asp.net (C #) generation of Code39 barcode instances

  This article mainly introduces ASP.net (C #) to generate Code39 Barcode Instance Barcode gun can be scanned out. Need friends can come to the reference, I hope to help you.

  Code as follows: using System; Using System.Collections; Using System.ComponentModel; Using System.Drawing; Using System.Data;   namespace MscL {   ///<summary>    ///generate barcode Code39    ///</summary>     public class Code39     {      private Hashtable m_code39 = new Hashtable (); &nbsp ;         private byte m_magnify = 0;        ///<summary>        ///magnification multiple        ///</ summary>         Public byte magnify {get {return m_magnify;} set {m_magnify = value;}} &nbsp ;         private int m_height = 40;        ///<summary>        ///Graphics high        ///</s ummary>         public int Height {get {return m_height;} set {m_height = value;}}   &NB Sp       PrivaTe Font m_viewfont = null;        ///<summary>        ///font size        ///</ summary>         public Font ViewFont {get {return m_viewfont;} set {M_viewfont = value;}} &N Bsp             public Code39 ()         {              M_code39.add ("A", "1101010010110");             M_code39.add ("B", "1011010010110");             M_code39.add ("C", "1101101001010");             M_code39.add ("D", "1010110010110");             M_code39.add ("E", "1101011001010");             M_code39.add ("F", "1011011001010");             M_code39.add ("G", "1010100110110");             M_code39.add ("H", "1101010011010");             M_code39.add ("I", "1011010011010");             M_code39.add ("J", "1010110011010");             M_code39.add ("K", "1101010100110");             M_code39.add ("L", "1011010100110");             M_code39.add ("M", "1101101010010");             M_code39.add ("N", "1010110100110");             M_code39.add ("O", "1101011010010");             M_code39.add ("P", "1011011010010");             M_code39.add ("Q", "1010101100110");             M_code39.add ("R", "1101010110010");             M_code39.add ("S", "1011010110010");             M_code39.add ("T", "1010110110010");             M_code39.add ("U", "1100101010110 ");             M_code39.add ("V", "1001101010110");             M_code39.add ("W", "1100110101010");             M_code39.add ("X", "1001011010110");             M_code39.add ("Y", "1100101101010");             M_code39.add ("Z", "1001101101010");             M_code39.add ("0", "1010011011010");             M_code39.add ("1", "1101001010110");             M_code39.add ("2", "1011001010110");             M_code39.add ("3", "1101100101010");             M_code39.add ("4", "1010011010110");             M_code39.add ("5", "1101001101010");             M_code39.add ("6", "1011001101010");             M_code39.add ("7", "1010010110110");             M_code39.add ("8", "1101001011010");             M_code39.add ("9", "1011001011010");             M_code39.add ("+", "1001010010010");             M_code39.add ("-", "1001010110110");             M_code39.add ("*", "1001011011010");             M_code39.add ("/", "1001001010010");             M_code39.add ("%", "1010010010010");            //m_code39.add ("Contentquot;," 1001001001010 ");             M_code39.add (".", "1100101011010");             M_code39.add ("", "1001101011010");           {          public enum Code39model       &NBSP ; {           ///<SUMMARY&GT            ///basic category 1234567890ABC            ///</summar y>             Code39normal,            ///<summary&gt ;            ///full ASCII mode +a+b to represent lowercase            ///</summa ry>             CODE39FULLASCII                 <summary>        ///get barcode graphics        ///</summary>        ///<param name= "P_text" > Text information </param>        ///<param name= "P_model" & gt; category </param>        ///<param name= "P_starchar" > Increase before and after * number </param>        ///<returns> graphics </returns>         public Bitmap getcodeimage (String p_text, Code39model P_model,BOOL P_starchar)         {            String _valuetext = "";             String _codetext = "";             char[] _valuechar = null;             switch (P_model)             {    &NBSP ;           Code39model.code39normal:                     _valuetext = P_text.toupper ();                     break;                 default:                 & nbsp   _valuechar = P_text.tochararray ();                     for (int i = 0; I!