SQL Server

TCP Socket Send Byte and Receive Byte

Demonstrates the Chilkat Socket ReceiveByte and SendByte method. SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

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

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

    -- --------------------------------------------------------------------
    -- This example uses the public TCP echo service at https://tcpbin.com/
    -- --------------------------------------------------------------------

    DECLARE @useTls int
    SELECT @useTls = 0
    DECLARE @port int
    SELECT @port = 4242
    DECLARE @maxWaitMs int
    SELECT @maxWaitMs = 5000
    EXEC sp_OAMethod @sock, 'Connect', @success OUT, 'tcpbin.com', @port, @useTls, @maxWaitMs
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @sock, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sock
        RETURN
      END

    -- Wait a max of 2 seconds for a response..
    EXEC sp_OASetProperty @sock, 'MaxReadIdleMs', 2000

    -- Send a byte.
    EXEC sp_OAMethod @sock, 'SendByte', @success OUT, 96

    -- The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
    EXEC sp_OAMethod @sock, 'SendByte', @success OUT, 10

    -- The echo server will echo back whatever is sent to it.
    -- We should be able to read the same byte back..
    -- After successfully reading, the byte value is available in the ReceivedInt property.
    DECLARE @treatAsUnsignedInt int
    SELECT @treatAsUnsignedInt = 1
    EXEC sp_OAMethod @sock, 'ReceiveByte', @success OUT, @treatAsUnsignedInt
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @sock, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sock
        RETURN
      END

    -- Let's look at the value of the byte received.  It should be 96.
    EXEC sp_OAGetProperty @sock, 'ReceivedInt', @iTmp0 OUT
    PRINT @iTmp0

    -- The echo server also echoed the LF back.
    EXEC sp_OAMethod @sock, 'ReceiveByte', @success OUT, @treatAsUnsignedInt
    -- Assuming success..

    -- Should be decimal 10.
    EXEC sp_OAGetProperty @sock, 'ReceivedInt', @iTmp0 OUT
    PRINT @iTmp0

    EXEC @hr = sp_OADestroy @sock


END
GO