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;
}

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