ahc@sisd.kodak.com (Aleck Che-Mponda CUST) (08/07/90)
I am trying to patch the laserwriter driver (yes, I know it must be liscenced, but I need a product first). I specifically need to patch the PrJobDialog call so that our device specific dialog appears. According to Apple documentation, the call lies in the code resource PDEF 4 with a jump table offset = 8. Apple says, "Patching PDEFs is completely UNSUPPORTED." I'm using LSC 4.0 (BTW, great product, but implementation of "malloc" has caused many-a-sleepless nigths). I have TMON, Nosy. I'm able to merge my code segment into the laserwriter driver but I haven't been able to coax the execution of my PDEF code segment(which I've numbered #312). Has anybody tried to patch code resources? Could you send me code,theory,etc., I believe it must be done in assembly. I have tried placing an address call at the appropriate location (using ResEdit) but I'm unable to make my code segment be referenced by the laserwriter's PDEF 4 jump table. [I have copied my DITL's and DLOG's to the LW]. Nosy gives me the following for the PDEF #4's jump table: 0: 4eFA 09C4 10009C6 PDEF JMP proc32 4: 4EFA 0290 1000296 JMP proc17 8: 4EFA 02A8 10002B2 JMP proc18 <=== ^^^^ What coding is required for my code segment to be called? All help would be appreciated. Please E-mail replies to me. I will summarize to net. Che! Disclaimer: My employers can not be held responsible for my ignorance and stupidity. -- ***************************************************************** Aleck Che-Mponda ahc@sisd.kodak.com Software Engineer amc4023@ma.rit.edu "A geek, 'and proud of it, man!' "