Displaying an Item's Context Menu

The ENUMDESK sample supports context menus for items in the tree view and list view controls. Figure 14-4 shows the context menu displayed when I right-click the Nancycl2 [C:] folder.

Figure 14-4.

The context menu for the Nancycl2 [C:] folder in the ENUMDESK sample.

When an application determines that the user has right-clicked a specific tree view or list view item, the application calls a helper function to display the item's context menu. The helper function is passed the handle to the parent window, a pointer to the folder, a pointer to the item ID list, and the location where the context menu should be displayed.

BOOL CMfcenumView::DoTheMenuThing (

HWND hwnd, LPSHELLFOLDER lpsfParent, LPITEMIDLIST lpi, LPPOINT
lppt)

{

LPCONTEXTMENU lpcm;

HRESULT hr;

char szTemp [64];

CMINVOKECOMMANDINFO cmi;

DWORD dwAttribs = 0;

int idCmd;

HMENU hMenu;

BOOL bSuccess = TRUE;



hr = lpsfParent->GetUIObjectOf (

hwnd,

1, // get attributes for this many objects 

(const struct _ITEMIDLIST **)&lpi,

IID_IContextMenu,

0,

(LPVOID *)&lpcm);



if (SUCCEEDED (hr)) 

{

hMenu = CreatePopupMenu ();



if (hMenu)

{

// Get the context menu for the item.

hr = lpcm->QueryContextMenu (hMenu, 0, 1, 0x7fff,
CMF_EXPLORE);

if (SUCCEEDED (hr))

{

idCmd = TrackPopupMenu (

hMenu, TPM_LEFTALIGN | TPM_RETURNCMD | TPM_RIGHTBUTTON, 

lppt->x, lppt->y, 0, hwnd, NULL);



if (idCmd)

{

// Execute the command that was selected.

cmi.cbSize = sizeof (CMINVOKECOMMANDINFO);

cmi.fMask = 0;

cmi.hwnd = hwnd;

cmi.lpVerb = MAKEINTRESOURCE (idCmd - 1);

cmi.lpParameters = NULL;

cmi.lpDirectory = NULL;

cmi.nShow = SW_SHOWNORMAL;

cmi.dwHotKey = 0;

cmi.hIcon = NULL;



hr = lpcm->InvokeCommand (&cmi);

if (! SUCCEEDED (hr)) 

{

wsprintf (szTemp, "InvokeCommand failed. hr = %lx",
hr);

AfxMessageBox (szTemp);

}

}

}



else

bSuccess = FALSE;



DestroyMenu (hMenu);

}



else

bSuccess = FALSE;



lpcm->Release ();

} 



else

{

wsprintf (szTemp, "GetUIObjectOf failed! hr = %lx",
hr);

AfxMessageBox (szTemp);

bSuccess = FALSE;

}



return bSuccess;

}

With this code in place, the user can right-click an item, view the item's context menu, and choose a command from the context menu.