lb-gethorizontalextent.md

title	description	ms.assetid	keywords	topic_type	api_name	api_location	api_type	ms.topic	ms.date
LB_GETHORIZONTALEXTENT message (Winuser.h)	Gets the width, in pixels, that a list box can be scrolled horizontally (the scrollable width) if the list box has a horizontal scroll bar.	52461724-c06a-436a-ac95-94c5189ba37e	LB_GETHORIZONTALEXTENT message Windows Controls	apiref	LB_GETHORIZONTALEXTENT	Winuser.h	HeaderDef	reference	05/31/2018

LB_GETHORIZONTALEXTENT message

Gets the width, in pixels, that a list box can be scrolled horizontally (the scrollable width) if the list box has a horizontal scroll bar.

Parameters

wParam

Not used; must be zero.

lParam

Not used; must be zero.

Return value

The return value is the scrollable width, in pixels, of the list box.

Remarks

To respond to the LB_GETHORIZONTALEXTENT message, the list box must have been defined with the WS_HSCROLL style.

If the application does not set the horizontal extent of the list box (using LB_SETHORIZONTALEXTENT), the default horizontal extent is zero. Note that the list box does not update its horizontal extent dynamically.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Header	Winuser.h (include Windows.h)

See also

LB_SETHORIZONTALEXTENT