XL97: Illegal Operation Unhiding a Row with a Macro (159947)

SYMPTOMS

When you run a Visual Basic for Applications macro in Microsoft Excel 97, if the macro contains a command that unhides a row in a worksheet, you may receive the following error message:

This program has performed an illegal operation and will be shut down. If the problem persists, contact the program vendor.

If you click Details, you receive the following error message:

EXCEL caused an invalid page fault in module EXCEL.EXE at 014f:30111ca6.

CAUSE

This problem may occur when the worksheet contains a very large number of hidden rows (usually, greater than 32768 rows) and you attempt to unhide a row by setting the Hidden property of the row to False. The following is an example of code that may cause the macro to fail:

   Selection.EntireRow.Hidden = False

WORKAROUND

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To prevent this problem from occurring, do not set the Hidden property of an entire row to False if a very large number of rows are hidden in the worksheet. Instead, set the RowHeight property of the row equal to an appropriate value. For example, to set the height of a hidden row to 12, use the following line of code:

   Selection.EntireRow.RowHeight = 12

Alternatively, use the following line of code:

   Selection.EntireRow.RowHeight = Selection.Offset(-1, 0).RowHeight

This code sets the height of the hidden row equal to the height of the row immediately above it.

MORE INFORMATION

You can use the Hidden property whenever you want to hide or unhide an entire row or column in a worksheet. For example, to hide the row that contains the active cell, use the following line of code:

   ActiveCell.EntireRow.Hidden = True

To unhide a hidden row, set the Hidden property for that row to False. To do this, use the following line of code:

   ActiveCell.EntireRow.Hidden = False