应该用GetFocus(),方法如下: GetFocus The GetFocus function retrieves the handle to the window that has the keyboard focus, if the window is attached to the calling thread's message queue. HWND GetFocus(VOID); Parameters This function has no parameters. Return Values The return value is the handle to the window with the keyboard focus. If the calling thread's message queue does not have an associated window with the keyboard focus, the return value is NULL. Res GetFocus returns the window with the keyboard focus for the current thread's message queue. If GetFocus returns NULL, another thread's queue may be attached to a window that has the keyboard focus. Use the GetForegroundWindow function to retrieve the handle to the window with which the user is currently working. You can associate your thread's message queue with the windows owned by another thread by using the AttachThreadInput function. Windows 98/Me and Windows NT 4.0 SP3 and later: To get the window with the keyboard focus on the foreground queue or the queue of another thread, use the GetGUIThreadInfo function.Example Code For an example, see Creating a Combo-box Toolbar. Requirements Windows NT/2000/XP: Included in Windows NT 3.1 and later. Windows 95/98/Me: Included in Windows 95 and later. Header: Declared in Winuser.h; include Windows.h. Library: Use User32.lib.
用来获取获得焦点的窗口的句柄
GetFocus
The GetFocus function retrieves the handle to the window that has the keyboard focus, if the window is attached to the calling thread's message queue. HWND GetFocus(VOID);
Parameters
This function has no parameters. Return Values
The return value is the handle to the window with the keyboard focus. If the calling thread's message queue does not have an associated window with the keyboard focus, the return value is NULL. Res
GetFocus returns the window with the keyboard focus for the current thread's message queue. If GetFocus returns NULL, another thread's queue may be attached to a window that has the keyboard focus. Use the GetForegroundWindow function to retrieve the handle to the window with which the user is currently working. You can associate your thread's message queue with the windows owned by another thread by using the AttachThreadInput function. Windows 98/Me and Windows NT 4.0 SP3 and later: To get the window with the keyboard focus on the foreground queue or the queue of another thread, use the GetGUIThreadInfo function.Example Code
For an example, see Creating a Combo-box Toolbar. Requirements
Windows NT/2000/XP: Included in Windows NT 3.1 and later.
Windows 95/98/Me: Included in Windows 95 and later.
Header: Declared in Winuser.h; include Windows.h.
Library: Use User32.lib.