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(C#) Send and Receive WebSocket MessagesThis example how to send and receive websocket messages. A WebSocket message can be composed of one or more frames. The simple case is where a single frame is both the first and last frame in a message. This is the case where the 1st frame in the message has the "final frame" bit set. This example demonstrates sending and receiving multi-frame messages.
Note: The websockets.chilkat.io server imposes the following limitations:
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.WebSocket ws = new Chilkat.WebSocket(); // For brevity, this example does not check for errors when etablishing the WebSocket connection. // See Establish WebSocket Connection for more complete sample code for making the connection. Chilkat.Rest rest = new Chilkat.Rest(); // Connect to websockets.chilkat.io // IMPORTANT: websockets.chilkat.io accepts frames of up to 16K in size and echoes them back. // IMPORTANT: The websockets.chilkat.io server imposes the following limitations: // ---------- Messages must be 16K or less, and each connection is limited to a max of 16 echoed messages. bool success = rest.Connect("websockets.chilkat.io",80,false,false); ws.UseConnection(rest); ws.AddClientHeaders(); string responseBodyIgnored = rest.FullRequestNoBody("GET","/wsChilkatEcho.ashx"); success = ws.ValidateServerHandshake(); if (success != true) { Debug.WriteLine(ws.LastErrorText); return; } // This example demonstrates sending and receiving a multi-frame message. // The websocket message will be composed of three text lines, each frame will contain a single line. // Send the 1st frame in the message. bool finalFrame = false; success = ws.SendFrame("This is the 1st frame\r\n",finalFrame); if (success != true) { Debug.WriteLine(ws.LastErrorText); return; } // Send the 2nd frame in the message. success = ws.SendFrame("This is the 2nd frame\r\n",finalFrame); if (success != true) { Debug.WriteLine(ws.LastErrorText); return; } // Send the 3rd and final frame in the message. finalFrame = true; success = ws.SendFrame("This is the 3rd frame\r\n",finalFrame); if (success != true) { Debug.WriteLine(ws.LastErrorText); return; } // Read an incoming frames until we receive the final frame. // Note: It may be that the echo server (websockets.chilkat.io) responds with // the full message in a single final frame. bool receivedFinalFrame = false; while (receivedFinalFrame == false) { success = ws.ReadFrame(); if (success != true) { Debug.WriteLine("Failed to receive a frame"); Debug.WriteLine("ReadFrame fail reason = " + Convert.ToString(ws.ReadFrameFailReason)); Debug.WriteLine(ws.LastErrorText); return; } receivedFinalFrame = ws.FinalFrame; // Show the opcode and final frame bit for the frame just received: Debug.WriteLine("Frame opcode: " + ws.FrameOpcode); Debug.WriteLine("Final frame: " + Convert.ToString(receivedFinalFrame)); } // Return the message accumulated in the above calls to ReadFrame. string receivedMsg = ws.GetFrameData(); Debug.WriteLine("Received: " + receivedMsg); // Close the websocket connection. success = ws.SendClose(true,1000,"Closing this websocket."); if (success != true) { Debug.WriteLine(ws.LastErrorText); return; } // Read the Close response. success = ws.ReadFrame(); if (success != true) { Debug.WriteLine("ReadFrame fail reason = " + Convert.ToString(ws.ReadFrameFailReason)); Debug.WriteLine(ws.LastErrorText); return; } // Should receive the "Close" opcode. Debug.WriteLine("Received opcode: " + ws.FrameOpcode); // Should be the same status code we sent (1000) Debug.WriteLine("Received close status code: " + Convert.ToString(ws.CloseStatusCode)); // The server may echo the close reason. If not, this will be empty. Debug.WriteLine("Echoed close reason: " + ws.CloseReason); Debug.WriteLine("Success."); |
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