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ObjectType Error 1690 Ole Unable to Perform Enumeration of the Specified Object

 Keywords:  Arrayize Empty ObjectType Error 1690 OLE Unable Perform Enumeration Specified Object Safe Array Variant

Question:

   arrNodes = ObjectType ("ARRAY", Arrayize ("1", @TAB))
   ForEach intNode In arrNodes
      ; do something
   Next

   arrNodes = ObjectType ("ARRAY", Arrayize ("", @TAB)) ; Error 1690.
   ForEach intNode In arrNodes
      ; do something
   Next

Answer:

The error is actually caused by the empty array generated by the "Arrayize" function and is related to the fact that WinBatch's list implementation does not make it possible to distinguish between an empty list and a list of one empty item. That subject has already been flogged to death.

If a change were to be made to the "ObjectType" function, it would be to cause the function to error when you attempt to create an empty safe array. The COM Automation specification for safe array's states that element types of VT_EMPTY and VT_NULL are not valid. "ObjectType" currently fudges this by creating a no element safe array with an element type of "VT_VARIANT" but this element type setting is not the cause of the enumeration error. The fact that the array has no elements is the cause of that error.

Article ID:   W17663

Filename:   ObjectType Error 1690 Ole Unable to Perform Enumeration of the Specified Object.txt

File Created: 2011:12:20:10:23:24

Last Updated: 2011:12:20:10:23:24