Re: Problem with CTB callback crashing ?
Posted by: Greg_Neagle <Greg_Neagle@...>
:I seem to be having a little problem with a CommsToolBox
:call back.
:
:I have added a search to the incoming data using the
:CMAddSearch function. This seems to work OK and returns
:a valid Reference number.
:
:callBackProc& = @FN MySearchCallBack
:flags% = _Cmsearchsevenbit
:
:gActiveSearch& = FN CMAddSearch(gModemConn&,searchTxt$,flags%,callBackProc&)
:
:
:My problem occurs when CMRead calls the Search Call Back.
You cannot use an FB local fn as a callback proc. Instead you must use the
ENTERPROC/EXITPROC pair, with all its quirks and limitations (no local
varables; global only; quirky behavior when not in the first segment of your
app).
GOTO "After SearchCallBackProc"
"SearchCallBackProc"
ENTERPROC(gHConn&, gMatchPtr&, gRefNum&)
FN MySearchCallBack(gHConn&, gMatchPtr&, gRefNum&) 'call the FB function
EXITPROC
"After SearchCallBackProc"
callBackProc& = LINE "SearchCallBackProc"
flags% = _Cmsearchsevenbit
gActiveSearch& = FN CMAddSearch(gModemConn&,searchTxt$,flags%,callBackProc&)
FB^3 should help in this matter by allowing you to define functions that use
PASCAL-style calling conventions.
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