prevextent.h

在vc环境下

#pragma once

#include "resource.h"       // main symbols

#include "ArcCommands.h"
#include "MapCommandBase.h"

/////////////////////////////////////////////////////////////////////////////
// CPrevExtent
class ATL_NO_VTABLE CPrevExtent : 
	public CComObjectRootEx<CComSingleThreadModel>,
	public CComCoClass<CPrevExtent, &CLSID_PrevExtent>,
	public CMapCommandBase
{
public:
	CPrevExtent() :
	  CMapCommandBase( IDB_PREVEXTENT, IDS_CAPTION_PREVEXTENT, IDS_CATEGORY_COMMANDS )
	  {
	  }

	  DECLARE_REGISTRY_RESOURCEID(IDR_PREVEXTENT)

	  DECLARE_PROTECT_FINAL_CONSTRUCT()

	  BEGIN_COM_MAP(CPrevExtent)
		  COM_INTERFACE_ENTRY(ICommand)
	  END_COM_MAP()

public:
	// ICommand
	STDMETHOD(OnClick)();
	STDMETHOD(get_Enabled)(VARIANT_BOOL * Enabled);

};

OBJECT_ENTRY_AUTO(__uuidof(PrevExtent), CPrevExtent)