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让pdftohtml支持中文

没装fbgs时，查到pdftohtml和pdftotext可以转pdf为html和txt
不过对中文识别有些问题，我有几个用acrobat转doc成的pdf，用pdftohtml就能识别中文，而自己用latex写的就不行。

有个参数-c很搞笑，pdftohtml不认中文时，就把它们转成图片放到网页中。
另外有个参数是-enc,感觉不大会用，总说couldn't find unicodeMap.. “猜中”个UTF-8可以用，但是仍然不能正确转换。

原来我的pdftohtml是poppler-utils里的，后来把它卸了，装了xpdf一系列东西，以及一个单独的pdftohtml.
之后有一些变化，比如pdftohtml和pdftotext不需要参数就能正常转换的那几个pdf（说是用acrobat转的）,现在必须用参数-enc才可以，而且totext用-enc GBK可以，而tohtml用-enc GBK有乱码，用-enc EUC-CN才行。
另外/etc/xpdf有一些unicodeMap文件，定义了一些unicodeMap，然而用在我自己的pdf上还是不行。

最后我又改回poppler-utils了，还是觉得它提供的pdftohtml好使。而且-enc命令也可以用，这应该是某个xpdf的包支持的。（注意，我没有完全卸载xpdf的包，只是把和poppler-utils冲突的卸了）

今天发现了cmap宏包，说是可以让生成的pdf中的文字支持复制粘贴。不过我试过，没有用。
然后发现了ccmap宏包，这个是针对中文的，是cct宏包的一部分。源里没有这个东西，于是我到http://lsec.cc.ac.cn/cgi-bin/viewcvs.cgi/cct/ccmap/把里面的东西全下载下来(其中Makefile和t1.tex可以不要，另外Attic里面的文件也要下来），放到/usr/share/texmf/tex/latex/ccmap（具体要看tex的安装目录），把包解开，最后运行texhash
现在在.tex文件里加入\usepackage{ccmap}（我记得cmap要求是在\documentclass后紧接着就调入cmap,不知道ccmap是否也需要这样），再用pdflatex编译，哇！出现中文了，只是默认是utf-8输出的，用-enc GBK选项就好了！

最后，根据一个同学的说法，本质不在于cmap还是ccmap,只要有那些.cmap文件就行了，我试了过了，的确是这样，现在用\usepackage{cmap}也可以了。
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