Home  |  About  |   Search   

What's New
Table Of Contents
Credits
Netiquette
10 Commandments 
Bugs
Tables
Queries
Forms
Reports
Modules
APIs
Strings
Date/Time
General
Downloads
Resources
Search
Feedback
mvps.org

RunCommand Constants

Terms of Use


 

API: Get Class name of a running app

Author(s)
Dev Ashish

(Q)    How do I find out the Class Name of a running application?
(A)    Paste the following code in a new module and then run the function fEnumWindows from the Debug window. The function will print out the Class Name and Caption of all running applications that are currently visible.

'************** Code Start ***************
' This code was originally written by Dev Ashish.
' It is not to be altered or distributed,
' except as part of an application.
' You are free to use it in any application,
' provided the copyright notice is left unchanged.
'
' Code Courtesy of
' Dev Ashish
'
Private Declare Function apiGetClassName Lib "user32" Alias _
                "GetClassNameA" (ByVal Hwnd As Long, _
                ByVal lpClassname As String, _
                ByVal nMaxCount As Long) As Long
Private Declare Function apiGetDesktopWindow Lib "user32" Alias _
                "GetDesktopWindow" () As Long
Private Declare Function apiGetWindow Lib "user32" Alias _
                "GetWindow" (ByVal Hwnd As Long, _
                ByVal wCmd As Long) As Long
Private Declare Function apiGetWindowLong Lib "user32" Alias _
                "GetWindowLongA" (ByVal Hwnd As Long, ByVal _
                nIndex As Long) As Long
Private Declare Function apiGetWindowText Lib "user32" Alias _
                "GetWindowTextA" (ByVal Hwnd As Long, ByVal _
                lpString As String, ByVal aint As Long) As Long
Private Const mcGWCHILD = 5
Private Const mcGWHWNDNEXT = 2
Private Const mcGWLSTYLE = (-16)
Private Const mcWSVISIBLE = &H10000000
Private Const mconMAXLEN = 255

Function fEnumWindows()
Dim lngx As Long, lngLen As Long
Dim lngStyle As Long, strCaption As String
    
    lngx = apiGetDesktopWindow()
    'Return the first child to Desktop
    lngx = apiGetWindow(lngx, mcGWCHILD)
    
    Do While Not lngx = 0
        strCaption = fGetCaption(lngx)
        If Len(strCaption) > 0 Then
            lngStyle = apiGetWindowLong(lngx, mcGWLSTYLE)
            'enum visible windows only
            If lngStyle And mcWSVISIBLE Then
                Debug.Print "Class = " & fGetClassName(lngx),
                Debug.Print "Caption = " & fGetCaption(lngx)
            End If
        End If
        lngx = apiGetWindow(lngx, mcGWHWNDNEXT)
    Loop
End Function
Private Function fGetClassName(Hwnd As Long) as String
    Dim strBuffer As String
    Dim intCount As Integer
   
    strBuffer = String$(mconMAXLEN - 1, 0)
    intCount = apiGetClassName(Hwnd, strBuffer, mconMAXLEN)
    If intCount > 0 Then
        fGetClassName = Left$(strBuffer, intCount)
    End If
End Function

Private Function fGetCaption(Hwnd As Long) As String
    Dim strBuffer As String
    Dim intCount As Integer

    strBuffer = String$(mconMAXLEN - 1, 0)
    intCount = apiGetWindowText(Hwnd, strBuffer, mconMAXLEN)
    If intCount > 0 Then
        fGetCaption = Left$(strBuffer, intCount)
    End If
End Function
'************** Code End ***************

1998-2009, Dev Ashish & Arvin Meyer, All rights reserved. Optimized for Microsoft Internet Explorer