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%ew - Exit Windows Callback

Purpose

To specify a call-back function to be called if the user shuts down the Windows session (exit Windows) whilst the program is running.

Syntax

winio@('%ew',cb_func)
external cb_func

Description

The call-back function could be used to ask the user if results are to be saved before the session ends, etc.. If the call-back function returns zero, the shut-down is allowed to proceed. Any other value will abort the shut-down and leave the application running.

Note that if your program allows shut-down to proceed, other applications that are still running may still elect to abort the shut-down.

See also

%cc - Control Closure

 

 

 

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