客户端：
m_mainsocketUDP=::socket(AF_INET,SOCK_DGRAM,0);
::WSAAsyncSelect(m_mainsocketUDP,m_hWnd,WM_SOCKET,FD_READ|FD_ACCEPT|FD_CLOSE);
...///代码略过
...
...LRESULT CBabyDlg::OnSocket(WPARAM wParam, LPARAM lParam)
{
CString gettext;
CString cut;
CString sqlchat;
int npos;
int len=sizeof(m_mainaddr);
CTime time=CTime::GetCurrentTime();
int hour=time.GetHour();
int minute=time.GetMinute();
int second=time.GetSecond();
switch(LOWORD(lParam)){
case FD_READ:
FlashWindow(TRUE);
char szgettext[1024];
if(wParam==m_mainsocketUDP){
recvfrom(m_mainsocketUDP,szgettext,1024,0,(sockaddr*)&(m_mainaddr),&len);
}
...
...
...////这些代码略过，。。。
sendto(m_mainsocketUDP,"123",3,0,(sockaddr*)&m_mainaddr,sizeof(m_mainaddr));
服务器端：
m_sUDP=::socket(AF_INET,SOCK_DGRAM,0);
sockaddr_in sinaddr;
sinaddr.sin_family=AF_INET;
sinaddr.sin_port=htons(66);
sinaddr.sin_addr.S_un.S_addr=INADDR_ANY;
CString x=inet_ntoa(sinaddr.sin_addr);
if(::bind(m_sUDP,(LPSOCKADDR)&sinaddr,sizeof(sinaddr))==SOCKET_ERROR){
MessageBox("关联C败。。。");
}
::WSAAsyncSelect(m_sUDP,m_hWnd,WM_SOCKET,FD_READ|FD_ACCEPT|FD_CLOSE);
...
...
...
LRESULT CBabyDlg::OnSocket(WPARAM wParam, LPARAM lParam)
{
int size=sizeof(m_laopoaddr);
int npos;
CString gettext;
CString cut;
CString sqlchat;
CTime time=CTime::GetCurrentTime();
int hour=time.GetHour();
int minute=time.GetMinute();
int second=time.GetSecond();
switch (LOWORD(lParam))
{
case FD_ACCEPT:
m_laoposocket=::accept(m_s,(sockaddr*)&m_laopoaddr,&size);
GetDlgItemText(IDC_EDIT1,gettext);
gettext+="\r\n\t已连接上~~";
SetDlgItemText(IDC_EDIT1,gettext);
m_outedit.LineScroll(m_outedit.GetLineCount());
shake();
m_napaccept=1;
m_bconectOK=TRUE;
break;
case FD_READ: ////这个一直出现，无限次。。。。
FlashWindow(TRUE);
char szgettext[1024];
int len;
if(wParam==m_sUDP){
recvfrom(m_sUDP,szgettext,10,0,&m_UDPaddr,&len);
}
else recv(m_laoposocket,szgettext,1024,0);
