Variable number of widgets

Hi Ken,

Hopefully it is something simple (1) - in your code you have 'bButton[i] - the single quote ' prevents the evaluation of anything that follows, so the array index would not evaluate.  I'm not sure why you declare an array for this, it should not be needed?  Anyway, one method to achieve what you want is to create the symbol for storing the button structure by using concat to join the name base and the integer to form the symbol name, e.g. concat('bButton i) - the "i" is unquoted so that it will evaluate to 0, 1, 2 etc.

Another method (2) for creating unique symbol names that do not clash is to use gensym - this can be given a base name as in the above concat example: gensym('bButton) - so if you do not need to know or control the name of this symbol/variable, then this approach would work also.  Without more code context I don't know if this approach would suit your needs in this case.

I hope this answers your question and helps you get this working.

Lawrence.

Thanks Lawrence, that really does explain lots.  The reason I declared the array was to just be able to use arrays and declaring it fixed a different error.  I may be able to remove it.  All this code is currently just being hacked to see what I can do.  

I'll give the concat a try... I'd tried unsuccessfully to use sprintf to accomplish the same but I think I had other issues that were masking the problem.  Thanks for the feedback, I'll definitely give it a try! 

You could use sprintf(), but you'd need to convert it to a symbol afterwards. So something like stringToSymbol(sprintf(nil "button%d" i)) would do it - but concat('button i) is probably simpler!

Andrew.

 Good point!  I did use sprintf tho and it seemed to work... code isn't complete so I probably would have found an issue later.  Thanks for the heads up Andrew!

 SUCCESS!  After a few false starts, I was able to get the code to work.  Here's the new snippet: 

 procedure( createMenu()
  i = 0
  buttonList = '()
  while(i < iConnIndex
   nameVar = concat('bButton i)
   sprintf(buttonText "Use layer %s" iConn[i])
    nameVar = hiCreateBooleanButton(
    ?name nameVar
    ?buttonText buttonText
    ?callback "nil"
    ?value t
   );hCBB
  buttonList = cons(nameVar buttonList)
  i++
 );while

layerMenu = hiCreateAppForm(
  ?name          'myForm
  ?formTitle     "Test form"
  ?callback      nil
  ?fields        buttonList
  );hCAF

hiDisplayForm(layerMenu)
);

Many thanks for the help guys!