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Speccy ClassiX 1998
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RKRM_PartTwo
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Utility
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hooks1.e
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1995-09-20
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986b
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40 lines
-> hooks1.e
->>> Header (globals)
MODULE 'utility',
'utility/hooks',
'tools/installhook'
ENUM ERR_NONE, ERR_LIB
RAISE ERR_LIB IF OpenLibrary()=NIL
->>>
->>> PROC myFunction(h:PTR TO hook, o, msg)
-> This function only prints out a message indicating that we are inside the
-> callback function.
PROC myFunction(h:PTR TO hook, o, msg)
-> E-Note: installhook has set-up access to data segment
WriteF('Inside myFunction()\n')
ENDPROC 1
->>>
->>> PROC main()
PROC main() HANDLE
DEF h:hook
-> Open the utility library
utilitybase:=OpenLibrary('utility.library', 36)
-> Initialise the callback hook
-> E-Note: use installhook to do the main stuff (so h.data cannot be used)
installhook(h, {myFunction})
-> Use the utility library function to invoke the hook
CallHookPkt(h, NIL, NIL)
EXCEPT DO
IF utilitybase THEN CloseLibrary(utilitybase)
SELECT exception
CASE ERR_LIB; WriteF('Error: could not open utility library\n')
ENDSELECT
ENDPROC
->>>