(C# UWP/WinRT) Read Bitfinex WebSocket Ticker Channel

Subscribes to the public Bitfinex websocket ticker channel and receives ticker updates.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

//  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 api.bitfinex.com
bool success = await rest.ConnectAsync("api.bitfinex.com",443,true,false);
ws.UseConnection(rest);
ws.AddClientHeaders();

string responseBody = await rest.FullRequestNoBodyAsync("GET","/ws");
success = ws.ValidateServerHandshake();
if (success != true) {
    Debug.WriteLine(ws.LastErrorText);
    Debug.WriteLine(responseBody);
    Debug.WriteLine(rest.ResponseHeader);
    return;
}

//  After connecting, the bitfinex websocket server will send
//  an info message that contains the actual version of the websocket stream.
//  Receive that message..
success = await ws.ReadFrameAsync();
if (success != true) {
    Debug.WriteLine("Failed to receive a frame");
    Debug.WriteLine("ReadFrame fail reason = " + Convert.ToString(ws.ReadFrameFailReason));
    Debug.WriteLine(ws.LastErrorText);
    return;
}

//  We should get this:
//  {"event":"info","version":1.1,"platform":{"status":1}}
Debug.WriteLine(ws.GetFrameData());

//  Subscribe to the public ticker feed.
//  See https://docs.bitfinex.com/docs for more information.
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.AppendString("event","subscribe");
json.AppendString("channel","ticker");
json.AppendString("pair","BTCUSD");

bool finalFrame = true;
success = await ws.SendFrameAsync(json.Emit(),finalFrame);

//  Read the response.
success = await ws.ReadFrameAsync();
if (success != true) {
    Debug.WriteLine("Failed to receive a frame");
    Debug.WriteLine("ReadFrame fail reason = " + Convert.ToString(ws.ReadFrameFailReason));
    Debug.WriteLine(ws.LastErrorText);
    return;
}

//  Examine the response
//  We should get this:
//  {"event":"subscribed","channel":"ticker","chanId":2751,"pair":"BTCUSD"}
Debug.WriteLine(ws.GetFrameData());

//  Begin reading the ticker feed.
//  We'll just read the 1st 5 updates and then exit..
bool receivedFinalFrame = false;
int numUpdatesReceived = 0;
while (numUpdatesReceived < 5) {

    success = await ws.ReadFrameAsync();
    if (success != true) {
        Debug.WriteLine("Failed to receive a frame");
        Debug.WriteLine("ReadFrame fail reason = " + Convert.ToString(ws.ReadFrameFailReason));
        Debug.WriteLine(ws.LastErrorText);
        return;
    }

    //  The responses we desire are in Text frames, where the opcode = 1.
    if (ws.FrameOpcodeInt == 1) {
        string receivedText = ws.GetFrameData();
        Debug.WriteLine(receivedText);
        //  Should receive a line of text such as this:
        //  [2751,7349,36.34269559,7349.1,41.01777063,-116.2,-0.0156,7349.1,22188.26055319,7560,7270.5]
        numUpdatesReceived = numUpdatesReceived + 1;
    }

}

//  Close the websocket connection.
success = await ws.SendCloseAsync(true,1000,"Closing this websocket.");
if (success != true) {
    Debug.WriteLine(ws.LastErrorText);
    return;
}

//  Read the Close response.
success = await ws.ReadFrameAsync();
if (success != true) {
    Debug.WriteLine("ReadFrame fail reason = " + Convert.ToString(ws.ReadFrameFailReason));
    Debug.WriteLine(ws.LastErrorText);
    return;
}

Debug.WriteLine("Success.");