Sample disk utils program based on example posted to SourceForge

samples/com/jacob/samples/system/DiskUtils.java

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+package com.jacob.samples.system;
+
+import java.text.DecimalFormat;
+
+import com.jacob.activeX.ActiveXComponent;
+import com.jacob.com.ComThread;
+import com.jacob.com.Dispatch;
+import com.jacob.com.Variant;
+
+/**
+ * Example VB script that grabs hard drive properties.
+ * <p>
+ * Source Forge posting http://sourceforge.net/forum/forum.php?thread_id=1785936&forum_id=375946
+ * <p>
+ * Enhance by clay_shooter with info from http://msdn2.microsoft.com/en-us/library/d6dw7aeh.aspx
+ * 
+ * @author qstephenson 
+ *
+ */
+public class DiskUtils {
+
+	/** formatters aren't thread safe but the sample only has one thread */
+	private static DecimalFormat sizeFormatter = new DecimalFormat("###,###,###,###");
+
+	/** a pointer to the scripting file system object */
+	private ActiveXComponent fileSystemApp = null;
+	
+	/** the dispatch that points at the drive this DiskUtil operates against */
+	private Dispatch myDrive = null;
+	
+	/**
+	 * Standard constructor
+	 */
+	public DiskUtils(String drive){
+		setUp(drive);
+	}
+	
+	/**
+	 * open the connection to the scripting object
+	 */
+	public void setUp(String drive){
+		if (fileSystemApp == null){
+		    ComThread.InitSTA();
+			fileSystemApp = new ActiveXComponent(
+					"Scripting.FileSystemObject");
+			myDrive = Dispatch.call(fileSystemApp, "GetDrive", drive)
+			.toDispatch();
+		}
+	}
+
+	/**
+	 * Do any needed cleanup
+	 */
+	public void tearDown() {
+		ComThread.Release();
+	}
+	
+	/**
+	 * convenience method
+	 * @return driver serial number
+	 */
+	public int getSerialNumber() {
+		return Dispatch.get(myDrive, "SerialNumber").getInt();
+	}
+	
+	/**
+	 * Convenience method.
+	 * We go through these formatting hoops so we can make the size string pretty.
+	 * We wouldn't have to do that if we didn't mind long strings with Exxx at the end
+	 * or the fact that the value returned can vary in size based on the size of the disk.
+	 * @return driver total size of the disk
+	 */
+	public String getTotalSize() {
+		Variant returnValue = Dispatch.get(myDrive, "TotalSize");
+		if (returnValue.getvt() == Variant.VariantDouble){
+			return sizeFormatter.format(returnValue.getDouble());
+		} else if (returnValue.getvt() == Variant.VariantInt){
+			return sizeFormatter.format(returnValue.getInt());
+		} else {
+			return "Don't know type: "+returnValue.getvt();
+		}
+	}
+	
+	/**
+	 * Convenience method.
+	 * We wouldn't have to do that if we didn't mind long strings with Exxx at the end
+	 * or the fact that the value returned can vary in size based on the size of the disk.
+	 * @return driver free size of the disk
+	 */
+	public String getFreeSpace() {
+		Variant returnValue = Dispatch.get(myDrive, "FreeSpace");
+		if (returnValue.getvt() == Variant.VariantDouble){
+			return sizeFormatter.format(returnValue.getDouble());
+		} else if (returnValue.getvt() == Variant.VariantInt){
+			return sizeFormatter.format(returnValue.getInt());
+		} else {
+			return "Don't know type: "+returnValue.getvt();
+		}
+	}
+	
+	/**
+	 * 
+	 * @return file system on the drive
+	 */
+	public String getFileSystemType() {
+		//figure ot the actual variant type
+		//Variant returnValue = Dispatch.get(myDrive, "FileSystem");
+		//System.out.println(returnValue.getvt());
+		return Dispatch.get(myDrive, "FileSystem").getString();
+	}
+
+	/**
+	 * 
+	 * @return volume name
+	 */
+	public String getVolumeName() {
+		return Dispatch.get(myDrive, "VolumeName").getString();
+	}
+	/**
+	 * Simple main program that creates a  DiskUtils object and queries for the C: drive
+	 */
+	public static void main(String[] args) {
+		//DiskUtils utilConnection = new DiskUtils("F");
+		DiskUtils utilConnection = new DiskUtils("C");
+		System.out.println("Disk serial number is: "+ utilConnection.getSerialNumber());
+		System.out.println("FileSystem is: "+ utilConnection.getFileSystemType());
+		System.out.println("Volume Name is: "+ utilConnection.getVolumeName());
+		System.out.println("Disk total size is: "+ utilConnection.getTotalSize());
+		System.out.println("Disk free space is: "+ utilConnection.getFreeSpace());
+		utilConnection.tearDown();
+	}
+}