14条原则 (2) 首先检查最简单的:例如,MFC播放avi的时候在上面画东西

14条原则 (2) 首先检查最简单的:例如,MFC播放avi的时候在上面画东西我见过不少小孩撞了头以后,一边哭一边踹柱子。你一定也见过不少程序编译未
通过,或者逻辑错误,或者在游戏里被PK死了,然后摔鼠标砸键盘的。还有程序出了问题以后,大骂微软这垃圾编译器,或者操作系统的,断言,一定
是"这垃圾的XX有问题。"第二条原则是,首先最简单的。也就是,先检查最容易检查的。如果你病了,大
夫看了一眼,然后就断言,一定是某某病,回去吃某某药吧。你可能根本不敢相
信,虽然他要求你一圈检查,你又觉得他是有意让你多查以便赚钱。马上断言
的,大多是扯淡,只有一项一项排除的,才更可信一些。一项一项排除,从哪里开始呢?从最简单的。一个故事。一次,我在吉林大学某机器上,刚好主人不在,同时授权我使用。我
打开机器,看到了登录界面,用户名已有,要求口令。我开始试各种弱口令。姓
名缩写,电话号码,房间号,我甚至试了空格,无一命中。终于主人回来,告诉我,口令是:没有口令。只需回车,就会登录上去。但是这
最简单的可能,我没有试。另一个故事。当年还是novell网络横行时候,组一个游戏网。novell公司的
netware有个特性,可能是承袭自unix,登录的时候敲的键不会有任何回显,不
像微软会显示"*",你敲一个键,微软就显示一个"*"。所以有人开玩笑,你的密
码都被我看光啦,不就是星星星星星星星么。novell连个星号也不显示。当时我组一个网络,用一般用户什么的都登录正常了,就差用管理员,我记得是
叫admin还是supervisor登录,设置各种权限。就在这时,我卡住了。我登录不
上去。这种活经常干,按说不应该哪里出错。我开始排查,翻过来倒过去,就差
把整个网络重做了。半个小时还是两个小时,时间太久远,我记不清了,终于我想到了一种可能–键
盘上有个键坏掉了。而那个键,正好就在我的密码当中。所以,在系统看来,我
的密码总是错的。问题一旦找到,解决就容易至极,换个键盘。我没有试最简单的可能,有各种原因。阻止我想到那是最简单的可能的一个关键
因素是,我认为那是不可能的原因。很多年以后,有同学跟我说:老师,我编程序什么都觉得还顺利,就是建VC工程
太慢了,老是记不住。我答:那你就只建空工程,连续建20次。然后就记住了。对于那些被视作简单的练习,我都是这样回答的。如果你认为这个练习非常简
单,它一定花不了你多少时间,那么做一次也不费事;如果你认为这个练习太花
费时间了,那么,这一定是一个足够复杂的练习,非常值得一做。那些我们以为最简单的练习或者检查,如果花费的时间不多,为什么不执行一次
呢?断定一个程序正确的最佳方法,不是趴显示器上看两个小时,而是跑一遍。
跑一遍并不能断定它是正确的,但是如果跑不出正确结果,我们却可以飞快地证
实,它是错的。所以,如果程序不是特别大,你可以不停地编译,每隔一小段时间。让编译器保
证你始终走在正确的或尚可挽回的局面中。类似的,有同学问我,WORD写文章的时候,应该多长时间保存一次呢?答案不是
几分钟几小时,而是"你能够承受损失之前"。如果你一分钟能打个百八十字,而
且你不在乎损失这一分钟,那么这时你不必存盘,如果你一分钟只能打个二三十
字,而万一这时断电你会非常难过,你可以十秒钟就存盘一次。文章是由一次次
存盘构成的,而不是一个键入的字构成的,因为只有存盘的结果才能呈现与人。
不然,你就只能吹:我已经有了一个巨完美的证明,只是没有存盘。每次存盘,是可见的微小进步。那些微小的,应该引起我们最大的重视。有的同学可能会问:为什么要先检查最容易检查的,而不是先检查最可能的故障。
因为除非有十足的证据,仅凭猜测,你无法断言"最可能"的是什么。而获取更多
证据的方法,就是检查。如果你假设故障来自某个原因,准备开始检查,这检查
已经变成了一个新的实验,这时,你也应该首先检查一新实验中最容易的一项。当撞到柱子上,先检查完柱子没有移动过来主动攻击你,这几乎瞬间甚至我们没
有觉察就已经完成了;编译失败,逻辑错误,先检查自己的程序,而不是先假设
编译器有毛病,因为你假设编译器有毛病太困难了,通常超出了大多数同学的水
平。关于断言编译器有毛病,参见此系列后面的对比法。大骂微软编译器垃圾,十有八九最终发现垃圾的是自己。也许它的确很垃圾,但
我们编程的时候,肤浅到通常远未触及到它垃圾的部分。又一个故事,雷锋修车。传说雷锋修车的时候有个螺丝找不到了,找了半天也不
见踪影。战友说,算了吧。雷锋说,不行,万一掉到汽车里的某某地方,汽车就
要出大故障了。然后他们又找了很久,终于在就是那个某某地方找到了那个螺丝。这个故事原意说的是雷锋是个认真的好青年。我当时一直不明白,他们为什么不
先找那个某某地方呢?现在想想,如果这个故事是真的,也许他们有找螺丝的程序,先找最容易的,然
后步步向下。虽然过程漫长,但是最终总能解决问题。从最简单的开始检查,其实对应着一种非东方的科学思考方法。相关笑话一个。
