(eplain.info)Checking for PDF output

---

Next: Loading LaTeX packages Prev: Boxes Up: User definitions

---

Enter node , (file) or (file)node

4.22 Checking for PDF output
============================

pdfTeX is a TeX variant that can output both '.dvi' and '.pdf' (Adobe's
Portable Document Format) files (see
<http://www.ctan.org/tex-archive/systems/pdftex>). You might sometimes
want to know whether the target format is '.pdf' or '.dvi'. The '\ifpdf'
switch can be used to detect pdfTeX in PDF mode:

     \ifpdf
        This text is produced when pdfTeX is in PDF mode.
     \else
        This text is produced when pdfTeX is in DVI mode,
        or when some program other than pdfTeX is used.
     \fi

   Keep in mind that '\ifpdf' is set based on the value of the
'\pdfoutput' primitive of pdfTeX at the time Eplain is loaded. If you
change the value of '\pdfoutput' after you load Eplain, '\ifpdf' will
not reflect the change.

   Eplain defines '\ifpdf' by incorporating Heiko Oberdiek's
'ifpdf.sty', which is available at
<http://www.ctan.org/tex-archive/macros/latex/contrib/oberdiek/ifpdf.sty>.