At 04:11 PM 6/9/99 +0800, you wrote:
>Suppose,
>// dbRef is the database with 100 records, each of size 15k
>for (i=0;i<100;i++)
> {
> recordH=DmQueryRecord(dbRef,i);
> recordPtr=MemHandleLock(recordH);
> myPtr[i]=(CharPtr)recordPtr;
> MemHandleUnlock(recordH);
> }
>
>Is it very unsafe to access myPtr after this FOR loop? Is the answer of
>this question depends on whether I would have to create new record or
>increasing the size of record after this FOR loop? OR, is the answer of
>the question depends on whether I have plenty of free storage heap
>memory or not?
>
It is unsafe to access myPtr [i] after you have called MemHandleUnlock ( ).
Once you unlock a memory handle, the memory the pointer is no longer
guaranteed to point to that memory.
>I think I would just leave MemHandleUnlock to happen when I exit my
>application. Am I correct?
>
You want to lock memory only so long as you absolutely have to. When you
are done with the pointer, unlock it and let the OS do its job.
Hope this helps!
Greg
Greg Winton
Bachmann Software and Services, LLC
mailto:[EMAIL PROTECTED]
http://www.bachmannsoftware.com
Software Development for Handheld & Mobile Computing, Windows and the Internet
Home of Bachmann Print Manager, the only graphical printing solution for
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