前言
本文通过Java的Runtime接口来实现调用其他语言实现的应用程序,进而来实现对计算机硬件信息的监控和控制.本文是多媒体信息系统的一个部分,就是调整计算机音量.
使用VC编写音量控制程序
本控制示例使用Vc6.0编写,主要是调用系统的APi来实现,
mixerGetLineInfo 获取Master Volume Control.
mixerGetControlDetails 获取 Volume Control 信息
mixerSetControlDetails 设置 Volume Control 信息
最终编译成Console类型的Dos执行的程序VolumeControl.exe
实现三个功能:
1.获取音量 VolumeControl.exe 0
2.增加音量 VolumeControl.exe 1
3.减少音量 VolumeControl.exe 2
创建一个Panel用于显示音量并操作应用程序实现对音量的实际控制,本例中使用自定义Progress显示.VolumeTracker.java
实现原理如下:
使用一个线程动态刷新页面,主线程用来实现对音量的控制.其实现代码如下:
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.text.java/text/AttributedString.java.html" target="_blank">AttributedString;
import java.text.java/text/AttributedCharacterIterator.java.html" target="_blank">AttributedCharacterIterator;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
import javax.swing.event.*;
import java.io.*;
public class VolumeTracker extends JPanel implements java/lang/Runnable.java.html" target="_blank">Runnable {
java/lang/String.java.html" target="_blank">String welcomeStr = "Welcome to Java Sound";
java/lang/Thread.java.html" target="_blank">Thread pbThread;
Color background = Color.white; //new Color(20, 20, 20);
Color jfcBlue = Color.blue; //new Color(204, 204, 255);
Color jfcDarkBlue = jfcBlue.darker();
Font font24 = new Font("serif", Font.BOLD, 24);
Font font28 = new Font("serif", Font.BOLD, 28);
Font font42 = new Font("serif", Font.BOLD, 42);
FontMetrics fm28, fm42;
java/lang/String.java.html" target="_blank">String errStr=null;
java/lang/String.java.html" target="_blank">String currentName=null;
double duration = 100.0;
double seconds = 82.0;
boolean midiEOM, audioEOM;
public VolumeTracker() {
fm28 = getFontMetrics(font28);
fm42 = getFontMetrics(font42);
initVolume();
start();
}
private void initVolume(){
try{
//这一段小程序实现对VC创建程序的调用
java/lang/Runtime.java.html" target="_blank">Runtime rt = java/lang/Runtime.java.html" target="_blank">Runtime.getRuntime();
//Time and Date.
//mngPathTool类,提供了一个获取当前路径的方法
mngPathTool tool = new mngPathTool();
java/lang/String.java.html" target="_blank">String sexec = tool.getCurPath()+ "\\binex\\VolumeControl.exe 0";
java/lang/Process.java.html" target="_blank">Process child = rt.exec(sexec);
//获取控制台输出的内容,进而获得音量的大小
InputStreamReader reader = new InputStreamReader(child.getInputStream());
char[] chr = new char[5];
reader.read(chr) ;
java/lang/String.java.html" target="_blank">String s="";
for(int i=0;i<5;i++){
if(chr[i]>='0' && chr[i]<='9')
s+=chr[i];
}
//System.out.println(s);
java/lang/Integer.java.html" target="_blank">Integer nVolume = new java/lang/Integer.java.html" target="_blank">Integer(s);
seconds = nVolume.intValue();
child.waitFor();
//这一段小程序实现对VC创建程序的调用
}catch(java/lang/Exception.java.html" target="_blank">Exception e1){e1.printStackTrace(); }
}
public void paint(Graphics g) {
//画图来实现百分比Tracker
Graphics2D g2 = (Graphics2D) g;
Dimension d = getSize();
g2.setBackground(background);
g2.clearRect(0, 0, d.width, d.height);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(jfcBlue);
double tseconds = duration-seconds;
if (tseconds > 0.0) {
int num = 20;
int progress = (int) (tseconds / duration * num);
double hh = ((double) (d.height - 4) / (double) num);
double ww = (int)(d.width-4);
double x = 0.0;
for ( ; x < progress; x+=1.0) {
g2.fill(new Rectangle2D.Double(d.width-ww-2, x*hh+2, ww, hh));
g2.fill3DRect((int)(d.width-ww-2),(int) (x*hh+2),(int) ww, (int)hh,true);
}
g2.setColor(jfcDarkBlue);
for ( ; x < num; x+=1.0) {
g2.fill(new Rectangle2D.Double(d.width-ww-2, x*hh+2, ww, hh));
g2.fill3DRect((int)(d.width-ww-2),(int) (x*hh+2),(int) ww, (int)hh,true);
}
}
}
public void start() {
pbThread = new java/lang/Thread.java.html" target="_blank">Thread(this);
pbThread.setName("PlaybackMonitor");
pbThread.start();
}
public void stop() {
if (pbThread != null) {
pbThread.interrupt();
}
pbThread = null;
}
public void run() {
while (pbThread != null) {
try {
pbThread.sleep(99);
} catch (java/lang/Exception.java.html" target="_blank">Exception e) { break; }
repaint();
}
pbThread = null;
}
public void addVolume(){
changeVolume(false);
initVolume();
}
public void minusVolume(){
changeVolume(true);
initVolume();
}
//control sound volume.
private void changeVolume(boolean bIsMinus){
try{
java/lang/Runtime.java.html" target="_blank">Runtime rt = java/lang/Runtime.java.html" target="_blank">Runtime.getRuntime();
//Sound Control
mngPathTool tool = new mngPathTool();
java/lang/String.java.html" target="_blank">String sexec;
if(bIsMinus)
sexec= tool.getCurPath()+ "\\binex\\VolumeControl.exe 2";
else
sexec= tool.getCurPath()+ "\\binex\\VolumeControl.exe 1";
rt.exec(sexec);
}catch(java/lang/Exception.java.html" target="_blank">Exception e1){e1.printStackTrace(); }
}
} // End VolumeTracker
创建一个JFrame用于显示 VolumeControl.java
设置页面背景,创建显示上述Panel的容器.
创建对话框用于弹出显示音量控制界面 JVolumeDlg.java
创建一个对话框来显示上个步骤生成的Frame,并提供事件控制容器.
事件流向--->
JVolumeDlg -- VolumeControl --- VolumeTracker
总结
Java Runtime 接口提供了调用其他应用程序的接口,通过这个接口,可以实现对计算机硬件的控制和监控. 同时通过界面线程可以实现相对复杂的应用程序界面的开发.
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2006/9/7 16:36:00
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在Java中调用exe实现对计算机音量的控制