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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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SetCapture
The SetCapture function sets the mouse capture to the specified window belonging to the
current thread. Once a window has captured the mouse, all mouse input is directed
to that window, regardless of whether the cursor is within the borders of that
window. Only one window at a time can capture the mouse.
If the mouse cursor is over a window created by another thread, the system
will direct mouse input to the specified window only if a mouse button is down.
HWND SetCapture(
HWND hWnd
| // handle of window to receive mouse capture
| );
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Parameters
hWnd
Identifies the window in the current thread that is to capture the mouse.
Return Values
If the function succeeds, the return value is the handle of the window that
had previously captured the mouse. If there is no such window, the return value
is NULL.
Remarks
Only the foreground window can capture the mouse. When a background window
attempts to do so, the window receives messages only for mouse events that occur
when the cursor hot spot is within the visible portion of the window. Also, even
if the foreground window has captured the mouse, the user can still click
another window, bringing it to the foreground.
When the window no longer requires all mouse input, the thread that created
the window should call the ReleaseCapture function to release the mouse.
This function cannot be used to capture mouse input meant for another process.
Windows 95: Calling this function causes the window that is losing the mouse capture to
receive a WM_CAPTURECHANGED message.
See Also
GetCapture, ReleaseCapture, WM_CAPTURECHANGED
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