winform程序生成条形码并且并且保存到本地文件中。

　　今天公司让做一个输入数字、字母生成条形码并且可以以图片格式保存到本地。当看到这个需求时候感觉很搞笑，明明可以用文本框搞定的东西非得做个程序。哎，寄人篱下，不多说了，这就是养兵千日用兵一时。

　　我在网上找了很多资料，在最终得出的结论就是电脑必须安装有code39/code 128 字体。具体下载地址我就不说，网上很多。我们以code 128 为例开始操作。

　　首先我们创建一个winform工程，然后通过拖拽方式进行设计界面（第一次创建winform程序，不知道有没有人自己手敲界面，心好累）界面如下：

　　上下的控件就不解释了，中间我拖拽的是picturebox控件，这个控件用于显示生成的条形码。

　　代码部分，首先我先创建了一个类Code39，具体代码如下：

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
public sealed class Code39
{
    #region private variables
    /// <summary>
    /// The Space Between each of Title, BarCode, BarCodeString
    /// </summary>
    private const int SPACE_HEIGHT = 3;
    SizeF _sizeLabel = SizeF.Empty;
    SizeF _sizeBarCodeValue = SizeF.Empty;
    SizeF _sizeBarCodeString = SizeF.Empty;
    #endregion
    #region Label
    private string _label = null;
    private Font _labelFont = null;
    /// <summary>
    /// BarCode Title (条码标签)
    /// </summary>
    public string Label
    {
        set { _label = value; }
    }
    /// <summary>
    /// BarCode Title Font (条码标签使用的字体)
    /// </summary>
    public Font LabelFont
    {
        get
        {
            if (_labelFont == null)
                return new Font("Code 128", 10);
            return _labelFont;
        }
        set { _labelFont = value; }
    }
    #endregion
    private string _additionalInfo = null;
    private Font _addtionalInfoFont = null;
    /// <summary>
    /// Additional Info Font (附加信息字体)
    /// </summary>
    public Font AdditionalInfoFont
    {
        set { _addtionalInfoFont = value; }
        get
        {
            if (_addtionalInfoFont == null) return new Font("Code 128", 10);
            return _addtionalInfoFont;
        }
    }
    /// <summary>
    /// Additional Info Content, if "ShowBarCodeValue" is true, the info is unvisible
    /// 附加信息，如果设置ShowBarCodeValue为true,则此项不显示
    /// </summary>
    public string AdditionalInfo
    {
        set { _additionalInfo = value; }
    }
    #region BarCode Value and Font
    private string _barCodeValue = null;
    /// <summary>
    /// BarCode Value (条码值)
    /// </summary>
    public string BarCodeValue
    {
        get
        {
            if (string.IsNullOrEmpty(_barCodeValue))
                throw new NullReferenceException("这个条形码不能进行设置!");
            return _barCodeValue;
        }
        set { _barCodeValue = value.StartsWith("*") && value.EndsWith("*") ? value : "*" + value + "*"; }
    }
    private bool _showBarCodeValue = false;
    /// <summary>
    /// whether to show the original string of barcode value bellow the barcode
    /// 是否在条码下方显示条码值，默认为false
    /// </summary>
    public bool ShowBarCodeValue
    {
        set { _showBarCodeValue = value; }
    }
    private Font _barCodeValueFont = null;
    /// <summary>
    /// the font of the codestring to show
    /// 条码下方显示的条码值的字体
    /// </summary>
    public Font BarCodeValueFont
    {
        get
        {
            if (_barCodeValueFont == null)
                return new Font("Code 128", 50);
            return _barCodeValueFont;
        }
        set { _barCodeValueFont = value; }
    }
    private int _barCodeFontSize = 50;
    /// <summary>
    /// the font size of the barcode value to draw
    /// 条码绘制的大小，默认50
    /// </summary>
    public int BarCodeFontSzie
    {
        set { _barCodeFontSize = value; }
    }
    #endregion
    #region generate the barcode image
    private Bitmap BlankBackImage
    {
        get
        {
            int barCodeWidth = 0, barCodeHeight = 0;
            using (Bitmap bmp = new Bitmap(1, 1, PixelFormat.Format32bppArgb))
            {
                using (Graphics g = Graphics.FromImage(bmp))
                {
                    if (!string.IsNullOrEmpty(_label))
                    {
                        _sizeLabel = g.MeasureString(_label, LabelFont);
                        barCodeWidth = (int)_sizeLabel.Width;
                        barCodeHeight = (int)_sizeLabel.Height + SPACE_HEIGHT;
                    }
                    _sizeBarCodeValue = g.MeasureString(BarCodeValue, new Font("Free 3 of 9 Extended", _barCodeFontSize));
                    barCodeWidth = Math.Max(barCodeWidth, (int)_sizeBarCodeValue.Width);
                    barCodeHeight += (int)_sizeBarCodeValue.Height;
                    if (_showBarCodeValue)
                    {
                        _sizeBarCodeString = g.MeasureString(_barCodeValue, BarCodeValueFont);
                        barCodeWidth = Math.Max(barCodeWidth, (int)_sizeBarCodeString.Width);
                        barCodeHeight += (int)_sizeBarCodeString.Height + SPACE_HEIGHT;
                    }
                    //else
                    //{
                    // if (!string.IsNullOrEmpty(_additionalInfo))
                    // {
                    // _sizeAdditionalInfo = g.MeasureString(_additionalInfo, AdditionalInfoFont);
                    // barCodeWidth = Math.Max(barCodeWidth, (int)_sizeAdditionalInfo.Width);
                    // barCodeHeight += (int)_sizeAdditionalInfo.Height + SPACE_HEIGHT;
                    // }
                    //}
                }
            }
            return new Bitmap(barCodeWidth, barCodeHeight, PixelFormat.Format32bppArgb);
        }
    }
    #region 获取条形码的格式。
    /// <summary>
    /// 获取128B的条形码
    /// </summary>
    /// <param name="inputData"></param>
    public string GetCode128B(string inputData)
    {
        string result = "";
        int checksum = 104;
        for (int ii = 0; ii < inputData.Length; ii++)
        {
            if (inputData[ii] >= 32)
            {
                checksum += (inputData[ii] - 32) * (ii + 1);
            }
            else
            {
                checksum += (inputData[ii] + 64) * (ii + 1);
            }
        }
        checksum = checksum % 103;
        if (checksum < 95)
        {
            checksum += 32;
        }
        else
        {
            checksum += 100;
        }
        result = Convert.ToChar(204) + inputData.ToString() + Convert.ToChar(checksum) + Convert.ToChar(206);
        return result;

