Windows API Guide: ArcTo Function


Platforms

  • Windows 95: Supported.
  • Windows 98: Supported.
  • Windows NT: Requires Windows NT 3.1 or later.
  • Windows 2000: Supported.
  • Windows CE: Requires Windows CE 1.0 or later.

Description & Usage

Sending the CB_SHOWDROPDOWN message to a combo box opens or closes its drop-down list box section. Naturally, this message only works if the combo box has a list that can be dropped down, instead of always or never displaying it.

Return Value

This message always returns a non-zero value.

Visual Basic-Specific Issues

None.

Parameters

wParam
If zero, closes the drop-down list of the combo box. If non-zero, opens the drop-down list of the combo box.
lParam
Not used -- set to 0.

Constant Definitions

Const CB_SHOWDROPDOWN = &H14F

Example

' This code is licensed according to the terms and conditions listed here. ' Declarations and such needed for the example: ' (Copy them to the (declarations) section of a module.) Public Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" (ByVal hWnd _ As Long, ByVal Msg As Long, wParam As Any, lParam As Any) As Long Public Const CB_SHOWDROPDOWN = &H14F ' Display the drop-down list box of combo box Combo1. Dim retval As Long  ' return value retval = SendMessage(Combo1.hWnd, CB_SHOWDROPDOWN, ByVal CLng(1), ByVal CLng(0))

See Also

CB_GETDROPPEDSTATE

Category

Combo Boxes

Back to the Message list.
Back to the Reference section.


Last Modified: April 16, 2000
This page is copyright © 2000 Paul Kuliniewicz. Copyright Information Revised October 29, 2000
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Windows API Guide
Windows API Guide - Reference - Volume 1: Version 3.0 For the MS-DOS and PC-DOS Operating Systems
ISBN: B001V0KQIY
EAN: N/A
Year: 1998
Pages: 610

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