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How to resolve variable within a variable

 
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MikeG



Joined: 23 Apr 2004
Posts: 34
Location: Adelaide, South Australia
PostPosted: Mon Aug 09, 2004 3:59 am    Post subject: How to resolve variable within a variable Reply with quote
Can anybody help witth this problem? Although this example specifically refers to SoundPlay it's a more generic question that could apply to many things.

Code:
; retrieve system default sound
RegRead,X,HKCU,AppEvents\Schemes\Apps\.Default\.Default\.current

; Try to play the sound - this doesn't work!
; Note: variable X contains %SystemRoot%\media\Windows XP Ding.wav
; This needs to somehow be resolved to C:\Windows\media\Windows XP Ding.wav
SoundPlay,%X%

; I could do an ugly hack like this, but is there a better, more generic way to resolve variables within variables?
StringReplace,X,X,`%SystemRoot`%,%SystemRoot%
SoundPlay,%X%
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WhiteCloud



Joined: 19 Jun 2004
Posts: 68
PostPosted: Mon Aug 09, 2004 6:10 am    Post subject: Reply with quote
Add this line

StringTrimRight, dereffed_var, referenced_var, 0

^that's the only way to do it. It'd be good to work that into the documentation somewhere. Or use any other command that uses variables out and in.
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Chris
Site Admin


Joined: 02 Mar 2004
Posts: 10464
PostPosted: Mon Aug 09, 2004 11:58 am    Post subject: Reply with quote
Good suggestion.

Quote:
I could do an ugly hack like this, but is there a better, more generic way to resolve variables within variables?
StringReplace,X,X,`%SystemRoot`%,%SystemRoot%

That too should work, and both are "ugly". In a future version, I'll try to include something like Gui4Cli's DeepTrans option, which allows variable references contained inside other variable references to be resolved.

Since there's a danger of infinite recursion, I should probably have it stop at 1 extra level of resolution, or have the depth configurable.
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Chris
Site Admin


Joined: 02 Mar 2004
Posts: 10464
PostPosted: Mon Aug 09, 2004 7:31 pm    Post subject: Reply with quote
Update: I've added a command to accomplish this in the latest version. Please give it a try and let me know if you spot and problems or improvements for it.

Example:
Transform, X, deref, %X% ; Dereference the contents of X.
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MikeG



Joined: 23 Apr 2004
Posts: 34
Location: Adelaide, South Australia
PostPosted: Tue Aug 10, 2004 12:00 am    Post subject: Problem solved Reply with quote
I couldn't get it to work with StringTrimRight, but the new Transform command works. Thanks Smile
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