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IExtractIcon
The IExtractIcon interface is used by the shell to retrieve icons for objects it displays.
The operating system provides default icons for file objects but you can
specify custom icons by making appropriate registry entries and, in some cases, by
using IExtractIcon.
When to Implement
You implement IExtractIcon to provide either instance-specific icons for objects in a particular class,
or icons for subfolders that extend the Explorer's name space. These
implementations are accomplished by writing handler code in an OLE in-process server COM
DLL.
In addition, if you implement IShellFolder, you will need to provide an implementation of IExtractIcon that callers can obtain by using IShellFolder::GetUIObjectOf.
Shell extensions based on IExtractIcon must be initialized by using IPersistFile::Load. You should also note that shell extensions do not work unless all
appropriate registry entries are made.
When to Use
In most cases, you don't call this interface directly. It is usually called by
the shell when an icon has been made available by a properly registered
handler. However, you can call IExtractIcon directly if you want to delegate the task of icon extracting to another
object.
Methods in Vtable Order
IUnknown Methods
| Description
| QueryInterface
| Returns pointers to supported interfaces.
| AddRef
| Increments reference count.
| Release
| Decrements reference count.
|
IExtractIcon Methods
| Description
| GetIconLocation
| Retrieves the icon location for an object.
| Extract
| Extracts an icon from the specified location.
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