java-jna win32 api使用

package sample;

import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.WinDef;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

import java.io.UnsupportedEncodingException;


public class main1 {

    public interface User322 extends StdCallLibrary {
        User322 INSTANCE = (User322) Native.loadLibrary("user32", User322.class, W32APIOptions.DEFAULT_OPTIONS);
        WinDef.HWND FindWindow(String lpClassName, String lpWindowName);
        int GetWindowRect(WinDef.HWND handle, int[] rect);
        int SendMessage(WinDef.HWND hWnd, int msg, int wParam, byte[] lParam);
        WinDef.HWND FindWindowEx(WinDef.HWND parent, WinDef.HWND child, String className, String window);
        boolean EnumWindows(WNDENUMPROC lpEnumFunc, Pointer arg);
        boolean EnumChildWindows(WinDef.HWND parent, WNDENUMPROC callback, WinDef.LPARAM info);
        interface WNDENUMPROC extends StdCallCallback {