Windows API Guide: InvertRgn 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 LB_DELETESTRING message to a list box removes one of the items in it.

Return Value

If successful, the message returns the number of items remaining in the list box. If an error occured, the message returns LB_ERR.

Visual Basic-Specific Issues

None.

Parameters

wParam: The zero-based index of the string to delete from the list box.
lParam: Not used -- set to zero.

Constant Definitions

Const LB_DELETESTRING = &H182 Const LB_ERR = -1

Example

When the user clicks button Command1, remove the second item from list box List1. To run this example, place a list box named List1 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 LB_DELETESTRING = &H182 Public Const LB_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 List1 and display the result. result = SendMessage(List1.hWnd, LB_DELETESTRING, ByVal CLng(1), ByVal CLng(0)) If result = LB_ERR Then Debug.Print "Unable to delete the second string in List1." Else Debug.Print "There are"; result; "strings left in List1." End If End Sub