Question

我正在尝试捕获Window的活动窗口更改事件。假设用户正在使用VS并切换到IE，我想捕获此活动窗口更改事件。我在互联网上搜索并找到了很多例子，但似乎没有什么对我有用。

这是我到目前为止编写的代码，我不确定这有什么问题。我无法通过此

捕获所需的事件

class Program
{
    delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);

    [DllImport("user32.dll")]
    static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);

    private const uint WINEVENT_OUTOFCONTEXT = 0;
    private const uint EVENT_SYSTEM_FOREGROUND = 3;

    static void Main(string[] args)
    {
        WinEventDelegate dele = new WinEventDelegate(WinEventProc);
        IntPtr m_hhook = SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, dele, 0, 0, WINEVENT_OUTOFCONTEXT);
        Console.ReadKey();
    }

    static void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
    {
        Console.WriteLine("Something");
    }
}

WinEventProc永远不会被调用，任何人都可以通过编程或概念来识别我做错了什么吗？我正在使用Windows 7

Answer 1

你需要抽取消息来接收WinEvents - 而Console.ReadKey（）可能不会这样做。现在尝试使用MessageBox进行测试 - 稍后用适当的消息循环替换。

来自MSDN：

备注：
...
调用SetWinEventHook的客户端线程必须具有消息循环才能接收事件

Answer 2

添加事件循环并在void man中调用它我改变了你的代码它现在正常工作。

public  class Program
{
    delegate void WinEventDelegate(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime);

    [DllImport("user32.dll")]
    static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);

    private const uint WINEVENT_OUTOFCONTEXT = 0;
    private const uint EVENT_SYSTEM_FOREGROUND = 3;

    static void Main(string[] args)
    {
        WinEventDelegate dele = new WinEventDelegate(WinEventProc);
        IntPtr m_hhook = SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_FOREGROUND, IntPtr.Zero, dele, 0, 0, WINEVENT_OUTOFCONTEXT);
        EventLoop.Run();
      //  Console.ReadKey();
    }

    static void WinEventProc(IntPtr hWinEventHook, uint eventType, IntPtr hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
    {
        Console.WriteLine(hwnd.ToString());
    }
}
   public static class EventLoop
    {
        public static void Run()
        {
            MSG msg;

            while (true)
            {

                if (PeekMessage(out msg, IntPtr.Zero, 0, 0, PM_REMOVE))
                {
                    if (msg.Message == WM_QUIT)
                        break;

                    TranslateMessage(ref msg);
                    DispatchMessage(ref msg);
                }
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct MSG
        {
            public IntPtr Hwnd;
            public uint Message;
            public IntPtr WParam;
            public IntPtr LParam;
            public uint Time;
        }

        const uint PM_NOREMOVE = 0;
        const uint PM_REMOVE = 1;

        const uint WM_QUIT = 0x0012;

        [DllImport("user32.dll")]
        private static extern bool PeekMessage(out MSG lpMsg, IntPtr hwnd, uint wMsgFilterMin, uint wMsgFilterMax, uint wRemoveMsg);
        [DllImport("user32.dll")]
        private static extern bool TranslateMessage(ref MSG lpMsg);
        [DllImport("user32.dll")]
        private static extern IntPtr DispatchMessage(ref MSG lpMsg);
    }
}e

捕获活动窗口更改事件的问题

2 个答案: