Re: Chunk under-locked (newbie ques)

[Ted Beisler]

You've pretty much got it.  If you follow your code path however, you are 
unlocking myRecord twice.  Each time you unlock a record it decrements the 
lock count.  Since you are doing it twice, you are decrementing the count 
to a number below zero, thus getting the "Chunk under-locked" error.  If 
DmGetRecord fails, it shouldn't have locked anything, so get rid of the 
second MemHandleUnlock.  You should be doing a DmReleaseRecord when you're 
done too.

At 09:50 05/08/2003 -0500, you wrote:
Hi all....

This is a bit of a fundamental question here but I think I only barely
grasp how this whole Locking and Unlocking chunks is all about, not
to mention I'm a newbie programmer. :\
I realize you need to set aside a block or "chunk" of memory before
assigning a variable any value but it's the how in some scenarios that
is messing me up... anyways... I hope this isn't too much of a C question
as it is a Palm Dev Forum question.....
My function calls to the database for a particular record. The problem is
I'm trying to unpack it to my struct (onOrder) but I'm getting a "Chunk
under-locked" error.
So, how do I lock the chunk while passing it through the function....?!?!
My function definition below...
 static Err GetOrderRecord(DmOpenRef *dmReftoSync, UInt16 recordNum,
OnOrder *onOrder)
{
     Err err = 0;
     MemHandle myRecord = DmGetRecord(dmReftoSync, recordNum);
     if(!myRecord)
          err = DmGetLastErr();
     else
     {
          UnpackOnOrder(onOrder, (PackedOnOrder *)
MemHandleLock(myRecord));
          MemHandleUnlock(myRecord);
     }
     MemHandleUnlock(myRecord);
     return err;
}
Nole Mailey
Data Conversion Specialist
ProfitMaster Canada
1.800.340.4492
www.pmcanada.com
[EMAIL PROTECTED]


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Ted Beisler
SPRUCE Computer Systems, Inc.
[EMAIL PROTECTED]


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