XL2000: How to Determine Which DLLs Are Registered

In Microsoft Excel you can programmatically list the dynamic link library (DLL and XLL) files that provide functions registered in Excel.

This article describes a sample macro that creates a three-column array of all registered functions in Microsoft Excel, where column 1 displays the name of the DLL or code resource; column 2 displays the name of the procedure in the DLL or code resource; and column 3 displays strings specifying the data types of the return values, and the number and data types of the arguments.

Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support professionals can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs.
If you have limited programming experience, you may want to contact a Microsoft Certified Partner or Microsoft Advisory Services. For more information, visit these Microsoft Web sites:

Microsoft Certified Partners - https://partner.microsoft.com/global/30000104

Microsoft Advisory Services - http://support.microsoft.com/gp/advisoryservice

For more information about the support options that are available and about how to contact Microsoft, visit the following Microsoft Web site:http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS To create and run a Microsoft Visual Basic for Application sample Sub procedure that can list all of the DLL and XLL files that are registered in Excel, use the following steps:

1. Start Excel.
2. Press ALT+F11 to start the Visual Basic editor.
3. On the Insert menu, click Module.
4. Type the following code in the Module sheet:

   Sub DLLList()
      theArray = Application.RegisteredFunctions
         If IsNull(theArray) Then
            MsgBox "No registered functions"
         Else
         Cells(1, 1).Value = "DLL Name"
         Cells(1, 2).Value = "Procedure Name"
         Cells(1, 3).Value = "Data Type Returned"
         For i = 1 To UBound(theArray)
            For j = 1 To 3
               Cells(i + 1, j).Formula = theArray(i, j)
            Next j
         Next i
      End If
   End Sub
   					

5. Press ALT+F11 to return to Excel.
6. On the Tools menu, point to Macro, and then click Macros.
7. In the Macro name list, click DLLList, and then click Run.