使用JNA从java中使用Windows的CreateEvent（）函数

Question

我编写了以下类来包装win32事件对象的创建

import com.sun.jna.*;
import com.sun.jna.Native;
import com.sun.jna.platform.win32.*;
import com.sun.jna.platform.win32.Kernel32;

/**
 * Wraps a (newly-created) native win32 event object and allows you to signal it.
 * 
 * The created event object is manual-reset and is initially un-set.
 */
public final class Win32Event
{
    private static final Kernel32 INSTANCE = (Kernel32) Native.loadLibrary("Kernel32", Kernel32.class);

    private WinNT.HANDLE m_handle = null;

    public Win32Event(String in_eventName)
    {
        assert null != in_eventName;

        m_handle = INSTANCE.CreateEvent(null, true, false, in_eventName);

        assert !Pointer.NULL.equals(m_handle.getPointer());
    }

    public void signal()
    {
        assert isValid();

        INSTANCE.SetEvent(m_handle);
    }

    /**
     * @return True if the event handle hasn't been freed with free().
     */
    public boolean isValid()
    {
        return null != m_handle;
    }

    /**
     * Frees the wrapped event handle. This must be done to prevent handle leaks.
     */
    public void free()
    {
        if (isValid())
        {
            INSTANCE.CloseHandle(m_handle);

            m_handle = null;
        }
    }

    @Override
    protected void finalize()
    {
        free();
    }
}

我在Windows7机器上使用JNA3.3，当我试图创建这个类的实例时，我得到了以下堆栈跟踪。

线程“main”java.lang.UnsatifiedLinkError中出现异常：查找函数“CreateEvent”时出错：找不到指定的过程。

Answer 1

我将代码从执行instance.[method]改为使用kernel32.instance.[method]。

我通过查看kernel32的定义并注意到它有一个静态实例变量来解决这个问题。