シェルフォルダ(IShellFolder)の取得

    static IShellFolderPtr GetShellFolderFromIL(LPITEMIDLIST pidl)

    {

        HRESULT hr = S_OK;

        if (pidl == NULL)

        {

            return NULL;

        }

        IShellFolderPtr spShellFolderParent;

        hr = ::SHGetDesktopFolder(&spShellFolderParent);

        if (FAILED(hr))

        {

            return NULL;

        }

        LPITEMIDLIST pidlDesktop = NULL;

        hr = ::SHGetSpecialFolderLocation(NULL, CSIDL_DESKTOP, &pidlDesktop);

        if (FAILED(hr))

        {

            return NULL;

        }

        BOOL br = CILHelper::Emulate_ILIsEqual(pidl, pidlDesktop);

        if (br)

        {

            return spShellFolderParent;

        }

        IShellFolderPtr spShellFolder;

        LPITEMIDLIST pidlNext = pidl;

        while (pidlNext->mkid.cb)

        {

            LPITEMIDLIST pidlSub = CILHelper::Emulate_ILCloneFirst(pidlNext);

            spShellFolder = NULL;

            hr = spShellFolderParent->BindToObject(pidlSub, NULL, __uuidof(IShellFolder), (void**)&spShellFolder);

            if (FAILED(hr))

            {

                return NULL;

            }

            spShellFolderParent = spShellFolder;

            CILHelper::Emulate_ILFree(pidlSub);

            pidlNext = CILHelper::Emulate_ILGetNext(pidlNext);

        }

        return spShellFolder;

    }

    static IShellFolderPtr GetShellFolderFromCSIDL(int nFolder)

    {

        HRESULT hr = S_OK;

        LPITEMIDLIST pidl = NULL;

        hr = ::SHGetSpecialFolderLocation(NULL, nFolder, &pidl);

        if (FAILED(hr))

        {

            return NULL;

        }

        IShellFolderPtr spShellFolder = CShellFolderHelper::GetShellFolderFromIL(pidl);

        CILHelper::Emulate_ILFree(pidl);

        return spShellFolder;

    }

    static IShellFolderPtr GetShellFolderFromPath(LPCTSTR szFolderName)

    {

        LPITEMIDLIST pidl = CILHelper::Emulate_ILCreateFromPath(szFolderName);

        if (pidl == NULL)

        {

            return NULL;

        }

        IShellFolderPtr spShellFolder = CShellFolderHelper::GetShellFolderFromIL(pidl);

        CILHelper::Emulate_ILFree(pidl);

        return spShellFolder;

    }