Macros are often used to slice, dice, and otherwise process information contained in workbooks. This presumes, of course, that the workbook that contains the information is actually open. If it is not, then your macro will obviously need to include code to actually open the needed workbook.
Opening a workbook can really slow down a macro; it takes time to access the disk and load the file. Thus, if your macro can check to see if a workbook is open before going through the hassle of actually trying to open it, you could speed up your macros greatly if the workbook is found to already be open.
One very flexible way to approach the task of checking whether a workbook is open is to use a function that does the checking, and then simply returns a TRUE or FALSE value based on whether the workbook is open. The following short macro performs this succinct task:
Function AlreadyOpen(sFname As String) As Boolean Dim wkb As Workbook On Error Resume Next Set wkb = Workbooks(sFname) AlreadyOpen = Not wkb Is Nothing Set wkb = Nothing End Function
To use the function, just pass it the name of the workbook you want to check, in the following manner:
sFilename = "MyFileName.xls" sPath = "C:\MyFolder\MySubFolder\" If AlreadyOpen(sFilename) Then 'Do not have to open Else Workbooks.Open sPath & sFilename End If
Note:
ExcelTips is your source for cost-effective Microsoft Excel training. This tip (3104) 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: Checking if a Workbook is Already Open.
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!
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