CCmdTarget类主要用来干什么的啊

[杂家老周]

[lbqsv]

用于所有能够消息映射的基类

[longaway]

CCmdTarget is the base class for the Microsoft Foundation Class Library message-map architecture. A message map routes commands or messages to the member functions you write to handle them. (A command is a message from a menu item, command button, or accelerator key.)

Key framework classes derived from CCmdTarget include CView, CWinApp, CDocument, CWnd, and CFrameWnd. If you intend for a new class to handle messages, derive the class from one of these CCmdTarget-derived classes. You will rarely derive a class from CCmdTarget directly.

For an overview of command targets and OnCmdMsg routing, seeCommand Targets,Command Routing, andMapping Messages in Visual C++ Programmer's Guide.

CCmdTarget includes member functions that handle the display of an hourglass cursor. Display the hourglass cursor when you expect a command to take a noticeable time interval to execute.

Dispatch maps, similar to message maps, are used to expose OLE automation IDispatch functionality. By exposing this interface, other applications (such as Visual Basic) can call into your application. For more information on the IDispatch interfaces, seeCreating the IDispatch Interface andDispatch Interface and API Functions in the Win32 SDK OLE Programmer's Reference.

#include <afxwin.h>