Xojo Plugin

Binary.com Tick Stream

See more WebSocket Examples

Tick Stream Request -- Initiate a continuous stream of spot price updates for a given symbol. Xojo Plugin

Dim success As Boolean
success = False

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Dim ws As 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.

Dim rest As New Chilkat.Rest

// Connect to ws.binaryws.com
success = rest.Connect("ws.binaryws.com",443,True,False)
success = ws.UseConnection(rest)
success = ws.AddClientHeaders()

// My app_id is 12332.  You'll wnat to use your own...
Dim responseBody As String
responseBody = rest.FullRequestNoBody("GET","/websockets/v3?app_id=12332")
success = ws.ValidateServerHandshake()
If (success <> True) Then
    System.DebugLog(ws.LastErrorText)
    System.DebugLog(responseBody)
    System.DebugLog(rest.ResponseHeader)
    Return
End If

// Build and send the following message:

// {
//   "ticks": "R_50",
//   "subscribe": 1
// }

Dim json As New Chilkat.JsonObject
success = json.AppendString("ticks","R_50")
success = json.AppendInt("subscribe",1)

// Send a full message in a single frame
Dim finalFrame As Boolean
finalFrame = True
success = ws.SendFrame(json.Emit(),finalFrame)
If (success <> True) Then
    System.DebugLog(ws.LastErrorText)
    Return
End If

Dim jsonTickData As New Chilkat.JsonObject
jsonTickData.EmitCompact = False

// Begin reading the tick stream response.
// We'll just read the 1st 10 updates and then exit..
Dim receivedFinalFrame As Boolean
receivedFinalFrame = False
Dim numTicksReceived As Int32
numTicksReceived = 0
While numTicksReceived < 5

    success = ws.ReadFrame()
    If (success <> True) Then
        System.DebugLog("Failed to receive a frame")
        System.DebugLog("ReadFrame fail reason = " + Str(ws.ReadFrameFailReason))
        System.DebugLog(ws.LastErrorText)
        Return
    End If

    // The responses we desire are in Text frames, where the opcode = 1.
    If (ws.FrameOpcodeInt = 1) Then
        Dim receivedJson As String
        receivedJson = ws.GetFrameData()

        success = jsonTickData.Load(receivedJson)
        System.DebugLog(jsonTickData.Emit())

        numTicksReceived = numTicksReceived + 1
    End If

Wend

// Close the websocket connection.
success = ws.SendClose(True,1000,"Closing this websocket.")
If (success <> True) Then
    System.DebugLog(ws.LastErrorText)
    Return
End If

// Read the Close response.
success = ws.ReadFrame()
If (success <> True) Then
    System.DebugLog("ReadFrame fail reason = " + Str(ws.ReadFrameFailReason))
    System.DebugLog(ws.LastErrorText)
    Return
End If

System.DebugLog("Success.")

// The output of the above code is shown here:

// {
//   "echo_req": {
//     "subscribe": 1,
//     "ticks": "R_50"
//   },
//   "msg_type": "tick",
//   "tick": {
//     "ask": "373.8725",
//     "bid": "373.8325",
//     "epoch": "1517437456",
//     "id": "2d3dedf1-45e2-66a5-d0d3-72bd7f0a6ea9",
//     "quote": "373.8525",
//     "symbol": "R_50"
//   }
// }
// 
// {
//   "echo_req": {
//     "subscribe": 1,
//     "ticks": "R_50"
//   },
//   "msg_type": "tick",
//   "tick": {
//     "ask": "373.7952",
//     "bid": "373.7552",
//     "epoch": "1517437458",
//     "id": "2d3dedf1-45e2-66a5-d0d3-72bd7f0a6ea9",
//     "quote": "373.7752",
//     "symbol": "R_50"
//   }
// }
// 
// {
//   "echo_req": {
//     "subscribe": 1,
//     "ticks": "R_50"
//   },
//   "msg_type": "tick",
//   "tick": {
//     "ask": "373.8638",
//     "bid": "373.8238",
//     "epoch": "1517437460",
//     "id": "2d3dedf1-45e2-66a5-d0d3-72bd7f0a6ea9",
//     "quote": "373.8438",
//     "symbol": "R_50"
//   }
// }
// 
// {
//   "echo_req": {
//     "subscribe": 1,
//     "ticks": "R_50"
//   },
//   "msg_type": "tick",
//   "tick": {
//     "ask": "373.7636",
//     "bid": "373.7236",
//     "epoch": "1517437462",
//     "id": "2d3dedf1-45e2-66a5-d0d3-72bd7f0a6ea9",
//     "quote": "373.7436",
//     "symbol": "R_50"
//   }
// }
// 
// {
//   "echo_req": {
//     "subscribe": 1,
//     "ticks": "R_50"
//   },
//   "msg_type": "tick",
//   "tick": {
//     "ask": "373.6870",
//     "bid": "373.6470",
//     "epoch": "1517437464",
//     "id": "2d3dedf1-45e2-66a5-d0d3-72bd7f0a6ea9",
//     "quote": "373.6670",
//     "symbol": "R_50"
//   }
// }
// 
// Success.