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記得“想當年”某天上午在這里路過(guò)，看到一位朋友貼的自己寫(xiě)的驗證碼程序，雖然他的程序是黑白有雜點(diǎn)，但其實(shí)很容易被破解的，但卻有不少人喜歡著(zhù)。。。沒(méi)辦法，當天下午研究了一翻 BMP 圖片，然后就寫(xiě)出了這些代碼，只是當初沒(méi)有公布，眼看今天這么多壞人亂在很多論壇上注冊用戶(hù)來(lái)發(fā)廣告，所以才貼出來(lái)共享一下。

本驗證碼生成程序特點(diǎn)如下：

一、彩色；

二、BMP 圖像色深為 16 位，生成的圖片體積更??；(4位長(cháng)的驗證碼只有幾百字節)

三、長(cháng)度可自定義；(1位至25位可固定設置，也可以自己改成動(dòng)態(tài))

四、背景雜色深度可自定義；

具體請看代碼

注：代碼中并沒(méi)有針對動(dòng)網(wǎng)的 設置驗證碼 Session 的地方。想用的朋友自己根據需要改一下，位置就在代碼中出現  Session("Num") 的那一行，改成自己需要的名稱(chēng)就可以了。這個(gè)驗證碼也可以用在任何需要驗證碼的地方。不用在動(dòng)網(wǎng)論壇也可。

下面是代碼部分：

<--r>Option Explicit
Response.Expires = 0
Response.AddHeader "Pragma","no-cache"
Response.AddHeader "cache-ctrol","no-cache"
Response.ContentType = "Image/BMP"
Randomize Timer

Dim Text_Data(9),Text_Len,Int_Temp(),I,j,k,Int_Temp2

‘‘***** 參數配置區 *****

Text_Len = 4 ‘‘驗證碼長(cháng)度(支持1-25位)

‘‘**********************

ReDim Int_Temp( Text_Len - 1 )

Text_Data(0)  = "00000000000001111000001100110000110111000011011100001100110000111011000011101100001100110000011110000000000000"
Text_Data(1)  = "00000000000000011000000011100000111110000000011000000001100000000110000000011000000001100000000110000000000000"
Text_Data(2)  = "00000000000001111000001100110000110011000000001100000001100000001100000001100000001100000000111111000000000000"
Text_Data(3)  = "00000000000001111000001100110000110011000000001100000011100000000011000011001100001100110000011110000000000000"
Text_Data(4)  = "00000000000001100000000110000000011011000001101100000110110000110011000011111110000000110000000011000000000000"
Text_Data(5)  = "00000000000011111100001100000000110000000011000000001111100000000011000000001100000001100000111100000000000000"
Text_Data(6)  = "00000000000000111000000011000000011000000011111000001100110000110011000011001100001100110000011110000000000000"
Text_Data(7)  = "00000000000011111100000000110000000110000000011000000011000000001100000001100000000110000000011000000000000000"
Text_Data(8)  = "00000000000001111000001100110000110011000011101100000111100000110111000011001100001100110000011110000000000000"
Text_Data(9)  = "00000000000001111000001100110000110011000011001100001100110000011111000000011000000011000000011100000000000000"

‘‘下面隨機生成各位驗證碼
Session("Num") = ""
For I = 0 To Text_Len - 1
   Int_Temp(I) = Int(Rnd * 10)
   Session("Num") = Session("Num") + Mid("0123456789",Int_Temp(I)+1,1)
Next

‘‘下面輸出文件頭部分
Int_Temp2 = (Text_Len - 1) \ 4 * 220 + ((Text_Len - 1) / 4 - (Text_Len - 1) \ 4 * 4) * 44
Response.BinaryWrite ChrB(&H42) & ChrB(&H4D)
Response.BinaryWrite ChrB(((Int_Temp2 + 206) / 256 - (Int_Temp2 + 206) \ 256) * 256) & ChrB((Int_Temp2 + 206) \ 256)   ‘‘特殊位
Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H76) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H28) & ChrB(0) & ChrB(0) & ChrB(0)
Response.BinaryWrite ChrB(Text_Len * 10)   ‘‘特殊位
Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&HB) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H1) & ChrB(0) & ChrB(&H4) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0)
Response.BinaryWrite ChrB(((Int_Temp2 + 88) / 256 - (Int_Temp2 + 88) \ 256) * 256) & ChrB((Int_Temp2 + 88) \ 256)   ‘‘特殊位

Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(16) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(16) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H80) & ChrB(0) & ChrB(0) & ChrB(&H80) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H80) & ChrB(&H80) & ChrB(0) & ChrB(&H80) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H80) & ChrB(0) & ChrB(&H80) & ChrB(0)
Response.BinaryWrite ChrB(&H80) & ChrB(&H80) & ChrB(0) & ChrB(0) & ChrB(&H80) & ChrB(&H80) & ChrB(&H80) & ChrB(0) & ChrB(&HC0) & ChrB(&HC0) & ChrB(&HC0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&HFF) & ChrB(0) & ChrB(0) & ChrB(&HFF) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&HFF) & ChrB(&HFF) & ChrB(0) & ChrB(&HFF) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&HFF) & ChrB(0) & ChrB(&HFF) & ChrB(0) & ChrB(&HFF) & ChrB(&HFF) & ChrB(0) & ChrB(0) & ChrB(&HFF) & ChrB(&HFF) & ChrB(&HFF) & ChrB(0)

‘‘下面輸出圖片數據
For i = 10 to 0 Step -1
   For j = 0 to Text_Len - 1
      For k = 1 to 9 Step 2
         If Mid(Text_Data(Int_Temp(j)) ,  i * 10 + k , 1) = "0" Then Int_Temp2 = Get_BackColor() * 16 Else Int_Temp2 = Get_ForeColor() * 16
         If Mid(Text_Data(Int_Temp(j)) ,  i * 10 + k + 1 , 1) = "0" Then Int_Temp2 = Int_Temp2 + Get_BackColor() Else Int_Temp2 = Int_Temp2 + Get_ForeColor()
         Response.BinaryWrite ChrB(Int_Temp2)
      Next
   Next
   Int_Temp2 = (Text_Len / 4 - Text_Len \ 4) * 4
   Select Case Int_Temp2
   Case 1
      Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0)
   Case 2
      Response.BinaryWrite ChrB(0) & ChrB(0)
   Case 3
      Response.BinaryWrite ChrB(0)
   End Select
Next

Function Get_BackColor()
‘‘得到一個(gè)背景色
If Int(Rnd * 30) = 0 Then ‘‘注：此處的 Rnd * 30 是決定背景雜色的多少，值越大，則雜色越少，圖片越容易看清楚
   Get_BackColor = CInt(Mid("00021209",Int(Rnd * 4) * 2 + 1,2))
Else
   Get_BackColor = CInt(Mid("081515151515",Int(Rnd * 6) * 2 + 1,2))
End If
End Function

Function Get_ForeColor()
‘‘得到一個(gè)前景色
Get_ForeColor = CInt(Mid("00021209",Int(Rnd * 4) * 2 + 1,2))
End Function