Exposes a method for getting a thumbnail image.

IThumbnailProvider Members

GetThumbnail

Gets a thumbnail image and alpha type.

Remarks

The Shell calls IThumbnailProvider::GetThumbnail to obtain an image to use as a representation of the item.

An implementation of this interface for photo thumbnails is supplied in Microsoft Windows as CLSID_PhotoThumbnailProvider. Applications that use the supplied implementation must define a constant CLSID identifier using the GUID {C7657C4A-9F68-40fa-A4DF-96BC08EB3551}.

// {C7657C4A-9F68-40fa-A4DF-96BC08EB3551}
const CLSID CLSID_PhotoThumbnailProvider = {0xC7657C4A, 0x9F68, 0x40fa, {0xA4, 0xDF, 0x96, 0xBC, 0x08, 0xEB, 0x35, 0x51}} ;

The object that implements this interface must also implement one of the following interfaces.

• IInitializeWithStream. If present, the Shell calls IInitializeWithStream::Initialize with the stream of the item. Thumbnail extractors for file system items should implement this whenever possible.
• IInitializeWithItem. If present, the Shell calls IInitializeWithItem::Initialize with the IShellItem representation of the item.
• IInitializeWithFile. If present, the Shell calls IInitializeWithFile::Initialize with the path of the file.

If none of these interfaces is present, IThumbnailProvider is not called.

Interface Information

Inherits from	IUnknown
Header and IDL files	thumbcache.h, thumbcache.idl
Minimum operating systems	Windows Vista