Constants Help

[rfresh]

I've seen B4A Constants written like this:

vbCRLF CRLF = Chr(10)

...but I can't find anything that explains what vbCRLF and CRLF are? I'm not used to seeing two definations when defining a Constant. Why does B4A have two?

Thanks...

 

[NJDude]

Check THIS not sure if it's explained somewhere in that post.

 

[rfresh]

It has this (which I've seend before)

Constants:---------
"" Quote = Chr$(34)
vbCr CRLF = Chr$(10)
vbCrLf none

but doesn't explain why we have a cbCr and a CRLF on one line to define a consant. Which one do you use? The vbCR or the CRLF? Or either?

 

[nfordbscndrd]

It has this (which I've seend before)

Constants:---------
"" Quote = Chr$(34)
vbCr CRLF = Chr$(10)
vbCrLf none

but doesn't explain why we have a cbCr and a CRLF on one line to define a consant. Which one do you use? The vbCR or the CRLF? Or either?

The document in that post shows, as explained in the post, the B4A equivalents of some VB6 (Visual Basic 6) functions. The VB6 code is in the left column and the B4A column is on the right, so the vbCR is VB6 code and CRLF is B4A, etc.

 

[rfresh]

Ok so that means for B4A we just declare like this:

CRLF = Chr$(10)

...if we don't need vb6?

 

[nfordbscndrd]

Ok so that means for B4A we just declare like this:

CRLF = Chr$(10)

...if we don't need vb6?

You don't need to declare CRLF. It is a "constant", which means that its value is already set as "carriage return, line feed".

You don't *need* vb6 for coding B4A. The chart you referred to is to aid VB6 programmers (for Windows) who are learning B4A. The chart converts VB6 code (or functions) to B4A code/functions. If you are not a VB6 programmer, you don't need the chart since you would not care about converting VB6 to B4A.

As for CRLF, here is an example:

Label.Text = "Line 1" & CRLF & "Line 2"

 

[rfresh]

Ok so CFLF is already pre-declared but what about Constants that are custom to my app?

DEFAULT_BUTTON = 1

If I wanted to use the above constant, how would I declare it?

It shows up in red in the IDE and won't compile.

 

[JonPM]

You have to dim it like other variables

 

[rfresh]

You have to dim it like other variables

Nope:

Dim DEFAULT_BUTTON = 50

The name remains in red and won't compile.

 

[NJDude]

The right way to DIM is like this:

Dim DEFAULT_BUTTON As Int

DEFAULT_BUTTON = 50

You better read the Beginner's Guide

 

[rfresh]

That's not a Constant because I can change it's value. It's just a normal variable. Constants (in other languages) cannot be changed.

If that is how B4A implements 'Constants' then it's not really a constant.

But thanks very much for your help.

 

[nfordbscndrd]

That's not a Constant because I can change it's value. It's just a normal variable. Constants (in other languages) cannot be changed.

If that is how B4A implements 'Constants' then it's not really a constant.

You are correct that while B4A has some built-in constants, such as CRLF, B4A does not support user-defined constants.

You might want to precede names of variables which you don't want changed with "cons", such as --

Dim consInt_SomeName1 As Int
Dim consStr_SomeName2 As String
etc.

 

[rfresh]

Thanks, so that answers my question. Your naming suggestion is a good one when I need to create a B4A 'Constant'.