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BOOK: Beginning Access VBA
This is the forum to discuss the Wrox book Beginning Access 2002 VBA by Robert Smith, Dave Sussman, Ian Blackburn, John Colby, Mark Horner, Martin Reid, Paul Turley, Helmut Watson; ISBN: 9780764544026
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Old December 26th, 2003, 07:00 PM
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Default Beg Access 2002 VBA chap 6 Capitilzation

Capitalize Procedure exercise

I keep getting a
Run-time error '94': Invalid use of Null
when I run this exercise.

Debug goes to this line: rec(strFld) = UCase$(rec(strFld))

My code is below.

Function Capitalize(strTable As String, strFld As String)

Dim db As Database
Dim rec As Recordset

Set db = CurrentDb()
Set rec = db.OpenRecordset(strTable)

Do While Not rec.EOF
    rec(strFld) = UCase$(rec(strFld))

Capitalize = True

End Function

I call the procedure with
? capitalize ("tblCompany", "Country")

When I step through it the locals window shows

Expression: Capitalize
Value: empty
Type: variable

Thanks for any help

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Old December 26th, 2003, 11:57 PM
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I copied your code verbatim, executing it against the database off the Access 2002 VBA cd, and it executed fine.

I did also however go into the table tblCompany and cleared out the country name in a couple of records. When I ran the code again, I do get the error.

My assumption is that this is either a normal error returned by the UCase function if the field it encounters is null, or, that there is a level of error checking being performed, which will return errors in this type of situation (my thought being the level could be changed to not return errors when a null field is encountered).

I'd double-check the records in tblCompany. You could also type a Debug command in the immediate window to determine on what record the error is occurring. For example

debug.Print rec("CompanyID").

I hope this helps.
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