UDP

BOOL CUDPDlg::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

 mysocket = socket(AF_INET,SOCK_DGRAM,0);
 if (mysocket == INVALID_SOCKET)
 {
  MessageBox("MySocket failed");
  return FALSE;
 }
 sockaddr_in socketinfo;
 socketinfo.sin_family = AF_INET;
 socketinfo.sin_port = htons(10000);
 socketinfo.sin_addr.S_un.S_addr = htonl(INADDR_ANY);//指定接收对象IP
 bind(mysocket,(sockaddr*)&socketinfo,sizeof(sockaddr_in));
 CreateThread(NULL,0,ThreadRev,&mysocket,NULL,NULL);

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

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

DWORD WINAPI ThreadRev(LPVOID lparam)
{
 CUDPDlg *p = (CUDPDlg*)AfxGetApp()->GetMainWnd();
 SOCKET *mysocket = (SOCKET*) lparam;
 sockaddr_in socketinfo1;
 int size = sizeof(sockaddr_in);
 char *buf = new char[200];
 CString recvip;
 while (1)
 {
  memset(buf,0,200);
  recvfrom(*mysocket,buf,200,0,(sockaddr*)&socketinfo1,&size);
  recvip = inet_ntoa(socketinfo1.sin_addr);
  p->m_edit_show += recvip + " to Me";
  p->m_edit_show += ":";
  p->m_edit_show += buf;
  p->m_edit_show += "/r/n";
  p->SetDlgItemText(IDC_EDIT1,p->m_edit_show);
 } 
 return 0;
}

void CUDPDlg::OnOK()
{
 // TODO: Add extra validation here
 UpdateData(TRUE);
 sockaddr_in socketinfo2;
 if (m_edit_ip == "")
 {
  MessageBox("Input IP");
  return ;
 } 
 socketinfo2.sin_family = AF_INET;
 socketinfo2.sin_port = htons(10000);
 socketinfo2.sin_addr.S_un.S_addr = inet_addr(m_edit_ip);//指定发送对象IP
 if (m_edit_input == "")
 {
  MessageBox("Input message");
  return ;
 }
 sendto(mysocket,m_edit_input,200,0,(sockaddr*)&socketinfo2,sizeof(sockaddr_in));
 m_edit_show += "Me to " + m_edit_ip + ":" + m_edit_input + "/r/n";
 m_edit_input = "";
 UpdateData(FALSE);
}