我正在开发一个项目，我希望根据用户ID生成条形码。我需要一个可以生成条形码并且也是加密的代码。我找到了一些代码，但它们似乎没什么帮助。提前感谢您的帮助。我试过这段代码，但它没有提供条形码图像。
`private void Page_Load(object sender, System.EventArgs e)
{
// Get the Requested code to be created.
string Code = Request["code"].ToString();
// Multiply the lenght of the code by 40 (just to have enough width)
int w = Code.Length * 40;
// Create a bitmap object of the width that we calculated and height of 100
Bitmap oBitmap = new Bitmap(w,100);
// then create a Graphic object for the bitmap we just created.
Graphics oGraphics = Graphics.FromImage(oBitmap);
// Now create a Font object for the Barcode Font
// (in this case the IDAutomationHC39M) of 18 point size
Font oFont = new Font("IDAutomationHC39M", 18);
// Let's create the Point and Brushes for the barcode
PointF oPoint = new PointF(2f, 2f);
SolidBrush oBrushWrite = new SolidBrush(Color.Black);
SolidBrush oBrush = new SolidBrush(Color.White);
// Now lets create the actual barcode image
// with a rectangle filled with white color
oGraphics.FillRectangle(oBrush, 0, 0, w, 100);
// We have to put prefix and sufix of an asterisk (*),
// in order to be a valid barcode
oGraphics.DrawString("*" + Code + "*", oFont, oBrushWrite, oPoint);
// Then we send the Graphics with the actual barcode
Response.ContentType = "image/jpeg" ;
oBitmap.Save (Response.OutputStream, ImageFormat.Jpeg);
}`
答案 0 :(得分：1)
查看this link这是一个简单的代码39条形码显示，支持页眉和页脚，打印，保存，并且可以很好地自定义。对于加密部分，您必须先将邮件加密，然后再将其转换为条形码。
从链接。
使用代码代码使用非常简单，只需控制即可 在表单上，您已准备好开始通过它自定义它 属性窗口或通过您的代码。除了 物业，还有两个感兴趣的公共职能：公共 void Print（）此函数将显示打印对话框然后打印 控件的内容到选定的打印机。公共无效 SaveImage（string filename）这个函数将保存的内容 控制到由filename指定的位图图像。
http://www.codeproject.com/Articles/10344/Barcode-NET-Control
答案 1 :(得分：0)
请尝试使用以下代码，您必须在代码中添加＆＃34; FREE3OF9.TTF＆＃34; 字体文件
Default.aspx.cs代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Text;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
////GenerateBarCode.GenerateBarCodes("dfdfdf", Label1);
GenerateBarCode();
}
}
private void GenerateBarCode()
{
WSBarcodeGenerator.BarCodeGenerator barCodeGen = new WSBarcodeGenerator.BarCodeGenerator();
int barSize = 30;
System.Byte[] imgBarcode =Code39("123456", barSize, true, "Centralbiz...");
MemoryStream memStream = new MemoryStream(imgBarcode);
Bitmap bitmap = new Bitmap(memStream);
bitmap.Save(memStream, ImageFormat.Png);
var base64Data = Convert.ToBase64String(memStream.ToArray());
imgBar.Attributes.Add("src", "data:image/png;base64," + base64Data);
//Response.Write(bitmap);
//var base64Data = Convert.ToBase64String(memStream.ToArray());
//imgBar.Attributes.Add("src", "png");
}
public byte[] Code39(string code, int barSize, bool showCodeString, string title)
{
Code39 c39 = new Code39();
// Create stream....
MemoryStream ms = new MemoryStream();
c39.FontFamilyName = "Free 3 of 9";
c39.FontFileName = Server.MapPath("FREE3OF9.TTF");
c39.FontSize = barSize;
c39.ShowCodeString = showCodeString;
if (title + "" != "")
c39.Title = title;
Bitmap objBitmap = c39.GenerateBarcode(code);
objBitmap.Save(ms, ImageFormat.Png);
//return bytes....
