Re: ATL/COM: Interface as property of another interface

Hello Roman, thnaks for the answer.

About the internal interface:

The problem creating the interface is that I need a function with a pointer
to a class (TJName*). When I do an import or include of the class file into
the interface (in the IDL file), then I receive n compile errors from MIDL.

interface IInterName : IUnknown
{
    STDMETHOD(SetForNode)(TJName* name);
    STDMETHOD(SetToNull)();
}

I found some MACROS to create an interface outside the IDL file, for
example, in the Header file of the COM-Class that should implement the
interface. My interface is now like this:

static const IID IID_INewName = { 0xa1e5b58f, 0xf15d, 0x49ad, { 0xb5, 0xaa,
0xc6, 0xa0, 0x29, 0x56, 0xac, 0x37 } };
#undef INTERFACE
#define INTERFACE INewName
interface DECLSPEC_UUID("00A58F61-D52E-43f8-A083-35A7AF5C1757") INewName :
public IUnknown
{
 BEGIN_INTERFACE
    STDMETHOD(QueryInterface)(THIS_ REFIID riid, LPVOID FAR* ppvObj) PURE;
    STDMETHOD_(ULONG, AddRef)(THIS) PURE;
    STDMETHOD_(ULONG, Release)(THIS) PURE;
    STDMETHOD(SetForNode)(THIS_ TJName* name) PURE;
    STDMETHOD(SetToNull)(THIS) PURE;
 END_INTERFACE
};

At least, it compiles.

About the implementation of the interface:

I could find how to implement the new created interface in a COM-Class
already generated with the wizard. I did it and overrode the two methods of
the new created interface (SetToNull and SetforNode) and in the
FinalConstructor of the class I do all what I described in my last post. It
compiles without errors or warnings, but when I try to get the new interface
pointer with a QueryInterface, it fails with then error: E_NOINTERFACE.

class ATL_NO_VTABLE CPCJName :
 public CComObjectRootEx<CComSingleThreadModel>,
 public CComCoClass<CPCJName, &CLSID_PCJName>,
 public IDispatchImpl<IPCJName, &IID_IPCJName, &LIBID_PCJ, /*wMajor =*/ 1,
/*wMinor =*/ 0>,
public INewName
{
public:
 CPCJName() : m_objName()
 {
 }

DECLARE_REGISTRY_RESOURCEID(IDR_PCJNAME)

BEGIN_COM_MAP(CPCJName)
 COM_INTERFACE_ENTRY(IPCJName)
 COM_INTERFACE_ENTRY(IDispatch)
 COM_INTERFACE_ENTRY(INewName)
END_COM_MAP()

 DECLARE_PROTECT_FINAL_CONSTRUCT()

 HRESULT FinalConstruct()
 {
  SetForNode(NULL);
  return S_OK;
 }

 void FinalRelease()
 {
 }
public:
STDMETHOD(SetForNode)(THIS_ TJName* name);
STDMETHOD(SetToNull)(THIS);

//---------------------------------------------------------------------------

The FinalConstructor of the Node Class is like this now:

 HRESULT FinalConstruct()
 {
  HRESULT hR;

  hR = CoCreateInstance(CLSID_PCJName,NULL, CLSCTX_INPROC_SERVER,
IID_IPCJName,(void**)&m_objName);

  if(SUCCEEDED(hR))
  {
        INewName *temp;

        // Hier will fail with E_NONINTERFACE
        //
        hR = m_objName->QueryInterface(IID_INewName,(void**)&temp);
        if(SUCCEEDED(hR))
       {
          temp->SetForNode(&m_objNode.Name);
          return S_OK;
       }
       m_objName->Release();
  }
  return hR;
 }

 void FinalRelease()
 {
    HRESULT hR;
    INewName *temp;

    hR = m_objName->QueryInterface(IID_INewName,(void**)&temp);
    if(SUCCEEDED(hR))
    {
        temp->SetToNull();
        temp->Release();
    }
    m_objName->Release();
 }
//----------------------------------------------------

any Idea why it does not works?

"Roman Ryl..." <ryltsov@gmail.com> schrieb im Newsbeitrag
news:60558fcb-3703-4b1e-8075-bbd8cd2ea3ea@40g2000prx.googlegroups.com...