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- Filling an Array from a column in a DB
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- ObjectType Error 1690 Ole Unable to Perform Enumeration of the Specified Object
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PtrPersistent and ArrInitialize Issue
Keywords: PtrPersistent ArrInitialize Pointer
Question:
Started playing around with "ptrPersistent". Wanted to keep some information in an array. Got a rather strange result. Here is the code, distilled down to a minimum.
#DefineFunction Test(Param1,Param2)
pInteger = PtrPersistent(pInteger,0)
pString = PtrPersistent(pString,"")
pArray = PtrPersistent(pArray,0)
if *pInteger == 0
*pArray = ArrDimension(8)
ArrInitialize(*pArray,0)
*pInteger = 1
end if
return ""
#EndFunction
Test("A","B")
I was getting strange errors when I ran this, so I stepped through the execution with WinBatch Studio. When the script executes ArrInitialize(*pArray,0),
studio shows the pString value has become an array. This is certainly not what I expected.
Minor changes in the script can change the behavior. For example, if the function has three parameters, instead of two, the "pInteger" value becomes an array. (Still not what I expected!)What's going on here?
Answer:
The problem resides in the 'ArrInitialize' function and can be reproduced in 2009B. It will be addressed in the next release.In the interim a workaround is to create and initialize the array in a temporary variable then assign the temporary variable to the pointer
#DefineFunction Test(Param1,Param2)
DebugTrace(@ON, DirScript():"Dump.txt")
pInteger = PtrPersistent(pInteger,0)
pString = PtrPersistent(pString,"")
pArray = PtrPersistent(Array,0)
If *pInteger == 0
aTemp = ArrDimension(8)
ArrInitialize(aTemp,0)
*pArray = aTemp
*pInteger = 1
EndIf
Return ""
#EndFunction
Test("A","B")
Thanx for reporting the problem.
DON'T PANIC
Article ID: W17664
Filename: PtrPersistent and ArrInitialize Issue.txt
File Created: 2009:05:04:14:47:24
Last Updated: 2009:05:04:14:47:24