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stop

Cancel subscription WDS data request

Syntax

stop(c,requestid)

Description

example

stop(c,requestid) cancels the Wind Data Feed Services (WDS) subscription data request specified by the request identifier using the WDS connection.

Examples

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Using a WDS connection, subscribe to two securities and process real-time events by using an event handler function. Then cancel the subscription.

Create a WDS connection.

c = wind;

Format output data for currency.

format bank

Using the 0002.HK and 0003.HK securities and the WDS connection, retrieve real-time data for the last price, volume, and last volume fields. Process real-time data events using the sample event handler function windEventHandler. You can use the sample event handler function or create a custom event handler function to process events.

s = {'0002.HK','0003.HK'};
f = {'rt_last','rt_vol','rt_last_vol'}};

requestid = realtime(c,s,f,@(varargin)windEventHandler(varargin))
requestid =

  uint64

   5

requestid is the request identifier associated with the subscription. The event handler function windEventHandler creates a variable in the MATLAB® workspace named winddata. This variable contains the subscription data.

Display the subscription data.

winddata
winddata =

  2×4 timetable

            Time              Codes      RT_LAST      RT_VOL       RT_LAST_VOL
    ____________________    _________    _______    ___________    ___________

    28-Nov-2017 10:55:25    '0002.HK'     81.30      2106274.00     422500.00 
    28-Nov-2017 10:55:25    '0003.HK'     15.28     19995745.00    1398000.00 

winddata is a timetable that contains a row for each security with the time and these variables:

  • Security

  • Last price

  • Volume

  • Last volume

Stop the data subscription using the request identifier.

stop(c,requestid)

Close the WDS connection.

close(c)

Input Arguments

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WDS connection, specified as a connection object created with the wind function.

Request identifier, specified as a numeric scalar created by the realtime function.

Example: 5

Data Types: uint64

Introduced in R2018a