def convertIconToPNG(app_name, destination_path, desired_size):
    app_path = os.path.join('/Applications', app_name + '.app')
    if not os.path.exists(app_path):
        return False
    try:
        info = FoundationPlist.readPlist(
            os.path.join(app_path, 'Contents/Info.plist'))
    except FoundationPlist.FoundationPlistException:
        info = {}
    try:
        try:
            icon_filename = info.get('CFBundleIconFile', app_name)
        except AttributeError:
            icon_filename = app_name
        icon_path = os.path.join(app_path, 'Contents/Resources', icon_filename)
        if not os.path.splitext(icon_path)[1]:
            # no file extension, so add '.icns'
            icon_path += u'.icns'
        if os.path.exists(icon_path):
            image_data = NSData.dataWithContentsOfFile_(icon_path)
            bitmap_reps = NSBitmapImageRep.imageRepsWithData_(image_data)
            chosen_rep = None
            for bitmap_rep in bitmap_reps:
                if not chosen_rep:
                    chosen_rep = bitmap_rep
                elif (bitmap_rep.pixelsHigh() >= desired_size
                      and bitmap_rep.pixelsHigh() < chosen_rep.pixelsHigh()):
                    chosen_rep = bitmap_rep
            if chosen_rep:
                png_data = chosen_rep.representationUsingType_properties_(
                    NSPNGFileType, None)
                png_data.writeToFile_atomically_(destination_path, False)
                return True
    except Exception:
        return False

    return False
Converts an application icns file to a png file, choosing the
dataset/ETHPy150Open munki/munki/code/apps/Managed Software Center/Managed Software Center/MunkiItems.py/convertIconToPNG