Date: 2001-02-28 17:02:00

exit trouble shooting

### Trouble Shooting

• Bitmaps • LaTeX • Fonts • C programs • Scripts • Environment File • tex4ht.sty / *.4ht • DVI Code • JavaScript • Subscripts and Superscripts

Bitmaps

Bad Quality of Pictures

  Increase the density (number of dots per inch) when converting the pictures, and then sub-sample the picture. Specifically, replace in ‘tex4ht.env’ the switch

  -density 110x100

  with the switch

  -density 220x220 -geometry 50%

  or with another switch of the form

  -density ...x... -geometry ...%

  The -density switch increases the number of pixels per inch, and the -geometry option reduces that number. The process smoothes (anti-aliases) the edges. Typically screens display about 72 to 100 dots per inch.

  The type of fonts in use may also affect the quality of the output. In particular, Type 1 fonts (scalable outlines) offer better outcome than Type 3 (bitmapped) fonts.

Truncated and empty gifs for Xfig pictures

  Some Xfig files are made up of overlapping picture environments, with TeX4ht viewing the components as defining independent figures. The problem can be solved by importing the Xfig files into pictorial environments of TeX4ht.

         \newenvironment{mypic}{\Picture*{}}{\EndPicture}
         \begin{mypic} \input{xfig-file}   \end{mypic}

LaTeX

Unable to find a newly installed file

  The TeX engine might require an update of a search directory: the ls-R database for installations employing kpathsea (run texhash), the data base directory in the case of MiKTeX (select tart -> Programs -> MiKTeX -> Refresh', or run \`'initexmf -u' from a DO session, to update it).

Fonts

Can’t find/open file foo.tfm

  - Locate the directory where LaTeX/TeX finds font foo.tfm, and add to tex4ht.env a ‘t’ record pointing to that directory (e.g., ‘tc:\localtexmf\fonts\tfm!’).
  - Insert the record at the start of the line. TeX4ht considers the first character in each line to be a code describing the type of the record in hand. Lines which start with unrecognized character codes, spaces included, are ignored.
  - Note also that LaTeX/TeX may create fonts on the fly and put them in a temporary directory (e.g., ‘/var/tmp/texfonts/tfm/’).
Linux, Netscape, and the SYMBOL font

  To display the SYMBOL fonts in Netscape on Linux add

  Netscape*documentFonts.charset*adobe-fontspecific: iso-8859-1

  to the ~/.Xdefaults file

C programs

tex4ht.c doesn’t compile ... ERROR:3396: ‘DIR’ undeclared (first use this function)...

  Consider adding the switch ‘-DHAVE_DIRENT_H’ to the command line. For instance,

  cc -o tex4ht tex4ht.c -DENVFILE='"path/tex4ht.dir/tex4ht.env"' -DHAVE_DIRENT_H

Scripts

Bad end-of-line characters in htlatex.bat/httex.bat/htexi.bat/ht.bat

  Remove undesirable trailing characters in the lines of the scripts, introduced by the utilities which download the files.

  DOS/WINDOW platforms use an endline pair of characters: a carriage return and a line feed (0Dx,0Ax hexadecimal; 13,10 decimal). MAC platforms use only a single carriage feed character (0Dx; 13dec). UNIX platforms use only a single line feed character (0Ax; 10 dec).

Can’t find/open file ‘xxx.dvi’ or ‘xxx.lg’

  In some platforms, the operating systems pass on the quotes of the parameters of htlatex, httex, and httexi to the utilities tex4ht and t4ht. In such cases, the utilities issue complaints of the above nature for file names ‘xxx’ other than those being compiled. The problem can be resolved by installing a filter named ‘htcmd’, and submitting the tex4ht and t4ht commands to the filter. Backslash characters ‘\’ might need replacements with double backslash characters ‘\\’ or forward slash characters ‘/’.

  For instance, if htlatex.bat contains a command line of the form ‘C:\tex4ht\t4ht %1 %4’, then after introducing the filter the modified command line will take the form ‘C:\\tex4ht\\htcmd C:\\tex4ht\\t4ht %1 %4’.

Environment File

Can’t find/open file ‘tex4ht.env’

  Set an environment variable TEX4HTENV to the address of the file, add the switch ‘-e...address-of-tex4ht.env...’ to the command lines of t4ht and tex4ht within the htlatex, httex, httexi, and ht (or htlatex.bat, httex.bat, httexi.bat, and ht.bat) scripts, or make the location of the environment file known to the programs in another manner (see the pointers from the entry ‘tex4ht.env’ in the index).

No permission for system call: ...

  Make sure that the ‘S’ records in tex4ht.env don’t end with invisible spaces, and that the file ends with the record ‘% end of file’.

Problems with argument -d... of t4ht

  The specified directory must be augmented by a slash character /.

Problems with the convert utility

  - Make sure the convert program of ImageMagick is called and not another convert system in your directories. In the latter case, insert the full address of convert into the following command within tex4ht.env.

    Gconvert -crop 0x0 -density 110x110 -transparency '#FFFFFF' zz%%4.ps %%3

    For instance, use

    Gc:\TeX\Imagick\convert

    instead of

    Gconvert

  - You might need to remove the quotes from '#FFFFFF'

tex4ht.sty / *.4ht

Foreign content in <title>...</title> elements

  Use the \Configure{@TITLE}{...} command to redefine for the these elements the harmful macros that appear in headers of logical units like \title and \chapter. For instance, the definition \Configure{@TITLE}{\def\LaTeX{LaTeX}} for the source \title{with \LaTeX}.

Problematic commands in titles of logical divisions

  Commands within titles of divisions might need protection when transported by tex4ht to other locations. The command \Configure{NoSection}{..before...}{...after...} may be used for such a purpose.

DVI Code

XDVI/DVIWINDO/YAP... hang on \special command

  The dvi code produced by tex4ht is not valid for use with other utilities. Recompile the source file without the presence of tex4ht, to provide a proper code to your dvi viewer.

JavaScript

‘onovermouse’ package option

  This option currently relies on the JavaScript utility overlib.js of Erik Bosrup. The file might need to be fixed at line 234, by introducing ‘return "";’ instead of ‘return;’ (an already reported problem).

Subscripts and Superscripts

Loss of structural information

  Subscripts and superscripts are among the weakest points of tex4ht. In order to recognize them for non-bitmap representations, TeX4ht changes the category codes of ‘^’ and ‘_’, upon reaching the \begin{document} instruction, and ignores the operations if introduced earlier.

  The ideal solution would have been to get the superscript and subscript operations, as well as the empty bases ‘{}’, marked upon request by the native compilers in the dvi code. Currently, that is just a good night dream.

  The solutions I use are,

  1. Redefine in the *.4ht files macros that appear in libraries, by replacing there the ‘_’ and ‘^’ operations with \sb and \sp macros. The danger in this approach is that occasionally users provide new meanings to existing control sequences, without tex4ht taking it into account.
  2. Prepare cfg files, for sources which don’t belong to me, consisting of redefinitions for the the sensitive macros. Then I reload the redefinitions under the eyes of tex4ht. For instance, the configuration file test.cfg

         \Preamble{}

         \renewcommand{\FQED}[2]{F_{#1#2}}
         \renewcommand{\Mlones}{M^2}
         \renewcommand{\bzms}{M^2_{_0}}

         \begin{document}
         \EndPreamble

     for a source test.tex, and a compilation invoked through the command ‘mzlatex test "test"’.

  3. Use \sb and \sp, instead of ‘_’ and ‘^’, in preambles of files I write, or push the definitions to after the \begin{document} statement.