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more info about kernal functions that silently restore vectors

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git-svn-id: svn://svn.cc65.org/cc65/trunk@2864 b7a2c559-68d2-44c3-8de9-860c34a00d81
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izydorst 2004-01-02 23:16:01 +00:00
parent 77e667c14d
commit 83342c6ee9
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doc/geos.sgml
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@ -1648,6 +1648,13 @@ void remove_hook(void) {
<p>
In your <tt/main/ function you should call <tt/hook_into_system()/ but <em/after/ all calls to GEOS
kernal (like <tt/DoMenu/, <tt/DoIcons/, etc.) - right before passing control to the <tt/MainLoop()/.
Be warned that vectors are most likely to be changed by GEOS kernal also by other functions (like
<tt/GotoFirstMenu/, <tt/DoDlgBox/ and its derivatives etc.). It depends on what kernal functions
you use and which vectors you altered. Unfortunately there is no exact list for GEOS 2.0, a complete
list for GEOS 1.x can be found in A. Boyce's Programmers' Referenece Guide mentioned before. Most of
information contained there should be still valid for GEOS 2.0. When calling a function that restores
the vector you should add a <tt/hook_into_system()/ call right after it.
<p>
It is critical to restore old vector values before exiting the program. If you have more than one
place where you call <tt/exit()/ then it might be worth to register <tt/remove_hook/ function to
be called upon exiting with <tt/atexit(&amp;remove_hook);/ call. This way you will ensure that