Convert C# to PowerBuilder Classic 12.5

Hi Everyone, 

I need some help, how to convert following C# code into 

powerscript inPowerBuilder Classic 12.5:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Autodesk.AutoCAD;      //申明CAD空间
using Autodesk.AutoCAD.Interop;
using Autodesk.AutoCAD.Interop.Common;
//测试环境 AutoCAD12
//引用版本 AutoCAD 2012 Type Library
//引用DBX版本  AutoCAD/ObjectDBX Common 16.0 Type Library
//引用 Microsoft.VisualBasic.dll
//不要开其它版本测试

namespace WindowsFormsApplication1
{
        public partial class Form1 : Form
    {       
        public Form1()
        {
            InitializeComponent();
        }

       Autodesk.AutoCAD.Interop.AcadApplication AcadApp; //申明CAD
       Autodesk.AutoCAD.Interop.AcadDocument AcadDoc;    //申明文档

       private void Form1_Load(object sender, EventArgs e)
       {

       } 
        private void button1_Click(object sender, EventArgs e)
        {

            double[] Po =new double[3]{0, 0, 0};   //默认起点
            // 循环使用多个点时，后面将Pt的值给到Po；

            AcadApp = (AcadApplication)System.Runtime.InteropServices.Marshal.GetActiveObject("AutoCAD.Application");
            Microsoft.VisualBasic.Interaction.AppActivate(AcadApp.Caption); //激活当前打开的CAD图档
            AcadDoc = AcadApp.ActiveDocument;    //将文档移动当前激活的图档
            
            Object Vart = AcadDoc.Utility.GetPoint(Po, "请拾取坐标点：");    //定义用户选取的点坐标对象          
           double[] Pt = (Double[])Vart;     //将制将点对象转化为双精度数值
          textBox1.Text =Pt[0].ToString();   //将双精度数值转为字符串，传回窗体
          textBox2.Text = Pt[1].ToString();
          textBox3.Text = Pt[2].ToString();
        }

              
    }
}

Thanks

regards