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Date: 12 March 2001
From: Howard Kaikow <firstname.lastname@example.org>
Subject: WordBasic is broken in VBA
When you open a Word 6/7 template in Word 8, or later version, Word attempts to automatically convert the WordBasic macros to VBA macros.
Much of this is done by using the WordBasic object to run the WordBasic commands. For example, if your WordBasic macro included an InsertPara statement, Word would convert this to WordBasic.InsertPara. Looks simple, don't be fooled.
It would be reasonable to expect that any WordBasic command executed via the WordBasic object would use the same semantics as if the command had been executed in Word 6/7. Alas, that is not true.
Here are some examples of conversion problems:
Many WordBasic macros clear the undo stack by toggling Mark Revisions (see Microsoft Knowledge Base article Q118987, or page 249 of the 3rd edition of the Microsoft Press Word Developer's Kit). This just does not work in VBA. The automatic conversion results in:
Option Explicit Public Sub MAIN() Dim SaveMarkRevisions Dim dlg As Object: Set dlg = WordBasic.DialogRecord.ToolsRevisions(False) SaveMarkRevisions = dlg.MarkRevisions WordBasic.ToolsRevisions MarkRevisions:=Abs(SaveMarkRevisions - 1) WordBasic.ToolsRevisions MarkRevisions:=SaveMarkRevisions End Sub
Which gives one the false impression that the code was successfully converted. However, the deed does not get done at run time and our friend "insufficient memory" attacks us.
I suspect that most programmers would convert the code to native VBA, using the suggestions in the Word Help topic Visual Basic Equivalents for WordBasic Commands. What is needed instead is to use an entirely different VBA statement, ActiveDocument.UndoClear.
This is a critical piece of code to have its functionality changed via the WordBasic object
The importing of WordBasic fails syntactically/semantically. For example:
Even though I require explicit declaration of variables, and the required Option Explicit statements are included, I've seen VBA get quite creative.
At least two conversions, resulted in the creation of a variable name that was nowhere used in the macros and, to make it worse, a DIM statement was not included for the variable. This resulted in a compile error when I tried to execute the code.
Certain statements executed via the WordBasic object do not use the same semantics as in Word 6/7.
One case that caught me was TableMergeCells. WordBasic's TableMergeCells allows only horizontal merging, while VBA allows vertical merging as well. Alas, I found that if you have a WordBasic TableMergeCells statement that merges, say, 2 adjacent columns, the converted code collapses all cells into a single cell. This works in WordBasic, but not in VBA.
There are more serious cases of such differences. Just beware that syntactic conversion does not mean semantic conversion.
Certain statements, executed via the WordBasic object do not produce correct results. One example is WordBasic.Files$(PathName$). If PathName$ includes a space, the result is incorrect. This is described in Microsoft Knowledge Base article q167387.
Certain statements, executed via the WordBasic object are no-ops, i.e., they do not do anything. One example is WordBasic.WaitCursor 1 (see Microsoft Knowledge Base article q177619).
There are a number of undocumented tricks that are often used in WordBasic macros. Some of these do not work in VBA. One example is using an empty string to terminate a list used in a ListBoxArray. That no longer works.
WordBasic was more forgiving in allowing us to omit optional parameters for certain commands. In some sense, these were bugs in our WordBasic macros, but people used them as undocumented features. VBA is not so forgiving.
For economic reasons, there is a need to be able to use many/most WordBasic macros, as automatically imported into VBA, without fully converting them to native VBA code. Problems such as those I listed prevent this from happening without also changing the original WordBasic code to achieve the same results in WordBasic and VBA.
In many cases, WordBasic code will be converted entirely to VBA, and never look back. In so doing care must be taken to not be so automatic about converting the code. It will be necessary to use different techniques in the VBA code, in some cases, resulting in significant changes to the algorithms used by your macros.