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<a name="windres"></a>
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Next: <a rel="next" accesskey="n" href="dlltool.html#dlltool">dlltool</a>,
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Previous: <a rel="previous" accesskey="p" href="windmc.html#windmc">windmc</a>,
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<h2 class="chapter">12 windres</h2>
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<p><samp><span class="command">windres</span></samp> may be used to manipulate Windows resources.
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<blockquote>
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<em>Warning:</em> <samp><span class="command">windres</span></samp> is not always built as part of the binary
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utilities, since it is only useful for Windows targets.
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</blockquote>
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<!-- man title windres manipulate Windows resources -->
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<pre class="smallexample"> <!-- man begin SYNOPSIS windres -->
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windres [options] [input-file] [output-file]
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<!-- man end -->
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</pre>
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<!-- man begin DESCRIPTION windres -->
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<p><samp><span class="command">windres</span></samp> reads resources from an input file and copies them into
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an output file. Either file may be in one of three formats:
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<dl>
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<dt><code>rc</code><dd>A text format read by the Resource Compiler.
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<br><dt><code>res</code><dd>A binary format generated by the Resource Compiler.
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<br><dt><code>coff</code><dd>A COFF object or executable.
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</dl>
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<p>The exact description of these different formats is available in
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documentation from Microsoft.
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<p>When <samp><span class="command">windres</span></samp> converts from the <code>rc</code> format to the <code>res</code>
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format, it is acting like the Windows Resource Compiler. When
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<samp><span class="command">windres</span></samp> converts from the <code>res</code> format to the <code>coff</code>
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format, it is acting like the Windows <code>CVTRES</code> program.
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<p>When <samp><span class="command">windres</span></samp> generates an <code>rc</code> file, the output is similar
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but not identical to the format expected for the input. When an input
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<code>rc</code> file refers to an external filename, an output <code>rc</code> file
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will instead include the file contents.
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<p>If the input or output format is not specified, <samp><span class="command">windres</span></samp> will
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guess based on the file name, or, for the input file, the file contents.
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A file with an extension of <samp><span class="file">.rc</span></samp> will be treated as an <code>rc</code>
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file, a file with an extension of <samp><span class="file">.res</span></samp> will be treated as a
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<code>res</code> file, and a file with an extension of <samp><span class="file">.o</span></samp> or
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<samp><span class="file">.exe</span></samp> will be treated as a <code>coff</code> file.
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<p>If no output file is specified, <samp><span class="command">windres</span></samp> will print the resources
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in <code>rc</code> format to standard output.
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<p>The normal use is for you to write an <code>rc</code> file, use <samp><span class="command">windres</span></samp>
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to convert it to a COFF object file, and then link the COFF file into
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your application. This will make the resources described in the
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<code>rc</code> file available to Windows.
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<!-- man end -->
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<!-- man begin OPTIONS windres -->
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<dl>
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<dt><samp><span class="env">-i </span><var>filename</var></samp><dt><samp><span class="env">--input </span><var>filename</var></samp><dd>The name of the input file. If this option is not used, then
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<samp><span class="command">windres</span></samp> will use the first non-option argument as the input file
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name. If there are no non-option arguments, then <samp><span class="command">windres</span></samp> will
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read from standard input. <samp><span class="command">windres</span></samp> can not read a COFF file from
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standard input.
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<br><dt><samp><span class="env">-o </span><var>filename</var></samp><dt><samp><span class="env">--output </span><var>filename</var></samp><dd>The name of the output file. If this option is not used, then
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<samp><span class="command">windres</span></samp> will use the first non-option argument, after any used
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for the input file name, as the output file name. If there is no
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non-option argument, then <samp><span class="command">windres</span></samp> will write to standard output.
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<samp><span class="command">windres</span></samp> can not write a COFF file to standard output. Note,
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for compatibility with <samp><span class="command">rc</span></samp> the option <samp><span class="option">-fo</span></samp> is also
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accepted, but its use is not recommended.
