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LockWindowUpdate.md

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Function name : LockWindowUpdate

Group: Painting and Drawing - Library: user32

The LockWindowUpdate function disables or enables drawing in the specified window. Only one window can be locked at a time.

Code examples:

Disabling drawing in the VFP form
How to position the GETPRINTER() dialog

Declaration:

BOOL LockWindowUpdate(
  HWND hWndLock   // handle to window
);

FoxPro declaration:

DECLARE INTEGER LockWindowUpdate IN user32;
	INTEGER hWndLock

Parameters:

hWndLock [in] Specifies the window in which drawing will be disabled. If this parameter is NULL, drawing in the locked window is enabled.

Return value:

If the function succeeds, the return value is nonzero. If the function fails, the return value is zero, indicating that an error occurred or another window was already locked.