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Q58647: How to Successfully Debug VioPopUp() Code with CodeView

Article: Q58647
Product(s): See article
Version(s): 2.20 2.30 2.35
Operating System(s): OS/2
Keyword(s): ENDUSER | | mspl13_basic
Last Modified: 27-FEB-1990

Debugging programs that take advantage of OS/2's VioPopUp() call can
present a potentially dangerous situation. Due to the nature of the
VioPopUp() call, any attempts to trace into the VioPopUp call will cause
your machine to hang. The workaround for this difficulty is to set a
breakpoint outside of the VioPopUp() call [after the VioEndPopUp()], and
then press F5 to instruct CodeView to execute to the next breakpoint.

The VioPopUp() call brings forward a temporary pop-up text screen group
that can be used to display text information without altering the
context of the foreground screen. When a VioPopUp() call is executed, the
current foreground screen group loses the keyboard focus to the pop-up
screen. Therefore, when you trace into a VioPopUp() call, the pop-up
text comes forward and CodeView, running in the foreground, loses the
keyboard focus and cannot execute a trace instruction. At this time,
CTRL+ESC or ALT+ESC will not change the deadlock situation and the
only alternative is to reboot.

To work around this problem, it is essential that you do NOT step into
a VioPopUp call. Instead, press F5 to execute to the next breakpoint.
Setting the breakpoint AFTER the VioEndPopUp() call is critical.

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