return ms.GetBuffer();
}
}
public class Code39
{
private const int _itemSepHeight = 3;
SizeF _titleSize = SizeF.Empty;
SizeF _barCodeSize = SizeF.Empty;
SizeF _codeStringSize = SizeF.Empty;
#region Barcode Title
private string _titleString = null;
private Font _titleFont = null;
public string Title
{
get { return _titleString; }
set { _titleString = value; }
}
public Font TitleFont
{
get { return _titleFont; }
set { _titleFont = value; }
}
#endregion
#region Barcode code string
private bool _showCodeString = false;
private Font _codeStringFont = null;
public bool ShowCodeString
{
get { return _showCodeString; }
set { _showCodeString = value; }
}
public Font CodeStringFont
{
get { return _codeStringFont; }
set { _codeStringFont = value; }
}
#endregion
#region Barcode Font
private Font _c39Font = null;
private float _c39FontSize = 12;
private string _c39FontFileName = null;
private string _c39FontFamilyName = null;
public string FontFileName
{
get { return _c39FontFileName; }
set { _c39FontFileName = value; }
}
public string FontFamilyName
{
get { return _c39FontFamilyName; }
set { _c39FontFamilyName = value; }
}
public float FontSize
{
get { return _c39FontSize; }
set { _c39FontSize = value; }
}
private Font Code39Font
{
get
{
if (_c39Font == null)
{
PrivateFontCollection pfc = new PrivateFontCollection();
pfc.AddFontFile(_c39FontFileName);
FontFamily family = new FontFamily(_c39FontFamilyName, pfc);
_c39Font = new Font(family, _c39FontSize);
}
return _c39Font;
}
}
#endregion
public Code39()
{
_titleFont = new Font("Arial", 10);
_codeStringFont = new Font("Arial", 10);
}
#region Barcode Generation
public Bitmap GenerateBarcode(string barCode)
{
int bcodeWidth = 0;
int bcodeHeight = 0;
// Get the image container...
Bitmap bcodeBitmap = CreateImageContainer(barCode, ref bcodeWidth, ref bcodeHeight);
Graphics objGraphics = Graphics.FromImage(bcodeBitmap);
// Fill the background
objGraphics.FillRectangle(new SolidBrush(Color.White), new Rectangle(0, 0, bcodeWidth, bcodeHeight));
int vpos = 0;
// Draw the title string
if (_titleString != null)
{
objGraphics.DrawString(_titleString, _titleFont, new SolidBrush(Color.Black), XCentered((int)_titleSize.Width, bcodeWidth), vpos);
vpos += (((int)_titleSize.Height) + _itemSepHeight);
}
// Draw the barcode
objGraphics.DrawString(barCode, Code39Font, new SolidBrush(Color.Black), XCentered((int)_barCodeSize.Width, bcodeWidth), vpos);
// Draw the barcode string
if (_showCodeString)
{
vpos += (((int)_barCodeSize.Height));
objGraphics.DrawString(barCode, _codeStringFont, new SolidBrush(Color.Black), XCentered((int)_codeStringSize.Width, bcodeWidth), vpos);
}
// return the image...
return bcodeBitmap;
}
private Bitmap CreateImageContainer(string barCode, ref int bcodeWidth, ref int bcodeHeight)
{
Graphics objGraphics;
// Create a temporary bitmap...
Bitmap tmpBitmap = new Bitmap(1, 1, PixelFormat.Format32bppArgb);
objGraphics = Graphics.FromImage(tmpBitmap);
// calculate size of the barcode items...
if (_titleString != null)
{
_titleSize = objGraphics.MeasureString(_titleString, _titleFont);
bcodeWidth = (int)_titleSize.Width;
bcodeHeight = (int)_titleSize.Height + _itemSepHeight;
}
_barCodeSize = objGraphics.MeasureString(barCode, Code39Font);
bcodeWidth = Max(bcodeWidth, (int)_barCodeSize.Width);
bcodeHeight += (int)_barCodeSize.Height;
if (_showCodeString)
{
_codeStringSize = objGraphics.MeasureString(barCode, _codeStringFont);
bcodeWidth = Max(bcodeWidth, (int)_codeStringSize.Width);
bcodeHeight += (_itemSepHeight + (int)_codeStringSize.Height);
}
// dispose temporary objects...
objGraphics.Dispose();
tmpBitmap.Dispose();
return (new Bitmap(bcodeWidth, bcodeHeight, PixelFormat.Format32bppArgb));
}
#endregion
#region Auxiliary Methods
private int Max(int v1, int v2)
{
return (v1 > v2 ? v1 : v2);
}
private int XCentered(int localWidth, int globalWidth)
{
return ((globalWidth - localWidth) / 2);
}
#endregion
}
Default.aspx代码
<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<h2>
Welcome to ASP.NET!
</h2>
<p>
To learn more about ASP.NET visit <a href="http://www.asp.net" title="ASP.NET Website">www.asp.net</a>.
</p>
<p>
You can also find <a href="http://go.microsoft.com/fwlink/?LinkID=152368&clcid=0x409"
title="MSDN ASP.NET Docs">documentation on ASP.NET at MSDN</a>.
</p>
<asp:Image ID="imgBar" runat="server" />
</asp:Content>