jniframe.java

来自「java2的应用软件」· Java 代码 · 共 61 行

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class JNIFrame extends JFrame implements ActionListener
{
	int hwnd;
	String title="testJNI";
	JButton jb1,jb2,jb3,jb4;
	static
	{
		System.loadLibrary("WinLib");
	}
	 public static native int getHwnd(String title);
	 public static native void toFront(int hwnd);
	 public static native void flash(int hwnd);
	 public static native void noSizeChange(int hwnd);
	 public static native void restore(int hwnd);
	 public JNIFrame()
	 {
	 	JPanel jp=new JPanel();
	 	Container cp=getContentPane();
	 	jb1=new JButton("总在最前");
	 	jb2=new JButton("闪烁标题");
	 	jb3=new JButton("只显示标题栏");
	 	jb4=new JButton("恢 复");
	 	jp.setLayout(new FlowLayout());
	 	jp.add(jb1);
	 	jp.add(jb2);
	 	jp.add(jb3);
	 	jp.add(jb4);
	 	cp.add(jp);
	 	setTitle(title);
	 	setSize(250,100);
	 	jb1.addActionListener(this);
	 	jb2.addActionListener(this);
	 	jb3.addActionListener(this);
	 	jb4.addActionListener(this);
	 	this.addWindowListener(new WindowAdapter()
	 	{
	 		public void windowOpened(WindowEvent we)
	 		{
	 			hwnd=getHwnd(title);
	 			System.out.println(hwnd);
	 		}
	 	});
	 	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	 	setVisible(true);
	 	show();
	 }
	 public void actionPerformed(ActionEvent ae)
	 {
	 	if(ae.getSource()==jb1) toFront(hwnd);
	 	else if(ae.getSource()==jb2) flash(hwnd);
	 	else if(ae.getSource()==jb3) noSizeChange(hwnd);
	 	else restore(hwnd);
	 }
	 public static void main(String args[])
	 {
	 	new JNIFrame();
	 }
}