Set Const Conditionally at compile time in VBA

I'd like to set the value of a const variable conditionally at Compile time. I thought i could achieve this using vba compiler directives #If #Else etc. as below, but have been unsuccessful so far:

#If Environ("username") = "myusername" Then

    Public Const ErrorHandling As Boolean = False

#Else

    Public Const ErrorHandling As Boolean = True

#End If

When i run this code, im getting an error that the Environ variable is undefined.
Would something like this even be possible? Or do i just have to make my 'ErrorHandling' variable Public (not Const), and set it at the initialisation of my code?

Thanks in advance,
cjk

asked Nov 20 '18 at 20:34

c jk

236

Precompiler directives are evaluated before compilation; any function that's defined in a referenced type library (like VBA.Interaction.Environ) effectively doesn't exist yet at that point.
– Mathieu Guindon
Nov 20 '18 at 21:29

add a comment |

I'd like to set the value of a const variable conditionally at Compile time. I thought i could achieve this using vba compiler directives #If #Else etc. as below, but have been unsuccessful so far:

#If Environ("username") = "myusername" Then

    Public Const ErrorHandling As Boolean = False

#Else

    Public Const ErrorHandling As Boolean = True

#End If

asked Nov 20 '18 at 20:34

c jk

236

Precompiler directives are evaluated before compilation; any function that's defined in a referenced type library (like VBA.Interaction.Environ) effectively doesn't exist yet at that point.
– Mathieu Guindon
Nov 20 '18 at 21:29

add a comment |

I'd like to set the value of a const variable conditionally at Compile time. I thought i could achieve this using vba compiler directives #If #Else etc. as below, but have been unsuccessful so far:

#If Environ("username") = "myusername" Then

    Public Const ErrorHandling As Boolean = False

#Else

    Public Const ErrorHandling As Boolean = True

#End If

asked Nov 20 '18 at 20:34

c jk

236

I'd like to set the value of a const variable conditionally at Compile time. I thought i could achieve this using vba compiler directives #If #Else etc. as below, but have been unsuccessful so far:

#If Environ("username") = "myusername" Then

    Public Const ErrorHandling As Boolean = False

#Else

    Public Const ErrorHandling As Boolean = True

#End If

excel vba excel-vba excel-2010

asked Nov 20 '18 at 20:34

c jk

236

asked Nov 20 '18 at 20:34

c jk

236

asked Nov 20 '18 at 20:34

c jk

236

asked Nov 20 '18 at 20:34

c jk

236

asked Nov 20 '18 at 20:34

c jk

236

Precompiler directives are evaluated before compilation; any function that's defined in a referenced type library (like VBA.Interaction.Environ) effectively doesn't exist yet at that point.
– Mathieu Guindon
Nov 20 '18 at 21:29

add a comment |

Precompiler directives are evaluated before compilation; any function that's defined in a referenced type library (like VBA.Interaction.Environ) effectively doesn't exist yet at that point.
– Mathieu Guindon
Nov 20 '18 at 21:29

Precompiler directives are evaluated before compilation; any function that's defined in a referenced type library (like VBA.Interaction.Environ) effectively doesn't exist yet at that point.
– Mathieu Guindon
Nov 20 '18 at 21:29

add a comment |

1 Answer
1

active

oldest

votes

You can only use constants in the conditional if statement. Either you set it in the VBAProject Properties, explained here, or in your code.

Sub TestIt()

#Const Errorhandling = False



    #If Errorhandling Then

        Debug.Print "Error on"

    #Else

        Debug.Print "Error off"

    #End If



End Sub

You find further documentation here and a page on pre-defined constants

Update: As Comintern pointed out correctly my statememt only constants is not completely true, see section 5.6.16.2 of the language spec

edited Nov 20 '18 at 21:14

answered Nov 20 '18 at 20:54

Storax

4,0833518

2

This is not strictly true. There is a small subset of functions that can be used, as described in section 5.6.16.2 of the language spec.
– Comintern
Nov 20 '18 at 21:07

@Comintern: Thanks! I did not know that.
– Storax
Nov 20 '18 at 21:09

ok, thanks. So my best option is probably to build my conditions into the initialisation of the code. (Interesting how you can use the vba project properties for const declaration as well...)
– c jk
Nov 20 '18 at 21:20

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

You can only use constants in the conditional if statement. Either you set it in the VBAProject Properties, explained here, or in your code.

