mel shelf coding

[likage]

Apologize in advance that this is non-python related question but it is still related to maya though.. But I need some help in mel commands for this shelving of mine..

Say I have this shelf_funcs.mel that contains the setup or initialization of those shelf buttons..

One of its functions is as follows:

global proc shelfFuncs_paint()
{  
    shelfButton
        -enableCommandRepeat 1
        -enable 1
        -width 34
        -height 34
        -manage 1
        -visible 1
        -annotation "spPaint tool for SITE"
        -label "spPaint"
        -image1 "iconTest.png"
        -style "iconOnly"
        -stp "python"
        -command "import paintGUI;reload(paintGUI);paintGUI.paintGUIWin()"
        ;
}

Then I have another file - let's called it shelf_misc.mel that was called in Maya startup in which it then calls for shelf_funcs.mel

Pertaining to the above function, this is how it looks like in the shelf_misc.mel

global proc shelf_miscTools()
{  
    eval( "source shelf_funcs.mel" );
    ...
    ...
    shelfFuncs_paint();
    ...
    ...
}

So if this paintGUI script exists within the python directory of Maya, it will creates its own icon and be present in the shelf. Now my question is, how do I make it conditional in the shelf_misc.mel such that if the paintGUI.py does not in the directory, it should not create the icon?

Currently the icon is still present and unless if I click on it, an error will occurs stating '# ImportError: No module named paintGUI # '

[Justin Israel]

Could you return an int from your shelfFuncs_paint() to indicate success or failure? Then you could test importing the python module before creating the button. If you failure to import the module then return 0. Otherwise return 1.

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