C# Signature:
[DllImport("user32.dll")]
static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);
User-Defined Types:
None.
VB.NET Signature:
Public Declare Function EnumWindows Lib "user32" ( _
ByVal lpEnumFunc As CallBack, _
ByVal lParam As IntPtr) As Boolean
User-Defined Types:
Public Delegate Function CallBack( _
ByVal hwnd As IntPtr, _
ByVal lParam As IntPtr) As Boolean
Tips & Tricks:
Please add some!
C# SAMPLE CODE
public delegate bool CallBackPtr(int hwnd, int lParam);
public class EnumReport
{
[DllImport("user32.dll")]
public static extern int EnumWindows(CallBackPtr callPtr, int lPar);
public static bool Report(int hwnd, int lParam)
{
Console.Write("Window handle is "+hwnd);
return true;
}
}
void Main()
{
CallBackPtr callBackPtr = new CallBackPtr(EnumReport.Report);
EnumReport.EnumWindows(callBackPtr, 0);
}
VB.NET SAMPLE CODE
Imports System.Runtime.InteropServices
Public Class Form1
Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
components = New System.ComponentModel.Container
Me.Text = "Form1"
End Sub
#End Region
Public Delegate Function CallBack( _
ByVal hwnd As IntPtr, _
ByVal lParam As IntPtr) As Boolean
Public Declare Function EnumWindows Lib "user32" ( _
ByVal lpEnumFunc As CallBack, _
ByVal lParam As IntPtr) As Boolean
Public Function getAllWindowHandles() As ArrayList
Dim arlWindowHandlesList As New ArrayList
Dim gch As GCHandle = GCHandle.Alloc(arlWindowHandlesList)
Try
EnumWindows(AddressOf ReceiveAllWindowHandles, GCHandle.op_Explicit(gch))
Finally
gch.Free()
End Try
Return arlWindowHandlesList
End Function
Private Function ReceiveAllWindowHandles( _
ByVal hwnd As IntPtr, _
ByVal lParam As IntPtr) As Boolean
Dim gchTemp As GCHandle = GCHandle.op_Explicit(lParam)
Dim arlWindowHandlesList As ArrayList = DirectCast(gchTemp.Target, ArrayList)
arlWindowHandlesList.Add(hwnd)
Return True
End Function
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim cboHandles As ComboBox = New ComboBox
Dim arlHandles As ArrayList = getAllWindowHandles()
Me.Controls.Add(cboHandles)
cboHandles.Location = New Point(20, 20)
cboHandles.DataSource = arlHandles
End Sub
End Class
Alternative Managed API:
Do you know one? Please contribute it!
