ISetPage4ThumbnailProvider.md

ISetPage4ThumbnailProvider interface

Adding multipage support to IThumbnailProvider.

idl definition:

	[
	  odl,
	  uuid(D8D5F848-8223-42FC-BBCB-C40056B71A17),
	  helpstring("ISetPage4ThumbnailProvider if")
	]
	interface ISetPage4ThumbnailProvider : IThumbnailProvider {
		HRESULT _stdcall GetPageCount([out, retval] unsigned long* pcPages);
		HRESULT _stdcall SetActivePage([in] unsigned long iPage);
	};

Useful for:

• PDF
• TIF/TIFF

iPage of SetActivePage:

iPage	Command type invoked
0	Invoke (Default) command.
Positive page numbers	Invoke MP command.