ATL / WTL / STL

IDispatch, IPersistStreamInit, IOleControl, IOleObject, IOleInPlaceActiveObject, IViewObjectEx, IOleInPlaceObjectWindowless, IPersistStorage, ISpecifyPropertyPages, IQuickActivate, IDataObject, IProvideClassInfo2<br />

1. Create an ATL DLL project.
2. Add an 'ATL Control' class. Use some throwaway name for the control interface (because you *will* be throwing it away ), but make sure the class names are ones you're happy with.
3. Copy'n'paste your IDL interface into the new projects IDL file
4. In the Class View, right click the ATL Control class and select Add->Implement Interface... The interface you want to implement should be in the dialog that appears. Select it and click Finish. This should create bare method definitions.

It's a bug in ATL that affects WTL. The readme.html file included with
WTL7.5 (the latest WTL version, available at
http://sourceforge.net/projects/wtl) describes the workaround:

... Surround atlbase.h include declaration with following statements:

#define ATL ATLFIX
#include <atlapp.h>

#undef ATL

namespace ATL = ::ATLFIX;

It also describes the nature of the bug and the reason for the error
message.

#include <iostream>

class A
{
public:
   void M() { std::cout << "A::M - this = " << (int)this << "\n"; }
   virtual void X() { std::cout << "A::X - this = " << (int)this << "\n"; }
};

class B
{
public:
   void N() { std::cout << "B::N - this = " << (int)this << "\n"; }
   virtual void Y() { std::cout << "B::X - this = " << (int)this << "\n"; }
};

class C : public A, public B
{
public:
   void M() { std::cout << "C::M - this = " << (int)this << "\n"; }
   void N() { std::cout << "C::N - this = " << (int)this << "\n"; }
   virtual void X() { std::cout << "C::X - this = " << (int)this << "\n"; }
   virtual void Y() { std::cout << "C::Y - this = " << (int)this << "\n"; }
};

int main(int, char**)
{
   C c;
   
   // Call C::X through C
   c.X();
   // Call A::X through C
   c.A::X();
   // Call C::X through A*
   static_cast<A*>(&c)->X();
   // Call A::X through A*
   static_cast<A*>(&c)->A::X();
   
   // Call C::M through C
   c.M();
   // Call A::M through C
   c.A::M();
   // Call A::M through A*
   static_cast<A*>(&c)->M();
   // Call A::M through A*
   static_cast<A*>(&c)->A::M();

   // Call C::Y through C
   c.Y();
   // Call B::Y through C
   c.B::Y();
   // Call C::Y through B*
   static_cast<B*>(&c)->Y();
   // Call B::Y through B*
   static_cast<B*>(&c)->B::Y();
}

Demian Panello wrote:

I have added the WM_DRAWITEM function but the program never reach that function.