<%@ WebHandler Language="C#" Class="generator" %>

using System;
using System.Web;
using System.IO;
using BarcodeLib;
using System.Drawing;
using System.Drawing.Imaging;

public class generator : IHttpHandler {


    MyWeb.function f = new MyWeb.function();

    public void ProcessRequest (HttpContext context) {

        if (!f.isStrNull(context.Request["val"]))
        {
            try
            {
                MemoryStream oStream = new MemoryStream();
                CreateValidateCodeImage(ref oStream);
                context.Response.ClearContent();
                context.Response.ContentType = "image/Gif";
                context.Response.BinaryWrite(oStream.ToArray());
            }
            catch (Exception ex)
            {
                context.Response.ContentType = "text/plain";
                context.Response.Write(ex.Message);
            }
        }
        else
        {
            context.Response.ContentType = "text/plain";
            context.Response.Write("No data");
        }


    }

    public void CreateValidateCodeImage(ref MemoryStream MemoryStream)
    {

        Bitmap oBmp = CreateValidateCodeImage();
        try
        {
            oBmp.Save(MemoryStream, ImageFormat.Gif);
        }
        catch (Exception)
        {
        }
        finally
        {
            oBmp.Dispose();
        }
    }

    public Bitmap CreateValidateCodeImage()
    {

        //設定字型
        int FontSize = 10;
        if ( !f.isStrNull(HttpContext.Current.Request["fontsize"])  && f.IsNumeric(HttpContext.Current.Request["fontsize"]))
            FontSize = f.Val(HttpContext.Current.Request["fontsize"]);

        Font oFont = new Font("Times New Roman", FontSize, FontStyle.Regular);

        Barcode bc = new Barcode();
        bc.IncludeLabel = true;
        bc.Alignment = AlignmentPositions.CENTER;
        bc.Width =!f.isStrNull(HttpContext.Current.Request["w"]) && f.IsNumeric(HttpContext.Current.Request["w"])?f.Val(HttpContext.Current.Request["w"]):400;
        bc.Height =!f.isStrNull(HttpContext.Current.Request["h"]) && f.IsNumeric(HttpContext.Current.Request["h"])?f.Val(HttpContext.Current.Request["h"]):200;
        bc.RotateFlipType = RotateFlipType.RotateNoneFlipNone;
        bc.LabelFont = oFont;
        bc.BackColor = Color.White;
        bc.ForeColor = Color.Black;

        string data = f.ValString(HttpContext.Current.Request["val"]);

        string type = f.ValString(HttpContext.Current.Request["type"]);
        if (type == "39")
            return (Bitmap)bc.Encode(TYPE.CODE39, data);
        else if (type == "128")
            return (Bitmap)bc.Encode(TYPE.CODE128, data);
        else if (type == "ISBN")
            return (Bitmap)bc.Encode(TYPE.ISBN, data);
        else if (type == "ITF")
            return (Bitmap)bc.Encode(TYPE.ITF14, data);
        else if (type == "EAN13")
            return (Bitmap)bc.Encode(TYPE.EAN13, data);
        else if (type == "EAN8")
            return (Bitmap)bc.Encode(TYPE.EAN8, data);
        else
            return (Bitmap)bc.Encode(TYPE.CODE39, data);

    }

    public bool IsReusable {
        get {
            return false;
        }
    }


}