IShellFolder::BindToObject method (shobjidl_core.h)

Retrieves a handler, typically the Shell folder object that implements IShellFolder for a particular item. Optional parameters that control the construction of the handler are passed in the bind context.

Syntax

HRESULT BindToObject(
  [in]  PCUIDLIST_RELATIVE pidl,
  [in]  IBindCtx           *pbc,
  [in]  REFIID             riid,
  [out] void               **ppv
);

Parameters

[in] pidl

Type: PCUIDLIST_RELATIVE

The address of an ITEMIDLIST structure (PIDL) that identifies the subfolder. This value can refer to an item at any level below the parent folder in the namespace hierarchy. The structure contains one or more SHITEMID structures, followed by a terminating NULL.

[in] pbc

Type: IBindCtx*

A pointer to an IBindCtx interface on a bind context object that can be used to pass parameters to the construction of the handler. If this parameter is not used, set it to NULL. Because support for this parameter is optional for folder object implementations, some folders may not support the use of bind contexts.

Information that can be provided in the bind context includes a BIND_OPTS structure that includes a grfMode member that indicates the access mode when binding to a stream handler. Other parameters can be set and discovered using IBindCtx::RegisterObjectParam and IBindCtx::GetObjectParam.

[in] riid

Type: REFIID

The identifier of the interface to return. This may be IID_IShellFolder, IID_IStream, or any other interface that identifies a particular handler.

[out] ppv

Type: void**

When this method returns, contains the address of a pointer to the requested interface. If an error occurs, a NULL pointer is returned at this address.

Return value

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

Applications use IShellFolder::BindToObject(..., IID_IShellFolder, ...) to obtain the Shell folder object for a subitem. Clients should pass the canonical interface IID that is used to identify a specific handler. For example, IID_IShellFolder identifies the folder handler and IID_IStream identifies the stream handler. Implementations can support binding to handlers using derived interfaces as well, such as IID_IShellFolder2. A Shell namespace extension can implement this function by creating the Shell folder object for the specified subitem and then calling QueryInterface to communicate with the object through its interface pointer.

Implementations of BindToObject can optimize any call to it by quickly failing for IID values that it does not support. For example, if the Shell folder object of the subitem does not support IRemoteComputer, the implementation should return E_NOINTERFACE immediately instead of needlessly creating the Shell folder object for the subitem and then finding that IRemoteComputer was not supported after all.

Requirements

See also

IPersistFolder

IPersistFolder2

IShellFolder

IShellFolder2

SHGetDesktopFolder