?<%
Call Com_CreatValidCode("ValidCode") 
Sub Com_CreatValidCode(pSN) 

Response.Expires = -9999 
Response.AddHeader "Pragma","no-cache" 
Response.AddHeader "cache-ctrol","no-cache" 
Response.ContentType = "Image/BMP" 

Randomize 

Dim i, ii, iii 

Const cOdds = 0 ' 雜點出現的機率 
Const cAmount = 10 ' 文字數量 
Const cCode = "0123456789" 

' 顏色的數據(字符，背景) 
Dim vColorData(1) 
vColorData(0) = ChrB(0) & ChrB(0) & ChrB(0) ' 藍0，綠0，紅0（黑色） 
vColorData(1) = ChrB(250) & ChrB(236) & ChrB(211) ' 藍250，綠236，紅211（淺藍色） 

' 隨機產生字符 
Dim vCode(4), vCodes 
For i = 0 To 3 
vCode(i) = Int(Rnd * cAmount) 
vCodes = vCodes & Mid(cCode, vCode(i) + 1, 1) 
Next 

Session(pSN) = vCodes '記錄入Session 

' 字符的數據 
Dim vNumberData(10) 
vNumberData(0) = "1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111110000111" 
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" 
vNumberData(10) = "1111011111111101111111101011111110101111111010111111101011111100000111110111011111011101111000100011" 

' 輸出圖像文件頭 
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) 

' 輸出圖像信息頭 
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 ' 歷經所有行 
For ii = 0 To 3 ' 歷經所有字 
For iii = 1 To 10 ' 歷經所有像素 
' 逐行、逐字、逐像素地輸出圖像數據 
If Rnd * 99 + 1 < cOdds Then ' 隨機生成雜點 
Response.BinaryWrite vColorData(0) 
Else 
Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1)) 
End If 
Next 
Next 
Next 
End Sub 
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