Not active anymore
Unfortunately I don't have time to support this project anymore. Also the websocket protocol has changed in the meantime, so it won't work with browser and other modern implementations.
Please take a look at the free (but closed) 3rd party component:
DelphiWebsockets
Websockets and Socket.io for Delphi
See below for an event driven async example of an socket.io server and client:
uses
IdWebsocketServer, IdHTTPWebsocketClient, superobject, IdSocketIOHandling;
var
server: TIdWebsocketServer;
client: TIdHTTPWebsocketClient;
const
C_CLIENT_EVENT = 'CLIENT_TO_SERVER_EVENT_TEST';
C_SERVER_EVENT = 'SERVER_TO_CLIENT_EVENT_TEST';
procedure ShowMessageInMainthread(const aMsg: string) ;
begin
TThread.Synchronize(nil,
procedure
begin
ShowMessage(aMsg);
end);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
server := TIdWebsocketServer.Create(Self);
server.DefaultPort := 12345;
server.SocketIO.OnEvent(C_CLIENT_EVENT,
procedure(const ASocket: ISocketIOContext; const aArgument: TSuperArray; const aCallback: ISocketIOCallback)
begin
//show request (threadsafe)
ShowMessageInMainthread('REQUEST: ' + aArgument[0].AsJSon);
//send callback (only if specified!)
if aCallback <> nil then
aCallback.SendResponse( SO(['succes', True]).AsJSon );
end);
server.Active := True;
client := TIdHTTPWebsocketClient.Create(Self);
client.Port := 12345;
client.Host := 'localhost';
client.SocketIOCompatible := True;
client.SocketIO.OnEvent(C_SERVER_EVENT,
procedure(const ASocket: ISocketIOContext; const aArgument: TSuperArray; const aCallback: ISocketIOCallback)
begin
ShowMessageInMainthread('Data PUSHED from server: ' + aArgument[0].AsJSon);
//server wants a response?
if aCallback <> nil then
aCallback.SendResponse('thank for the push!');
end);
client.Connect;
client.SocketIO.Emit(C_CLIENT_EVENT, SO([ 'request', 'some data']),
//provide callback
procedure(const ASocket: ISocketIOContext; const aJSON: ISuperObject; const aCallback: ISocketIOCallback)
begin
//show response (threadsafe)
ShowMessageInMainthread('RESPONSE: ' + aJSON.AsJSon);
end);
//start timer so server pushes (!) data to all clients
Timer1.Interval := 5 * 1000; //5s
Timer1.Enabled := True;
end;
procedure TForm1.Timer1Timer(Sender: TObject);
begin
Timer1.Enabled := false;
server.SocketIO.EmitEventToAll(C_SERVER_EVENT, SO(['data', 'pushed from server']),
procedure(const ASocket: ISocketIOContext; const aJSON: ISuperObject; const aCallback: ISocketIOCallback)
begin
//show response (threadsafe)
TThread.Synchronize(nil,
procedure
begin
ShowMessage('RESPONSE from a client: ' + aJSON.AsJSon);
end);
end);
end;