使用vbs识别验证码方案

本文给出了一种验证码识别方案，前提是咱们要有生成验证码的二进制码。

一、获取验证码图片

咱们要识别的图片文件：

将以上图片保存到本地，并命名为：1.jpg

二、vbs源码

识别该图片的vbs源码以下：

Option Explicit

'要识别的图片名称
Dim picName
picName = "1.jpg"

'数字对照表，识别图片时就是把从图片提取的与该数组比较，相同的即是该数字
Dim NumAry(9)
NumAry(0)="00011000001111000110011011000011110000111100001111000011011001100011110000011000"
NumAry(1)="00011000001110000111100000011000000110000001100000011000000110000001100001111110"
NumAry(2)="00111100011001101100001100000011000001100000110000011000001100000110000011111111"
NumAry(3)="01111100110001100000001100000110000111000000011000000011000000111100011001111100"
NumAry(4)="00000110000011100001111000110110011001101100011011111111000001100000011000000110"
NumAry(5)="11111110110000001100000011011100111001100000001100000011110000110110011000111100"
NumAry(6)="00111100011001101100001011000000110111001110011011000011110000110110011000111100"
NumAry(7)="11111111000000110000001100000110000011000001100000110000011000001100000011000000"
NumAry(8)="00111100011001101100001101100110001111000110011011000011110000110110011000111100"
NumAry(9)="00111100011001101100001111000011011001110011101100000011010000110110011000111100"

Dim st,dataOff,imgW,imgH,imgWBytes,unitW,unitH
Set st = Wscript.createobject("ADODB.Stream")
st.Type = 1
st.Mode = 3
st.open()
'加载图片二进制流，并读取图片头信息
st.LoadFromFile(picName)
st.position = 10
'获取数据偏移
dataOff = BinVal(st.read(4))
st.read(4)
'图片宽、高（象素）
imgW = BinVal(st.read(4))
imgH = BinVal(st.read(4))
imgWBytes = imgW
'每一个数字的宽、高（象素）
unitW = 8
unitH = 10

MsgBox st.LoadFromFile(picName)
MsgBox dataOff
MsgBox imgW&vbCrLf&imgH

Dim i,ii,tmp,validCode
'循环获取五个数字
For i=0 To 4
'获取某数字的特征，并与对照表进行比较，找到对应的则记录，不然以*号标识
'3188是第一个数字的左上角的数据偏移，每向后一个则偏移增长 unitW+1
tmp = getBound(3188+(unitW+1)*i)
For ii=0 To 9
If tmp = NumAry(ii) Then
validCode = validCode & ii
Exit For
End If
Next
If Len(validCode) = i Then validCode = validCode & "*"
Next
'关闭
st.Close()
Set st = Nothing
'程序完成
MsgBox("验证码是："&validCode)

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'获取指定矩形区域的特征码
'bp:矩形左上角的偏移 unitW:矩形宽 unitH:矩形高
'按照矩形图形从左到右、从上到下的方向进行提取，如该点二进制为1则表示为1，不然为0
Function getBound(bp)
Dim str,i,ii
st.Position = bp
For i=1 To unitH
For ii=1 To unitW
If AscB(st.Read(1)) = 1 Then
str = str & "1"
Else
str = str & "0"
End If
Next
st.Position = bp - i*imgWBytes
Next
getBound = str
End Function
'将2进制转化为数字
Function BinVal(bin)
dim ret
ret = 0
for i = lenb(bin) to 1 step -1
ret = ret *256 + ascb(midb(bin,i,1))
next
BinVal=ret
End Function

Rem 将字符转换成2进制数组的函数
function ASCIIToByteArray(sText)
Dim objRS
Dim lTemp
Dim sTemp
sTemp = ""
For lTemp = 1 to LenB(sText)
sTemp = sTemp & Right("00" & Hex(AscB(MidB(sText,lTemp,1))),2)
Next

set objRS = WScript.CreateObject("ADODB.Recordset")
objRS.Fields.Append "Temp",204,LenB(sText)+1
objRS.Open
objRS.AddNew
objRS("Temp") = sTemp ' ADODB will convert here
objRS.Update
objRS.MoveFirst
ASCIIToByteArray = objRS("Temp") ' A variant byte array is returned
objRS.Close
set objRS = Nothing
end function

将以上vbs源码另存为：验证码图片识别.vbs，并和1.jpg在同一目录：

三、识别结果

双击“验证码图片识别.vbs”，识别结果以下：