这里需要用到的API是SetWinEventHook。你只需在你的应用程序启动时使用正确的选项调用它,就可以开始接收到有关用户从桌面上正在运行的任何进程切换焦点的通知。
[DllImport("user32.dll", SetLastError = true)]
internal static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc, WinEventProc lpfnWinEventProc, int idProcess, int idThread, uint dwflags);
[DllImport("user32.dll")]
internal static extern int UnhookWinEvent(IntPtr hWinEventHook);
internal delegate void WinEventProc(IntPtr hWinEventHook, uint iEvent, IntPtr hWnd, int idObject, int idChild, int dwEventThread, int dwmsEventTime);
const uint WINEVENT_OUTOFCONTEXT = 0;
const uint EVENT_SYSTEM_FOREGROUND = 3;
private IntPtr winHook;
private WinEventProc listener;
public void StartListeningForWindowChanges()
{
listener = new WinEventProc(EventCallback);
winHook = SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, listener, 0, 0, WINEVENT_OUTOFCONTEXT);
}
public void StopListeningForWindowChanges()
{
UnhookWinEvent(winHook);
}
private static void EventCallback(IntPtr hWinEventHook, uint iEvent, IntPtr hWnd, int idObject, int idChild, int dwEventThread, int dwmsEventTime)
{
}
Process.GetCurrentProcess()
将返回调用该方法的当前进程。我没有使用过多进程应用程序,因此没有足够的词汇来表达,因为首先需要理解一些重要术语... - King King