Delphi tutorial Client server application

 Delphi tutorial   Client server application

This is Delphi Tutorial about client-server application.



Here is video tutorial :

and here is source code :

(code style formatted by http://hilite.me/ )


Source code for client app :

unit MainForm;

interface

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

type
TForm1 = class(TForm) Edit1: TEdit; Edit2: TEdit; Label1: TLabel; Label2: TLabel; GroupBox1: TGroupBox; CheckBox1: TCheckBox; Label3: TLabel; Label4: TLabel; Edit3: TEdit; Edit4: TEdit; Edit5: TEdit; Button1: TButton; Button2: TButton; Memo1: TMemo; ClientSocket1: TClientSocket; procedure Button1Click(Sender: TObject); procedure Button2Click(Sender: TObject); procedure ClientSocket1Connect(Sender: TObject; Socket: TCustomWinSocket); procedure ClientSocket1Disconnect(Sender: TObject; Socket: TCustomWinSocket); procedure ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
private { Private declarations }
public { Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
ClientSocket1.Active:=False;
ClientSocket1.Host:=Edit1.Text;
ClientSocket1.Port:=StrToInt(Edit2.Text)
;
ClientSocket1.Active:=True;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
ClientSocket1.Socket.SendText(Edit5.Text);
Memo1.Lines.Add('Me : '+edit5.Text);
end;

procedure TForm1.ClientSocket1Connect(Sender: TObject;
Socket: TCustomWinSocket);
begin
CheckBox1.Checked:=Socket.Connected;
Edit3.Text:=Socket.LocalAddress;
Edit4.Text:=Socket.LocalHost;
Memo1.Lines.Clear;

end;

procedure TForm1.ClientSocket1Disconnect(Sender: TObject;
Socket: TCustomWinSocket);
begin
CheckBox1.Checked:=Socket.Connected;
end;

procedure TForm1.ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
begin
Memo1.Lines.Add(ClientSocket1.Socket.ReceiveText);
end;

end.
Source code for server app :
unit Main;

interface

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

type
TForm1 = class(TForm) GroupBox1: TGroupBox; GroupBox2: TGroupBox; Label1: TLabel; Label2: TLabel; Label3: TLabel; Label4: TLabel; Label5: TLabel; CheckBox1: TCheckBox; Edit1: TEdit; Button1: TButton; Edit2: TEdit; Edit3: TEdit; Edit4: TEdit; Edit5: TEdit; Edit6: TEdit; Label6: TLabel; Button2: TButton; Memo1: TMemo; ServerSocket1: TServerSocket; procedure Button1Click(Sender: TObject); procedure ServerSocket1Accept(Sender: TObject; Socket: TCustomWinSocket); procedure Button2Click(Sender: TObject); procedure ServerSocket1ClientRead(Sender: TObject; Socket: TCustomWinSocket);
private { Private declarations }
public { Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
port:Integer;
begin
ServerSocket1.Active:=False;
port:=StrToInt(Edit1.Text);
ServerSocket1.Port:=port;
ServerSocket1.Active:=True;
Edit4.Text:='Listening...';
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
ServerSocket1.Socket.Connections[0].SendText(Edit6.Text);
Memo1.Lines.Add('Me : '+Edit6.Text);
Edit6.Text:='';
end;

procedure TForm1.ServerSocket1Accept(Sender: TObject; Socket: TCustomWinSocket);
begin
CheckBox1.Checked:=true;
Edit2.Text:=Socket.RemoteAddress;
Edit3.Text:=Socket.RemoteHost;
Edit5.Text:=Socket.LocalAddress;
Edit4.Text:='Connected';
end;

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

Update 22.03.2018 Source code for Client and Server Forms :

Client Form source code :

unit MainForm;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Edit2: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    GroupBox1: TGroupBox;
    CheckBox1: TCheckBox;
    Label3: TLabel;
    Label4: TLabel;
    Edit3: TEdit;
    Edit4: TEdit;
    Edit5: TEdit;
    Button1: TButton;
    Button2: TButton;
    Memo1: TMemo;
    ClientSocket1: TClientSocket;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure ClientSocket1Connect(Sender: TObject; Socket: TCustomWinSocket);
    procedure ClientSocket1Disconnect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
ClientSocket1.Active:=False;
ClientSocket1.Host:=Edit1.Text;
ClientSocket1.Port:=StrToInt(Edit2.Text);
ClientSocket1.Active:=True;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
ClientSocket1.Socket.SendText(Edit5.Text);
Memo1.Lines.Add('Me : '+edit5.Text);
end;

procedure TForm1.ClientSocket1Connect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
CheckBox1.Checked:=Socket.Connected;
Edit3.Text:=Socket.LocalAddress;
Edit4.Text:=Socket.LocalHost;
Memo1.Lines.Clear;

end;

procedure TForm1.ClientSocket1Disconnect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
CheckBox1.Checked:=Socket.Connected;
end;

procedure TForm1.ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
begin
Memo1.Lines.Add(ClientSocket1.Socket.ReceiveText);
end;

end.

Server Form source code :

unit Main;

interface

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

type
  TForm1 = class(TForm)
    GroupBox1: TGroupBox;
    GroupBox2: TGroupBox;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    CheckBox1: TCheckBox;
    Edit1: TEdit;
    Button1: TButton;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Edit5: TEdit;
    Edit6: TEdit;
    Label6: TLabel;
    Button2: TButton;
    Memo1: TMemo;
    ServerSocket1: TServerSocket;
    procedure Button1Click(Sender: TObject);
    procedure ServerSocket1Accept(Sender: TObject; Socket: TCustomWinSocket);
    procedure Button2Click(Sender: TObject);
    procedure ServerSocket1ClientRead(Sender: TObject;
      Socket: TCustomWinSocket);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
port:Integer;
begin
ServerSocket1.Active:=False;
port:=StrToInt(Edit1.Text);
ServerSocket1.Port:=port;
ServerSocket1.Active:=True;
Edit4.Text:='Listening...';
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
ServerSocket1.Socket.Connections[0].SendText(Edit6.Text);
Memo1.Lines.Add('Me : '+Edit6.Text);
Edit6.Text:='';
end;

procedure TForm1.ServerSocket1Accept(Sender: TObject; Socket: TCustomWinSocket);
begin
CheckBox1.Checked:=true;
Edit2.Text:=Socket.RemoteAddress;
Edit3.Text:=Socket.RemoteHost;
Edit5.Text:=Socket.LocalAddress;
Edit4.Text:='Connected';
end;

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

end.