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Enumerate Windows

Posted on 2004-10-07
Medium Priority
Last Modified: 2010-04-23
I need to go through the currently open windows and get the thread id of a certain application so I can post messages to it...  Is there some way to do this in VB.NET I am missing?  Every example I've found is in VB and using a bunch of stuff that won't work in .NET.
Question by:emily_hall
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Expert Comment

ID: 12255517
Have you used the 'GetCurrentThreadId()' function?

LVL 18

Accepted Solution

armoghan earned 2000 total points
ID: 12256690
LVL 28

Expert Comment

ID: 12258044
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "
#End Region
    Delegate Function EnumWindows_Callback(ByVal hWnd As Integer, ByVal lParam As Integer) As Integer

    Public Declare Function EnumWindows Lib "user32" (ByVal lpEnumFunc As EnumWindows_Callback, ByVal lParam As Integer) As Integer
    Public Declare Function EnumChildWindows Lib "user32" (ByVal hWndParent As Integer, ByVal lpEnumFunc As EnumWindows_Callback, ByVal lParam As Integer) As Integer
    Public Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hWnd As Integer, ByVal lpClassName As System.Text.StringBuilder, ByVal nMaxCount As Integer) As Integer
    Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hWnd As Integer, ByVal lpString As System.Text.StringBuilder, ByVal cch As Integer) As Integer

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        EnumWindows(AddressOf EnumWindows_CBK, 0)
        Label1.Text = ListBox1.Items.Count & " windows"
    End Sub

    ' The callback routine, common to both EnumWindows and EnumChildWindows.
    ' the argument passed in lParam is the indent level.

    Function EnumWindows_CBK(ByVal hWnd As Integer, ByVal lParam As Integer) As Integer
        ' display information on this window, with correct indentation
        '        Console.WriteLine(New String(" "c, lParam * 3) & WindowDescription(hWnd))
        'Dim s As String
        's = New String(" "c, lParam * 3)
        'ListBox1.Items.Add(s & WindowDescription(hWnd))


        ' then display all child windows, but indent them to the right
        EnumChildWindows(hWnd, AddressOf EnumWindows_CBK, lParam + 1)
        ' Return 1 to continue enumeration.
        Return 1
    End Function

    ' return a windows description given its hWnd

    Function WindowDescription(ByVal hWnd As Integer) As String
        Dim text As String
        text = WindowText(hWnd)

        '        WindowDescription = "[" & Right$("0000000" & Hex$(hWnd), 8) & "] " & WindowClassName(hWnd)
        WindowDescription = "[Hnd-" & Hex$(hWnd) & "] Cls-" & WindowClassName(hWnd)
        'all windows
        If Len(text) > 0 Then
            'if I need to find certain window
            'If Len(text) > 0 AndAlso text = "VBCodeLibrary Tool" Then

            WindowDescription &= " - Wnd Name""" & text & """"
        End If
    End Function

    ' Return the caption/text of a window.

    Function WindowText(ByVal hWnd As Integer) As String
        Dim buffer As New System.Text.StringBuilder(256)
        Dim length As Integer
        length = GetWindowText(hWnd, buffer, buffer.Capacity)
        WindowText = buffer.ToString.Substring(0, length)
    End Function

    Function WindowClassName(ByVal hWnd As Integer) As String
        Dim buffer As New System.Text.StringBuilder(256)
        Dim length As Integer
        length = GetClassName(hWnd, buffer, buffer.Capacity)
        WindowClassName = buffer.ToString.Substring(0, length)
    End Function

End Class

Author Comment

ID: 12263685
That PAQ showed a super quick and simple way to get what I needed.  Thanks!

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