Get Application's Window Handles

Question

Hello Guys, I'm bulding an app that given another app mainWindowhandle it collects information about the window state, I've no problem collecting information about child windows but, I can not access the other open windows of an application or even the menus... Is there any way of getting all window handles of an application ?

Any ideas ?

Tks, Jose

Answer 1

You could do what Process.MainWindowHandle appears to do: use P/Invoke to call the EnumWindows function, which invokes a callback method for every top-level window in the system.

In your callback, call GetWindowThreadProcessId, and compare the window's process id with Process.Id; if the process ids match, add the window handle to a list.

Answer 2

First, you'll have to get the windowhandle of the application's mainwindow.

 [DllImport("user32.dll", SetLastError = true)]
 static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

 IntPtr hWnd = (IntPtr)FindWindow(windowName, null);

Then, you can use this handle to get all childwindows:

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool EnumChildWindows(IntPtr hwndParent, EnumWindowsProc lpEnumFunc, IntPtr lParam);

private List<IntPtr> GetChildWindows(IntPtr parent)  
{  
    List<IntPtr> result = new List<IntPtr>();  
    GCHandle listHandle = GCHandle.Alloc(result);  
    try  
    {  
         EnumWindowProc childProc = new EnumWindowProc(EnumWindow);  
         EnumChildWindows(parent, childProc, GCHandle.ToIntPtr(listHandle));  
    }  
    finally  
    {  
         if (listHandle.IsAllocated)  
               listHandle.Free();  
    }  
    return result;  
}