simple demo
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program Project1;
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uses
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Vcl.Forms,
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Unit1 in 'Unit1.pas' {Form1},
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superobject in '..\superobject\superobject.pas';
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{$R *.res}
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begin
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Application.Initialize;
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Application.MainFormOnTaskbar := True;
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Application.CreateForm(TForm1, Form1);
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Application.Run;
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end.
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object Form1: TForm1
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Left = 0
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Top = 0
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Caption = 'Form1'
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ClientHeight = 337
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ClientWidth = 635
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Color = clBtnFace
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Font.Charset = DEFAULT_CHARSET
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Font.Color = clWindowText
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Font.Height = -11
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Font.Name = 'Tahoma'
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Font.Style = []
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OldCreateOrder = False
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PixelsPerInch = 96
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TextHeight = 13
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object Button1: TButton
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Left = 8
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Top = 8
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Width = 75
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Height = 25
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Caption = 'Button1'
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TabOrder = 0
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OnClick = Button1Click
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end
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object Button2: TButton
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Left = 8
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Top = 39
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Width = 75
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Height = 25
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Caption = 'Button2'
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TabOrder = 1
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OnClick = Button2Click
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end
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object Timer1: TTimer
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Enabled = False
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Interval = 5000
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OnTimer = Timer1Timer
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Left = 128
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Top = 16
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end
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end
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unit Unit1;
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interface
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uses
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Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
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Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls,
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IdServerWebsocketContext;
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type
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TForm1 = class(TForm)
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Button1: TButton;
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Timer1: TTimer;
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Button2: TButton;
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procedure Button1Click(Sender: TObject);
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procedure Timer1Timer(Sender: TObject);
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procedure Button2Click(Sender: TObject);
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private
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procedure ServerMessageTextReceived(const AContext: TIdServerWSContext; const aText: string);
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procedure ClientBinDataReceived(const aData: TStream);
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public
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end;
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var
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Form1: TForm1;
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implementation
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{$R *.dfm}
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uses
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IdWebsocketServer, IdHTTPWebsocketClient, superobject, IdSocketIOHandling,
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IdIOHandlerWebsocket;
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var
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server: TIdWebsocketServer;
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client: TIdHTTPWebsocketClient;
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const
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C_CLIENT_EVENT = 'CLIENT_TO_SERVER_EVENT_TEST';
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C_SERVER_EVENT = 'SERVER_TO_CLIENT_EVENT_TEST';
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procedure ShowMessageInMainthread(const aMsg: string) ;
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begin
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TThread.Synchronize(nil,
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procedure
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begin
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ShowMessage(aMsg);
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end);
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end;
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procedure TForm1.Button1Click(Sender: TObject);
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begin
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server := TIdWebsocketServer.Create(Self);
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server.DefaultPort := 12345;
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server.SocketIO.OnEvent(C_CLIENT_EVENT,
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procedure(const ASocket: ISocketIOContext; const aArgument: TSuperArray; const aCallback: ISocketIOCallback)
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begin
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//show request (threadsafe)
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ShowMessageInMainthread('REQUEST: ' + aArgument[0].AsJSon);
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//send callback (only if specified!)
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if aCallback <> nil then
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aCallback.SendResponse( SO(['succes', True]).AsJSon );
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end);
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server.Active := True;
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client := TIdHTTPWebsocketClient.Create(Self);
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client.Port := 12345;
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client.Host := 'localhost';
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client.SocketIOCompatible := True;
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client.SocketIO.OnEvent(C_SERVER_EVENT,
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procedure(const ASocket: ISocketIOContext; const aArgument: TSuperArray; const aCallback: ISocketIOCallback)
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begin
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ShowMessageInMainthread('Data PUSHED from server: ' + aArgument[0].AsJSon);
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//server wants a response?
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if aCallback <> nil then
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aCallback.SendResponse('thank for the push!');
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end);
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client.Connect;
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client.SocketIO.Emit(C_CLIENT_EVENT, SO([ 'request', 'some data']),
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//provide callback
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procedure(const ASocket: ISocketIOContext; const aJSON: ISuperObject; const aCallback: ISocketIOCallback)
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begin
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//show response (threadsafe)
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ShowMessageInMainthread('RESPONSE: ' + aJSON.AsJSon);
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end);
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//start timer so server pushes (!) data to all clients
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Timer1.Interval := 5 * 1000; //5s
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// Timer1.Enabled := True;
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end;
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procedure TForm1.Button2Click(Sender: TObject);
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begin
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server := TIdWebsocketServer.Create(Self);
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server.DefaultPort := 12346;
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server.Active := True;
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client := TIdHTTPWebsocketClient.Create(Self);
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client.Port := 12346;
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client.Host := 'localhost';
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client.Connect;
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client.UpgradeToWebsocket;
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client.OnBinData := ClientBinDataReceived;
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server.OnMessageText := ServerMessageTextReceived;
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client.IOHandler.Write('test');
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end;
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procedure TForm1.ClientBinDataReceived(const aData: TStream);
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begin
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//
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end;
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procedure TForm1.ServerMessageTextReceived(const AContext: TIdServerWSContext; const aText: string);
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var
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strm: TStringStream;
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begin
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ShowMessageInMainthread('WS REQUEST: ' + aText);
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strm := TStringStream.Create('SERVER: ' + aText);
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AContext.IOHandler.Write(strm, wdtBinary);
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end;
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procedure TForm1.Timer1Timer(Sender: TObject);
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begin
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Timer1.Enabled := false;
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server.SocketIO.EmitEventToAll(C_SERVER_EVENT, SO(['data', 'pushed from server']),
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procedure(const ASocket: ISocketIOContext; const aJSON: ISuperObject; const aCallback: ISocketIOCallback)
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begin
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//show response (threadsafe)
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TThread.Synchronize(nil,
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procedure
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begin
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ShowMessage('RESPONSE from a client: ' + aJSON.AsJSon);
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end);
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end);
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end;
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end.
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