说中国老太太和德国老太太把针掉到地上以后的反应。中国老太太会根据针掉的
方向,大致去看看,然后就找到了。德国老太太会把地板画上方格,然后一个格
子一个格子找,凌晨之前也许能找到。表面上看,中国老太太很有灵感,非常聪明。不过,德国老太太的方法的优势在
于,她一定能解决问题。她从某处开始找,可能就是最容易找的格子–虽然这个
格子并非最可能的方向,但是遍历之后,针必然在某个格子中。我们排除故障的时候,可以准备一个checklist (检查表?),把所有的可能原因
列上,然后开始排查。从简单到复杂,当表格扩展到某一位置的时候,问题就显
现出来了。这也是我们为什么要训练写作实验报告的一个原因。有经验的网络工程师检查故障的时候,不是凭直觉,而是先检查下三层,比如用
ping。如果下三层正常,再去检查DNS什么的。为什么先用ping,最主要的原因恐
怕正是因为这个工具用起来简单快速。显示器不亮,最先要排除的原因是什么?不是主板不是操作系统不是厂商的人
品,而是,先确定通电了。尤其是远程诊断的时候,尤其远程的用户并非熟练技
术人员的时候,并参见此系列后面的"永远不要相信你的用户"。编程的时候,我们通常正确的路线开始,用最朴素的方法。当然,什么方法才是
朴素的,是需要时间训练和一定的知识结构的。不是你最熟悉或唯一熟悉的方法
就是朴素的。然后,很多同学会犯一个错误。那就是,如果这个朴素的方法最开始的时候没有
工作,很多同学就放弃这个方法,转向另一个,如果那个方法也不好使,就再转
向一个新的。当你尝试某种技术路线的时候,一定要确保这种技术路线是不能用的。确保它不
能用的方法是,或者1.
你了解到它不适合这个项目的缺陷,2.你有充分的实验证
明它不适合,然后你还需要保留证据。这些证据就是你实验报告的内容,用以自
己备忘或吵架用。昨天,帮一个同学改MFC的程序。目标是用CAnimate控件播放avi文件的同时,在
上面画点东西。解决的步骤如下。1. 该同学说,他在OnPaint事件响应中写了画线,但是这线不显示。我请他演示,线确实不显示。我猜他没有发送OnPaint消息,所以响应函数没有
调用。他说他在OnPaint里写了弹出了一个MessagBox,验证这一点。我说,那你
应该看到好几百个MessageBox,如果OnPaint消息一直发送的话。他说,是的,
他看到了。我们没有看到那么多MessageBox。事实上,只在程序载入的时候弹出一个。所
以,OnPaint消息响应里的那些东西都没有一次次被执行。关于上述这一点,并非适用首先检查最简单的这一原则,而是适用"永远不要相
信你的用户",请见后文。2. 我们改了程序,OnPaint源源不断发来,也能画线了。但是线被CAnimate的控
件挡住了。我考虑到的方法: (1)在控件的上面放一个窗口,设置为透明,在那个窗口的工
作区里画东西; (2)网上查到的,设置控件为透明; (3)修改工作区所在窗口的
Z坐标,把它放到控件的顶上。头脑不清醒,有的我还走了几步。反正都不怎么好。 方法(1)这个方法太复杂,
感觉上这样的任务不应该太复杂,尤其是rush一个粗糙原型,不然VC太弱了,违
背了一般较完善系统功能的规律。方法 (2)失败了,原因不明,现象没有任何变
化。方法(3)简单太笨了,当时真的可能没有带大脑,那样控件就会被工作区遮
住,avi的播放就看不到了。然后我想到了一个方法,因为简单,所以马上试了试。简单,可能有效,是我们
选择一个方法的重要理由。我们发现CAnimate派生于CWnd,而CWnd::GetDC()可以取得CDC设备上下文,而
CDC上面是可以画东西的。事情就这样成了。在这个方案之前,还走了一小段弯路。我试图从控件的指针构造CDC。在控件没
有播放avi的时候,画的东西在控件上,当avi播放,画的东西消失了。我们猜
测,当avi播放的时候,CDC或者控件的指针不再安全地关联了。瞎猜的。MSDN中
对于handle,对象的指针,有一大堆文档,没有一一去读。这个原型能跑了,虽然很粗糙,一个劲闪烁。不过简单的,能快速有点效果的,
不停的小恩小惠,正是人类所追求的。其实,相对于这第2条原则,我有一个不良习惯。我往往最后才检查最简单的或最
可能的,尤其是年轻的时候。当时是希望借此积累经验。现在,我更希望把那些
用于积累经验的实验,放到解决问题以后。当然,问题解决以后,可能就没有情
致再去积累经验了。相对于经历本身,我们原始的渴望直接想得到的,往往是终结那一刻的快乐。所
以,我们可以经常向心中的小兽投食:你看,又一个可能的原因排除了,又一个。
这些小奶酪,安慰我们,使脆弱的我们可以坚持走完全程。虽然,那些都不是原因也不是结果,但是那些一路伴随我们的,该记录下来。在
最终审判以前,我们任谁都不知道哪个才是正解。如果没有记录的话,当那一刻
到来,你却早就忘记了如何走到这里。正是那些最简单的所有伴随我们的事件形成了我们,当你开始忘记,你就失去了
自己。

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