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VB生成条形码的几个方法
方法一：
public string bar_code(object str, int ch, int cw, int type_code)
{
//str:输入的字符串;ch:要显示条形码的高度;cw:要显示条形码的宽度;type_code:代码类型
string strTmp = str.ToString();
string code = strTmp;
// ToLower()将string转化成小写形式的副本，返回是使用指定区域的性的大小写规则。
strTmp = strTmp.ToLower();
int height = ch;
int width = cw;
//将传入的参数进行转化。
strTmp = strTmp.Replace("0", "_|_|__||_||_|"); ;
strTmp = strTmp.Replace("1", "_||_|__|_|_||");
strTmp = strTmp.Replace("2", "_|_||__|_|_||");
strTmp = strTmp.Replace("3", "_||_||__|_|_|");
strTmp = strTmp.Replace("4", "_|_|__||_|_||");
strTmp = strTmp.Replace("5", "_||_|__||_|_|");
strTmp = strTmp.Replace("7", "_|_|__|_||_||");
strTmp = strTmp.Replace("6", "_|_||__||_|_|");
strTmp = strTmp.Replace("8", "_||_|__|_||_|");
strTmp = strTmp.Replace("9", "_|_||__|_||_|");
strTmp = strTmp.Replace("a", "_||_|_|__|_||");
strTmp = strTmp.Replace("b", "_|_||_|__|_||");
strTmp = strTmp.Replace("c", "_||_||_|__|_|");
strTmp = strTmp.Replace("d", "_|_|_||__|_||");
strTmp = strTmp.Replace("e", "_||_|_||__|_|");
strTmp = strTmp.Replace("f", "_|_||_||__|_|");
strTmp = strTmp.Replace("g", "_|_|_|__||_||");
strTmp = strTmp.Replace("h", "_||_|_|__||_|");
strTmp = strTmp.Replace("i", "_|_||_|__||_|");
strTmp = strTmp.Replace("j", "_|_|_||__||_|");
strTmp = strTmp.Replace("k", "_||_|_|_|__||");
strTmp = strTmp.Replace("l", "_|_||_|_|__||");
strTmp = strTmp.Replace("m", "_||_||_|_|__|");
strTmp = strTmp.Replace("n", "_|_|_||_|__||");
strTmp = strTmp.Replace("o", "_||_|_||_|__|");
strTmp = strTmp.Replace("p", "_|_||_||_|__|");
strTmp = strTmp.Replace("r", "_||_|_|_||__|");
strTmp = strTmp.Replace("q", "_|_|_|_||__||");
strTmp = strTmp.Replace("s", "_|_||_|_||__|");
strTmp = strTmp.Replace("t", "_|_|_||_||__|");
strTmp = strTmp.Replace("u", "_||__|_|_|_||");
strTmp = strTmp.Replace("v", "_|__||_|_|_||");
strTmp = strTmp.Replace("w", "_||__||_|_|_|");
strTmp = strTmp.Replace("x", "_|__|_||_|_||");
strTmp = strTmp.Replace("y", "_||__|_||_|_|");
strTmp = strTmp.Replace("z", "_|__||_||_|_|");
strTmp = strTmp.Replace("-", "_|__|_|_||_||");
strTmp = strTmp.Replace("*", "_|__|_||_||_|");
strTmp = strTmp.Replace("/", "_|__|__|_|__|");
strTmp = strTmp.Replace("%", "_|_|__|__|__|");
strTmp = strTmp.Replace("+", "_|__|_|__|__|");
strTmp = strTmp.Replace(".", "_||__|_|_||_|");
strTmp = strTmp.Replace("_", "<span style='height:" + height + ";width:" + width + ";background:#FFFFFF;'></span>");
strTmp = strTmp.Replace("|", "<span style='height:" + height + ";width:" + width + ";background:#000000;'></span>");
if (type_code == 1)
{
return strTmp + "<BR>" + code;
}
else
{
return strTmp;
}
}
随机数：
private int GetRandomNum(int i, int length, int up, int down)
{
int iFirst = 0;
Random ro = new Random(i * length * unchecked((int)DateTime.Now.Ticks));
iFirst = ro.Next(up, down);
return iFirst;
}
方法二：
using System.Drawing;
public void CreateCodeLogo(string code)
{
long len = code.Length;
string lastString = "";
char[] list = new char[len + 1];
list = code.ToCharArray();
for (int i = 0; i < list.Length; i++)
{
lastString += this.ConvertToBinaryString(list[i].ToString());
}
char[] numList = new char[lastString.Length + 1];
numList = lastString.ToCharArray();
Bitmap image = new Bitmap(200, 140);
Graphics g = Graphics.FromImage(image);
g.Clear(Color.White);
Pen penBlack = new Pen(Color.FromArgb(255, 0, 0, 0), 2.5F);
Pen penWhite = new Pen(Color.White, 2.5F);
int j = 0;
for (float k = 10; j < numList.Length; k += 2F, j++)
{
if (numList[j].ToString() == "1")
{
g.DrawLine(penBlack, k, 10, k, 110);
}
else
{
g.DrawLine(penWhite, k, 10, k, 110);
}
if (j % 4 == 0)
{
g.DrawString(list[j / 4].ToString(), new System.Drawing.Font("Courier New", 12), new SolidBrush(Color.Red), k, 112);
}
}
image.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);
}
//将字符串数值转换为二进制字符串数值
public string ConvertToBinaryString(string buf)
{
int[] temp = new int[20];
string binary;
int val = 0, i = 0, j;
//先将字符转化为十进制数
try
{
val = Convert.ToInt32(buf);
}
catch
{
val = 0;
}
if (val == 0)
{
return ("0000");
}
i = 0;
while (val != 0)
{
temp[i++] = val % 2;
val /= 2;
}
binary = "";
for (j = 0; j <= i - 1; j++)
{
binary += (char)(temp[i - j - 1] + 48);
}
if (binary.Length < 4) //如果小于4位左边补零
{
int len = 4 - binary.Length;
string str = "";
while (len > 0)
{
str += "0";
len--;
}
binary = str + binary;
}
return (binary);
}
protected void Button1_Click(object sender, EventArgs e)
{
CreateCodeLogo(TextBox1.Text);
}
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