How to Enumerate Windows of a Specific Process in .NET?

Enumerating Windows of a Specific Process in .NET

Finding all windows created by a specific process is a common requirement in many applications. In .NET, several methods are available to achieve this task. One approach involves enumerating thread windows associated with the target process.

Using the EnumThreadWindows Function

The EnumThreadWindows function from the user32.dll library allows enumeration of all windows belonging to a particular thread. To enumerate windows of a specific process, you can iterate through its threads and invoke EnumThreadWindows for each thread.

Code Implementation:

The following delegate is used as a callback in EnumThreadWindows:

delegate bool EnumThreadDelegate(IntPtr hWnd, IntPtr lParam);

The following code snippet enumerates the window handles of a process using its process ID (PID):

static IEnumerable<IntPtr> EnumerateProcessWindowHandles(int processId)
{
    var handles = new List<IntPtr>();

    foreach (ProcessThread thread in Process.GetProcessById(processId).Threads)
        EnumThreadWindows(thread.Id, 
            (hWnd, lParam) => { handles.Add(hWnd); return true; }, IntPtr.Zero);

    return handles;
}

Sample Usage:

To demonstrate the usage, you can retrieve the window titles and print them to the console:

private const uint WM_GETTEXT = 0x000D;

[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, int wParam, 
    StringBuilder lParam);

[STAThread]
static void Main(string[] args)
{
    foreach (var handle in EnumerateProcessWindowHandles(
        Process.GetProcessesByName("explorer").First().Id))
    {
        StringBuilder message = new StringBuilder(1000);
        SendMessage(handle, WM_GETTEXT, message.Capacity, message);
        Console.WriteLine(message);
    }
}

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