Code39生成条形码加星号的解决办法以及当扫描枪扫描不到条码的解决办法 | 您所在的位置:网站首页 › 扫码枪用不了怎么解决 › Code39生成条形码加星号的解决办法以及当扫描枪扫描不到条码的解决办法 |
这里还是引用一段别人的代码:
using System; using System.Collections; using System.ComponentModel; using System.Drawing; using System.Data;
namespace Top.Web.Loan { public class Code39DrowImage {
private Hashtable m_Code39 = new Hashtable(); private byte m_Magnify = 0; /// /// 放大倍数 /// public byte Magnify { get { return m_Magnify; } set { m_Magnify = value; } }
private int m_Height = 40; /// /// 图形高 /// public int Height { get { return m_Height; } set { m_Height = value; } }
private Font m_ViewFont = null; /// /// 字体大小 /// public Font ViewFont { get { return m_ViewFont; } set { m_ViewFont = value; } }
public Code39DrowImage() {
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("$", "1001001001010"); m_Code39.Add(".", "1100101011010"); m_Code39.Add(" ", "1001101011010"); }
public enum Code39Model { /// /// 基本类别 1234567890ABC /// Code39Normal, /// /// 全ASCII方式 +A+B 来表示小写 /// Code39FullAscII } /// /// 获得条码图形 /// /// 文字信息 /// 类别 /// 是否增加前后*号 /// 图形 public Bitmap GetCodeImage(string p_Text, Code39Model p_Model, bool p_StarChar) { string _ValueText = ""; string _CodeText = ""; char[] _ValueChar = null; switch (p_Model) { case Code39Model.Code39Normal: _ValueText = p_Text.ToUpper(); break; default: _ValueChar = p_Text.ToCharArray(); for (int i = 0; i != _ValueChar.Length; i++) { if ((int)_ValueChar[i] >= 97 && (int)_ValueChar[i] _ValueText += _ValueChar[i].ToString(); } } break; }
_ValueChar = _ValueText.ToCharArray(); if (p_StarChar == true) _CodeText += m_Code39["*"]; for (int i = 0; i != _ValueChar.Length; i++) { if (p_StarChar == true && _ValueChar[i] == '*') throw new Exception("带有起始符号不能出现*"); object _CharCode = m_Code39[_ValueChar[i].ToString()]; if (_CharCode == null) throw new Exception("不可用的字符" + _ValueChar[i].ToString()); _CodeText += _CharCode.ToString(); }
if (p_StarChar == true) _CodeText += m_Code39["*"];
Bitmap _CodeBmp = GetImage(_CodeText); GetViewImage(_CodeBmp, p_Text, p_StarChar); return _CodeBmp; }
/// /// 绘制编码图形 /// /// 编码 /// 图形 private Bitmap GetImage(string p_Text) { char[] _Value = p_Text.ToCharArray();
//宽 == 需要绘制的数量*放大倍数 + 两个字的宽 Bitmap _CodeImage = new Bitmap(_Value.Length * ((int)m_Magnify+1), (int)m_Height); Graphics _Garphics = Graphics.FromImage(_CodeImage); _Garphics.FillRectangle(Brushes.White, new Rectangle(0, 0, _CodeImage.Width, _CodeImage.Height));
int _LenEx = 0; for (int i = 0; i != _Value.Length; i++) { int _DrawWidth = m_Magnify + 1; if (_Value[i] == '1') { _Garphics.FillRectangle(Brushes.Black, new Rectangle(_LenEx, 0, _DrawWidth, m_Height)); } else { _Garphics.FillRectangle(Brushes.White, new Rectangle(_LenEx, 0, _DrawWidth, m_Height)); } _LenEx += _DrawWidth; }
_Garphics.Dispose(); return _CodeImage; } /// /// 绘制文字 /// /// 图形 /// 文字 private void GetViewImage(Bitmap p_CodeImage, string p_Text, bool p_StarChar) { //给文字加星号 string _p_Text = string.Empty; if (p_StarChar == true) { _p_Text = "*" + p_Text + "*"; }
if (m_ViewFont == 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_CodeImage.Height - 20) { _Graphics.Dispose(); return; } int _StarHeight = p_CodeImage.Height - (int)_FontSize.Height; _Graphics.FillRectangle(Brushes.White, new Rectangle(0, _StarHeight, p_CodeImage.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();
} }
}
这个方法GetViewImage()里面是给文字下标加星号的; 调用这个类的方法:
System.IO.MemoryStream ms; ms = new System.IO.MemoryStream(); Code39DrowImage c39; c39 = new Code39DrowImage(); c39.Height = 50; c39.Magnify = 0; c39.ViewFont = new System.Drawing.Font("Arial", 7); c39.GetCodeImage(code, Code39DrowImage.Code39Model.Code39Normal, showCodeString).Save(ms, System.Drawing.Imaging.ImageFormat.Png); //using (ms = new MemoryStream()) //{ //Bitmap bmp = null; if (File.Exists(ConfigurationSettings.AppSettings["BarCodeImg"] + code + ".png")) { //using (bmp = new Bitmap(ConfigurationSettings.AppSettings["BarCodeImg"] + code + ".png")) //{ // bmp.Save(ms, ImageFormat.Png); //} //}
//把图片保存到文件夹 if (code.Trim() != string.Empty) { Image img = Image.FromStream(ms); string imagePath = ConfigurationSettings.AppSettings["BarCodeImg"] + code + ".png"; img.Save(imagePath); }
扫描枪扫描不出条形码,也就是识别不了,一般是由于生成的条形码长度过长,可以通过控制字体大小来控制条形码的长度, c39.ViewFont = new System.Drawing.Font("Arial", 7);
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