B4X
Binary.com Tick Stream

Tick Stream Request -- Initiate a continuous stream of spot price updates for a given symbol.
Chilkat B4X Downloads

B4X
Dim success As Boolean = False

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

Dim ws As ChilkatWebSocket
ws.Initialize("ws")

'  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 ChilkatRest
rest.Initialize("rest")

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

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


'  Build and send the following message:

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

Dim json As ChilkatJsonObject
json.Initialize
json.AppendString("ticks", "R_50")
json.AppendInt("subscribe", 1)

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


Dim jsonTickData As ChilkatJsonObject
jsonTickData.Initialize
jsonTickData.EmitCompact = False

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

    success = ws.ReadFrame
    If success <> True Then
        Log("Failed to receive a frame")
        Log("ReadFrame fail reason = " & ws.ReadFrameFailReason)
        Log(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 = ws.GetFrameData

        jsonTickData.Load(receivedJson)
        Log(jsonTickData.Emit)

        numTicksReceived = numTicksReceived + 1
    End If


Loop

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


'  Read the Close response.
success = ws.ReadFrame
If success <> True Then
    Log("ReadFrame fail reason = " & ws.ReadFrameFailReason)
    Log(ws.LastErrorText)
    Return
End If


Log("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.