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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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SetFocus
The SetFocus function sets the keyboard focus to the specified window. The window must be
associated with the calling thread's message queue.
HWND SetFocus(
HWND hWnd
| // handle of window to receive focus
| );
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Parameters
hWnd
Identifies the window that will receive the keyboard input. If this parameter
is NULL, keystrokes are ignored.
Return Values
If the function succeeds, the return value is the handle of the window that
previously had the keyboard focus. If the hWnd parameter is invalid or the window is not associated with the calling
thread's message queue, the return value is NULL.
Remarks
The SetFocus function sends a WM_KILLFOCUS message to the window that loses the keyboard
focus and a WM_SETFOCUS message to the window that receives the keyboard focus.
It also activates either the window that receives the focus or the parent of
the window that receives the focus.
If a window is active but does not have the focus, any key pressed will
produce the WM_SYSCHAR, WM_SYSKEYDOWN, or WM_SYSKEYUP message. If the VK_MENU key is
also pressed, the lParam parameter of the message will have bit 30 set. Otherwise, the messages
produced do not have this bit set.
By using the AttachThreadInput function, a thread can attach its input processing to another thread. This
allows a thread to call SetFocus to set the keyboard focus to a window associated with another thread's
message queue.
See Also
AttachThreadInput, GetFocus, WM_KILLFOCUS, WM_SETFOCUS, WM_SYSCHAR, WM_SYSKEYDOWN, WM_SYSKEYUP
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