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一个用asp生成条形码的例子代码。(注意：生成的图形为html代码,而非图片，打印时，请在ie的internet选项=>高级＝》打印 选定“打印背景颜色和图像”)
演示地址：http://www.51windows.net/myfile/asp/codeflag.asp
更简单的方法就是使用条形码字体，下载：http://www.51windows.net/2004/share/font/tiaoma.rar（如果地址无法下载，请在google上搜索"条形码 字体"）。
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<meta name="keywords" content="51windows.net">
<meta name="author" content="haiwa">
<title>asp生成系形码</title>
<style>
<!–
* {font:menu}
–>
</style>
</head>
<body>
<%
条形码生成程序
海娃@2004-4-4
http://www.51windows.net
function haiwaocde(zfstr)
zf = zfstr
zf = replace(zf,"0","_|_|__||_||_|")
zf = replace(zf,"1","_||_|__|_|_||")
zf = replace(zf,"2","_|_||__|_|_||")
zf = replace(zf,"3","_||_||__|_|_|")
zf = replace(zf,"4","_|_|__||_|_||")
zf = replace(zf,"5","_||_|__||_|_|")
zf = replace(zf,"7","_|_|__|_||_||")
zf = replace(zf,"6","_|_||__||_|_|")
zf = replace(zf,"8","_||_|__|_||_|")
zf = replace(zf,"9","_|_||__|_||_|")
zf = replace(zf,"a","_||_|_|__|_||")
zf = replace(zf,"b","_|_||_|__|_||")
zf = replace(zf,"c","_||_||_|__|_|")
zf = replace(zf,"d","_|_|_||__|_||")
zf = replace(zf,"e","_||_|_||__|_|")
zf = replace(zf,"f","_|_||_||__|_|")
zf = replace(zf,"g","_|_|_|__||_||")
zf = replace(zf,"h","_||_|_|__||_|")
zf = replace(zf,"i","_|_||_|__||_|")
zf = replace(zf,"j","_|_|_||__||_|")
zf = replace(zf,"k","_||_|_|_|__||")
zf = replace(zf,"l","_|_||_|_|__||")
zf = replace(zf,"m","_||_||_|_|__|")
zf = replace(zf,"n","_|_|_||_|__||")
zf = replace(zf,"o","_||_|_||_|__|")
zf = replace(zf,"p","_|_||_||_|__|")
zf = replace(zf,"r","_||_|_|_||__|")
zf = replace(zf,"q","_|_|_|_||__||")
zf = replace(zf,"s","_|_||_|_||__|")
zf = replace(zf,"t","_|_|_||_||__|")
zf = replace(zf,"u","_||__|_|_|_||")
zf = replace(zf,"v","_|__||_|_|_||")
zf = replace(zf,"w","_||__||_|_|_|")
zf = replace(zf,"x","_|__|_||_|_||")
zf = replace(zf,"y","_||__|_||_|_|")
zf = replace(zf,"z","_|__||_||_|_|")
zf = replace(zf,"-","_|__|_|_||_||")
zf = replace(zf,"*","_|__|_||_||_|")
zf = replace(zf,"/","_|__|__|_|__|")
zf = replace(zf,"%","_|_|__|__|__|")
zf = replace(zf,"+","_|__|_|__|__|")
zf = replace(zf,".","_||__|_|_||_|")
haiwaocde = zf
end function
code_h = 52
code_w = 2
function dragcode(ccode)
c = ccode
c = replace(c,"_","<span style=height:"&code_h&";width:"&code_w&";background:#ffffff></span>")
c = replace(c,"|","<span style=height:"&code_h&";width:"&code_w&";background:#000000></span>")
dragcode = c
end function
function dragtext(ccode)
c = ccode
dragtext = ""
for i=1 to len(c)
dragtext = dragtext&"<span style=width:26;text-align:center>"&mid(c,i,1)&"</span>"
next
dragtext = dragtext
end function
function checkexp(patrn,str)
set regex=new regexp
regex.pattern=patrn
regex.ignorecase=true
regex.global=true
checkexp = regex.test(str)
end function
code = request("c")
if code = "" then
code = "*51windows.net*"
else
if checkexp("^[abcdefghijklmnopqrstuvwxyz1234567890\+\-\*\/\%\$\.]*$",code) then
code = "*"&code&"*"
else
code = "*51windows.net*"
errstr = "<br><center style=color:red;>含有非法字符 </center>"
end if
end if
ocode = code
code = lcase(code)
%>
<center><form name="form1" method="post">合法字符：abcdefghijklmnopqrstuvwxyz 1234567890 + – * / % $ .<br><br><input name="c" type="text" value="<%=request("c")%>" size="25" maxlength="15"> <input type="submit" name="submit" value="提交"></form><center>
<div align="center">
<center>
<table border="0" cellpadding="0" cellspacing="0" height="79">
<tr>
<td height="61" align="center"><%=dragcode(haiwaocde(code))%></td>
</tr>
<tr>
<td height="18" align="center" style="text-align:justify;text-justify:distribute-all-lines;"><%=(ocode)%></td>
</tr>
</table>
</center>
</div>
<%=errstr%>
</body>
</html>