Sub TestIt()

#Const Errorhandling = False



    #If Errorhandling Then

        Debug.Print "Error on"

    #Else

        Debug.Print "Error off"

    #End If



End Sub

You find further documentation here and a page on pre-defined constants

Update: As Comintern pointed out correctly my statememt only constants is not completely true, see section 5.6.16.2 of the language spec

edited Nov 20 '18 at 21:14

answered Nov 20 '18 at 20:54

Storax

4,0833518

2

This is not strictly true. There is a small subset of functions that can be used, as described in section 5.6.16.2 of the language spec.
– Comintern
Nov 20 '18 at 21:07

@Comintern: Thanks! I did not know that.
– Storax
Nov 20 '18 at 21:09

ok, thanks. So my best option is probably to build my conditions into the initialisation of the code. (Interesting how you can use the vba project properties for const declaration as well...)
– c jk
Nov 20 '18 at 21:20

add a comment |

You can only use constants in the conditional if statement. Either you set it in the VBAProject Properties, explained here, or in your code.

Sub TestIt()

#Const Errorhandling = False



    #If Errorhandling Then

        Debug.Print "Error on"

    #Else

        Debug.Print "Error off"

    #End If



End Sub

You find further documentation here and a page on pre-defined constants

Update: As Comintern pointed out correctly my statememt only constants is not completely true, see section 5.6.16.2 of the language spec

edited Nov 20 '18 at 21:14

answered Nov 20 '18 at 20:54

Storax

4,0833518

2

This is not strictly true. There is a small subset of functions that can be used, as described in section 5.6.16.2 of the language spec.
– Comintern
Nov 20 '18 at 21:07

@Comintern: Thanks! I did not know that.
– Storax
Nov 20 '18 at 21:09

ok, thanks. So my best option is probably to build my conditions into the initialisation of the code. (Interesting how you can use the vba project properties for const declaration as well...)
– c jk
Nov 20 '18 at 21:20

add a comment |

You can only use constants in the conditional if statement. Either you set it in the VBAProject Properties, explained here, or in your code.

Sub TestIt()

#Const Errorhandling = False



    #If Errorhandling Then

        Debug.Print "Error on"

    #Else

        Debug.Print "Error off"

    #End If



End Sub

You find further documentation here and a page on pre-defined constants

Update: As Comintern pointed out correctly my statememt only constants is not completely true, see section 5.6.16.2 of the language spec

edited Nov 20 '18 at 21:14

answered Nov 20 '18 at 20:54

Storax

4,0833518

You can only use constants in the conditional if statement. Either you set it in the VBAProject Properties, explained here, or in your code.

Sub TestIt()

#Const Errorhandling = False



    #If Errorhandling Then

        Debug.Print "Error on"

    #Else

        Debug.Print "Error off"

    #End If



End Sub

You find further documentation here and a page on pre-defined constants

Update: As Comintern pointed out correctly my statememt only constants is not completely true, see section 5.6.16.2 of the language spec

edited Nov 20 '18 at 21:14

answered Nov 20 '18 at 20:54

Storax

4,0833518

edited Nov 20 '18 at 21:14

answered Nov 20 '18 at 20:54

Storax

4,0833518

answered Nov 20 '18 at 20:54

Storax

4,0833518

answered Nov 20 '18 at 20:54

Storax

4,0833518

2

This is not strictly true. There is a small subset of functions that can be used, as described in section 5.6.16.2 of the language spec.
– Comintern
Nov 20 '18 at 21:07

@Comintern: Thanks! I did not know that.
– Storax
Nov 20 '18 at 21:09

ok, thanks. So my best option is probably to build my conditions into the initialisation of the code. (Interesting how you can use the vba project properties for const declaration as well...)
– c jk
Nov 20 '18 at 21:20

add a comment |

2

This is not strictly true. There is a small subset of functions that can be used, as described in section 5.6.16.2 of the language spec.
– Comintern
Nov 20 '18 at 21:07

@Comintern: Thanks! I did not know that.
– Storax
Nov 20 '18 at 21:09

ok, thanks. So my best option is probably to build my conditions into the initialisation of the code. (Interesting how you can use the vba project properties for const declaration as well...)
– c jk
Nov 20 '18 at 21:20

This is not strictly true. There is a small subset of functions that can be used, as described in section 5.6.16.2 of the language spec.
– Comintern
Nov 20 '18 at 21:07

@Comintern: Thanks! I did not know that.
– Storax
Nov 20 '18 at 21:09

ok, thanks. So my best option is probably to build my conditions into the initialisation of the code. (Interesting how you can use the vba project properties for const declaration as well...)
– c jk
Nov 20 '18 at 21:20

add a comment |

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