windows-nt/Source/XPSP1/NT/admin/activec/samples/sdksamples/menubtn/about.cpp

//==============================================================;
//
//  This source code is only intended as a supplement to existing Microsoft documentation. 
//
// 
//
//
//  THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
//  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
//  IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
//  PURPOSE.
//
//  Copyright (C) 1999 Microsoft Corporation.  All Rights Reserved.
//
//
//
//==============================================================;

#include "About.h"
#include "resource.h"
#include "globals.h"
#include <crtdbg.h>

CSnapinAbout::CSnapinAbout()
: m_cref(0)
{
    OBJECT_CREATED
        
        m_hSmallImage = (HBITMAP)LoadImage(g_hinst, MAKEINTRESOURCE(IDB_SMBMP), IMAGE_BITMAP, 16, 16, LR_LOADTRANSPARENT);
    m_hLargeImage = (HBITMAP)LoadImage(g_hinst, MAKEINTRESOURCE(IDB_LGBMP), IMAGE_BITMAP, 32, 32, LR_LOADTRANSPARENT);
    
    m_hSmallImageOpen = (HBITMAP)LoadImage(g_hinst, MAKEINTRESOURCE(IDB_SMOPEN), IMAGE_BITMAP, 16, 16, LR_LOADTRANSPARENT);
    
    m_hAppIcon = LoadIcon(g_hinst, MAKEINTRESOURCE(IDI_ICON1));
}

CSnapinAbout::~CSnapinAbout()
{
    if (m_hSmallImage != NULL)
        FreeResource(m_hSmallImage);
    
    if (m_hLargeImage != NULL)
        FreeResource(m_hLargeImage);
    
    if (m_hSmallImageOpen != NULL)
        FreeResource(m_hSmallImageOpen);
    
    if (m_hAppIcon != NULL)
        FreeResource(m_hAppIcon);
    
    m_hSmallImage = NULL;
    m_hLargeImage = NULL;
    m_hSmallImageOpen = NULL;
    m_hAppIcon = NULL;
    
    OBJECT_DESTROYED
}

///////////////////////
// IUnknown implementation
///////////////////////

STDMETHODIMP CSnapinAbout::QueryInterface(REFIID riid, LPVOID *ppv)
{
    if (!ppv)
        return E_FAIL;
    
    *ppv = NULL;
    
    if (IsEqualIID(riid, IID_IUnknown))
        *ppv = static_cast<ISnapinAbout *>(this);
    else if (IsEqualIID(riid, IID_ISnapinAbout))
        *ppv = static_cast<ISnapinAbout *>(this);
    
    if (*ppv)
    {
        reinterpret_cast<IUnknown *>(*ppv)->AddRef();
        return S_OK;
    }
    
    return E_NOINTERFACE;
}

STDMETHODIMP_(ULONG) CSnapinAbout::AddRef()
{
    return InterlockedIncrement((LONG *)&m_cref);
}

STDMETHODIMP_(ULONG) CSnapinAbout::Release()
{
    if (InterlockedDecrement((LONG *)&m_cref) == 0)
    {
        // we need to decrement our object count in the DLL
        delete this;
        return 0;
    }
    return m_cref;
    
}

///////////////////////////////
// Interface ISnapinAbout
///////////////////////////////
STDMETHODIMP CSnapinAbout::GetSnapinDescription( 
                                                /* [out] */ LPOLESTR *lpDescription)
{
    _TCHAR szDesc[MAX_PATH];
    
    LoadString(g_hinst, IDS_SNAPINDESC, szDesc, sizeof(szDesc));
    
    return AllocOleStr(lpDescription, szDesc);
}


STDMETHODIMP CSnapinAbout::GetProvider( 
                                       /* [out] */ LPOLESTR *lpName)
{
    return AllocOleStr(lpName, _T("Copyright <20> 1998 Microsoft Corporation"));;
}


STDMETHODIMP CSnapinAbout::GetSnapinVersion( 
                                            /* [out] */ LPOLESTR *lpVersion)
{
    return AllocOleStr(lpVersion, _T("1.0"));;
}


STDMETHODIMP CSnapinAbout::GetSnapinImage( 
                                          /* [out] */ HICON *hAppIcon)
{
    *hAppIcon = m_hAppIcon;
    
    if (*hAppIcon == NULL)
        return E_FAIL;
    else
        return S_OK;
}


STDMETHODIMP CSnapinAbout::GetStaticFolderImage( 
                                                /* [out] */ HBITMAP *hSmallImage,
                                                /* [out] */ HBITMAP *hSmallImageOpen,
                                                /* [out] */ HBITMAP *hLargeImage,
                                                /* [out] */ COLORREF *cMask)
{
    *hSmallImage = m_hSmallImage;
    *hLargeImage = m_hLargeImage;
    
    *hSmallImageOpen = m_hSmallImageOpen;
    
    *cMask = RGB(0, 128, 128);
    
    if (*hSmallImage == NULL || *hLargeImage == NULL || *hSmallImageOpen == NULL)
        return E_FAIL;
    else
        return S_OK;
}

// this allocates a chunk of memory using CoTaskMemAlloc and copies our chars into it
HRESULT CSnapinAbout::AllocOleStr(LPOLESTR *lpDest, _TCHAR *szBuffer)
{
	MAKE_WIDEPTR_FROMTSTR_ALLOC(wszStr, szBuffer);
	*lpDest = wszStr;

    return S_OK;
}