> AA> MemPtrNew and MemHandleNew.
> AA> check out part II of the PalmOS programming guide.. the manual provides
> AA> everything you need :)
>
> Ah... I don't think so... Example:
>
> *) What will happen if you pass 0 for the size (*
>
> is it "defined but undocumented" ? or is it "undefined" ?
> is it "OS version dependent" ? or not?
> if it'll not crush, what will it pass back? NULL? or some variable.
>
> malloc - type function always have this problem, but none of the
> document for PalmOS gives me the answer.
>
> # Same type of problem occurs for "Resize".
> # what if I passed NULL? what if I passed size 0? what if both?
here is an excerpt taken from the SDK docs (3.0)
---
part 1: Interface Management
Chapter: Developing Palm OS Applications
- Overview of Application Development
. Avoid allocating zero-length objects (page 38)
It's not valid to allocate a zero-byte buffer, or to resize a
buffer to zero bytes. Palm OS 2.0 and previous releases allowed
this practice, but future revisions of the OS may not permit
zero length objects.
---
it is clearly documented - you just have not found it yet. of course,
any *decent* programmer would check that the size of the buffer is
not zero? and perform any relevant error checking - as documented
as well:
---
part 1: Interface Management
Chapter: Developing Palm OS Applications
- Overview of Application Development
. Check Results Codes When Allocating Memory (page 38)
Because future devices may have larger or smaller amounts of
available memory, it is always a good idea to check results codes
carefully when allocating memory. It's also good practice to
use the storage heap (and possibly file streams) to work with
large objects.
---
lastly, the C compilers interpret "0" as NULL - so i guess that
should answer your question there.
your code for memory allocation should look as follows:
{
BytePtr p;
Word size;
size = ...;
if (size != 0) {
p = (BytePtr)MemPtrNew(size * sizeof(Byte));
ErrFatalDisplayIf((p == NULL), "Oops, no memory available");
}
else {
ErrFatalDisplayIf(true, "The buffer must be > 0 bytes in size");
}
}
> I've been looking for answer for these questions, but still have not
> found the answer.
the answers are there.. you just need to LOOK for them :) the only
problem that i see is that this "documentation" was really stored
in the wrong place in the SDK docs. it should be with the Memory
Management descriptions - not in the Interface Management chapters.
that is not something you can bitch about to us developers on this
list tho - maybe Palm will rewrite the SDK API's one day - for now,
download the .pdf files that allow searching.
cheers.
az.
--
Aaron Ardiri
Java Certified Programmer http://www.hig.se/~ardiri/
University-College i G�vle mailto:[EMAIL PROTECTED]
SE 801 76 G�vle SWEDEN
Tel: +46 26 64 87 38 Fax: +46 26 64 87 88
Mob: +46 70 656 1143 A/H: +46 26 10 16 11
