我的postscript解释器在运行由typecheck生成的以下程序时definefont发出dvips错误。在我看来，两个重要的过程是/D和/E，它们似乎是：将六角形字符串解码为更方便的格式，并分别安装字体。
现在，xpost和我混淆的部分都在`/ E＆＃39;：
/E{pop nn A
definefont setfont}
其中nn是准备安装的字体字典，但A定义为：
/A{dup}
。 dup？现在我很困惑。 PLRM将definefont描述为
键 字体 definefont font
key cidfont definefont cidfont
那么-font- -font-应该做什么？我是否错误地检查了一个密钥的字典？
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为了完整起见，这是我的definefont代码。我坚持认为密钥是一个名字是错误的吗？
/definefont { % /fontname -dict-
dup type /dicttype ne
2 index type /nametype ne or {
/definefont cvx /typecheck signalerror
} if
{
dup /FontType known not {stop} if
dup /FontMatrix known not {stop} if
dup /Encoding known not {stop} if
dup /BuildChar known not {stop} if
} stopped {
/definefont cvx /invalidfont signalerror
} if
dup /FontName known not {
dup /FontName 3 index put
} if
FontDirectory exch 2 index exch put
findfont
} def
奖励绕口令和问题：为什么手动设置/manualfeed而不是拨打setmanualfeed？
答案 0 :(得分：2)
技术上，键不必是名称对象。
他们通常但他们并非必须如此。例如，可能有理由将整数用作字典中的键。所以我不得不说，从技术上讲，你坚持认为密钥是名称对象是不正确的。
请参阅第三版PLRM的第3.3.9节“字典对象”第41页，其中包含：
键通常是名称对象。 PostScript语法和 解释器针对这种最常见的情况进行了优化。但是，一把钥匙 可以是除null之外的任何PostScript对象（稍后定义）。
我并不是说在这种情况下它是明智的，请注意你，或者甚至可能是故意的。使用自身作为键来引用字典并不是很聪明。
至于为什么设置manualfeed，你会看到它在statusdict中设置它，所以这是一个旧的1级实现（2级及以上将使用setpagedevice）。供应商没有很好地指定或一致地实现1级中的设备控制，因此您可以在旧式代码中看到许多这样的变体。
我猜可能很久以前dvips重写了2级： - ）