CODEWITHSUNDEEP
pythontclnuke
andio
andio

Reputation: 1778

How to evaluate a string as tcl command

I'm using Foundry Nuke and try to work with tcl command.

I have this code :

[lindex [split "xx_cc" "_"] 0]

If I put this code into a text node. I will output the correct result which is 'xx'

But in this case I put the code in the project setting (root) as a string . I added a new knob (named as 'cxproject' and type is text input knob). Then put the code in this knob ( as string)

Then in the a text node , I put this code :

[value root.cxproject]

Trying to load the code and evaluate that string to be executed as tcl command.

The result is the original string of the code itself -> [lindex [split "xx_cc" "_"] 0] . This is not what I want. I want to see the result as 'xx'.

I tried :

[eval [value root.cxproject] ]

but not working.

How to evaluate a string as tcl command using tcl script ?

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Upvotes: 0

Views: 145

Answers (1)

Chris Heithoff
Chris Heithoff

Reputation: 1873

Using eval $string is exactly what you should do.

Can you please share exactly what [value root.cxproject] returns?

It might be possible that you have too many square brackets.
For example:
eval {expr 1+1} will return 2.

but eval [expr 1+1] will yield the error message invalid command name "2"

Upvotes: 0

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