This thread is for discussions of CopyMemory and Arrays: Proper Use.

I'm willing to bet that if he first variable in the UDT had been an integer, the following Bytes would have been padded to WORD size and no more.

This being the start of the week-end, I'll play with this later...

I just tested and yes, you are correct.

Private Type MyType
   var1 As Integer
   var2 As Byte
   var3 As Boolean
End Type

The above type will get padded to a WORD, not a DWORD.  However, starting with a WORD is not enough.  The following will get DWORD-aligned, meaning you must not have DWORDS or QWORDS.

Private Type MyType
   var1 As Integer
   var2 As Byte
   var3 As Long
End Type

Private Type MyType
   var1 As Integer
   var2 As Byte
   var3 As Double
End Type

Private Type MyType
   var1 As Integer
   var3 As Double
End Type

Thanks for the observation.  I will update the article to add the finding.

Thanks. Definately some good information, however...

It is not very practical to use the ReDim statement each iteration of a loop since it copies the entire array to a different memory location in order to change the dimension. In fact, using the CopyMemory function for this purpose is useful as well. A good compromise would be to redimension the array every 20th iteration and then check for empty array values, such as:

If SubDirCount = UBound(DirList) Then ReDim Preserve DirList(UBound(DirList) + 20)

an even better solution is to use an array object.