IShellFolder::EnumObjects method

Enables a client to determine the contents of a folder by creating an item identifier enumeration object and returning its IEnumIDList interface. The methods supported by that interface can then be used to enumerate the folder's contents.

Syntax

HRESULT EnumObjects(
  HWND        hwnd,
  SHCONTF     grfFlags,
  IEnumIDList **ppenumIDList
);

Parameters

hwnd

Type: HWND

If user input is required to perform the enumeration, this window handle should be used by the enumeration object as the parent window to take user input. An example would be a dialog box to ask for a password or prompt the user to insert a CD or floppy disk. If hwndOwner is set to NULL, the enumerator should not post any messages, and if user input is required, it should silently fail.

grfFlags

Type: SHCONTF

Flags indicating which items to include in the enumeration. For a list of possible values, see the SHCONTF enumerated type.

ppenumIDList

Type: IEnumIDList**

The address that receives a pointer to the IEnumIDList interface of the enumeration object created by this method. If an error occurs or no suitable subobjects are found, ppenumIDList is set to NULL.

Return Value

Type: HRESULT

Returns S_OK if successful, or an error value otherwise. Some implementations may also return S_FALSE, indicating that there are no children matching the grfFlags that were passed in. If S_FALSE is returned, ppenumIDList is set to NULL.

Remarks

If the method returns S_OK, then ppenumIDList receives a pointer to an enumerator. In this case, the calling application must free the returned IEnumIDList object by calling its Release method.

If the method returns S_FALSE, then the folder contains no suitable subobjects and the pointer specified in ppenumIDList is set to NULL.

If the method fails, an error value is returned and the pointer specified in ppenumIDList is set to NULL.

If the folder contains no suitable subobjects, then the IShellFolder::EnumObjects method is permitted either to set *ppenumIDList to NULL and return S_FALSE, or to set *ppenumIDList to an enumerator that produces no objects and return S_OK. Calling applications must be prepared for both success cases.

Requirements

   
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header shobjidl_core.h (include Shobjidl.h)
DLL Shell32.dll (version 4.0 or later)

See Also

IShellFolder

IShellFolder2

SHGetDesktopFolder