Visual Basic for Applications defines constants for exclusive use with the #If...Then...#Else directive. These constants are functionally equivalent to constants defined with the #If...Then...#Else directive except that they are global in scope; that is, they apply everywhere in a project.
Because Win32 returns True in both 32-bit and 64-bit development platforms, it is important that the order within the #If...Then...#Else directive returns the desired results in your code. For example, because Win32 returns True in 64-bit (Win32 is compatible in Win64 environments), checking for Win32 before Win64 results in the Win64 condition never running because Win32 returns True. The following order returns predictable results (this applies to both Winx and VBAx constants):
#If Win64 Then
' Win64=true, Win32=true, Win16= false
#ElseIf Win32 Then
' Win32=true, Win16=false
#Else
' Win16=true
#End IfOn 16-bit development platforms, the compiler constants are defined as follows.
| Constant | Value | Indicates that the development environment... |
|---|---|---|
| Win16 | True | Is 16-bit compatible. |
| Win32 | False | Is not 32-bit compatible. |
| Win64 | False | Is not 64-bit compatible. |
On 32-bit development platforms, the compiler constants are defined as follows.
| Constant | Value | Indicates that the development environment... |
|---|---|---|
| Vba6 | True | Is Visual Basic for Applications, version 6.0 compatible. |
| Vba6 | False | Is not Visual Basic for Applications, version 6.0 compatible. |
| Vba7 | True | Is Visual Basic for Applications, version 7.0 compatible. |
| Vba7 | False | Is not Visual Basic for Applications, version 7.0 compatible. |
| Win16 | False | Is not 16-bit compatible. |
| Win32 | True | Is 32-bit compatible. |
| Win64 | False | Is not 64-bit compatible. |
| Mac | True | Is Macintosh. |
| Mac | False | Is not Macintosh. |
On 64-bit development platforms, the compiler constants are defined as follows.
| Constant | Value | Indicates that the development environment... |
|---|---|---|
| Vba6 | True | Is Visual Basic for Applications, version 6.0 compatible. |
| Vba6 | False | Is not Visual Basic for Applications, version 6.0 compatible. |
| Vba7 | True | Is Visual Basic for Applications, version 7.0 compatible. |
| Vba7 | False | Is not Visual Basic for Applications, version 7.0 compatible. |
| Win16 | False | Is not 16-bit compatible. |
| Win32 | True | Is 32-bit compatible. |
| Win64 | True | Is 64-bit compatible. |
| Mac | True | Is Macintosh. |
| Mac | False | Is not Macintosh. |
These constants are provided by Visual Basic, so you cannot define your own constants with these same names at any level.