关于解析楼层和日期的简单示例

我是黑瞳

本人也是小白，对于解析楼层和日期信息出于爱好，现有一点点的体会，在此写出来希望大家互相学习探讨。错误之处楼主大大请指正。
解析之前，准备工作，以了解的略过。首先，各位要了解16进制，10进制，2进制之间的关系和转换。因为我们生活中采用的是10进制，计算机采用的2进制，计算机为了表达方便，数据以16进制转换。Windows自带的计算器程序员模式可以很好的互相转换，大家要善于利用。当然，论坛也有大神写的专门的软件。对于自用研究个人感觉还是使用计算器，用于加深理解。
废话不说了。开始来点实际的，先说楼层
说到楼层，有一个通俗的说法，叫8421码（10进制叫法），怎么来的呢。16进制F转换2进制是 1111 ，2进制每一位上的1从左到右不进位转回10进制就是8 4 2 1。一个F能控制4个楼层，这个数据包含了地址和控制信息，当2进制控制位对应楼层为1的时候可以按，对应楼层为0的时候不可以按。这种控制方法可以独立的控制每一个楼层的可不可以按。实际控制中数据都是从右到左看。
上示例：16进制 4001  转2进制=0100 0000 0000 0001 从左到右数哪一位上有1 ，数完后明白了可以以按1楼和15楼。
为什么数据楼层相同数据不一样？因为有地下室。大部分楼层控制都是从最下向上控制的（因为2进制排序），所以要看你的卡能到按几层，有无地下室，地下几层。总高多少层（决定控制数据位的最少长度）。同上还是15楼，一层地下室，可以按和不可以按，16进制数据分别为8003和8002，大家自行转回2进制看。
这是大部分梯控的表达方式，还有从顶层计算开始的，也有加密的，这个就靠大家自行研究了（其实我也不懂了）。
日期转换
日期表达方式有很多，常用不含加密的有约有3种，6位日期2种，4位日期一种。
6位第一种，直接明码，示例，180331 既是 18年3月31日
6位第一种，16进制转10进制，示例，12031F  既是 18年3月31日
4位日期，16进制转2进制分段，在转回10进制。示例，247F  既18年3月31日，咋来的，247F转2进制=0010010 0011 11111，从左到右7 4 5 分段，然后转后10进制就是18 03 31  （前面那2个零实际计算器不显示，4位16进制转换2进制是16位，感谢天纵小周大神指正）
日期有好多加密方式，不同的系统不同版本都可能不同。所以解析数据前要知道卡的好多信息，比如楼层，总高，到期日期。是否自动按楼。等，信息越详细定位数据越准确。
本论坛有坛友分享的好多小工具很不错，可以大大减轻我们的工作量，让我们一起学习吧。

XUGUANG

XUGUANG 发表于 2024-12-29 20:16
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各位大神，谁能帮帮忙，想改无期限，谢谢了

XUGUANG

XUGUANG 发表于 2024-12-29 20:16
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大神，这个怎么改无期限

XUGUANG

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A2小杨

谢谢楼主分享

kaixinwanzi

谢谢分享 让我慢慢消化一下  学习了

Zpf9579

长知识了，谢谢楼主分享。

东方之龙

复制下来。慢慢消化

东方之龙

长知识了，谢谢楼主分享。

66643225

小手一抖，积分带走

yaoqiang0688