num.asp

一个用asp实现简单的小型OA系统

<%
Option Explicit
Response.buffer = True
Response.Expires = -1
Response.ExpiresAbsolute = Now() - 1

Call Com_CreatValidCode("GetCode")

Sub Com_CreatValidCode(pSN)
    ' 禁止缓存
    Response.Expires = 90
    Response.AddHeader "Pragma", "no-cache"
    Response.AddHeader "cache-ctrol", "no-cache"
    Response.ContentType = "Image/BMP"

    Randomize

    Dim i, ii, iii

    Const cOdds = 3 ' 杂点出现的机率
    Const cAmount = 10 ' 文字数量
    Const cCode = "0123456789"

    ' 颜色的数据(字符，背景)
    Dim vColorData(1)
    vColorData(0) = ChrB(250) & ChrB(0) & ChrB(50) ' 蓝0，绿0，红0（黑色）
    vColorData(1) = ChrB(243) & ChrB(237) & ChrB(207) ' 蓝250，绿236，红211（浅蓝色）

    ' 随机产生字符
    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 '记录入Session
    ' 字符的数据
    Dim vNumberData(9)
    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"
    ' 输出图像文件头
    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)

    ' 输出图像信息头
    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 ' 历经所有行
        For ii = 0 To 3 ' 历经所有字
            For iii = 1 To 10 ' 历经所有像素
                ' 逐行、逐字、逐像素地输出图像数据
                If Rnd * 99 + 1 < cOdds Then ' 随机生成杂点
                    If Mid(vNumberData(vCode(ii)), i * 10 + iii, 1) Then
                        Response.BinaryWrite vColorData(0)
                    Else
                        Response.BinaryWrite vColorData(1)
                    End If
                Else
                    Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1))
                End If
            Next
        Next
    Next
End Sub
%>