Difference between revisions of "680x0:Opening a library"
Spellcoder (talk | contribs) (Example on how to open a library (ripped from my old tutorial)) |
Spellcoder (talk | contribs) (changed so example gets syntax highlighting) |
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| − | <code | + | <code lang="m68k"> |
OldOpenLibrary = -408 ; OldOpenLibrary(libName)(A1) | OldOpenLibrary = -408 ; OldOpenLibrary(libName)(A1) | ||
OpenLibrary = -552 ; OpenLibrary(libName,version)(A1,D0) | OpenLibrary = -552 ; OpenLibrary(libName,version)(A1,D0) | ||
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libname: dc.b 'dos.library',0 | libname: dc.b 'dos.library',0 | ||
libbase: dc.l $00000000 | libbase: dc.l $00000000 | ||
| − | + | </code> | |
Revision as of 23:01, 24 March 2008
This is a example on how to open a library:
(with the Library Vector Offsets added so you won't need to use any includes yet)
OldOpenLibrary = -408 ; OldOpenLibrary(libName)(A1)
OpenLibrary = -552 ; OpenLibrary(libName,version)(A1,D0)
CloseLibrary = -414 ; CloseLibrary(library)(A1)
move.l $4.w,a6 ; Get the value at position $4 in memory ; This value is the base of exec.library
lea LibName(pc),a1 ; libName must be in A1 moveq #0,d0 ; version must be in D0 jsr OpenLibrary(a6) ; Call the OpenLibrary function
; OldOpenLibrary looks if the library is in memory (or ROM) ; and loads it if nessesary. ; Then it returns the base of graphics.library in d0
move.l d0,libbase ; Store the base
; Closelibrary needs the base of the library ; (the address given to you in D0 by OpenLibrary) ; to close the library
move.l libbase,a1 ; Get the base jsr CloseLibrary(a6)
rts
libname: dc.b 'dos.library',0 libbase: dc.l $00000000
