ASP.NET SignalR Client
Connect to ASP.NET SignalR (classic) hubs from Delphi/C++Builder. Negotiate, invoke server methods and receive client-side callbacks over a single typed component.
Connect to ASP.NET SignalR (classic) hubs from Delphi/C++Builder. Negotiate, invoke server methods and receive client-side callbacks over a single typed component.
Client for the classic ASP.NET SignalR protocol. Handles the negotiate REST step, the WebSocket connect URL, hub-method invocation and the JSON envelope.
TsgcWSAPI_SignalR
Windows, macOS, Linux, iOS, Android
Standard / Professional / Enterprise
Pair with TsgcWebSocketClient targeting the SignalR endpoint, declare a hub, then call Invoke (server method) and bind to OnSignalRMessage (callbacks).
uses
sgcWebSocket, sgcWebSocket_API_SignalR;
var
WSClient: TsgcWebSocketClient;
SignalR: TsgcWSAPI_SignalR;
begin
WSClient := TsgcWebSocketClient.Create(nil);
WSClient.Host := 'signalr.example.com';
SignalR := TsgcWSAPI_SignalR.Create(nil);
SignalR.Client := WSClient;
SignalR.SignalR.Hub := 'chathub';
WSClient.Active := True;
// Invoke a server-side method on the hub
SignalR.Invoke('SendMessage', ['user1', 'hello']);
end;// uses: sgcWebSocket, sgcWebSocket_API_SignalR
TsgcWebSocketClient *WSClient = new TsgcWebSocketClient(this);
TsgcWSAPI_SignalR *SignalR = new TsgcWSAPI_SignalR(this);
SignalR->Client = WSClient;
SignalR->SignalR->Hub = "chathub";
WSClient->Active = true;Implements the legacy ASP.NET SignalR protocol (the pre-Core variant).
The classic SignalR protocol negotiates over HTTP first (connection token, protocol version, transport set). The component performs the negotiate call before opening the WebSocket.
Invoke(method, args) sends the hub-style envelope with H (hub), M (method), A (args) fields and a sequence ID; replies arrive as OnSignalRMessage.
Server-initiated push messages surface as OnSignalRClientCallback(method, args) — the component parses the M / A envelope and delivers raw JSON arguments.
On disconnect the component re-negotiates and resumes the connection ID. WatchDog on the underlying client handles transport-level retries.
Authentication cookies are propagated from the negotiate call into the WebSocket handshake automatically. Configure custom headers via the underlying client.
Classic SignalR is still maintained for ASP.NET 4.x apps. For .NET Core / .NET 5+ hubs use the sibling TsgcWSAPI_SignalRCore component instead.
Authoritative sources for the protocol this component implements.
Deep-link to the component reference, grab the ready-to-run demo project, and download the trial.
| Online Help — API_SignalR Full property, method and event reference for this component. | Open | |
| Free Trial — sgcWebSockets Download the trial package to connect to ASP.NET SignalR hubs from Delphi. | Open | |
| Technical Document (PDF) Features, quick start, code samples for Delphi & C++ Builder and primary-source references — this component only. | Open | |
| User Manual (PDF) Comprehensive manual covering every component in the library. | Open |