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ASP 生成 XBM 图可用作验证码

王朝asp·作者佚名  2006-12-16
窄屏简体版  字體: |||超大  

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"

%>

 
 
 
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