Getting command arguments for a custom command

[Russel Rehmund]

Hi there,

I'm trying to write a command plugin for maya, which I'd like to give a list of assets from the scene:

cmds.ls(selection=True)

I'd like to then accept this list into my command either as an argument or give it to a flag, but this is where my knowledge stops.  I'd like to be able to do one of the following:

(As an argument)

assets = cmds.ls(selection=True)

cmds.my_command(assets, some_flags=True)

(To a flag)

assets = cmds.ls(selection=True)

cmds.my_command(asset_flag=assets, some_flags=True)

My first attempt was trying to use a flag, but getting a list from a flag wasn't trivial, so I'm now trying to get it as an argument using:

arg_parser_data = om.MArgParser(self.syntax(), args)

assets = om.MSelectionList()

success = arg_parser_data.getObjects(assets)

However I keep getting an unhelpful "Internal Failure Error" from maya.  Any help or indications would be great!

Thanks,

Russ

[Justin Israel]

If you want to make it work like many of the existing Maya commands that take either objects as arguments, or falls back to the selection list, then you likely want to look at using MSyntax with an object list, and MArgDatabase:

http://help.autodesk.com/view/MAYAUL/2018/ENU/?guid=__cpp_ref_class_m_syntax_html

This would hand you the selection automatically. 

Thanks,

Russ

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[Russel Rehmund]

So to be clear, I should be using the parser and the database classes?  If I try the following, I still get an internal error:

arg_data = om.MArgDatabase(self.syntax(), args)

assets = om.MSelectionList()

success = arg_data.getObjects(assets)

When it comes to getting the values of specific flags, I've got the value with help from examples, doing this:

        if arg_data.isFlagSet(kShortCamName):

            # We use the '0' to index the flag's first and only parameter.

            cam_name = arg_data.flagArgumentString(kShortCamName, 0)

But when I try similarly to use arg_data.commandArgumentString(0), I get an error.  I've gone and done the follow syntax command also:

syntax = om.MSyntax()

syntax.setObjectType(om.MSyntax.kStringObjects, 1)

Is there no way for me to get the list of strings passed to my command?  This problem got me stumped.

On Saturday, 15 June 2019 20:18:51 UTC-4, Justin Israel wrote:

On Sun, Jun 16, 2019, 8:52 AM Russel Rehmund <russel...@gmail.com> wrote:

Hi there,

I'm trying to write a command plugin for maya, which I'd like to give a list of assets from the scene:

cmds.ls(selection=True)

I'd like to then accept this list into my command either as an argument or give it to a flag, but this is where my knowledge stops.  I'd like to be able to do one of the following:

(As an argument)

assets = cmds.ls(selection=True)

cmds.my_command(assets, some_flags=True)

(To a flag)

assets = cmds.ls(selection=True)

cmds.my_command(asset_flag=assets, some_flags=True)

My first attempt was trying to use a flag, but getting a list from a flag wasn't trivial, so I'm now trying to get it as an argument using:

arg_parser_data = om.MArgParser(self.syntax(), args)

assets = om.MSelectionList()

success = arg_parser_data.getObjects(assets)

However I keep getting an unhelpful "Internal Failure Error" from maya.  Any help or indications would be great!

If you want to make it work like many of the existing Maya commands that take either objects as arguments, or falls back to the selection list, then you likely want to look at using MSyntax with an object list, and MArgDatabase:

http://help.autodesk.com/view/MAYAUL/2018/ENU/?guid=__cpp_ref_class_m_syntax_html

This would hand you the selection automatically. 

Thanks,

Russ

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