Conditional Statements and Version Numbers

[Ken Ray]

On Tue, 24 Apr 2007 02:15:38 +1000, Scott Kane wrote:

> G'day,
> 
> In some other programming languages it's possible to use conditional 
> defines to conditionally run parts of your code.  This is particuarly 
> useful when done in combination with version or build numbers.  I 
> can't seem to find similar methods in Rev.  That is to say I can't 
> find conditional defines or the ability to get a stand alones version 
> or build number (though I can certainly find out the version or build 
> of the Rev engine used to built it).

Well, the standalone's version or build number as defined in the 
Standalone Builder is stored in a custom property set of your stack 
called "cRevStandaloneSettings". So for example, to get the version 
number (under Windows), you'd do this:

  put the cRevStandaloneSettings["Windows,productversion1"] of this 
stack into tDigit1  --major
  put the cRevStandaloneSettings["Windows,productversion2"] of this 
stack into tDigit2  --minor
  put the cRevStandaloneSettings["Windows,productversion3"] of this 
stack into tDigit3  --cosmetic
  put the cRevStandaloneSettings["Windows,productversion4"] of this 
stack into tDigit4  --build
  put tDigit1 & "." & tDigit2 & "." & tDigit3 & "." & tDigit4 into 
tVersionNumber

So if I wanted to have code that only applied to version 2.0.0.0 or 
higher of my app, I could say:

  if (the cRevStandaloneSettings["Windows,productversion1"] of this 
stack) >= 2 then
    -- do my stuff
  end if

Or if I've already retrieved the values as outlined above, I could just 
say:

  if tDigit1 >=2 then
    -- do my stuff
  end if

HTH,