Requirements to access external parameter blocks?

[Anonymous]

Now that I am able to successfully create my object plugin from my utility plugin, I want to be able to control the object's parameters from the utility. utiltest.cpp contains an example in which a created cylinder's height and radius are accessed using the following:

Object *obj = (Object*)ip->CreateInstance(GEOMOBJECT_CLASS_ID, Class_ID(CYLINDER_CLASS_ID,0));
assert(obj);
IParamArray *iCylParams = obj->GetParamBlock();
assert(iCylParams); 

followed by a series of parameter statements in the format of:

int param = obj->GetParamBlockIndex(INDEX_INTEGER);
assert(param>=0);
iCylParams->SetValue(param, TimeValue(0), value);

to set the initial values.

Using this code as-is, I can make my own utility create a cylinder like the sample file. However, when I try to substitute my own plugin object, I get the error:

Assertion failed!

Program C:\...etc.\...c.pp Line: ###

Expression: params

For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts

(Press retry to debug the application - JIT must be enabled)

In which Line: ### refers to the line of the statement

assert(params)

My object base class includes the methods:

int GetParamBlockIndex(int id) { return id; }
IParamBlock2 *GetParamBlock(int i) { return pblock; }
IParamBlock2 *GetParamBlockByID (BlockID id) { return pblock->ID() == id ? pblock : NULL; }

and the source file contains the following:

enum { obj_params };
enum { obj_size };
static ParamBlockDesc2 obj_pblock (
obj_params, _T("ObjectParameters"), 0, &ObjDesc, P_AUTO_CONSTRUCT + P_AUTO_UI, PBLOCK_REF,
IDD_PANEL, IDS_PARAMS, 0, 0, NULL,
obj_size, _T("size"), TYPE_WORLD, P_ANIMATABLE, IDS_SIZE,
p_default, 0.0f, p_ms_default, 10.0f,
p_range, 0.0f, float(1.0E30),
p_ui, TYPE_SPINNER, EDITTYPE_UNIVERSE, IDC_SIZE_EDIT, IDC_SIZE_SPIN, SPIN_AUTOSCALE, p_accessor, &ObjDesc, end,
end
);

The object in question is of the HelperObject type, and its parameters work internally (it can be resized using a spinner).

What is most likely causing the Assertion Failed error? Is there something I need to add or change in my object source code to make it properly accessible by my utility? Or is there something that I need to add to my utility plugin to allow it to access my object?

[istan]

Could you please post your code? From what you have written, it's not clear to me what exactly you did. You are on the right way at least.

Istan