用CMfcShellTree和CMFCShellListCtrl实现资源管理器并过滤扩展名

资源管理器

CMfcShellTree和CMFCShellListCtrl是VS2008 SP1和VS2010内自带的控件，用这两个控件实现资源管理器只需几行代码。  

CMFCShellTreeCtrl m_tree;
CMyShellListCtrl m_list;
m_tree.Create(WS_CHILD | WS_VISIBLE | WS_BORDER | WS_HSCROLL | WS_TABSTOP | 0x4423 , CRect( 0 , 0 , 300 , 400 ), this , 1 );
m_list.Create(WS_CHILD | WS_VISIBLE | LVS_REPORT | WS_BORDER | WS_HSCROLL | WS_TABSTOP, CRect( 300 , 0 , 700 , 400 ), this , 2 );

 

 

VS2008的话，需要加入如下初始化代码 

BOOL CXXXApp::InitInstance()
{
……
InitShellManager();
……
}

  

过滤扩展名

两个控件过滤扩展名的方法类似，都是重载EnumObjects。以列表控件为例，CMyShellListCtrl派生自CMFCShellListCtrl，重载EnumObjects中的代码从基类中拷贝而来，修改2个地方。 

HRESULT CMyShellListCtrl::EnumObjects(LPSHELLFOLDER pParentFolder, LPITEMIDLIST pidlParent)
{
    ASSERT_VALID( this );
    ASSERT_VALID(afxShellManager);

    LPENUMIDLIST pEnum;
    HRESULT hRes = pParentFolder -> EnumObjects(NULL, m_nTypes, & pEnum);

    if (SUCCEEDED(hRes))
    {
        LPITEMIDLIST pidlTemp;
        DWORD dwFetched = 1 ;
        LPAFX_SHELLITEMINFO pItem;

        // enumerate the item's PIDLs
        while (pEnum -> Next( 1 , & pidlTemp, & dwFetched) == S_OK && dwFetched)
        {
            LVITEM lvItem;
            ZeroMemory( & lvItem, sizeof (lvItem));

            // fill in the TV_ITEM structure for this item
            lvItem.mask = LVIF_PARAM | LVIF_TEXT | LVIF_IMAGE | LVIF_STATE;

            // AddRef the parent folder so it's pointer stays valid
            pParentFolder -> AddRef();

            // put the private information in the lParam
            pItem = (LPAFX_SHELLITEMINFO)GlobalAlloc(GPTR, sizeof (AFX_SHELLITEMINFO));

            pItem -> pidlRel = pidlTemp;
            pItem -> pidlFQ = afxShellManager -> ConcatenateItem(pidlParent, pidlTemp);

            pItem -> pParentFolder = pParentFolder;
            lvItem.lParam = (LPARAM)pItem;

            lvItem.pszText = _T( "" );
            int n = GetItemCount();
            lvItem.iImage = OnGetItemIcon(n, pItem);

            // determine if the item is shared
            DWORD dwAttr = SFGAO_FOLDER | SFGAO_DISPLAYATTRMASK; // 在这里加入SFGAO_FOLDER

            pParentFolder -> GetAttributesOf( 1 , (LPCITEMIDLIST * ) & pidlTemp, & dwAttr);

            if (dwAttr & SFGAO_SHARE)
            {
                lvItem.mask |= LVIF_STATE;
                lvItem.stateMask |= LVIS_OVERLAYMASK;
                lvItem.state |= INDEXTOOVERLAYMASK( 1 ); // 1 is the index for the shared overlay image
            }

            if (dwAttr & SFGAO_GHOSTED)
            {
                lvItem.mask |= LVIF_STATE;
                lvItem.stateMask |= LVIS_CUT;
                lvItem.state |= LVIS_CUT;
            }

            　 // 这里加入代码

             if (dwAttr & SFGAO_FOLDER)
            {
            }
            else
            {


                SHFILEINFO sfi;
                TCHAR szPath [MAX_PATH];

                if (SHGetPathFromIDList(pItem-> pidlFQ, szPath))
                {
                    CFileStatus fs;
                    if (CFile::GetStatus(szPath, fs))
                    {
                        CString s = szPath;
                        int n = s.ReverseFind('.' );
                        if(n!=-1 )
                        {
                            s = s.Mid(n+1 );
                            s.MakeLower();
                            if(s == _T("jpg" ))
                                continue ;   }
                    }
                }


            }

            int iItem = InsertItem( & lvItem);

            if (iItem >= 0 )
            {
                // Set columns:
                const int nColumns = m_wndHeader.GetItemCount();
                for ( int iColumn = 0 ; iColumn < nColumns; iColumn ++ )
                {
                    CString s = OnGetItemText(iItem, iColumn, pItem);
                    SetItemText(iItem, iColumn,s );
                }
            }

            dwFetched = 0 ;
        }

        pEnum -> Release();
    }

    return hRes;
}