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How to access the data of a treeStruct (created by hiCreateTree) ?

Rein

Hi,

     For example,  

                a = hiCreateTree('a)   

 

                b = hiCreateTreeItem(......)   

 

                hiTreeAppendItems(a list(b))

 

How to access data b from a?

I try to use a~>?? to view data of a. But it is display (activeUT hiFieldSym a).


Thanks

Rein

Parents
  • Andrew Beckett

    Laurent,

    Yes, you're right. It should be:

    items=hiGetTreeItems( abTreeExampleForm->shapeTree->choice)

    I had a slightly hacked version of this code in my work area, and for some reason I'd changed the field name to be treeField in my local version and I'd not noticed.

    For your second question, there's two reasons why it doesn't work. First, putpropq is not the same as an array access. It's equivalent (in fact identical to):

    treeField->hiContextMenu=abTreeExampleMenu

    The "q" at the end of putpropq means that the second argument is implicitly quoted - so that means the function is not a normal lambda function in that its arguments are not evaluated before the call - the function itself determines which arguments to evaluate, and which to take literally. It's equivalent (but not identical to):

    putprop(treeField abTreeExampleMenu 'hiContextMenu) ; notice the quote that is necessary if you use putprop rather than putpropq.

    You can use the -> operator (or putpropq) on hash tables, but you can't use the hash table (array access) syntax on forms, form fields, etc. So that's why the [] syntax wouldn't work. If it had have been possible, you'd have had to do:

    treeField['hiContextMenu]=abTreeExampleMenu

    but that won't work because [] is not supported on structures or fields etc.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Laurent,

    Yes, you're right. It should be:

    items=hiGetTreeItems( abTreeExampleForm->shapeTree->choice)

    I had a slightly hacked version of this code in my work area, and for some reason I'd changed the field name to be treeField in my local version and I'd not noticed.

    For your second question, there's two reasons why it doesn't work. First, putpropq is not the same as an array access. It's equivalent (in fact identical to):

    treeField->hiContextMenu=abTreeExampleMenu

    The "q" at the end of putpropq means that the second argument is implicitly quoted - so that means the function is not a normal lambda function in that its arguments are not evaluated before the call - the function itself determines which arguments to evaluate, and which to take literally. It's equivalent (but not identical to):

    putprop(treeField abTreeExampleMenu 'hiContextMenu) ; notice the quote that is necessary if you use putprop rather than putpropq.

    You can use the -> operator (or putpropq) on hash tables, but you can't use the hash table (array access) syntax on forms, form fields, etc. So that's why the [] syntax wouldn't work. If it had have been possible, you'd have had to do:

    treeField['hiContextMenu]=abTreeExampleMenu

    but that won't work because [] is not supported on structures or fields etc.

    Regards,

    Andrew.

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