I am using MemHeapFreeBytes() to figure out how much free space is left on
the heap (duh). However, the results I get don't seem correct. For
example, on an OS 4.0 debug ROM, MemHeapFreeBytes() tells me the max chunk
size is more than 200K! Obviously I cannot allocate something that large.
An OS 3.5 debug ROM gives me about 100K, and an OS 3.0 debug rom tells me
the max chunk size is 65,428. I guess that might be correct since it's
(BARELY!) under the 64K limit but I'm skeptical nonetheless.
Here is how I'm using MemHeapFreeBytes()...
---------------------------------------------
UInt16 i = 0;
UInt32 maxChunkSize = 0;
UInt32 heapFreeSpace = 0;
UInt32 thisChunkSize = 0;
UInt16 heapID = 0;
UInt16 cardNo = 0;
for (i=0; i<MemNumRAMHeaps(cardNo); i++) {
heapID = MemHeapID (cardNo, i);
if (MemHeapDynamic(heapID)) {
MemHeapFreeBytes (heapID, &heapFreeSpace, &thisChunkSize);
if (thisChunkSize > maxChunkSize)
maxChunkSize = thisChunkSize;
}
}
return maxChunkSize;
----------------------------------------------
I've also tried this under various SDK's without any change.
Am I missing something? Anybody else seen this behavior? Thanks for any
and all suggestions.
Nick Guarracino
DataViz, Inc.
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