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SQL Server Examples


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(SQL Server) Send and Receive WebSocket Frame

Demonstrates how to send a websocket text frame to a websocket echo server. This example uses Chilkat's websocket test echo server at ws://websockets.chilkat.io/wsChilkatEcho.ashx

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    DECLARE @sTmp0 nvarchar(4000)
    --  This example requires the Chilkat API to have been previously unlocked.
    --  See Global Unlock Sample for sample code.

    DECLARE @ws int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.WebSocket', @ws OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    --  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.

    DECLARE @rest int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Rest', @rest OUT

    --  Connect to websockets.chilkat.io
    --  (websockets.chilkat.io accepts frames of up to 16K in size and echoes them back)
    DECLARE @success int
    EXEC sp_OAMethod @rest, 'Connect', @success OUT, 'websockets.chilkat.io', 80, 0, 0
    EXEC sp_OAMethod @ws, 'UseConnection', @success OUT, @rest
    EXEC sp_OAMethod @ws, 'AddClientHeaders', @success OUT
    DECLARE @responseBodyIgnored nvarchar(4000)
    EXEC sp_OAMethod @rest, 'FullRequestNoBody', @responseBodyIgnored OUT, 'GET', '/wsChilkatEcho.ashx'
    EXEC sp_OAMethod @ws, 'ValidateServerHandshake', @success OUT
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ws, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ws
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

    --  This example demonstrates sending a frame and receiving a text frame.

    --  Send a frame containing the string "Hello World!"
    --  This will be the first and final frame, and therefore this constitutes the entire message.
    DECLARE @finalFrame int
    SELECT @finalFrame = 1
    EXEC sp_OAMethod @ws, 'SendFrame', @success OUT, 'Hello World!', @finalFrame
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ws, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ws
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

    --  Read an incoming frame.
    EXEC sp_OAMethod @ws, 'ReadFrame', @success OUT
    IF @success <> 1
      BEGIN

        PRINT 'Failed to receive a frame'

        EXEC sp_OAGetProperty @ws, 'ReadFrameFailReason', @iTmp0 OUT
        PRINT 'ReadFrame fail reason = ' + @iTmp0
        EXEC sp_OAGetProperty @ws, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ws
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

    --  Show the string that was received.
    DECLARE @receivedStr nvarchar(4000)
    EXEC sp_OAMethod @ws, 'GetFrameData', @receivedStr OUT

    PRINT 'Received: ' + @receivedStr

    --  Close the websocket connection.
    EXEC sp_OAMethod @ws, 'SendClose', @success OUT, 1, 1000, 'Closing this websocket.'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ws, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ws
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

    --  Read the Close response.
    EXEC sp_OAMethod @ws, 'ReadFrame', @success OUT
    IF @success <> 1
      BEGIN

        EXEC sp_OAGetProperty @ws, 'ReadFrameFailReason', @iTmp0 OUT
        PRINT 'ReadFrame fail reason = ' + @iTmp0
        EXEC sp_OAGetProperty @ws, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ws
        EXEC @hr = sp_OADestroy @rest
        RETURN
      END

    --  Should receive the "Close" opcode.

    EXEC sp_OAGetProperty @ws, 'FrameOpcode', @sTmp0 OUT
    PRINT 'Received opcode: ' + @sTmp0
    --  Should be the same status code we sent (1000)

    EXEC sp_OAGetProperty @ws, 'CloseStatusCode', @iTmp0 OUT
    PRINT 'Received close status code: ' + @iTmp0
    --  The server may echo the close reason.  If not, this will be empty.

    EXEC sp_OAGetProperty @ws, 'CloseReason', @sTmp0 OUT
    PRINT 'Echoed close reason: ' + @sTmp0


    PRINT 'Success.'

    EXEC @hr = sp_OADestroy @ws
    EXEC @hr = sp_OADestroy @rest


END
GO

 

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