FORMUNK.CPP

// --formunk.cpp-------------------------------------------------------------- 
// 
//   Implementation of the FRM IUnknown methods 
// 
// Copyright (C) Microsoft Corp. 1986-1996.  All Rights Reserved. 
// --------------------------------------------------------------------------- 
 
#include "stdafx.h" 
#include "tool.h" 
 
#include "formdata.h" 
#include "form.h" 
 
#ifdef _DEBUG 
#undef THIS_FILE 
static char BASED_CODE THIS_FILE[] = __FILE__; 
#endif 
 
#define new DEBUG_NEW 
 
//$--FRM::QueryInterface------------------------------------------------------ 
// 
//  Purpose: 
//      Returns a pointer to the specified interface. 
// 
//  Returns: 
//      HRESULT             Error status. 
// --------------------------------------------------------------------------- 
STDMETHODIMP 
FRM::QueryInterface( 
         REFIID riid,           // Interface wanted. 
         LPVOID FAR * ppvObj)   // Interface we return. 
{ 
    HRESULT hr = NOERROR; 
 
    ASSERT(m_cRef > 0); 
    if (IsEqualIID(riid, IID_IUnknown)) 
    { 
        AddRef(); 
        *ppvObj = (IMAPIForm *)this; 
    } 
    else if (IsEqualIID(riid, IID_IPersistMessage)) 
    { 
        AddRef(); 
        *ppvObj = (IPersistMessage *)this; 
    } 
    else if (IsEqualIID(riid, IID_IMAPIForm)) 
    { 
        AddRef(); 
        *ppvObj = (IMAPIForm *)this; 
    } 
    else 
    { 
        hr = ResultFromScode(E_NOINTERFACE); 
        *ppvObj = NULL; 
    } 
   
    return hr; 
} 
 
 
//$--FRM::AddRef-------------------------------------------------------------- 
// 
//  Purpose: 
//      Increments reference count on the sample extension. 
// 
//  Returns: 
//      ULONG               New value of reference count. 
// --------------------------------------------------------------------------- 
STDMETHODIMP_(ULONG) FRM::AddRef(void) 
{ 
    ASSERT(m_cRef > 0); 
    return ++m_cRef; 
} 
 
 
//$--FRM::Release------------------------------------------------------------- 
// 
//  Purpose: 
//      Decrements reference count on the sample extension.  If count is 
//      decremented to zero, the object is freed. 
// 
//  Returns: 
//      ULONG               New value of reference count. 
// --------------------------------------------------------------------------- 
STDMETHODIMP_(ULONG) FRM::Release(void) 
{ 
    ASSERT(m_cRef > 0); 
    if (!(--m_cRef)) 
    { 
        delete this; 
        return 0; 
    } 
    return m_cRef; 
}