How To Initialize Vector Array Attribute

[darby]

Is it possible to create a vectorarray attribute for some a user-defined node? I write code as following in initialize():

CODE
MStatus stat;
MFnTypedAttribute tAttr;
MObject defaultObj;
MVectorArray vecArr;
MVector vec(0,0,0);
vecArr.append(vec);
MFnVectorArrayData vecArrFn;
defaultObj = vecArrFn.create(vecArr, &stat);
vectorArray = tAttr.create("VectorArray", "vear", MFn::kVectorArrayData, defaultObj, &stat);
stat = addAttribute( vectorArray );

but the output of "stat" is:
(kInvalidParameter): Object is incompatible with this method.
And I'm wondering whether or not all types following to "MFn::" can be used as attribute of node?

[mmeijer]

Hey darby

I'm using array attributes a lot now too.

Which call is giving you stat = kInvalidParameter ??
(one of the creates or the addAttribute?)
Have your arrays worked before, without the initialization?

You might want to try initializing your data in your
compute, say on the first compute.

In my initialize(), I'm declaring my arrays like this..

CODE
 MFnTypedAttribute   tAttr;
 MFnVectorArrayData vectorsData;
 vectorsObj = tAttr.create("vectArray", "vectors", MFnData::kVectorArray, vectorsData.create());
 tAttr.setHidden(true);
 stat = addAttribute(vectorsObj);

[darby]

hi, mmeijer, so strange, and now I change the code but it still doesn't work.

CODE
MFnTypedAttribute tAttr;
MFnVectorArrayData vecArrFn;
vectorArray = tAttr.create("VectorArray", "vear", MFn::kVectorArrayData, vecArrFn.create(), &stat1);
stat2 = tAttr.setHidden( true );
stat3 = addAttribute( vectorArray );

Then the output for MStatus is:
stat1: No error
stat2: (kFailure): Object does not exist
stat3: (kInvalidParameter): Object is incompatible with this method.

Since the "vectorArray" is created successfully, how come it does not exist?

[darby]

Ok I know what's wrong about my code: it should be MFnData::kVectorArray instead of MFn::kVectorArrayData.

[mmeijer]

You get the rest of this working?

[darby]

yes, I check it by creating some vectors in compute(), and then reading them out. Thanks for your help.