    }
    /// <summary>
    /// 获取128A 的条形码
    /// </summary>
    /// <param name="inputData"></param>
    /// <returns></returns>
    public string GetCode128A(string inputData)
    {
        string result = "";
        int checksum = 103;
        int j = 1;
        for (int ii = 0; ii < inputData.Length; ii++)
        {
            if (inputData[ii] >= 32)
            {
                checksum += (inputData[ii] - 32) * (ii + 1);
            }
            else
            {
                checksum += (inputData[ii] + 64) * (ii + 1);
            }
        }
        checksum = checksum % 103;
        if (checksum < 95)
        {
            checksum += 32;
        }
        else
        {
            checksum += 100;
        }
        result = Convert.ToChar(203) + inputData.ToString() + Convert.ToChar(checksum) + Convert.ToChar(206);
        return result;
    }
    /// <summary>
    /// 获取128C的条形码
    /// </summary>
    /// <param name="inputData"></param>
    /// <returns></returns>
    public static string GetCode128C(string inputData)
    {
        string result = "";
        int checksum = 105;
        int j = 1;
        for (int ii = 0; ii < inputData.Length; ii++)
        {
            if (ii % 2 == 0)
            {
                checksum += Convert.ToInt32(inputData.Substring(ii, 2)) * j;
                if (Convert.ToInt32(inputData.Substring(ii, 2)) < 95)
                {
                    result += Convert.ToChar(Convert.ToInt32(inputData.Substring(ii, 2)) + 32);
                }
                else
                {
                    result += Convert.ToChar(Convert.ToInt32(inputData.Substring(ii, 2)) + 100);
                }
                j++;
            }
            ii++;
        }
        checksum = checksum % 103;
        if (checksum < 95)
        {
            checksum += 32;
        }
        else
        {
            checksum += 100;
        }
        result = Convert.ToChar(205) + result + Convert.ToChar(checksum) + Convert.ToChar(206);
        return result;
    }

