COM Object Clean Up
- by Reggie McCray
What is the difference between the two lines of code below:
CComPtr< IInterface > m_interface;
IInterface* m_interface;
I know that CComPtr help eliminate memory leaks, but I am getting inconsistent results. When declaring the pointer with CComPtr< IInterface > m_interface;
and using the interface in my C# code there are no errors, however using the Interface in VC++ I get an unhandled exception error, even if I comment out the instance creation of IInterface.
I am pretty sure the problem is in here somewhere:
STDMETHODIMP CSomeClass::get_IClass(IClass** var)
{
return m_class_var->QueryInterface(var);
}
STDMETHODIMP CSomeClass::putref_IClass(IClass* var)
{
m_class_var = var;
return S_OK;
}
When I declare the interface pointer with: IInterface* m_interface;
I get a RPC_E_SERVERFAULT error when testing the Interface in C# and have to explicitly call GC.Collect() to avoid the error being thrown after instantiation of a few objects. When testing the Interface in VC++ the error is consistent however when it occurs is different. If I comment out the instance creation of IInterface the code runs fine, however when I try to create an instance I get same error as before, just a vague unhandled exception error. What am I doing wrong here?
