wolf@mel.cipl.uiowa.edu (10/14/90)
I thought I had read in IM I that there is a 128 byte header area to all resource forks which could be used by the application. How does one use that area (say for storing a name, date or the like)? I don't recall reading anything else in IM I which talked about it. Is it easy to reach via standard pascal or is reached by inline programming or what? Thanks! Michael
russotto@eng.umd.edu (Matthew T. Russotto) (10/16/90)
In article <1990Oct13.215743.1@mel.cipl.uiowa.edu> wolf@mel.cipl.uiowa.edu writes: >I thought I had read in IM I that there is a 128 byte header area to all >resource forks which could be used by the application. How does one use that >area (say for storing a name, date or the like)? > >I don't recall reading anything else in IM I which talked about it. Is it easy >to reach via standard pascal or is reached by inline programming or what? Apple says you can't use it. (in the tech notes-- Don't use the resource application bytes for data). You get to it with File Manager calls, usign OpenRF instead of Open. -- Matthew T. Russotto russotto@eng.umd.edu russotto@wam.umd.edu .sig under construction, like the rest of this campus.
freek@fwi.uva.nl (Freek Wiedijk) (10/16/90)
russotto@eng.umd.edu (Matthew T. Russotto) writes: >In article <1990Oct13.215743.1@mel.cipl.uiowa.edu> wolf@mel.cipl.uiowa.edu writes: >>I thought I had read in IM I that there is a 128 byte header area to all >>resource forks which could be used by the application. How does one use that >>area (say for storing a name, date or the like)? >> >>I don't recall reading anything else in IM I which talked about it. Is it easy >>to reach via standard pascal or is reached by inline programming or what? > >Apple says you can't use it. (in the tech notes-- Don't use the resource >application bytes for data). You get to it with File Manager calls, usign >OpenRF instead of Open. Story: I once wrote a checksummer for the Mac (compatible with UN*X "sum"), that (among other things) checksummed the resource fork of a document. I was very surprised that the resource fork CHANGED if I copied/downloaded a document. So, it turned out to be the case that my checksummer was virtually useless.. I could have modified my program to checksum all but the header of the resource fork. However, in that case I wouldn't have been able to compare its output with "sum Document.rsrc" under UN*X. Freek "the Pistol Major" Wiedijk E-mail: freek@fwi.uva.nl #P:+/ = #+/P?*+/ = i<<*+/P?*+/ = +/i<<**P?*+/ = +/(i<<*P?)*+/ = +/+/(i<<*P?)**