getcode.asp

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<%
option explicit
response.buffer=true
call com_creatvalidcode("getcode")

sub com_creatvalidcode(psn)
	response.expires = -1 
	response.addheader "pragma","no-cache"
	response.addheader "cache-ctrol","no-cache"
	response.contenttype = "image/bmp"
	
	randomize
	
	dim i, ii, iii
	
	const codds = 6 ' 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(155) & chrb(58) & chrb(48)  ' 蓝0，绿0，红0（黑色）
	vcolordata(1) = chrb(255) & chrb(223) & chrb(223) ' 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
	     response.binarywrite vcolordata(0)
	    else
	     response.binarywrite vcolordata(mid(vnumberdata(vcode(ii)), i * 10 + iii, 1))
	    end if
	   next
	  next
	next
end sub
%>