SetWindowLongW(3w)
NAME
SetWindowLongW (USER32.@)
SYNOPSIS
LONG SetWindowLongW ( HWND hwnd, INT offset, LONG newval )
PARAMS
hwnd [In] window to alter.
offset [In] offset,in bytes,of location to alter.
[In] new value of location.
DESCRIPTION
SetWindowLongW (USER32.@) Set window attribute.
SetWindowLong() alters one of a window's attributes or sets a 32-bit
(long) value in a window's extra memory.
The _hwnd_ parameter specifies the window. is the handle to a window
that has extra memory. The _newval_ parameter contains the new
attribute or extra memory value. If positive, the _offset_ parameter is
the byte-addressed location in the window's extra memory to set. If
negative, _offset_ specifies the window attribute to set, and should be
one of the following values:
GWL_EXSTYLE The window's extended window style.
GWL_STYLE The window's window style.
GWLP_WNDPROC Pointer to the window's window procedure.
GWLP_HINSTANCE The window's pplication instance handle.
GWLP_ID The window's identifier.
GWLP_USERDATA The window's user-specified data.
If the window is a dialog box, the _offset_ parameter can be one of the
following values:
DWLP_DLGPROC The address of the window's dialog box procedure.
DWLP_MSGRESULT The return value of a message that the dialog box procedure processed.
DWLP_USER Application specific information.
RETURNS
If successful, returns the previous value located at _offset_. Otherwise, returns 0.
NOTES
Extra memory for a window class is specified by a nonzero cbWndExtra
parameter of the WNDCLASS structure passed to RegisterClass(3w) at the
time of class creation.
Using GWL_WNDPROC to set a new window procedure effectively creates a
window subclass. Use CallWindowProc(3w) in the new Windows(tm) procedure to pass messages to the superclass's window procedure.
The user data is reserved for use by the application which created the
window.
Do not use GWL_STYLE to change the window's WS_DISABLED style; instead,
call the EnableWindow(3w) function to change the window's disabled
state.
Do not use GWL_HWNDPARENT to reset the window's parent, use SetParent()
instead.
Win95: When offset is GWL_STYLE and the calling app's ver is 4.0, it
sends WM_STYLECHANGING before changing the settings and WM_STYLECHANGED
afterwards. App ver 4.0 can't use SetWindowLong to change WS_EX_TOPMOST.
IMPLEMENTATION
Defined in "winuser.h".
Implemented in "build/buildd-wine-unstable_1.1.32-1+b1-amd64-KnxYu0/wine-unstable-1.1.32/build32/dlls/user32/win.c".
- Debug channel "win".