= _valuechar.length i++)                     {        &nbsp               if ((int) _valuechar[i] >= (int) _valuechar[i] <= 122)                         {          nbsp                 _valuetext = "+" + _valuechar[i]. ToString (). ToUpper ();                          }         & nbsp               else                   &NBSP ;     (                            _valuete XT + _valuechar[i]. ToString ();                                   & nbsp        }                     Break                           _valuechar = _valuetext.tocha Rarray ();               if (P_starchar = = true) _codetext + = m_code39["*"];               for (int i = 0; I!= _valuechar.length; i++)             {                if (P_starchar = = True && _valuechar[i] = = ' * ') throw new Exception ("with a starting sign cannot appear *");                   Object _charcode = M_code39[_valuechar[i]. ToString ()];                 if (_charcode = null) throw new Exception ("Unavailable characters" + _valuechar[i ]. ToString ());                 _codetext + + _charcode.tostring ();                           if (P_starchar = = True) _code Text + + m_code39["*"];               Bitmap _codebmp = GetImage (_codetext);             Getviewimage (_codebmp, P_text);             return _codebmp;        }              ///<summary>       &N Bsp Draw coded graphics        ///</summary>        ///<param name= "P_text" > Code & lt;/param>        ///<returns> graphics </returns>         Private Bitmap GetImage (string p_text)         {            char[] _value = p_text.to Chararray ();              //wide = = need to draw number * magnification + two words wide            &NBS P   Bitmap _codeimage = new Bitmap (_value.length * (int) m_magnify + 1), (int) m_height);           &NBsp Graphics _garphics = Graphics.fromimage (_codeimage);               _garphics.fillrectangle (Brushes.white, New Rectangle (0, 0, _codeimage.wi DTH, _codeimage.height));               int _lenex = 0;             for (int i = 0; I!= _value.length i++)           &NBS P {                int _drawwidth = m_magnify + 1;         &NBS P       if (_value[i] = ' 1 ')                 {                    _garphics.fillrectangle (Brushes.black, New Rectangle (_lenex, 0, _drawwid Th, m_height));                   {                E LSE                 {          &NBsp         _garphics.fillrectangle (Brushes.white, New Rectangle (_lenex, 0, _drawwidth, m_height));                                 _lenex + = _drawwidth;                               _GARPHICS.DISPO SE ();             return _codeimage;        }        ///<summary>        ///drawing text        ///</summary>        ///<param name= "P_codeimage" > Graphics </param&gt ;        ///<param name= "P_text" > Text </param>         private void GETVI Ewimage (Bitmap p_codeimage, string p_text)         {            if (m_v Iewfont = = null) return;             Graphics _graphics = Graphics.fromimage (p_codeimage);             SizeF _fontsize = _graphics.measurestring (P_text, M_viewfont);               if (_fontsize.width > P_codeimage.width | | _fontsize.height > P_COD eimage.height-20)             {                _G Raphics. Dispose ();                 return;                         int _starheight = P_codeimage.height -(int) _fontsize.height;               _graphics.fillrectangle (Brushes.white, New Rectangle (0, _starheight, P_c Odeimage.width, (int) _fontsize.height));               int _starwidth = (p_codeimage.width-(int) _fontsize.width)/2;               _graphics.drawstring (P_text, M_viewfont, Brushes.black, _starwidth, _starheight);               _graphics.dispose ();           {   }   {    code as follows: <%@ WebHandler language= "C # class=" Ge Tc39handler "%>   using System; Using System.Web; Using System.IO; Using System.Drawing; Using System.Drawing.Imaging;   public class Getc39handler:ihttphandler {   //Get Code39 handler     public void ProcessRequest ( HttpContext context) {        String OrderNo = context. request.params["OrderNo"];         MSCL. Code39 _code39 = new MSCL. Code39 ();         _code39.height = 60;         _code39.magnify = 0;         _code39.viewfont = new Font ("Arial", 12);         System.Drawing.Image _codeimage = _code39.getcodeimage (OrderNo, MSCL. Code39.Code39Model.Code39Normal, True);         SYSTEM.IO.MEmorystream _stream = new System.IO.MemoryStream ();         _codeimage.save (_stream, System.Drawing.Imaging.ImageFormat.Jpeg);        //_codeimage.save (Server.MapPath ("/1.jpeg"));        //_codeimage.save (Server.MapPath ("/1.bmp"));        //_codeimage.save (Server.MapPath ("/1.gif"));           context. Response.ContentType = "Image/tiff";         context. Response.Clear ();         context. Response.bufferoutput = true;         context. Response.BinaryWrite (_stream.getbuffer ());         context. Response.Flush ();    }         public bool IsReusable {        get {    &NBSP ;       return false;        }    }}     code as follows:        //Call Display order Barcode     &N Bsp   Image1.IMAGEURL = "Getc39handler.ashx?" orderno=32134411 ";