Terminate the UI Toolkit environment
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WSupported on Windows
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USupported on Unix
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VSupported on OpenVMS
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NSupported in Synergy .NET
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xcall U_FINISH([D_NOCLR][, cancel])
Arguments
D_NOCLR
(optional) Don’t clear the screen. By default, the screen is cleared when Toolkit processing is terminated. (n)
cancel
(optional) Returned true if the close method subroutine cancels the shutdown. (n)
Discussion
U_FINISH shuts down the UI Toolkit environment. It purges all channels U_START or U_OPEN opened in output mode except the terminal (if it was opened by U_START). U_FINISH is called by your application. It is also called internally by Toolkit.
If you have used E_METHOD to register an ECLOSE_METHOD with the environment, U_FINISH calls that ECLOSE_METHOD to perform any additional processing before shutting down the application.
If you pass cancel, it is passed on to your ECLOSE_METHOD. If you want your ECLOSE_METHOD to cancel termination, have it set a_cancel to true, and it will get passed back to your application through cancel.
If you do not pass cancel, your ECLOSE_METHOD will not have the opportunity to cancel the shutdown.
U_FINISH’s default is to clear the screen when Toolkit processing is terminated. If you pass D_NOCLR, the screen will not be cleared.
On Windows, if the application has previously called U_START and interrupt is enabled, the user can also close the application through the System-menu box or with the interrupt key. In both cases, UI Toolkit will internally call U_FINISH.
See also
E_METHOD and ECLOSE_METHOD for more information about environment-level events (such as shutting down the application)
Examples
The following example terminates Toolkit processing without clearing the screen.
xcall u_finish(D_NOCLR)
