How to convert class instance to IntPtr

[ramanujam kv]

I have two C# classes (Interop & Assembly)which is shown below

public class CTest
{
   public CTest()
   {
   }
 
   public void SimpleFunction()
   {
   }
}
 
public class CGetSimpleFunctionTest
{
   public CGetSimpleFunctionTest()
   {
   }
 
   public IntPtr GetSimpleFunctionClass()
   {
       CTest test = new CTest();
 
       IntPtr pTest = new IntPtr();
       GCHandle gch = GCHandle.Alloc(test, GCHandleType.Pinned);
   }
}
 

I have a unmanged c++ client and c++ client creates an instance of CGetSimpleFunctionTest through COM. it calls GetSimpleFunctionClass()to get the CTest object. Then it calls SimpleFunction() on CTest object.


Problem is when GetSimpleFunctionClass() is called, GCHandle.Alloc is throwing an exception "Object contains non-primitive or non-blittable data." . I don't have any data members in CTest class just one function SimpleFunction().


I searched entire net to solve the above problem, but i could not get any solution.

Please Please can anyone helpme to solve this problem

[Plater]

Have you tried working with Marshal.StructureToPtr()?

EDIT: Ok it produces the same message pretty much.
For Marshal.SizeOf() I see this:
"You can only use Marshal.SizeOf to get the size of a value type (struct) or
a class that has an explicit layout declaration (StructLayoutAttribute)"

I recomend using: [StructLayoutAttribute(LayoutKind.Sequential, Pack = 1)]
That will allow marshalling of your class, and pack=1 means it will allign the data bytes on single byte offsets (my default seems to be 4 bytes)