Solved

disk volume label

Posted on 2002-04-04
6
572 Views
Last Modified: 2008-02-01
how can i read the volume label of a disk?
i want to build a cd catalog-application
it just has to run on windows
0
Comment
Question by:atombender
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 9

Expert Comment

by:Ovi
ID: 6917882
If you want to use JDK 1.4 you don't have to ask yourself this question, itdoes automatically this for you. Try to use for example a JFileChooser from JDK1.4.

If not, I believe with native code invoked by Java (Using Runtime.getDefaultRuntime().execute("cmd") and reading from the input stream of the resulted process).
0
 
LVL 9

Expert Comment

by:Ovi
ID: 6917885
Correction : (Using Runtime.getRuntime().execute("cmd") ....
0
 

Author Comment

by:atombender
ID: 6917951
unfortunately i have jdk1.3
0
Revamp Your Training Process

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action.

 

Expert Comment

by:rashidkamranbs
ID: 6919037
import java.io.*;

public class Test{
     public static void main(String args[])throws Exception{
          Runtime rt=Runtime.getRuntime();
          Process p=rt.exec("chkdsk f:");
          BufferedReader in=new BufferedReader(new InputStreamReader(p.getInputStream()));
          System.out.println(in.readLine());
          System.out.println(in.readLine());
          p.destroy();
         
     }
}
OUT PUT IS
The type of the file system is FAT32.
Volume PROGRAMS created 10/22/2001 9:39 AM

Its a bit funny .. but belive me reads the Volume label and type of drive F, there on Windows XP with JRE 1.3.. if ya have ne other progam that could write the Disk Volume you can use instead.. as i used chkdsk.. no internal command i think

points as it works :-) kiddin
0
 
LVL 3

Accepted Solution

by:
msterjev earned 100 total points
ID: 6919274
OK. Some JNI looks like this:

Kernel32.java


import java.util.*;

public class Kernel32
{
     static
     {
          System.loadLibrary("JKernel32");
     }
     
     private static native String getLogicalDriveStrings();
     public static native String getVolumeLabel(String root);
     
     public static Enumeration enumLogicalDrives()
     {
          Vector v=new Vector();
          String drives=getLogicalDriveStrings();
          StringTokenizer st=new StringTokenizer(drives);
          while(st.hasMoreTokens())
               v.addElement(st.nextToken());
          return v.elements();
     }
}


Generate header with javah:

javah Kernel32

Start Visual C++ and make new dll with the name JKernel32.
Import here previously generate Kernel32.h.

Insert new C++ file and type here:

#include "Kernel32.h"
#include <windows.h>

JNIEXPORT jstring JNICALL Java_Kernel32_getLogicalDriveStrings(JNIEnv * env, jclass c)
{
     char buffer[256]={0};
     char drives[256]={0};
     ::GetLogicalDriveStrings(256,buffer);
     char *p=buffer;
     lstrcpy(drives,"");
     while(*p!=0)
     {
          strncat(drives,p,3);
          strcat(drives," ");
          p+=4;
     }
     return
          env->NewStringUTF(drives);
}


JNIEXPORT jstring JNICALL Java_Kernel32_getVolumeLabel(JNIEnv * env, jclass c, jstring r)
{
     const char *root=env->GetStringUTFChars(r,0);
     char volumeNameBuffer[MAX_PATH];
    DWORD lVolumeSerialNumber=0;
     DWORD lMaximumComponentLength=0;
     DWORD lFileSystemFlags=0;
     char fileSystemNameBuffer[10];
     if(::GetVolumeInformation(root,volumeNameBuffer,MAX_PATH,&lVolumeSerialNumber,&lMaximumComponentLength,&lFileSystemFlags,fileSystemNameBuffer,10))
     {
          env->ReleaseStringUTFChars(r,root);
          return env->NewStringUTF(volumeNameBuffer);
     }
     env->ReleaseStringUTFChars(r,root);
     return NULL;
}


Compile the project and put  JKernel32.dll into the same directory as Kernel32 class.

Try this:

Test.java

import java.util.*;

public class Test
{
     public static void main(String[] args)
     {
          String drive,label;
          Enumeration e=Kernel32.enumLogicalDrives();
          while(e.hasMoreElements())
          {
               drive=(String)e.nextElement();
               label=Kernel32.getVolumeLabel(drive);
               System.out.println(drive+":"+label);
          }
     }
}

Enjoy.

P.S. JNI is such a cool thing. You can extend Java with almost everything you want!!!!
0
 
LVL 3

Expert Comment

by:msterjev
ID: 6920402
Some comment.....
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
fibonacci ten numbers 4 54
How to convert from xls to xlsx using java 7 95
Tagging and Merging on Branch 1 44
Java pass by reference 3 22
By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question