?
Solved

Enumerate Windows

Posted on 2004-10-07
4
Medium Priority
?
184 Views
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.
0
Comment
Question by:emily_hall
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 7

Expert Comment

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

0
 
LVL 18

Accepted Solution

by:
armoghan earned 2000 total points
ID: 12256690
0
 
LVL 28

Expert Comment

by:iboutchkine
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))
        'ListBox1.Refresh()

        Me.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 & """"
            ListBox1.Items.Add(WindowDescription)
            ListBox1.Refresh()
        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
0
 
LVL 1

Author Comment

by:emily_hall
ID: 12263685
That PAQ showed a super quick and simple way to get what I needed.  Thanks!
0

Featured Post

New feature and membership benefit!

New feature! Upgrade and increase expert visibility of your issues with Priority Questions.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Well, all of us have seen the multiple EXCEL.EXE's in task manager that won't die even if you call the .close, .dispose methods. Try this method to kill any excels in memory. You can copy the kill function to create a check function and replace the …
A while ago, I was working on a Windows Forms application and I needed a special label control with reflection (glass) effect to show some titles in a stylish way. I've always enjoyed working with graphics, but it's never too clever to re-invent …
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.
How to fix incompatible JVM issue while installing Eclipse While installing Eclipse in windows, got one error like above and unable to proceed with the installation. This video describes how to successfully install Eclipse. How to solve incompa…

765 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question