jna - JNA 鼠标钩子(Hook)的工作示例

Question

任何人都可以为我提供一个 JNA 鼠标钩子(Hook)的工作示例，它能够在我的 Java Swing 应用程序之外跟踪鼠标移动/单击吗？

提前致谢

Answer 1

是的，这里是代码...

public class CWMouseHook {
public final User32 USER32INST;
public final Kernel32 KERNEL32INST;
public CWMouseHook()
{
    if(!Platform.isWindows())
    {
        throw new UnsupportedOperationException("Not supported on this platform.");
    }
    USER32INST = User32.INSTANCE;
    KERNEL32INST = Kernel32.INSTANCE;
    mouseHook=hookTheMouse();
    Native.setProtected(true);

}
public static LowLevelMouseProc mouseHook;
public HHOOK hhk;
public Thread thrd;
public boolean threadFinish = true;
public boolean isHooked = false;
public static final int WM_MOUSEMOVE = 512;
public static final int WM_LBUTTONDOWN = 513;
public static final int WM_LBUTTONUP = 514;
public static final int WM_RBUTTONDOWN = 516;
public static final int WM_RBUTTONUP = 517;
public static final int WM_MBUTTONDOWN = 519;
public static final int WM_MBUTTONUP = 520;


public void unsetMouseHook()
{
    threadFinish = true;
    if (thrd.isAlive())
    {
        thrd.interrupt();
        thrd = null;
    }
    isHooked = false;
}
public boolean isIsHooked()
{
    return isHooked;
}
public void setMouseHook()
{
    thrd = new Thread(new Runnable() {
        @Override
        public void run()
            {
                  try
                  {
                        if(!isHooked)
                        {   
                            hhk = USER32INST.SetWindowsHookEx(14, mouseHook,KERNEL32INST.GetModuleHandle(null),0);
                            isHooked = true;
                            MSG msg = new MSG();
                            while ((USER32INST.GetMessage(msg, null, 0, 0)) != 0)
                            {
                                USER32INST.TranslateMessage(msg);     
                                USER32INST.DispatchMessage(msg);
                                System.out.print(isHooked);
                                if (!isHooked)
                                      break;
                            }
                        }
                        else
                            System.out.println("The Hook is already installed.");
                }
                catch (Exception e)
                {   System.err.println(e.getMessage());
                    System.err.println("Caught exception in MouseHook!");
                }
        }
    },"Named thread");
    threadFinish = false;
    thrd.start();

}
private interface LowLevelMouseProc extends HOOKPROC
{
    LRESULT callback(int nCode, WPARAM wParam, MOUSEHOOKSTRUCT lParam);
}
public LowLevelMouseProc hookTheMouse() {
    return new LowLevelMouseProc()
    {
        @Override
        public LRESULT callback(int nCode, WPARAM wParam, MOUSEHOOKSTRUCT info) {
            if (nCode >= 0)
            {
                switch(wParam.intValue())
                {
                    case CWMouseHook.WM_LBUTTONDOWN:
                        // do stuff
                        break;
                    case CWMouseHook.WM_RBUTTONDOWN:
                        //do stuff
                        break;
                    case CWMouseHook.WM_MBUTTONDOWN:
                        //do other stuff
                        break;
                    case CWMouseHook.WM_LBUTTONUP:
                         //do even more stuff
                         break;
                    case CWMouseHook.WM_MOUSEMOVE:

                        break;                         
                    default:
                        break;
                }
                 /****************************DO NOT CHANGE, this code unhooks mouse *********************************/
                 if (threadFinish == true)
                  {                      
                     USER32INST.PostQuitMessage(0);
                  }
                /***************************END OF UNCHANGABLE *******************************************************/
            }
            return USER32INST.CallNextHookEx(hhk, nCode, wParam, info.getPointer());
        }
    };
}
public class Point extends Structure
{
    public class ByReference extends Point implements Structure.ByReference {};
    public NativeLong x;
    public NativeLong y;
}
public static class MOUSEHOOKSTRUCT extends Structure
{
    public static class ByReference extends MOUSEHOOKSTRUCT implements Structure.ByReference {};
    public POINT pt;
    public HWND hwnd;
    public int wHitTestCode;
    public ULONG_PTR dwExtraInfo;
}

这就是它的全部内容。干杯。
它基本上是对 Sun 论坛中某个人的代码的抄袭……但也经过我的测试，它再次运行得如此欢呼。

编辑:我编辑了代码，使其包含 LowLevelMouseProc 但您可以使用您可以在其他地方定义的 HOOK 扩展。没关系。请注意，由于某种原因，您必须将变量 mouseHook 作为静态变量，否则钩子(Hook)会在一段时间后解开。