附加码生产程序

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<%@ Page Language="VB" debug=true%>
<%@ Import Namespace="system"%>
<%@ Import Namespace="system.Drawing"%>
<%@ Import Namespace="system.Drawing.Imaging"%>
<%@ Import Namespace="system.IO"%>
<script  runat="server">
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  ''        附加码生产程序  附加码生产程序  附加码生产程序  附加码生产程序         ''
  ''                                                                               ''
  '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
  ''                                                                               ''
  ''                            为  教  师  节  献  礼                             ''
  ''                                                                               ''
  ''    今天要写附加码验证程序,本来想偷懒,可在网上搜索了好久没有一断满意的代码, ''
  ''索性就自己写了这段代码,运行后觉得效果不错!不敢私藏,特拿来给大家分享!以此感 ''
  ''谢CSDN、以及在CSDN的高手们!!                                                 ''
  ''                                                                               ''
  ''                                                                               ''
  ''                                                望大家发表你尊贵的意见!       ''
  ''                                                                               ''
  ''                                                       
dudu8686@126.com       ''
  ''                                                             2004年9月10日     ''
  ''                                                                               ''
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sub page_load(byval sender As Object,byval E As EventArgs)
 'Font_Size'字体大小 intrger
 'Char_Number'验证码的位数 intrger
 'BackgroundColor'背景颜色 十六进制数的字符串
 dim My_Stream as MemoryStream=Get_Images(20,50,"#000000")
 Show_image(My_Stream)'显示内存图像
 My_Stream.Close()'关闭打开的流文件
end sub

'Font_Size'字体大小 intrger
'Char_Number'验证码的位数 intrger
'BackgroundColor'背景颜色 十六进制数的字符串
function Get_Images(Font_Size as integer,Char_Number as integer,BackgroundColor as string) as MemoryStream'把字符转换为图像,并且保存到内存流
 dim image_w as integer=int(Font_Size*1.5)+Font_Size*Char_Number'这个数字在调用页面需要,你要自己算出明确的数值 注意注意注意注意!!!!!
 dim image_h as integer=int(2.5*Font_Size)'这个数字在调用页面需要,你要自己算出明确的数值    注意注意注意注意!!!!!
 
 dim Temp_Bitmap as Bitmap'封装GDI+位图 
 dim Temp_Graphics as Graphics'封装GDI+绘图面
 dim Color_Back as Color=ColorTranslator.FromHtml(BackgroundColor)'背景颜色 
 
 Temp_Bitmap = new Bitmap(image_w, 5*image_h, PixelFormat.Format32bppRgb)'注意注  确定背景大小
 
 Temp_Graphics = Graphics.FromImage(Temp_Bitmap) 
 Temp_Graphics.FillRectangle(new SolidBrush(Color_Back),new Rectangle(0, 0,image_w, 5*image_h))'注意注   绘制背景 
 
 DIM Sesson_Company AS String=""'为了进行验证比较
 dim n as integer
 for n= 0 to Char_Number-1
  dim Show_Str as string=getChar()'要显示为图像的字符
  Sesson_Company=Sesson_Company & Show_Str
  dim Show_Str_Font_Size as integer=Int(3 * Rnd()+(Font_Size-2))'字体随机大小   下波动2
  dim Color_Font as Color= ColorTranslator.FromHtml(getColor())'字体随机颜色
  dim Show_Font_Name as string=getFont()'字体 
  dim Show_Str_Font as Font=new Font(Show_Font_Name,Show_Str_Font_Size,FontStyle.Bold)'定义文本格式(字体,字号,粗体)
  Temp_Graphics.DrawString(Show_Str, Show_Str_Font, new SolidBrush(Color_Font), int(Font_Size/2)+n*Font_Size, Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4
 next
 session("imagenumber")=LCase(trim(Sesson_Company))'保存到session便于调用的页面比较  '不区分大小写 
 
