用ASP生成XBM数字图片

发表于:2007-06-30来源:作者:点击数: 标签:
XBM图片是一个纯文本的文件,可以用ASP来自动生成。可以用它来使用网站登陆的验证码; 我们用记事本打开该文件进行分析: 其文件结构为: #define counter_width 48 #define counter_height 9 static unsigned char counter_bits[]={7c,3c,7c,3c,70,3c,fe,7c,
XBM图片是一个纯文本的文件,可以用ASP来自动生成。可以用它来使用网站登陆的验证码;
我们用记事本打开该文件进行分析:
其文件结构为:
#define counter_width 48
#define counter_height 9
static unsigned char counter_bits[]={7c,3c,7c,3c,70,3c,fe,7c,fe,7c,78,7c,ee,ee,ee,ee,7c,ee,e0,ee,60,ee,74,ee,70,fe,30,fe,70,fe,38,ec,e0,ec,70,ec,1c,e0,ee,e0,70,e0,fe,7e,fe,7e,70,7e,fe,3c,7c,3c,70,3c}
文件扩展名为:.xbm

#define counter_width 48 ‘’这儿定义的是图片的宽度,一般为8的倍数
#define counter_height 9 ‘’这儿定义的是图片的高度,是任意的。
static unsigned char counter_bits[]={7c,3c,7c,3c,70,3c,fe,7c,fe,7c,78,7c,ee,ee,ee,ee,7c,ee,e0,ee,60,ee,74,ee,70,fe,30,fe,70,fe,38,ec,e0,ec,70,ec,1c,e0,ee,e0,70,e0,fe,7e,fe,7e,70,7e,fe,3c,7c,3c,70,3c} ‘’这儿是图片用来显示内容的十六进制的代码

正如static unsigned char英文意思为静态的,无符号的,烧焦的。它只能用来显示黑白两种颜色。二进制中的1将来用显示为黑色,0为白色。

下面为0~9数字的二进制数组(其中的图片样式仅试用于本例。如果需要别的0~9数字样式,请另自行生成)

‘’此处声明0~9绘图用数组

dim num(9,8)
‘’数字0
num(0,0)="0x38"
num(0,1)="0x7c"
num(0,2)="0xee"
num(0,3)="0xee"
num(0,4)="0xee"
num(0,5)="0xee"
num(0,6)="0xee"
num(0,7)="0x7c"
num(0,8)="0x38"
‘’数字1
num(1,0)="0x70"
num(1,1)="0x78"
num(1,2)="0x7c"
num(1,3)="0x74"
num(1,4)="0x70"
num(1,5)="0x70"
num(1,6)="0x70"
num(1,7)="0x70"
num(1,8)="0x70"
‘’数字2
num(2,0)="0x7c"
num(2,1)="0xfe"
num(2,2)="0xee"
num(2,3)="0xe0"
num(2,4)="0x70"
num(2,5)="0x38"
num(2,6)="0x1c"
num(2,7)="0xfe"
num(2,8)="0xfe"
‘’数字3
num(3,0)="0x7c"
num(3,1)="0xfe"
num(3,2)="0xee"
num(3,3)="0x60"
num(3,4)="0x30"
num(3,5)="0xe0"
num(3,6)="0xee"
num(3,7)="0xfe"
num(3,8)="0x7c"
‘’数字4
num(4,0)="0x70"
num(4,1)="0x78"
num(4,2)="0x7c"
num(4,3)="0x76"
num(4,4)="0x77"
num(4,5)="0xff"
num(4,6)="0xff"
num(4,7)="0x70"
num(4,8)="0x70"
‘’数字5
num(5,0)="0xfc"
num(5,1)="0xfc"
num(5,2)="0x0c"
num(5,3)="0x7e"
num(5,4)="0xfe"
num(5,5)="0xe0"
num(5,6)="0xee"
num(5,7)="0xfe"
num(5,8)="0x7c"
‘’数字6
num(6,0)="0x78"
num(6,1)="0xfc"
num(6,2)="0x0e"
num(6,3)="0x6e"
num(6,4)="0xfe"
num(6,5)="0xee"
num(6,6)="0xee"
num(6,7)="0xfc"
num(6,8)="0x78"
‘’数字7
num(7,0)="0xfe"
num(7,1)="0xfe"
num(7,2)="0x60"
num(7,3)="0x70"
num(7,4)="0x38"
num(7,5)="0x38"
num(7,6)="0x18"
num(7,7)="0x1c"
num(7,8)="0x1c"
‘’数字8
num(8,0)="0x7c"
num(8,1)="0xfe"
num(8,2)="0xee"
num(8,3)="0x7c"
num(8,4)="0x7c"
num(8,5)="0xee"
num(8,6)="0xee"
num(8,7)="0xfe "
num(8,8)="0x7c"
‘’数字9
num(9,0)="0x3c"
num(9,1)="0x7c"
num(9,2)="0xee"
num(9,3)="0xee"
num(9,4)="0xfe"
num(9,5)="0xec"
num(9,6)="0xe0"
num(9,7)="0x7e"
num(9,8)="0x3c"

原文转自:http://www.ltesting.net