/// <summary>
/// Callback function that the system calls in response to event sytem foreground
/// </summary>
/// <param name="hWinEventHook">Handle to an event hook function</param>
/// <param name="eventType">Specifies the event that occurred</param>
/// <param name="hwnd">Handle to the window that generates the event, or NULL if no window is associated with the event</param>
/// <param name="idObject">Identifies the object associated with the event</param>
/// <param name="idChild">Identifies whether the event was triggered by an object or a child element of the object</param>
/// <param name="dwEventThread">Identifies the thread that generated the event, or the thread that owns the current window</param>
/// <param name="dwmsEventTime">Specifies the time, in milliseconds, that the event was generated</param>
private void ForegroundEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
if (idObject != 0 || idChild != 0 || eventType != (uint)EventConstants.EVENT_SYSTEM_FOREGROUND)
{
return;
}
ForegroundWindowChanged?.Invoke(this, new EventArgs());
}
protected override void WinEventCallback(WinEventConstant eventType, IntPtr handle, int objectId, int childId)
{
// Only process events related to FG capture
if (eventType != WinEventConstant.EVENT_SYSTEM_FOREGROUND && eventType != WinEventConstant.EVENT_SYSTEM_MINIMIZEEND)
{
return;
}
// Only process events with valid parameters
if (handle == null || objectId != 0)
{
return;
}
// Get process ID
_ = NativeMethods.GetWindowThreadProcessId(handle, out uint windowThreadProcId);
// Ignore these windows
var windowStyle = NativeMethods.GetWindowStyleEx(handle);
if ((windowStyle & WindowStylesEx.WS_EX_NOACTIVATE) == WindowStylesEx.WS_EX_NOACTIVATE)
{
return;
}
// Ignore ghost window when target is unresponsive
// Ghost windows take foreground but target window doesn't trigger EVENT_SYSTEM_FOREGROUND
// when responsive again.
var className = NativeMethods.GetClassName(handle);
var currentTitle = NativeMethods.GetWindowText(handle);
if (className == "Ghost" && _lastTitle == currentTitle)
{
return;
}
// Get process path
string processName = NativeMethods.GetFullProcessName((int)windowThreadProcId);
// Send event
ForegroundWindowChanged?.Invoke(this, new ForegroundWindowChangedEventArgs
{
Handle = handle,
WindowThreadProcId = windowThreadProcId,
ProcessPath = processName
});
// Store title
_lastTitle = currentTitle;
}
public static void CheckForegroundWindow(object sender, EventArgs e)
{
IntPtr hwnd = FocusManager.GetForegroundWindow();
FocusManager.GetWindowThreadProcessId(hwnd, out uint procId);
Process proc = Process.GetProcessById((int)procId);
if (proc.ProcessName == "TERA" || proc.ProcessName == "TCC" || proc.ProcessName == "devenv")
{
ForegroundWindowChanged?.Invoke(true);
}
else
{
ForegroundWindowChanged?.Invoke(false);
}
}
private void FireForegroundWindowChanged(IntPtr hwnd)
{
this.hwnd = hwnd;
ForegroundWindowChanged?.Invoke(hwnd);
}