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procedure TForm1.Button1Click(Sender: TObject);
begin
  Clientsocket1.Host:=edit1.Text; {in edit1 gibt der client meine ip ein}
  clientsocket1.Open;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  if (clientsocket1.Active=true) and (Edit2.Text<>'') then
  begin
    clientsocket1.Socket.SendText(Edit1.text);
    edit1.text:='';
  end;  
end;

procedure TForm1.ClientSocket1Read(Sender: TObject;
  Socket: TCustomWinSocket);
begin
  Memo1.lines.Add(socket.ReceiveText);
end;					

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procedure TForm1.ServerSocket1ClientRead(Sender: TObject;
  Socket: TCustomWinSocket);
begin
  memo1.Lines.Add(socket.ReceiveText);
end;

procedure TForm1.Button1Click(Sender: TObject);
var i:integer;
begin
  for i:=0 to serversocket1.Socket.ActiveConnections-1 do
  begin
    with serversocket1.Socket.Connections[i] do
    if (connected) then Sendtext(edit1.Text);
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  serversocket1.Open; {ja, diesen button click ich vorher an}
end;					

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    ServerSocket1: TServerSocket;
    Timer1: TTimer;
    CheckBox1: TCheckBox;
    procedure FormCreate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure ServerSocket1ClientRead(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure Timer1Timer(Sender: TObject);
    procedure CheckBox1Click(Sender: TObject);
    procedure ServerSocket1ClientError(Sender: TObject;
      Socket: TCustomWinSocket; ErrorEvent: TErrorEvent;
      var ErrorCode: Integer);
    procedure ServerSocket1ClientConnect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure ServerSocket1ClientDisconnect(Sender: TObject;
      Socket: TCustomWinSocket);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  ServerSocket1.Active := TRUE;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  ServerSocket1.Active := FALSE;
end;

procedure TForm1.ServerSocket1ClientRead(Sender: TObject; Socket: TCustomWinSocket);
begin
  Memo1.Lines.Add(Socket.RemoteAddress+': '+Socket.ReceiveText);
end;

procedure TForm1.Timer1Timer(Sender: TObject);
  var
    i: Integer;
begin
  if (CheckBox1.Checked) then
    begin
      for i := 0 to ServerSocket1.Socket.ActiveConnections-1 do
        if (ServerSocket1.Socket.Connections[i].Connected) then
          ServerSocket1.Socket.Connections[i].SendText(TimeToStr(Time()));
      Timer1.Interval := 1000;
    end;
end;

procedure TForm1.CheckBox1Click(Sender: TObject);
begin
  if (Timer1.Interval = 0) then
    Timer1.Interval := 1000
  else
    Timer1.Interval := 0;
end;

procedure TForm1.ServerSocket1ClientError(Sender: TObject; Socket: TCustomWinSocket; ErrorEvent: TErrorEvent; var ErrorCode: Integer);
  var
    etxt: ShortString;
    i: Integer;
begin
  etxt := '???';
  if (ErrorEvent = eeGeneral) then
    etxt := 'eeGeneral'
  else if (ErrorEvent = eeSend) then
    etxt := 'eeSend'
  else if (ErrorEvent = eeReceive) then
    etxt := 'eeReceive'
  else if (ErrorEvent = eeConnect) then
    etxt := 'eeConnect'
  else if (ErrorEvent = eeDisconnect) then
    etxt := 'eeDisconnect'
  else if (ErrorEvent = eeAccept) then
    etxt := 'eeAccept';
  if (Socket.Connected) then
    for i := 0 to ServerSocket1.Socket.ActiveConnections-1 do
      if (Socket = ServerSocket1.Socket.Connections[i]) then
        ServerSocket1.Socket.Connections[i].Close;
  if (CheckBox1.Checked) then
    Timer1.Interval := 1000;
  ShowMessage('ErrorCode: '+IntToStr(ErrorCode)+#13+
              'ErrorEvent: '+etxt);
  ErrorCode := 0;
end;

procedure TForm1.ServerSocket1ClientConnect(Sender: TObject; Socket: TCustomWinSocket);
begin
  Memo1.Lines.Add('Client connected: '+Socket.RemoteAddress);
end;

procedure TForm1.ServerSocket1ClientDisconnect(Sender: TObject; Socket: TCustomWinSocket);
begin
  Memo1.Lines.Add('Client disconnected: '+Socket.RemoteAddress);
end;

end.					

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    ClientSocket1: TClientSocket;
    Edit2: TEdit;
    procedure FormCreate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure Button1Click(Sender: TObject);
    procedure ClientSocket1Error(Sender: TObject; Socket: TCustomWinSocket;
      ErrorEvent: TErrorEvent; var ErrorCode: Integer);
    procedure ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
    procedure ClientSocket1Disconnect(Sender: TObject;
      Socket: TCustomWinSocket);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  is_running: Boolean;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  ClientSocket1.Host := '192.168.0.3';
  ClientSocket1.Active := TRUE;
  is_running := TRUE;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  is_running := FALSE;
  ClientSocket1.Active := FALSE;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if (ClientSocket1.Active) then
    ClientSocket1.Socket.SendText(Edit1.Text);
end;

procedure TForm1.ClientSocket1Error(Sender: TObject; Socket: TCustomWinSocket; ErrorEvent: TErrorEvent; var ErrorCode: Integer);
  var
    etxt: ShortString;
begin
  etxt := '???';
  if (ErrorEvent = eeGeneral) then
    etxt := 'eeGeneral'
  else if (ErrorEvent = eeSend) then
    etxt := 'eeSend'
  else if (ErrorEvent = eeReceive) then
    etxt := 'eeReceive'
  else if (ErrorEvent = eeConnect) then
    etxt := 'eeConnect'
  else if (ErrorEvent = eeDisconnect) then
    etxt := 'eeDisconnect'
  else if (ErrorEvent = eeAccept) then
    etxt := 'eeAccept';
  if ((ErrorEvent = eeConnect) or (ErrorEvent = eeDisconnect)) then
    begin
      ShowMessage('Server antwortet nicht!?');
      Application.Terminate;
    end
  else
    ShowMessage('ErrorCode: '+IntToStr(ErrorCode)+#13+
                'ErrorEvent: '+etxt);
  ErrorCode := 0;
end;

procedure TForm1.ClientSocket1Read(Sender: TObject;
  Socket: TCustomWinSocket);
begin
  Edit2.Text := Socket.ReceiveText;
end;

procedure TForm1.ClientSocket1Disconnect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
  if (is_running) then
   begin
     ShowMessage('Server hat aufgelegt!');
     Application.Terminate;
   end;
end;

end.