Windows API Guide: Reference: Messages


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_DELETESTRING message to a combo box removes one of the items from its drop-down box.

Return Value

If successful, the message returns the number of items remaining in the combo box's drop-down box. If an error occured, the message returns CB_ERR.

Visual Basic-Specific Issues

None.

Parameters

wParam
The zero-based index of the string to delete from the combo box's drop-down box.
lParam
Not used -- set to zero.

Constant Definitions

Const CB_DELETESTRING = &H144 Const CB_ERR = -1

Example

When the user clicks button Command1, remove the second item from combo box's Combo1 drop-down box. To run this example, place a combo box named Combo1 and a command button named Command1 on a form window.

' 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_DELETESTRING = &H144 Public Const CB_ERR = -1 ' *** Place the following code inside a form window. *** Private Sub Command1_Click() Dim result As Long  ' result of string deletion attempt ' Remove the second item from Combo1's drop-down list ' box, and display the result. result = SendMessage(Combo1.hWnd, CB_DELETESTRING, ByVal CLng(1), ByVal CLng(0)) If result = CB_ERR Then Debug.Print "Unable to delete the second string in Combo1's drop-down box." Else Debug.Print "There are"; result; "strings left in Combo1's drop-down box." End If End Sub

See Also

CB_ADDSTRING, CB_INSERTSTRING, CB_RESETCONTENT

Category

Combo Boxes

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Last Modified: September 24, 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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