u_client.pas

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unit U_Client;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ScktComp, StdCtrls, IdBaseComponent, IdComponent, IdUDPBase,
  IdUDPClient, ExtCtrls;

type
  TForm1 = class(TForm)
    ClientSocket: TClientSocket;
    Button1: TButton;
    MemReadMsg: TMemo;
    IdUDPClient1: TIdUDPClient;
    btnSend: TButton;
    MemSendMsg: TMemo;
    Label2: TLabel;
    Label1: TLabel;
    Panel1: TPanel;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
    procedure ClientSocketRead(Sender: TObject; Socket: TCustomWinSocket);
    procedure btnSendClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  Try
    ClientSocket.Active := true;
  Except
    MessageBox(0,'连接失败，请查看服务端是否有启动！','',MB_OK + MB_ICONWARNING);
  end;  
end;

procedure TForm1.ClientSocketRead(Sender: TObject;
  Socket: TCustomWinSocket);
var
  len:word;
  buf:array of char;
  msg:string;
begin
  try
    Socket.ReceiveBuf(len, 2);
    if len < 1 then Exit;
    setlength(buf, len);
    Socket.ReceiveBuf(buf[0], len);
    //msg:=copy(buf, 0, len);
    setlength(msg, len);
    Move(buf[0], msg[1], len);
    MemReadMsg.Lines.Add(msg);
  except
  end;

end;

{procedure TForm1.Button2Click(Sender: TObject);
var
  tmp:string;
begin
  tmp :=Trim(Memo2.Text);
  try
    IdUDPClient1.Active := true;
    IdUDPClient1.Send(tmp);
  except
  end;
end;}

procedure TForm1.btnSendClick(Sender: TObject);
Var
  len : Word;
  Msg : String;
  buf : array of char;
begin //前两个字节存放消息体内容长度
  Msg := Trim(MemSendMsg.Text);
  Len := Length(Msg);
  SetLength(buf,Len + 2);
  Move(Len,buf[0],2);
  Move(Msg[1],buf[2],Len);
  ClientSocket.Socket.SendBuf(buf[0],Len + 2)
end;
{begin
  ClientSocket.Socket.SendText(Trim(MemSendMsg.Text))
end;}

end.