[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index]

Reference for unit 'InterfaceBase' (#lcl)

TWidgetSet.GetWindowLong

Returns the attributes of a window.

Declaration

Source position: winapih.inc line 159

public function TWidgetSet.GetWindowLong(

Handle: HWND;

int: Integer

):PtrInt; virtual;

Arguments

`Handle`		The window handle.
`int`		Offset of the attribute.

Function result

The attribute.

Description

The following attributes are defined:

GWL_EXSTYLE: extended window style flags. See CreateWindowEx.
GWL_STYLE: window style flags.
GWL_WNDPROC: the window procedure (address or handle). See CallWindowProc.
GWL_HINSTANCE: handle of the application instance.
GWL_HWNDPARENT: handle of the parent window.
GWL_ID: the identifier of the window.
GWL_USERDATA: user data associated with the window.

The following attributes are also available when the window is a dialog box:

DWL_DLGPROC: the dialog box procedure (address or handle).
DWL_MSGRESULT: the return value of a message processed in the dialog box procedure.
DWL_USER: extra application information.

GWL_USERDATA and DWL_USER are the base offsets of user added attributes. The second user attribute can be access with an additional offset of 4, and so on.

Version 4.0

Generated 2025-05-03

Home