simple wrapper around Kernel32.dll GetDriveType function

gistfile1.as

package
{
	import mdm.DLL;
	import mdm.System;

	public class Kernel32
	{
		/* The drive type cannot be determined. */
		public static const DRIVE_UNKNOWN:int = 0;
		/* The root path is invalid; for example, there is no volume mounted at the specified path. */
		public static const DRIVE_NO_ROOT_DIR:int = 1;
		/* The drive has removable media; for example, a floppy drive, thumb drive, or flash card reader. */
		public static const DRIVE_REMOVABLE:int = 2;
		/* The drive has fixed media; for example, a hard drive or flash drive. */
		public static const DRIVE_FIXED:int = 3;
		/* The drive is a remote (network) drive. */
		public static const DRIVE_REMOTE:int = 4;
		/* The drive is a CD-ROM drive. */
		public static const DRIVE_CDROM:int = 5;
		public static const DRIVE_RAMDISK:int = 6;
		/**
		 * Determines whether a disk drive is a removable, fixed, CD-ROM, RAM disk, or network drive.
		 * see: http://msdn.microsoft.com/en-us/library/aa364939(v=vs.85).aspx
		 * @parameter driveRootPath The root directory for the drive. 
		 * A trailing backslash is required. 
		 * If this parameter is NULL, the function uses the root of the current directory.
		 * @return The return value specifies the type of drive, which can be one of the following values.
		 */
		public static function GetDriveType(driveRootPath:String):int
		{
			// reuse instance to preserve memory if not yet cleared
			if(Kernel32.dll != null)
			{
				Kernel32.dll.clear();
			} else
			{
				// path in system
				var path:String = mdm.System.Paths.system+"Kernel32.dll";
				Kernel32.dll = new mdm.DLL(path);
				// very simple error handling
				if(Kernel32.dll == null)
				{
					return Kernel32.DRIVE_UNKNOWN;
				};
			};
			Kernel32.dll.addParameter("string", driveRootPath);
			var results:int = Kernel32.dll.call("integer", "GetDriveTypeA") as int;
			Kernel32.dll.clear();
			Kernel32.dll.close();
			Kernel32.dll = null;
			return results;
		};
		//
		private static var dll:mdm.DLL = null;
	}
}