How to insert a variable in a command? Please tell me how to use T_T

Hello,

It looks like that you are trying to access a given property using a variable to hold the property name. When you use the ->  and ~> operators to set/retrieve given properties everything is treated as a literal (symbol). In case you want to use a variable for the property entry in your example you need to switch to a get structure at the given place. In your example the following should work:

test_aaa = "schSelectToolbar_10"

test_ins = "instances"

[ command : get(get(swindow(num_wid)->hiToolbars test_aaa) test_ins)->checked=t ]

Regards,

Petar

Hello,

It looks like that you are trying to access a given property using a variable to hold the property name. When you use the ->  and ~> operators to set/retrieve given properties everything is treated as a literal (symbol). In case you want to use a variable for the property entry in your example you need to switch to a get structure at the given place. In your example the following should work:

test_aaa = "schSelectToolbar_10"

test_ins = "instances"

[ command : get(get(swindow(num_wid)->hiToolbars test_aaa) test_ins)->checked=t ]

Regards,

Petar

Thank you very much !!!  p94todorov !!

Thanks to yout help, the command work normally.

And I have 1 question,

you changed "swindow(num_wid)->hiToolbars->test_aaa"  to "get(swindow(num_wid)->hiToolbars test_aaa)"

in the command here, "->" can be changed to "get()", is this a function to change the "->" mark at the end of the command?

The get operator does pretty much the same as -> but it evaluates it's second argument, so it can be a variable or an expression. The -> treats whatever is on it's right-hand side as literal and unless there is a property with the exact given name it will return nil.

Petar's description is right (of course). A bit more background - when you use:

a->b

this is the same as the function call getq(a b) - and this is a syntax form in SKILL which doesn't follow the usual rules for functions (where arguments are all evaluated up front before the function is called). Because of this, the getq function evaluates its first argument (the variable containing the structure or disembodied property list), and takes the second argument literally as a symbol. No evaluation of the second argument is performed.

The get() function is a traditional function which evaluates all its arguments up front. So the equivalent of a->b would be:

get(a 'b)

(i.e. you need to quote the second argument yourself). This means that you can do:

slot='b
get(a slot)

There's no way of doing that with the -> operator, because it's just the same as using the getq() call.

For completeness, if you do:

a->b="hello"

then this is equivalent to putpropq(a "hello" b). The third argument is treated literally. If you want the fully-evaluated form, you use putprop() instead:

putprop(a "hello" 'b)

Hope that helps!

Andrew

Thank you for your help !
now, I understand get operation. Thank you again !

Thank you for your detailed explanation !!