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Open or close a CD/DVD driveTag(s): IO


Java provides no way to interact with a cd drive.

One easy way on the Windows plateform is to call a VBS script.

In this HowTo, we are creating a temporary vbs file and execute it. This technique is useful to do something that a regular Java can't do because it's too specific to OS where the Java is running. The vbs file is created in the "temporary" folder and is deleted by the JVM at the end.

import java.io.File;
import java.io.FileWriter;

public class CDUtils {
  private CDUtils() {  }

  public static void open(String drive) {
    try {
        File file = File.createTempFile("realhowto",".vbs");
        file.deleteOnExit();
        FileWriter fw = new java.io.FileWriter(file);
        String vbs = "Set wmp = CreateObject(\"WMPlayer.OCX\") \n"
                   + "Set cd = wmp.cdromCollection.getByDriveSpecifier(\""
                   + drive + "\") \n"
                   + "cd.Eject";
        fw.write(vbs);
        fw.close();
        Runtime.getRuntime().exec("wscript " + file.getPath()).waitFor();
        // thanks to TrueJavaProgammer for the waitFor() tip!      
        // Runtime.getRuntime().exec("wscript " + file.getPath()).waitFor();
        // Thread.sleep(2000);
    }
    catch(Exception e){
        e.printStackTrace();
    }
  }

  public static void close(String drive) {
    try {
        File file = File.createTempFile("realhowto",".vbs");
        file.deleteOnExit();
        FileWriter fw = new FileWriter(file);
        // to close a CD, we need eject two times!
        String vbs = "Set wmp = CreateObject(\"WMPlayer.OCX\") \n"
                   + "Set cd = wmp.cdromCollection.getByDriveSpecifier(\""
                   + drive + "\") \n"
                   + "cd.Eject \n "
                   + "cd.Eject ";
        fw.write(vbs);
        fw.close();
        Runtime.getRuntime().exec("wscript " + file.getPath()).waitFor();
        // thanks to TrueJavaProgammer for the waitFor() tip!      
        // Runtime.getRuntime().exec("wscript "+ file.getPath());
        // Thread.sleep(2000);
    }
    catch(Exception e){
        e.printStackTrace();
    }
  }

  public static void main(String[] args){
    javax.swing.JOptionPane.showConfirmDialog((java.awt.Component)
               null, "Press OK to open CD", "CDUtils",
               javax.swing.JOptionPane.DEFAULT_OPTION);
    CDUtils.open("D:\\");
    javax.swing.JOptionPane.showConfirmDialog((java.awt.Component)
         null, "Press OK to close CD", "CDUtils",
         javax.swing.JOptionPane.DEFAULT_OPTION);
    CDUtils.close("D:\\");
  }
}
NOTE : Windows Media Player version 7 or later is required
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