Microsoft KB Archive/197190

= BUG: Memory Leak Using UBound or LBound When Returning Array =

Article ID: 197190

Article Last Modified on 5/13/2003

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APPLIES TO


 * Microsoft Visual Basic 6.0 Learning Edition
 * Microsoft Visual Basic 6.0 Professional Edition
 * Microsoft Visual Basic 6.0 Enterprise Edition

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This article was previously published under Q197190



SYMPTOMS
When you use a function that returns an array as a parameter to the UBound or LBound functions, the memory allocated for the array is not released.



CAUSE
The array is copied to temporary return storage, but the temporary storage is not released until the application ends.



RESOLUTION
To avoid this problem, assign the return value to a local variable before using UBound or LBound. For example:

vntReturn = ArryFunc iAryLen = UBound(vntReturn)



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.



Steps to Reproduce Behavior
 Create a New Standard EXE project in Visual Basic. Form1 is created by default. Add a CommandButton (Command1) to Form1.  Add the following code to Form1:

Public Sub Command1_Click iAryLen = UBound(ArryFunc) End Sub

  Add a standard Module to the project and add the following code:

Public Function ArryFunc as Long Dim x(100000) as Long ArryFunc = x     End Function

 Run the project.</li></ol>

RESULT: When you click the button, it leaks ~400k with each click.

Keywords: kbbug kbpending KB197190

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