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fixed bug #1403608 - Callback function called when host function already returned

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explain in documentation that the callback destination variable must be cleared


git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@4474 212acab6-be3b-0410-9dea-997c60f758d6
This commit is contained in:
kichik 2006-01-13 15:24:46 +00:00
parent 779b1ce1c1
commit d7dc9025cd
1 changed files with 2 additions and 1 deletions
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3
Contrib/System/System.html
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@ -371,7 +371,7 @@ StrCmp $R0 "callback1" 0 +2
DetailPrint "UseCallback passed ($0, $1) to the callback"
</pre></blockquote>
<p>After you've processed the callback call, you should use <a href="#callfuncs">Call</a>, passing it the value returned by <a href="#callfuncs">Get</a> - the callback. This tells System to return from the callback. If you've specified a source for the return "parameter" when the callback was created, you should fill that source with the appropriate return value. Callbacks are not automatically freed, don't forget to free it after you've finished using it.</p>
<p>After you've processed the callback call, you should use <a href="#callfuncs">Call</a>, passing it the value returned by <a href="#callfuncs">Get</a> - the callback. This tells System to return from the callback. Destination of the return "parameter" must be cleared prior to calling a function, to avoid false detection of a callback call. If you've specified a source for the return "parameter" when the callback was created, you should fill that source with the appropriate return value. Callbacks are not automatically freed, don't forget to free it after you've finished using it.</p>
<blockquote><pre>SetPluginUnload alwaysoff
System::Get "(i .r0, i .r1) isR0"
@ -381,6 +381,7 @@ loop:
StrCmp $R0 "callback1" 0 done
DetailPrint "UseCallback passed ($0, $1) to the callback"
Push 1 # return value of the callback
StrCpy $R0 "" # clear $R0 in case there are no more callback calls
System::Call $0 # tell system to return from the callback
Goto loop
done: