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 CGetSimpleFunct ionTest through COM. it calls GetSimpleFuncti onClass()to get the CTest object. Then it calls SimpleFunction( ) on CTest object.


Problem is when GetSimpleFuncti onClass() 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.Structu reToPtr()?

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 (StructLayoutAt tribute)"

I recomend using: [StructLayoutAtt ribute(LayoutKi nd.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)