Hi,

I'm trying to access a COM object that only supports late binding.
This is how it works using VB6:

'Create an S_PLUS application object
Dim pApp As Object
Set pApp = CreateObject("SPLUS.Application");
Dim v1 As Variant, v2 As Variant
v1 = CVar("3D")
v2 = CVar("3D Line Plot")
bSuccess = pApp.ChooseGraphAndPlotType(v1, v2, hWnd)
'ChooseGraphAndPlotType() returns true if the user clicks the OK button
'If so, we print out the modified values of v1 and v2 which are the
'actual selections in the graph gallery.

This is what I have tried:

Type appType = Type.GetTypeFromProgID("SPLUS.Application");
object appObject = Activator.CreateInstance(appType);
object[] myArguments = new Object[3];
myArguments[0] = new StringBuilder("3D");
myArguments[1] = new StringBuilder("3D Line Plot");
myArguments[2] = this.Handle;
ParameterModifier pm = new ParameterModifier(3);
pm[0] = true;
pm[1] = true;
pm[2] = false;
ParameterModifier[] pmods = { pm };
object myBool = appType.InvokeMember("ChooseGraphAndPlotType",
                 BindingFlags.InvokeMethod, null, appObject, myArguments,
                 pmods, null, null);

When I run it I get
System.Runtime.InteropServices.COMException(0x800200005): Type mismatch.

I have tried using plain strings as myArguments with the same (Type
mismatch) result.

I would appreciate any help.

Jacek.