaiting>N) nAckCt=10; //back N!
	}
	else if(nIDEvent==TIMER_SRV_ACKWAIT)
	{//ack超时
		if(nAckCt++>10)
		{nAckCt=0;  
			CString txt,str;  m_info.GetWindowText(txt);
			if(nErrct++>12)
			{
				str.Format("无法和client取得联系，传输中断!!\r\n");txt+=str;
				m_info.SetWindowText(txt);m_info.LineScroll(m_info.GetLineCount());  
				KillTimer(TIMER_SRV_SEND);
				KillTimer(TIMER_SRV_ACKWAIT);
				nErrct=0;
			}
			str.Format("ACK超时!当前发送:%d,倒回%d..\r\n",minSend,minWaiting);
			txt+=str;
			m_info.SetWindowText(txt);m_info.LineScroll(m_info.GetLineCount());
			minSend=minWaiting;	//从最后未确认处发送
		}
	}
	CDialog::OnTimer(nIDEvent);
}