.MFileIO.getReferenceFileByNode - // Error: (kInvalidParameter): Invalid parameter

[Nicolas Chaverou]

Hey there,

Was trying to fetch information about the file a node has been referenced from but I can't get OpenMaya.MFileIO.getReferenceFileByNode to work properly.

I'm running the following piece of code:

import maya.OpenMaya

selectionList = maya.OpenMaya.MSelectionList()
selectionList.add( 'types_ToReference:pSphere1' )
node = maya.OpenMaya.MObject()
selectionList.getDependNode( 0, node )

file = maya.OpenMaya.MFileIO.getReferenceFileByNode( node )

# RuntimeError: (kInvalidParameter): Object does not exist //

Anything I missed?

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[Nicolas Chaverou]

Oops sorry, the error I'm getting is:

// Error: (kInvalidParameter): Invalid parameter

---

 
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[Justin Israel]

On Thu, Feb 15, 2018 at 11:36 PM Nicolas Chaverou <nicolas....@golaem.com> wrote:

Oops sorry, the error I'm getting is:

// Error: (kInvalidParameter): Invalid parameter

Seems like you are using it the way the API describes.

Is it possible to use cmds.referenceQuery(dagPath, filename=True)  ?

 

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[Nicolas Chaverou]

Thing is I need this code to work within the C++ API

As I couldn't make it work, I took a look at the Python side but it returns the same error

I thought that if I was able to make it work in Python, It'll help me figure out what's wrong on the C++ side :/

Thanks for looking at it anyway

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[Marcus Ottosson]

I get that error when, unsurprisingly, the object does not exist.

Do you have a reproducible, including the creation of that sphere?

[Nicolas Chaverou]

Hey Marcus,

Which error is that ?

In my first email, I pasted the wrong error line.

The one I'm actually getting is

// Error: (kInvalidParameter): Invalid parameter

Regarding the scene : create a sphere poly, save it

Reference that scene using the Create Reference... menu in Maya

Run the code (change the namespace if required)

---

 
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On Fri, Feb 16, 2018 at 11:12 AM, Marcus Ottosson <konstr...@gmail.com> wrote:

I get that error when, unsurprisingly, the object does not exist.

Do you have a reproducible, including the creation of that sphere?

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[Nicolas Chaverou]

Hey,

Weirdly the following commands which take MObject don't work neither

maya.OpenMaya.MFileIO.loadReferenceByNode(node)

// Error: line 1: Please specify a reference node or referenced file to unload. //

maya.OpenMaya.MFileIO.unloadReferenceByNode(node)

// Error: line 1: Please specify a reference node or referenced file to unload. //

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On Fri, Feb 16, 2018 at 3:33 PM, Nicolas Chaverou <nicolas....@golaem.com> wrote:

Hey Marcus,

Which error is that ?

In my first email, I pasted the wrong error line.

The one I'm actually getting is
// Error: (kInvalidParameter): Invalid parameter

Regarding the scene : create a sphere poly, save it

Reference that scene using the Create Reference... menu in Maya

Run the code (change the namespace if required)

---

 
+33 (0)2 99 27 21 44
http://www.golaem.com

On Fri, Feb 16, 2018 at 11:12 AM, Marcus Ottosson <konstr...@gmail.com> wrote:

I get that error when, unsurprisingly, the object does not exist.

Do you have a reproducible, including the creation of that sphere?

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[Sivanny Selvakumar]

Most referencing commands/functions require you to pass in the reference node (i.e. node type is "reference"). It looks like you are trying to use a referenced node -- the sphere.

You can query the reference node for a referenced object with `referenceQuery -referenceNode ref:pSphere1`. This should give you something like sphereRN. You can then get the MObject for sphereRN, pass it to getReferenceFileByNode and it should work.

I don't think this particular referenceQuery functionality is exposed in C++. It really should be. It's annoying that MFnDependencyNode has isFromReferencedFile, but doesn't give you a way to query which reference it's a part of.

Sivanny

[Nicolas Chaverou]

Hey Sivanny,

You're correct indeed...

So no way, on the API side to easily fetch the reference file of a referenced node... Dammit...

I'll have to figure something else, it's annoying indeed.

Best,

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[Sivanny Selvakumar]

The only thing you can do is use MGlobal::executeCommand to run the referenceQuery command in C++.

I would log a defect with Autodesk about this, since it's such a big hole in the API.