在开始之前我们需要了解下这个Demo功能是啥

我们可以看到这是两个小project,左边的project有服务端和客户端1，右边的project只有一个客户端2

效果就是当两个客户端各自分别输入正确的IP地址和PORT端口，然后btconnect连接就可以连接到这个服务端

然后就可以发送消息，服务端的Memo1可以显示来自客户端发送信息的内容。

另外服务端也可以发送消息给两个客户端，做到双向传递信息。

两个客户端发送信息给服务端：

服务端接收消息反馈给客户端：

做的很粗糙，但是大概功能算是实现了

具体做法：

第一步、

建立一个Project新建From1拖入如下控件TServerSocket,TClientSocket,TMemo2个,Label四个,TEdit两个

TButton四个,TStatusBar。然后设置属性，ServerSocket1的Action为True；ServerSocket1的Port为1025

代码如下：

unit Unit1;


interface


uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, ScktComp;


type
  TForm1 = class(TForm)
    ClientSocket1: TClientSocket;
    ServerSocket1: TServerSocket;
    Memo2: TMemo;
    StatusBar1: TStatusBar;
    Edit1: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Edit2: TEdit;
    btnConnect: TButton;
    btnSent: TButton;
    btnDisconnect: TButton;
    Button1: TButton;
    Memo1: TMemo;
    Label3: TLabel;
    Label4: TLabel;
    procedure ServerSocket1ClientConnect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure ServerSocket1ClientDisconnect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure ServerSocket1ClientRead(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure Button1Click(Sender: TObject);
    procedure ClientSocket1Connect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure btnConnectClick(Sender: TObject);
    procedure btnDisconnectClick(Sender: TObject);
    procedure btnSentClick(Sender: TObject);
    procedure ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
  private
    { Private declarations }
  public
    { Public declarations }
  end;


var
  Form1: TForm1;


implementation


{$R *.dfm}

////////////////////////////////////////////////////////////////////////服务端代码////////////////////////////////////////////////////////////////////////////////////////
procedure TForm1.ServerSocket1ClientConnect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
StatusBar1.SimpleText := 'connect';
end;


procedure TForm1.ServerSocket1ClientDisconnect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
  StatusBar1.SimpleText := 'disconnect';
end;


procedure TForm1.ServerSocket1ClientRead(Sender: TObject;
  Socket: TCustomWinSocket);
begin
 Memo1.Lines.Add('悄悄的对你说'+ Socket.ReceiveText);
end;


procedure TForm1.Button1Click(Sender: TObject);
var i:integer;
begin

    for i:=0 to ServerSocket1.Socket.ActiveConnections-1 do
    Serversocket1.socket.connections[i].SendText(Memo1.Text);//服务端向客户端发送信息

end;

////////////////////////////////////////////////////////////////////////客户端代码////////////////////////////////////////////////////////////////////////////////////////
procedure TForm1.ClientSocket1Connect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
StatusBar1.SimpleText:='连接成功';//状态栏显示状态
end;


procedure TForm1.btnConnectClick(Sender: TObject);//输入IP和PORT连接
begin
 if not ClientSocket1.Active then
   begin
     ClientSocket1.Host := Edit1.Text;
     ClientSocket1.Port := StrToInt(Edit2.Text);
     ClientSocket1.Open;
     (Sender as TButton).Enabled := false;
      btnDisconnect.Enabled := true;
     end;
end;


procedure TForm1.btnDisconnectClick(Sender: TObject);//断开连接
begin
if ClientSocket1.Active then
   begin
     ClientSocket1.Close;
     btnDisconnect.Enabled := false;
     btnConnect.Enabled := true;
   end;
end;


procedure TForm1.btnSentClick(Sender: TObject);//连接成功后发送数据给服务端
begin
 if ClientSocket1.Active then
    ClientSocket1.Socket.SendText(Memo2.Text)
end;


procedure TForm1.ClientSocket1Read(Sender: TObject;
  Socket: TCustomWinSocket);//客户端监听来自服务端的数据
begin
Memo2.Lines.Add(Socket.ReceiveText);
end;


end.

第二步、

再新建一个project作为客户端2 建立Form1拖入控件TClientSocket,TMemo,TEdit两个,Label三个,TButton三个,TStatusBar

代码如下：

unit Unit1;


interface


uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls, StdCtrls, ScktComp;


type
  TForm1 = class(TForm)
    ClientSocket1: TClientSocket;
    Memo2: TMemo;
    Edit1: TEdit;
    Edit2: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    btnConnect: TButton;
    StatusBar1: TStatusBar;
    btnSent: TButton;
    btnDisconnect: TButton;
    Label3: TLabel;
    procedure ClientSocket1Connect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure btnConnectClick(Sender: TObject);
    procedure btnDisconnectClick(Sender: TObject);
    procedure btnSentClick(Sender: TObject);
    procedure ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
  private
    { Private declarations }
  public
    { Public declarations }
  end;


var
  Form1: TForm1;


implementation


{$R *.dfm}


procedure TForm1.ClientSocket1Connect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
StatusBar1.SimpleText:='连接成功';
end;


procedure TForm1.btnConnectClick(Sender: TObject);
begin
 if not ClientSocket1.Active then
   begin
     ClientSocket1.Host := Edit1.Text;
     ClientSocket1.Port := StrToInt(Edit2.Text);
     ClientSocket1.Open;
     (Sender as TButton).Enabled := false;
      btnDisconnect.Enabled := true;
     end;
end;


procedure TForm1.btnDisconnectClick(Sender: TObject);
begin
if ClientSocket1.Active then
   begin
     ClientSocket1.Close;
     btnDisconnect.Enabled := false;
     btnConnect.Enabled := true;
   end;
end;


procedure TForm1.btnSentClick(Sender: TObject);
begin
if ClientSocket1.Active then
    ClientSocket1.Socket.SendText(Memo2.Text)
end;


procedure TForm1.ClientSocket1Read(Sender: TObject;
  Socket: TCustomWinSocket);
begin
Memo2.Lines.Add(Socket.ReceiveText);
end;


end.

http://blog.csdn.net/s371795639/article/details/53976864