Use PainterInterface in DotNet

[Anonymous]

Hello,

Im trying to find a way to get the PainterInterface instance in mt DotNet plugin. Here's my code : 

public static IInterface_ID PAINTERINTERFACEV5_INTERFACE
{
  get
  {
    return Global.Interface_ID.Create(0x53b4520c, 0x29ff7ac9);
  }
}

public static IIPainterInterface_V5 PainterInterface
{
  get
  {
    IReferenceTarget painterRef = Ip.CreateInstance(PAINTERINTERFACE_SUPERCLASS_ID, PAINTERINTERFACE_CLASS_ID) as IReferenceTarget;
    if (painterRef != null)
    {
      IBaseInterface interf = painterRef.GetInterface(PAINTERINTERFACEV5_INTERFACE); // is non-null
      return (IIPainterInterface_V5)interf; // return null
    }
    return null;
  }
}

public static uint PAINTERINTERFACE_V5
{
  get
  {
     return 0x78ffe181;
  }
}

public static uint PAINTERCANVASINTERFACE_V5
{
  get
  {
    return 0x29ff7ac9;
  }
}

public static SClass_ID PAINTERINTERFACE_SUPERCLASS_ID
{
  get
  {
    return SClass_ID.RefTarget;
  }

}

public static IClass_ID PAINTERINTERFACE_CLASS_ID
{
  get
  {
    return Global.Class_ID.Create(0x2f2ef7e9, PAINTERINTERFACE_V5);
  }
}

It seems when I cast my BaseInterface to IIPainterInterface_V5, the object becomes null, maybe i missed something...

Thank you.

[denisT.MaxDoctor]

i'm a c++ programmer but my guess is it should be just:

IIPainterInterface_V5 interf = (IIPainterInterface_V5)painterRef.GetInterface(PAINTERINTERFACEV5_INTERFACE);

[Anonymous]

@Anonymous wrote:

i'm a c++ programmer but my guess is it should be just:

IIPainterInterface_V5 interf = (IIPainterInterface_V5)painterRef.GetInterface(PAINTERINTERFACEV5_INTERFACE);

---

I splitted the interf declaration in two lines to see it was the cast which causes the issue. when i wrote the same line as yours, the result is null too unfortunately.

[denisT.MaxDoctor]

Here is what I do and it works:

(for example)

BOOL BringUpPainterOptions()
{
	ReferenceTarget *painterRef = (ReferenceTarget*)GetCOREInterface()->CreateInstance(REF_TARGET_CLASS_ID, PAINTERINTERFACE_CLASS_ID);	
	if (painterRef) 
	{
		//set it to the correct verion
		IPainterInterface_V5* pPainter = (IPainterInterface_V5*)painterRef->GetInterface(PAINTERINTERFACE_V5);
		return pPainter->BringUpOptions();
	}
	return FALSE;
}

according to the documentation

class IPainterInterface_V5: public MaxHeapOperators
	{

this interface doesn't derive from BaseInterface, so the casting to it doesn't make sense

[Anonymous · Accepted solution]

---

@Anonymous wrote:

Here is what I do and it works:

(for example)

BOOL BringUpPainterOptions()
{
	ReferenceTarget *painterRef = (ReferenceTarget*)GetCOREInterface()->CreateInstance(REF_TARGET_CLASS_ID, PAINTERINTERFACE_CLASS_ID);	
	if (painterRef) 
	{
		//set it to the correct verion
		IPainterInterface_V5* pPainter = (IPainterInterface_V5*)painterRef->GetInterface(PAINTERINTERFACE_V5);
		return pPainter->BringUpOptions();
	}
	return FALSE;
}

according to the documentation

class IPainterInterface_V5: public MaxHeapOperators
	{

this interface doesn't derive from BaseInterface, so the casting to it doesn't make sense

---

Indeed there are two differents methods for GetInterface from IAnimatable, one returns an IBaseInterface, the other an object (same as "void *").  The last one needs an InterfaceID enumerator as parameter, but here is the list of enumerators given by 3dsMax : 

public enum InterfaceID
    {
        Control = 4112,
        Ikcontrol = 4128,
        Ikchaincontrol = 4144,
        Wirecontrol = 4160,
        Scriptcontrol = 4176,
        Master = 4192,
        Easelist = 4208,
        Multlist = 4224,
        Baseobject = 4240,
        Wsmobject = 4256,
        Derivedobject = 4272,
        Object = 4288,
        Particleobj = 4304,
        Lightobj = 4320,
        Simpleparticleobj = 4336,
        Keycontrol = 4352,
        Keycontrol2 = 4368,
        Setkeycontrol = 4384,
        SystemXref = 4400,
        Textobject = 4416,
        Wavesound = 4432,
        Newpartpod = 4464,
        Newpartsource = 4480,
        Newpartoperator = 4496,
        Newparttest = 4512,
        Meshselect = 4528,
        Meshselectdata = 4544,
        Maxscriptplugin = 4560,
        Meshdeltauser = 4576,
        Meshdeltauserdata = 4592,
        Splineselect = 4608,
        Splineselectdata = 4624,
        Splineops = 4640,
        Patchselect = 4656,
        Patchselectdata = 4672,
        Patchops = 4688,
        Submap = 4704,
        Mitranslator = 4720,
        Mentalray = 4736,
        Newmtlinterface = 4752,
        Component = 4768,
        Refarray = 4784,
        Linktmctrl = 4800,
        Subtargetctrl = 4816,
        Reagent = 4832,
        Geomimp = 4848,
        Aggregation = 4864,
        Valence = 4880,
        Guest = 4896,
        Host = 4912,
        Sceneobject = 4928,
        Multitangent = 4944,
        Softselect = 4960,
        Unreplaceablectl = 4976,
        Eulerctrl = 4992,
        Locked = 5008,
        LockedClient = 5024,
        ObjectsuperclassNotObjectclass = 5040,
        Compositesubmtlapi = 5056,
        Mtlidset = 5072,
        Userinterface = 65535
    }

In C++ we use PAINTERINTERFACE_V5 (0x78ffe181), so i also tried to cast this unsigned integer as InterfaceID...

The object returned is an NativeObject instance (from unmanaged memory) and it can't be cast directly too, so i used Marshal module to get the interface from the native object.

IReferenceTarget painterRef = (IReferenceTarget)Ip.CreateInstance(PAINTERINTERFACE_SUPERCLASS_ID, PAINTERINTERFACE_CLASS_ID);
if (painterRef != null)
{
  InterfaceID PainterInterfaceID = (InterfaceID)PAINTERINTERFACE_V5;
  Autodesk.Max.Wrappers.NativeObject obj = painterRef.GetInterface(PainterInterfaceID) as Autodesk.Max.Wrappers.NativeObject;
  IIPainterInterface_V5 pi = Global.IPainterInterface_V5.Marshal(obj.NativePointer);
  return pi;
}

It seems to work this way,

thank you !