ASP生成XBM图可用作验证码


这个程序主要是先生成一个随机数,然后根据生成的随机数经过变换后作为XBM图片的内容,最后显示这个图片. 验证时中要获取输入的数字和Session("validatecode")比较,如果相等则通过验证(还要注意一下相比较的两数据的类型保持一致)。

  如何显示生成的图片呢? <img src="xbm.asp"></img>

  关于XBM图的格式信息,看这里

  http://www.zdnet.com.cn/developer/tech/story/0,2000081602,39134972,00.htm

  xbm.asp的代码如下

  程序代码:

<!--#include file="numcode.asp"-->
<%
 '开启缓冲
Response.Buffer = True
With Response
.Expires = -1
.AddHeader "Pragma","no-cache"
.AddHeader "cache-ctrol","no-cache"
End With
Dim num
Randomize
num = Int(7999 * Rnd + 2000)
Session("validateCode") = num
Dim Image
Dim Width, Height
Dim digtal
Dim Length
Dim sort
Dim hc
Length = 4
hc = chr(13) & chr(10)
Redim sort(Length)
digital = ""
For I = 1 To Length - Len(num)
digital = digital & "0"
Next
For I = 1 To Len(num)
digital = digital & Mid(num, I, 1)
Next
For I = 1 To Len(digital)
sort(I) = Mid(digital, I, 1)
Next
Width = 8 * Len(digital)
Height = 10
Response.ContentType = "image/x-xbitmap"
Image = "#define counter_width " & Width & hc
Image = Image & "#define counter_height " & Height & hc
Image = Image & "static unsigned char counter_bits[] = {" & hc
For I = 1 To Height
For J = 1 To Length
 Image = Image & a(sort(J),I) & ","
Next
Next
Image = Left(Image, Len(Image) - 1)
Image = Image & "};" & hc
Response.Write Image
%>
Numcode.asp的代码如下:
程序代码:
<%
 Dim a(10,10)
 a(0,1) = "0x3c" '数字0
 a(0,2) = "0x66"
 a(0,3) = "0xc3"
 a(0,4) = "0xc3"
 a(0,5) = "0xc3"
 a(0,6) = "0xc3"
 a(0,7) = "0xc3"
 a(0,8) = "0xc3"
 a(0,9) = "0x66"
 a(0,10)= "0x3c"
 a(1,1) = "0x18" '数字1
 a(1,2) = "0x1c"
 a(1,3) = "0x18"
 a(1,4) = "0x18"
 a(1,5) = "0x18"
 a(1,6) = "0x18"
 a(1,7) = "0x18"
 a(1,8) = "0x18"
 a(1,9) = "0x18"
 a(0,10)= "0x7e"
 a(2,1) = "0x3c" '数字2
 a(2,2) = "0x66"
 a(2,3) = "0x60"
 a(2,4) = "0x60"
 a(2,5) = "0x30"
 a(2,6) = "0x18"
 a(2,7) = "0x0c"
 a(2,8) = "0x06"
 a(2,9) = "0x06"
 a(2,10)= "0x7e"
 a(3,1) = "0x3c" '数字3
 a(3,2) = "0x66"
 a(3,3) = "0xc0"
 a(3,4) = "0x60"
 a(3,5) = "0x1c"
 a(3,6) = "0x60"
 a(3,7) = "0xc0"
 a(3,8) = "0xc0"
 a(3,9) = "0x66"
 a(3,10)= "0x38"
 a(4,1) = "0x38" '数字4
 a(4,2) = "0x3c"
 a(4,3) = "0x36"
 a(4,4) = "0x33"
 a(4,5) = "0x33"
 a(4,6) = "0x33"
 a(4,7) = "0xff"
 a(4,8) = "0x30"
 a(4,9) = "0x30"
 a(4,10)= "0xfe"
 a(5,1) = "0xfe" '数字5
 a(5,2) = "0xfe"
 a(5,3) = "0x06"
 a(5,4) = "0x06"
 a(5,5) = "0x3e"
 a(5,6) = "0x60"
 a(5,7) = "0xc0"
 a(5,8) = "0xc3"
 a(5,9) = "0x66"
 a(5,10)= "0x3c"
 a(6,1) = "0x60" '数字6
 a(6,2) = "0x30"
 a(6,3) = "0x18"
 a(6,4) = "0x0c"
 a(6,5) = "0x3e"
 a(6,6) = "0x63"
 a(6,7) = "0xc3"
 a(6,8) = "0xc3"
 a(6,9) = "0x66"
 a(6,10) ="0x3c"
 a(7,1) = "0xff" '数字7
 a(7,2) = "0xc0"
 a(7,3) = "0x60"
 a(7,4) = "0x30"
 a(7,5) = "0x18"
 a(7,6) = "0x18"
 a(7,7) = "0x18"
 a(7,8) = "0x18"
 a(7,9) = "0x18"
 a(7,10)= "0x18"
 a(8,1) = "0x3c" '数字8
 a(8,2) = "0x66"
 a(8,3) = "0xc3"
 a(8,4) = "0x66"
 a(8,5) = "0x3c"
 a(8,6) = "0x66"
 a(8,7) = "0xc3"
 a(8,8) = "0xc3"
 a(8,9) = "0x66"
 a(8,10)= "0x3c"
 a(9,1) = "0x3c" '数字9
 a(9,2) = "0x66"
 a(9,3) = "0xc3"
 a(9,4) = "0xc3"
 a(9,5) = "0x66"
 a(9,6) = "0x3c"
 a(9,7) = "0x18"
 a(9,8) = "0x0c"
 a(9,9) = "0x06"
 a(9,10)= "0x03"
%>


« 
» 
快速导航

Copyright © 2016 phpStudy | 豫ICP备2021030365号-3