随机数字直接生成图片的ASP代码，可以做认证码。

以下是 xbm.asp 代码片段： <!--#include file="numcode.asp"--> <% 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 %>

以下是 numcode.asp 代码片段： <% 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" %>

引用时，和插入图片一样
<img src="xbm.asp">