Please Note: This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Excel, click here: Self-Aware Macros.

Self-Aware Macros

by Allen Wyatt
(last updated October 6, 2021)

For some macros you may need to determine if there is a way to determine the particular machine on which the macro is operating. For instance, you may have a desktop PC that has a particular directory at D:\OraNT\Plus33, while your notebook PC has the directory at C:\OraNT\Plus33. The macro, of course, needs to detect which machine is in use so that it knows which directory to use for its processing.

There are different ways that this task can be approached. It is possible to create an Excel macro that actually accesses the Windows API and determines the name of the computer on which it is running. Such an approach can get quite involved, however.

An easier way is to just use VBA's DIR command to determine where the desired directory exists. The following will do the trick:

Sub OracleQueries()
    Dim sTemp As String
    Dim sGoodPath As String

    sGoodPath = "D:\OraNT\Plus33\"
    sTemp = Dir("D:\OraNT\Plus33\nul")
    If sTemp = "" Then
        sGoodPath = "C:\OraNT\Plus33\"
        sTemp = Dir("C:\OraNT\Plus33\nul")
    End If

    'Now have directory information
    If sTemp <> "" Then
        'Process queries using sGoodPath
    Else
        MsgBox "Directories not found!"
    End If
End Sub

Notice how the DIR function is used in this example. Normally DIR returns the name of the first file it finds in the requested directory. If the directory is empty, however, DIR returns an empty string—even if the directory actually exists. Since all we want to do is find out if the directory exists (not if there are files in it), it is necessary to append the letters "nul" at the end of the directory path used by DIR. This causes DIR to return an empty string if the directory is not located, or else the characters "nul" if it is (even if the directory is empty).

Toward the end of the macro, sTemp will be empty if neither directory could be located. If one of them was located, then sTemp will not be empty, and sGoodPath will be set to the directory name that can be used in further processing.

Note:

If you would like to know how to use the macros described on this page (or on any other page on the ExcelTips sites), I've prepared a special page that includes helpful information. Click here to open that special page in a new browser tab.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (2607) applies to Microsoft Excel 97, 2000, 2002, and 2003. You can find a version of this tip for the ribbon interface of Excel (Excel 2007 and later) here: Self-Aware Macros.

Author Bio

Allen Wyatt

With more than 50 non-fiction books and numerous magazine articles to his credit, Allen Wyatt is an internationally recognized author. He is president of Sharon Parq Associates, a computer and publishing services company. ...

MORE FROM ALLEN

Getting a Double-Spaced Printout

When working with printed documents, many people prefer to see the document double-spaced. If you have a single-spaced ...

Discover More

Picking a Contiguous Range of Table Cells

Creating a table in Word is a relatively simple task. When you want to format or edit information in the table, often the ...

Discover More

Using the Keyboard to Control Page Display in Print Preview

Sometimes it is just easier to use the keyboard than it is to use the mouse. If you are a keyboard-oriented person, you ...

Discover More

Comprehensive VBA Guide Visual Basic for Applications (VBA) is the language used for writing macros in all Office programs. This complete guide shows both professionals and novices how to master VBA in order to customize the entire Office suite for their needs. Check out Mastering VBA for Office 2010 today!

More ExcelTips (menu)

Using BIN2DEC In a Macro

Need a way, in a macro, to convert binary numbers into their decimal equivalents? There are two ways you can get the ...

Discover More

Easily Adding Blank Rows

Want to add a bunch of blank rows to a your data and have those rows interspersed among your existing rows? Here's a ...

Discover More

Making a Cell's Contents Italics within a Macro

You can use macros to process information in your worksheets. You may want to use that macro to apply the italic ...

Discover More
Subscribe

FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."

View most recent newsletter.

Comments

If you would like to add an image to your comment (not an avatar, but an image to help in making the point of your comment), include the characters [{fig}] (all 7 characters, in the sequence shown) in your comment text. You’ll be prompted to upload your image when you submit the comment. Maximum image size is 6Mpixels. Images larger than 600px wide or 1000px tall will be reduced. Up to three images may be included in a comment. All images are subject to review. Commenting privileges may be curtailed if inappropriate images are posted.

What is 3 - 3?

There are currently no comments for this tip. (Be the first to leave your comment—just use the simple form above!)


This Site

Got a version of Excel that uses the menu interface (Excel 97, Excel 2000, Excel 2002, or Excel 2003)? This site is for you! If you use a later version of Excel, visit our ExcelTips site focusing on the ribbon interface.

Newest Tips
Subscribe

FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."

(Your e-mail address is not shared with anyone, ever.)

View the most recent newsletter.