    #endregion

    /// <summary>
    /// Draw the barcode value to the blank back image and output it to the browser
    /// 绘制WebForm形式的条码
    /// </summary>
    /// <param name="ms">Recommand the "Response.OutputStream" 使用 Response.OutputStream</param>
    /// <param name="imageFormat">The Image format to the Browser 输出到浏览器到图片格式，建议GIF</param>
    public Bitmap CreateWebForm(Stream ms, ImageFormat imageFormat)
    {
        int barCodeWidth, barCodeHeight;
        using (Bitmap bmp = this.BlankBackImage)
        {
            barCodeHeight = bmp.Height;
            barCodeWidth = bmp.Width;
            using (Graphics g = Graphics.FromImage(bmp))
            {
                g.Clear(Color.White);
                g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                int vPos = 0;
                ////Draw Label String
                if (!string.IsNullOrEmpty(_label))
                {
                    g.DrawString(_label, LabelFont, new SolidBrush(Color.Black),
                    XCenter((int)_sizeLabel.Width, barCodeWidth), vPos);
                    vPos += (int)_sizeLabel.Height + SPACE_HEIGHT;
                }
                else { vPos = SPACE_HEIGHT; }
                ////Draw The Bar Value
                g.DrawString(_barCodeValue, new Font("Free 3 of 9 Extended", _barCodeFontSize), new SolidBrush(Color.Black),
                XCenter((int)_sizeBarCodeValue.Width, barCodeWidth), vPos);
                ////Draw the BarValue String
                if (_showBarCodeValue)
                {
                    g.DrawString(_barCodeValue, BarCodeValueFont, new SolidBrush(Color.Black),
                    XCenter((int)_sizeBarCodeString.Width, barCodeWidth),
                    vPos + (int)_sizeBarCodeValue.Height);
                }
                //else
                //{
                // if (!string.IsNullOrEmpty(_additionalInfo))
                // {
                // g.DrawString(_additionalInfo, AdditionalInfoFont, new SolidBrush(Color.Black),
                // XCenter((int)_sizeAdditionalInfo.Width, barCodeWidth),
                // vPos + (int)_sizeBarCodeValue.Height);
                // }
                //}
            }
            bmp.Save(ms, imageFormat);
            return bmp;
        }
    }
    /// <summary>
    /// 生成winform格式的条码
    /// </summary>
    /// <param name="imageFormat">图片格式，建议GIF</param>
    /// <returns>Stream类型</returns>
    public Stream CreateWinForm(ImageFormat imageFormat)
    {
        int barCodeWidth, barCodeHeight;
        using (Bitmap bmp = this.BlankBackImage)
        {
            barCodeHeight = bmp.Height;
            barCodeWidth = bmp.Width;
            using (Graphics g = Graphics.FromImage(bmp))
            {
                g.Clear(Color.White);
                g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                int vPos = 0;
                ////Draw Label String
                if (!string.IsNullOrEmpty(_label))
                {
                    g.DrawString(_label, LabelFont, new SolidBrush(Color.Black),
                    XCenter((int)_sizeLabel.Width, barCodeWidth), vPos);
                    vPos += (int)_sizeLabel.Height + SPACE_HEIGHT;
                }
                else { vPos = SPACE_HEIGHT; }
                ////Draw The Bar Value
                g.DrawString(_barCodeValue, new Font("Free 3 of 9 Extended", _barCodeFontSize), new SolidBrush(Color.Black),
                XCenter((int)_sizeBarCodeValue.Width, barCodeWidth), vPos);
                ////Draw the BarValue String
                if (_showBarCodeValue)
                {
                    g.DrawString(_barCodeValue, BarCodeValueFont, new SolidBrush(Color.Black),
                    XCenter((int)_sizeBarCodeString.Width, barCodeWidth),
                    vPos + (int)_sizeBarCodeValue.Height);
                }
                //else
                //{
                // //if (!string.IsNullOrEmpty(_additionalInfo))
                // //{
                // // g.DrawString(_additionalInfo, AdditionalInfoFont, new SolidBrush(Color.Black),
                // // //XCenter((int)_sizeAdditionalInfo.Width, barCodeWidth),
                // // vPos + (int)_sizeBarCodeValue.Height);
                // //}
                //}
            }
            Stream ms = new MemoryStream();
            bmp.Save(ms, imageFormat);
            return ms;
        }
    }
    #endregion
    private static int XCenter(int subWidth, int globalWidth)
    {
        return (globalWidth - subWidth) / 2;
    }
}

