JNA used in scala

scala-jna.scala

package test

import com.sun.jna._
import com.sun.jna.ptr._

trait Kernel32 extends Library {
  def GetDiskFreeSpaceA(lpRootPathName: String,
  	  lpSectorsPerCluster: IntByReference, lpBytesPerSector: IntByReference,
		  lpNumberOfFreeClusters: IntByReference, lpTotalNumberOfClusters: IntByReference): Boolean
  def GetComputerNameW(outName: Array[Char], size: IntByReference): Boolean
  def GetTempPathA(size: Integer, outName: Array[Byte]): Integer
}

object TestJNA {
  def main(args: Array[String]) {
    val lib = Native.loadLibrary("kernel32", classOf[Kernel32]).asInstanceOf[Kernel32]
    val disk = raw"C:\"
    val spc = new IntByReference(0) // Sectors per cluster
    val bps = new IntByReference(0) // Bytes per sector
    val fc = new IntByReference(0) // Free clusters
    val tc = new IntByReference(0) // Total clusters
    val ok = lib.GetDiskFreeSpaceA(disk, spc, bps, fc, tc) // status
    println(f"""'$disk%s' ($ok%s): sectors/cluster: ${spc.getValue}%d, 
    	bytes/sector: ${bps.getValue}%d, free-clusters: ${fc.getValue}%d,
    	total/clusters: ${tc.getValue}%d""") 
    	
    val name = new Array[Char](256)
    val size = new IntByReference(256)
    val ret = lib.GetComputerNameW(name, size)
    println("computer name: " + name.mkString + " ret: " + ret)
    
    {
      val name = new Array[Byte](256)
      lib.GetTempPathA(256, name)
      val s = name.map(_.toChar)
      println("temp path: " + s.mkString)
    }
  }
}