Using the Yield() Subroutine (Functions/Subroutines/Programs) [Revelation On-Line Wiki]

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====== Using the Yield() Subroutine (Functions/Subroutines/Programs) ======

======   ======

==== Created at 15 SEP 1997 03:44PM ====




Yield() is designed to allow users to cancel out of loops that may take a long time to generate.  For example:  Looping through a table that has a large number of records can take quite a long period of time to generate.  Yield() will allow you to cancel the process and proceed with the rest of the program.

 

Yield() is not a function that you pass parameters to.  It actually checks the queue for events that need to be processed.

 

Example:

%%**%%This routine starts a form that was made in form designer that has only a cancel button on it.  The button s only function is to close the form.  Next the routine is going through a loop 500 times and checking to see if the form still exists.**

 

%%**%%Start the cancel window%%**%%

dlg = Start_Window( CANCELWIN ,   ,   ,   ,   )

for x = 1 to 500

YIELD()

            %%**%%Checking to see if the window was closed%%**%%

IF Get_Property(dlg, 'HANDLE') THEN

            x = x + 1

END

next x

 

            This example is in a very simple form and can be used in much more complex and larger programs.