#endregion

　　这是从网上找的一段代码，感觉挺高大上，而且比我之前写的简易的调整起来方便  简易代码也张贴一下，但是我不建议用它，因为个人感觉不方便没上边的那段代码好用，因为上边的还可以在web段进行调用，专门有web段调用的方法。我写的这个可以直接在程序中使用，不需要重新创建类。

Bitmap b=new Bitmap(200,200); 
 Graphics g = Graphics.FromImage(b); 
 Font font = new Font("Code39AzaleaRegular2", 32); 
 g.DrawString("123456", font, Brushes.Black, new PointF(100,100));  
 pictureBox1.BackgroundImage = b;
 pictureBox1.BackgroundImageLayout = ImageLayout.Zoom

　　对了说到web端调用生成条形码方法，顺便张贴一下web调用的方法:

// 新建一个.aspx文件
protected void Page_Load(object sender, EventArgs e) 
{ 
Code39 code39 = new Code39(); 
code39.BarCodeValue = "LDSO-001"; 
code39.BarCodeFontSzie = 60; 
// code39.Label = "39码，底部显示码值"; 
code39.ShowBarCodeValue = true; 
Response.Write(code39.CreateWebForm(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif)); 
code39 = null; 
} 

　　生成条形码按钮的click事件代码如下：

 　　　　　　// 获取文本框内容
       string barCode = tb_barcode.Text;

　　　　　　　Code39 code39 = new Code39();

            barCode = code39.GetCode128B(barCode);

            code39.BarCodeValue = barCode;

            code39.BarCodeFontSzie = 10;

            // code39.Label = barCode;
            code39.ShowBarCodeValue = true;
            // 将生成的条形码存放到picturebox控件的image中
            pic_show.Image = Image.FromStream(code39.CreateWinForm(System.Drawing.Imaging.ImageFormat.Gif));

　　此时当我们运行程序，并输入正规生成条形码的字段（具体要求请参考度娘所说的），点击生成条形码按钮（之前图片是确定按钮，怕误导大家所以就在粘贴图片时候又更改了名字）时候我们就可以看到这样的情形，如图所示：

　　看到这一步的时候我就觉得很叼了，然后就是保存图片功能了，保存图片时候就是大神们常常强调的要注重客户体验，所以我们需要让图片保存时候可以让用户进行选择存放位置，代码如下：

 if (pic_show.Image != null)
            {
                // 点击保存时候弹出本地窗口进行图片保存

                SaveFileDialog sfd = new SaveFileDialog();
                // 设置文件数据类型
                sfd.Filter = "数据保存文件（*.jpg）|*.jpg|数据保存文件（*.png）|*.png|数据保存文件（*.bmp）|*.bmp";
                // 设置默认文件类型顺序
                sfd.FilterIndex = 1;

                // 保存对话框是否记忆上一次打开的路径
                sfd.RestoreDirectory = true;
                // 
                if (sfd.ShowDialog() == DialogResult.OK)
                {
                    string localFilePath = sfd.FileName.ToString(); //获得文件路径

                    string fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("//") + 1); //获取文件名，不带路径
                    
                    Bitmap bmp = new Bitmap(pic_show.Image);
                    // 保存文件到指定流
                    bmp.Save(localFilePath);
                     

                }
            }

　　相信上边的代码基本上不用有过多的解释，已经那么多注释了，另外我真心需要强调一下注释，哎。。。被这家新公司弄的心好累，那么大的项目里边居然只有寥寥无几的注释，而且写这个项目的大神已经离职了。。。心中策马奔腾。。。。直接上图，