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彩色验证码

ASP　2008/3/23 9:57:31　　点击：不统计

<%

Response.Buffer = True

Response.ExpiresAbsolute = Now() - 1

Response.Expires = 0

Response.cachecontrol = "no-cache"

Response.ContentType = "Image/Bmp"

Call Com_CreatValidCode()

Sub Com_CreatValidCode()

Randomize

Dim i, ii, iii

Const cAmount = 10 '数值个数

Const cCode = "0123456789" '数值范围

Dim vColorData(2)

vColorData(0) = "" '黑色点要转为彩色点,暂时不定义

vColorData(1) = ChrB(255) & ChrB(255) & ChrB(255) '白点

Dim vCode(4), vCodes '产生一组任意数

For i = 0 To 3

vCode(i) = Int(Rnd * cAmount) '数组等于总数*随机数

if i=1 then vCode(i)="11" '第二位为+

if i=3 then vCode(i)="10" '第四位为=

vCodes=vCodes&Mid(cCode,vCode(i)+1,1) '串等于串加上后续值

Next

session("checkcode")=int(Mid(vCodes,1,1)) + int(Mid(vCodes,2,1)) '计算相加和值并赋值给session

Dim vNumberData(36)

vNumberData(0) =

"1110000111110111101111011110111101111011110111101111011110111101111011110111101111011110111110000111"

vNumberData(1) =

"1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111100000111"

vNumberData(2) =

"1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111100000011"

vNumberData(3) =

"1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111110000111"

vNumberData(4) =

"1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111111000011"

vNumberData(5) =

"1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111110000111"

vNumberData(6) =

"1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111110000111"

vNumberData(7) =

"1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111111011111"

vNumberData(8) =

"1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111110000111"

vNumberData(9) =

"1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111110001111"

'表示=

vNumberData(10) =

"1111111111111111111111111111111000000001111111111111111111111000000001111111111111111111111111111111"

'表示+

vNumberData(11) =

"1111111111111100111111110011111111001111100000000110000000011111001111111100111111110011111111111111"

Response.BinaryWrite ChrB(66) & ChrB(77) & ChrB(230) & ChrB(4) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_

ChrB(0) & ChrB(0) & ChrB(54) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(40) & ChrB(0) &_

ChrB(0) & ChrB(0) & ChrB(40) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(10) & ChrB(0) &_

ChrB(0) & ChrB(0) & ChrB(1) & ChrB(0)

Response.BinaryWrite ChrB(24) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(176) & ChrB(4) &_

ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) &_

ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_

ChrB(0) & ChrB(0)

For i = 9 To 0 Step -1 '行

For ii = 0 To 3 '字数

For iii = 1 To 10 '像素点

if Mid(vNumberData(vCode(ii)), i * 10 + iii , 1) ="0" then '产生彩色点,减去一个固定值,可使颜色偏深

dim a,b,c

a=abs(Rnd * 256-60)

b=abs(Rnd * 256-128)

c=abs(Rnd * 256-60)

vColorData(0) = ChrB(a) & ChrB(b) & ChrB(c)

Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii , 1))

else

dim d,e,f '产生彩色背景，颜色偏浅，也可以随机生成噪点做背景

d=abs(Rnd * 255)

e=abs(Rnd * 255)

f=abs(Rnd * 255)

if d+e+f>640 then '可改值,调整背景色深

vColorData(1) = ChrB(d) & ChrB(e) & ChrB(f)

Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii , 1))

else

Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii , 1))

end if

end if

Next

Next

Next

End Sub

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