private async Task TestWinEventHook()
{
// This takes care of having a WinProc handler, to make sure the messages arrive
var winProcHandler = WinProcHandler.Instance;
// This buffers the observable
var replaySubject = new ReplaySubject <IInteropWindow>();
var winEventObservable = WinEventHook.WindowTitleChangeObservable()
.Select(info => InteropWindowFactory.CreateFor(info.Handle).Fill())
.Where(interopWindow => !string.IsNullOrEmpty(interopWindow?.Caption))
.Subscribe(interopWindow =>
{
Log.Debug().WriteLine("Window title change: Process ID {0} - Title: {1}", interopWindow.Handle, interopWindow.Caption);
replaySubject.OnNext(interopWindow);
}, exception => Log.Error().WriteLine("An error occured", exception));
await Task.Delay(100);
// Start a process to test against
using (var process = Process.Start("notepad.exe"))
{
try
{
// Make sure it's started
Assert.NotNull(process);
// Wait until the process started it's message pump (listening for input)
process.WaitForInputIdle();
User32Api.SetWindowText(process.MainWindowHandle, "TestWinEventHook - Test");
// Find the belonging window
var notepadWindow = await replaySubject.Where(info => info != null && info.ProcessId == process.Id).FirstAsync();
Assert.Equal(process.Id, notepadWindow?.ProcessId);
}
finally
{
winEventObservable.Dispose();
process?.Kill();
}
}
}