====== Threaded ServerSocket ======

This Example was found at [[http://www.duketown.com/marcel/server.shtml]]

<code delphi>
program server;

uses
  Forms,
  main in 'main.pas' {Form1};

{$R *.RES}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.
</code>

<code delphi>
Unit main;

Interface

Uses
  Windows, SysUtils, Messages, Classes, Forms, ScktComp, Controls, StdCtrls,
  Menus, Mask, Spin, ComCtrls, ExtCtrls;

Const
  CM_IncCount = WM_USER + 1;

Type
  TForm1 = Class(TForm)
    ServerSocket: TServerSocket;
    MainMenu: TMainMenu;
    File1: TMenuItem;
    ActiveItem: TMenuItem;
    N1: TMenuItem;
    Exit1: TMenuItem;
    Panel1: TPanel;
    Label1: TLabel;
    CacheEdit: TSpinEdit;
    Label2: TLabel;
    PortEdit: TSpinEdit;
    Label3: TLabel;
    ThreadCount: TEdit;
    Panel2: TPanel;
    ListBox1: TListBox;
    Panel3: TPanel;
    StatusBar1: TStatusBar;
    CharCount: TLabel;
    Procedure ServerSocketGetThread(Sender: TObject;
      ClientSocket: TServerClientWinSocket;
      Var SocketThread: TServerClientThread);
    Procedure FormCreate(Sender: TObject);
    Procedure FormClose(Sender: TObject; Var Action: TCloseAction);
    Procedure Exit1Click(Sender: TObject);
    Procedure PortEditChange(Sender: TObject);
    Procedure ActiveItemClick(Sender: TObject);
    Procedure ServerSocketThreadEnd(Sender: TObject;
      Thread: TServerClientThread);
    Procedure ServerSocketThreadStart(Sender: TObject;
      Thread: TServerClientThread);
    Procedure CacheEditChange(Sender: TObject);
  protected
    Procedure CMIncCount(Var Msg: TMessage); message CM_IncCount;
  public
  End;

{ TFileServerThread }

  TFileServerThread = Class(TServerClientThread)
  public
    Procedure ClientExecute; override;
  End;

Var
  Form1: TForm1;

Implementation

{$R *.DFM}

{ TFileServerThread }

Procedure TFileServerThread.ClientExecute;
Var
  Data: Array[0..1023] Of char;
  RecText: String;
  SocketStream: TWinSocketStream;
Begin
  While Not Terminated And ClientSocket.Connected Do
  Try
    SocketStream := TWinSocketStream.Create(ClientSocket, 30000);
    Try
      FillChar(Data, SizeOf(Data), 0);
      If SocketStream.Read(Data, SizeOf(Data)) = 0 Then
      Begin
        // If we didn't get any data after xx seconds then close the connection
        ClientSocket.SendText('Timeout on Server'+#13#10);
        //Wait a little time to allow sending of text before disconnect
        sleep(1);
        ClientSocket.Close;
        Terminate;
      End;
      RecText := Data;
      If Length(RecText) > 2 Then
        Delete(RecText, Pos(#13#10, RecText), 2); // Delete 10
      If ClientSocket.Connected Then
      Begin
        ClientSocket.SendText(RecText);
        SendMessage(Form1.Listbox1.Handle, LB_ADDSTRING, 0, Integer(PChar(RecText)));
        PostMessage(Form1.Handle, CM_INCCOUNT, 0, 0);
      End;
    Finally
      SocketStream.Free;
    End;
  Except
    HandleException;
  End;
End;

Procedure TForm1.ServerSocketGetThread(Sender: TObject;
  ClientSocket: TServerClientWinSocket;
  Var SocketThread: TServerClientThread);
Begin
  // Create a new thread for connection
  SocketThread := TFileServerThread.Create(False, ClientSocket);
  ClientSocket.SendText('Welcome to Server'+#13#10);
End;

Procedure TForm1.FormCreate(Sender: TObject);
Begin
  CacheEdit.Value := ServerSocket.ThreadCacheSize;
  PortEdit.Value := ServerSocket.Port;
  CharCount.Caption := '0';
  ActiveItemClick(Nil);
End;

Procedure TForm1.FormClose(Sender: TObject; Var Action: TCloseAction);
Begin
  ServerSocket.Close;
End;

Procedure TForm1.CMIncCount(Var Msg: TMessage);
Begin
  CharCount.Caption := IntToStr(StrToInt(CharCount.Caption) + 1);
End;

Procedure TForm1.Exit1Click(Sender: TObject);
Begin
  Close;
End;

Procedure TForm1.PortEditChange(Sender: TObject);
Begin
  ServerSocket.Port := StrToInt(PortEdit.Text);
End;

Procedure TForm1.ActiveItemClick(Sender: TObject);
Begin
  ServerSocket.Active := Not ServerSocket.Active;
  ActiveItem.Checked := ServerSocket.Active;
  If ServerSocket.Active Then
    StatusBar1.SimpleText := 'Active'
  Else
    StatusBar1.SimpleText := 'InActive';
End;

Procedure TForm1.ServerSocketThreadEnd(Sender: TObject;
  Thread: TServerClientThread);
Begin
  ThreadCount.Text := IntToStr(StrToInt(ThreadCount.Text) - 1);
End;

Procedure TForm1.ServerSocketThreadStart(Sender: TObject;
  Thread: TServerClientThread);
Begin
  ThreadCount.Text := IntToStr(StrToInt(ThreadCount.Text) + 1);
End;

Procedure TForm1.CacheEditChange(Sender: TObject);
Begin
  ServerSocket.ThreadCacheSize := CacheEdit.Value;
End;

End.
</code>