Create Thumbnail Extractor Objects for Your MFC Document Types

// ThumbExtract.idl : IDL source for ThumbExtract.dll
//

// This file will be processed by the MIDL tool to
// produce the type library (ThumbExtract.tlb) and marshalling code.
import "oaidl.idl";
import "ocidl.idl";
	[
		object,
		uuid(A1B8E7E1-2B2E-46D2-B60F-993028A58182),
		dual,
		helpstring("IFileThumbExtract Interface"),
		pointer_default(unique)
	]
	interface IFileThumbExtract : IDispatch
	{
		[id(1), helpstring("Set Path of the file")] HRESULT SetPath([in] BSTR Path);
		[id(2), helpstring("Set base directory")] HRESULT SetDir([in] BSTR Dir);
		[id(3), helpstring("Set filename")] HRESULT SetFile([in] BSTR File);
		[id(4), helpstring("Set Thumbnail Size")] HRESULT SetThumbnailSize([in] long Width,[in] long Height);
		[id(5), helpstring("Get Path")] HRESULT GetPath([out,retval] BSTR* Path);
		[id(6), helpstring("Get Dir")] HRESULT GetDir([out,retval] BSTR *Dir);
		[id(7), helpstring("Get File")] HRESULT GetFile([out,retval] BSTR* File);
		[id(8), helpstring("Extract Thumbnail")] 
		   HRESULT ExtractThumbnail([out,retval] long *phBitmap); // SAFEARRAY(BYTE) *ppBits);
		[id(9), helpstring("Erase Thumbnail"),hidden] HRESULT FreeThumbnail();
		[id(10), helpstring("Save To File (BMP or JPG)")] HRESULT SaveToFile([in] BSTR FilePath);
		[propget, id(11), helpstring("property Stride")] HRESULT Stride([out, retval] long *pVal);
		[propget, id(12), helpstring("property Version")] HRESULT Version([out, retval] BSTR *pVal);
		[propget, id(13), helpstring("property ThumbJpgData")] HRESULT ThumbJpgData([in,defaultvalue(75)] long JpegQuality, [out, retval] VARIANT *pVal);
	};

[
	uuid(7B85F162-5B0E-4F2A-A8AB-ACBF8F724190),
	version(1.0),
	helpstring("ThumbExtract 1.0 Type Library")
]
library THUMBEXTRACTLib
{
	importlib("stdole32.tlb");
	importlib("stdole2.tlb");

	[
		uuid(FC9850E3-9FC3-4C1F-8EE7-28F51EC014E1),
		helpstring("FileThumbExtract Class")
	]
	coclass FileThumbExtract
	{
		[default] interface IFileThumbExtract;
	};
};