procedure TUDPMainForm.UDPServerUDPRead(Sender: TObject; AData: TStream; ABinding: TIdSocketHandle);
var
DataStringStream: TStringStream;
s: String;
begin
DataStringStream := TStringStream.Create('');
try
DataStringStream.CopyFrom(AData, AData.Size);
UDPMemo.Lines.Add('Received "' + DataStringStream.DataString + '" from ' + ABinding.PeerIP + ' on port ' + IntToStr(ABinding.PeerPort));
s := 'Replied from ' + UDPServer.LocalName + ' to "' + DataStringStream.DataString + '"';
//下边这句就是服务端向客户端发送信息。。。
ABinding.SendTo(ABinding.PeerIP, ABinding.PeerPort, s[1], Length(s));
finally
DataStringStream.Free;
end;
end;
]