#Modula-2
3 messages in this thread
Can't help with the CLI questions (never looked at it). BPTRs are
pretty simple, they are the pointers used by BCPL. BCPL can only address
the memory as long words so it`s pointers are perverse (that is a comment
on BCPL). Basicly multiply the BPTR by 4 and you have a "real" pointer
that C or Modula-2 can use. (Remember that anything a BPTR points at must
be long word aligned.)
Dan, Thanks for the reply; I now understand how to convert from a BPTR
to a "real" pointer and what the difference is. However, what is a BCPL? Also
is a filelock, or filehandle a pointer to a file? And how does a filelock for a
RAW: (opened with DOSfiles.Open) relate to a BPTR or a "real" pointer?
Thanks,
Jim Vogel
BCPL is yet another language. (It is one of the ancestors of C.)
I've never used it so I can't tell you anything else about it.
A file lock is a pointer to a data structure that AmigaDOS uses to
locate the file. But from the program side it normally doesn't matter what
it is (other than it being a 32 bit number) since there normally isn't any
reason for a program to reference anything off that pointer. It is just
passed to AmigaDOS as a parameter in various i/o calls. If you really want
to know what is in the file lock structure you should look it up in the
header files that come with one of the C's or in the RKM (I think it is in
the RKM, not positive though). When you start looking at the various
AmigaDOS data structures you will find that they contain a mixture of
normal pointers and BPTRs, and it is a big job keeping track of which is
which.