XL97: Conditional Compilation Code Lost With 5.0/95 Format (161959)

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You can use conditional compilation, using #If ... Then ... #Else directives, to run blocks of code selectively. This is typically used in cross-platform Sub procedures. The #If ... Then ... #Else directives evaluate expressions containing conditional compiler constants to determine what code to execute in the macro.

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 the Microsoft fee-based consulting line at (800) 936-5200. For more information about Microsoft Certified Partners, please visit the following Microsoft Web site: For more information about the support options that are available and about how to contact Microsoft, visit the following Microsoft Web site: The following macro provides an example of using conditional compilation:

1. Save and close any open workbooks and then open a new workbook.
2. Start the Visual Basic Editor (press ALT+F11).
3. On the Insert menu click Module.
4. In the module, type the following code:

         #Const test = 1
   
         Sub Cond_Comp()
   
             #If test Then
                 MsgBox "test evaluates to True"
   
             #Else
                 MsgBox "test evaluates to False"
   
             #End If
   
         End Sub
   						

5. Run the Cond_Comp macro.
   
   Because the conditional compilation constant "test" has a value of 1, a message box will display the message "test evaluates to True".
6. Change the first line of code in the module to:

         #Const test = 0

7. Run the Cond_Comp macro.
   
   A message box will display the message "test evaluates to False".

Conditional compilation constants can also be specified in the Project Properties dialog box instead of in a module. To use this technique in the previous example, follow these steps:

1. Comment the first line in the module so that it looks like the following:

         '#Const test = 0

2. On the Tools menu, click VBAProject Properties and click the General tab.
3. In the Conditional Compilation Arguments box, type the following:

         test = 1

4. Click OK.
5. Run the Cond_Comp macro.

Because the conditional compilation constant "test" has a value of 1, a message box displays the message "test evaluates to True".

NOTE: If you want to specify more than one conditional compilation constant in the Conditional Compilation Arguments box, use a colon (:) as a separator. For example, you would type the following into the Conditional Compilation Arguments box:

   first = 1 : second = 0