 Font_Size=Font_Size*4
 image_h=int(2.5*Font_Size)
 Temp_Graphics.DrawString("欢", new Font(getFont1(),Int(3 * Rnd()+(Font_Size-2)),FontStyle.Bold), new SolidBrush(ColorTranslator.FromHtml(getColor())), int(Font_Size/5+0*1.3*Font_Size), int(image_h/4)+Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4
 Temp_Graphics.DrawString("迎", new Font(getFont1(),Int(3 * Rnd()+(Font_Size-2)),FontStyle.Bold), new SolidBrush(ColorTranslator.FromHtml(getColor())), int(Font_Size/5+1*1.3*Font_Size), int(image_h/4)+Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4
 Temp_Graphics.DrawString("使", new Font(getFont1(),Int(3 * Rnd()+(Font_Size-2)),FontStyle.Bold), new SolidBrush(ColorTranslator.FromHtml(getColor())), int(Font_Size/5+2*1.3*Font_Size), int(image_h/4)+Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4
 Temp_Graphics.DrawString("用", new Font(getFont1(),Int(3 * Rnd()+(Font_Size-2)),FontStyle.Bold), new SolidBrush(ColorTranslator.FromHtml(getColor())), int(Font_Size/5+3*1.3*Font_Size), int(image_h/4)+Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4
 Temp_Graphics.DrawString("! ", new Font(getFont1(),Int(3 * Rnd()+(Font_Size-2)),FontStyle.Bold), new SolidBrush(ColorTranslator.FromHtml(getColor())), int(Font_Size/5+4*1.3*Font_Size), int(image_h/4)+Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4
 Temp_Graphics.DrawString("请", new Font(getFont1(),Int(3 * Rnd()+(Font_Size-2)),FontStyle.Bold), new SolidBrush(ColorTranslator.FromHtml(getColor())), int(Font_Size/5+5*1.3*Font_Size), int(image_h/4)+Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4
 Temp_Graphics.DrawString("按", new Font(getFont1(),Int(3 * Rnd()+(Font_Size-2)),FontStyle.Bold), new SolidBrush(ColorTranslator.FromHtml(getColor())), int(Font_Size/5+6*1.3*Font_Size), int(image_h/4)+Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4
 Temp_Graphics.DrawString("F5", new Font(getFont1(),Int(3 * Rnd()+(Font_Size-2)),FontStyle.Bold), new SolidBrush(ColorTranslator.FromHtml(getColor())), int(Font_Size/5+7*1.3*Font_Size), int(image_h/4)+Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4
 Temp_Graphics.DrawString("键", new Font(getFont1(),Int(3 * Rnd()+(Font_Size-2)),FontStyle.Bold), new SolidBrush(ColorTranslator.FromHtml(getColor())), int(Font_Size/5+8*1.3*Font_Size), int(image_h/4)+Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4
 Temp_Graphics.DrawString("!", new Font(getFont1(),Int(3 * Rnd()+(Font_Size-2)),FontStyle.Bold), new SolidBrush(ColorTranslator.FromHtml(getColor())), int(Font_Size/5+9*1.3*Font_Size), int(image_h/4)+Int(image_h*0.125 * Rnd()+image_h*0.08))'绘出字符 '绘字符的Y方向下波动+4 
 
 dim Temp_Stream as MemoryStream=new MemoryStream()
 Temp_Bitmap.Save(Temp_Stream, ImageFormat.jpeg)
 Temp_Graphics.Dispose()'释放资源
 Temp_Bitmap.Dispose()'释放资源
 Temp_Stream.Close()'关闭打开的流文件
 return Temp_Stream'返回流
end function

function Show_image(Show_Stream as MemoryStream)'显示内存图像
 Response.ClearContent()
 Response.ContentType = "Image/Jpeg"
 Response.BinaryWrite(Show_Stream.ToArray())
 Response.End()
end function

function getChar() as string'获得随机字符 0-9 a-z A-Z
 Dim Char_array(5)
    Char_array(0) = chr(Int(10 * Rnd()+48))
    Char_array(1) = chr(Int(26 * Rnd()+65))
    Char_array(2) = chr(Int(26 * Rnd()+65))
    Char_array(3) = chr(Int(26 * Rnd()+97))
    Char_array(4) = chr(Int(26 * Rnd()+97))
 return Char_array(Int(5 * Rnd()))
end function

function getColor() as string'获得随机颜色
 Dim int_a As integer
 Dim int_b As integer
 Dim int_c As integer
 int_a=Int(180 * Rnd()+20)
 int_b=Int(180 * Rnd()+20)
 int_c=Int(180 * Rnd()+20)
 if int_a>150 and int_b>150 and int_c>150 then int_a=Int(150 * Rnd()+20)
 return "#" & Hex(int_a) & Hex(int_b) & Hex(int_c)
end function

function getFont() as string'获得随机字体
 Dim font_array(7)
    font_array(0) = "Book Antiqua"
    font_array(1) = "Microsoft Sans Serif"
    font_array(2) = "Comic Sans MS"
    font_array(3) = "Comic Sans MS"
    font_array(4) = "Comic Sans MS"
    font_array(5) = "Comic Sans MS"
 font_array(6) = "Comic Sans MS"
 return font_array(Int(7 * Rnd()))
end function

function getFont1() as string'获得随机字体
 Dim font_array(10)
    font_array(0) = "华文行楷"
    font_array(1) = "隶书"
    font_array(2) = "华文彩云"
    font_array(3) = "方正舒体"
    font_array(4) = "华文彩云"
    font_array(5) = "方正舒体"
    font_array(6) = "华文彩云"
    font_array(7) = "方正舒体"
    font_array(8) = "楷体_GB2312"
    font_array(9) = "华文行楷"
 return font_array(Int(10 * Rnd()))
end function
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'                                            注        意                                               '
'                                                                                                       '                                                                              '
'把所有的代码保存为:ChrToImages.aspx    --------->可以直接运行看效果                                   '
'在其它页面的调用方法:<img width=image_w height=image_h src="ChrToImages.aspx" align="absmiddle">      '
'image_w、image_h,你要自己算出明确的数值,并注意session("imagenumber")                                   '
'                                                                                                       '
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</script>