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<br><dt><samp><span class="env">-J </span><var>format</var></samp><dt><samp><span class="env">--input-format </span><var>format</var></samp><dd>The input format to read. <var>format</var> may be ‘<samp><span class="samp">res</span></samp>’, ‘<samp><span class="samp">rc</span></samp>’, or
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‘<samp><span class="samp">coff</span></samp>’. If no input format is specified, <samp><span class="command">windres</span></samp> will
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guess, as described above.
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<br><dt><samp><span class="env">-O </span><var>format</var></samp><dt><samp><span class="env">--output-format </span><var>format</var></samp><dd>The output format to generate. <var>format</var> may be ‘<samp><span class="samp">res</span></samp>’,
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‘<samp><span class="samp">rc</span></samp>’, or ‘<samp><span class="samp">coff</span></samp>’. If no output format is specified,
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<samp><span class="command">windres</span></samp> will guess, as described above.
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<br><dt><samp><span class="env">-F </span><var>target</var></samp><dt><samp><span class="env">--target </span><var>target</var></samp><dd>Specify the BFD format to use for a COFF file as input or output. This
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is a BFD target name; you can use the <samp><span class="option">--help</span></samp> option to see a list
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of supported targets. Normally <samp><span class="command">windres</span></samp> will use the default
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format, which is the first one listed by the <samp><span class="option">--help</span></samp> option.
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<a href="Target-Selection.html#Target-Selection">Target Selection</a>.
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<br><dt><samp><span class="env">--preprocessor </span><var>program</var></samp><dd>When <samp><span class="command">windres</span></samp> reads an <code>rc</code> file, it runs it through the C
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preprocessor first. This option may be used to specify the preprocessor
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to use, including any leading arguments. The default preprocessor
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argument is <code>gcc -E -xc-header -DRC_INVOKED</code>.
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<br><dt><samp><span class="env">--preprocessor-arg </span><var>option</var></samp><dd>When <samp><span class="command">windres</span></samp> reads an <code>rc</code> file, it runs it through
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the C preprocessor first. This option may be used to specify additional
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text to be passed to preprocessor on its command line.
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This option can be used multiple times to add multiple options to the
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preprocessor command line.
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<br><dt><samp><span class="env">-I </span><var>directory</var></samp><dt><samp><span class="env">--include-dir </span><var>directory</var></samp><dd>Specify an include directory to use when reading an <code>rc</code> file.
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<samp><span class="command">windres</span></samp> will pass this to the preprocessor as an <samp><span class="option">-I</span></samp>
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option. <samp><span class="command">windres</span></samp> will also search this directory when looking for
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files named in the <code>rc</code> file. If the argument passed to this command
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matches any of the supported <var>formats</var> (as described in the <samp><span class="option">-J</span></samp>
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option), it will issue a deprecation warning, and behave just like the
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<samp><span class="option">-J</span></samp> option. New programs should not use this behaviour. If a
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directory happens to match a <var>format</var>, simple prefix it with ‘<samp><span class="samp">./</span></samp>’
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to disable the backward compatibility.
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<br><dt><samp><span class="env">-D </span><var>target</var></samp><dt><samp><span class="env">--define </span><var>sym</var><span class="env">[=</span><var>val</var><span class="env">]</span></samp><dd>Specify a <samp><span class="option">-D</span></samp> option to pass to the preprocessor when reading an
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<code>rc</code> file.
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<br><dt><samp><span class="env">-U </span><var>target</var></samp><dt><samp><span class="env">--undefine </span><var>sym</var></samp><dd>Specify a <samp><span class="option">-U</span></samp> option to pass to the preprocessor when reading an
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<code>rc</code> file.
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<br><dt><samp><span class="env">-r</span></samp><dd>Ignored for compatibility with rc.
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<br><dt><samp><span class="env">-v</span></samp><dd>Enable verbose mode. This tells you what the preprocessor is if you
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didn't specify one.
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<br><dt><samp><span class="env">-c </span><var>val</var></samp><br><dt><samp><span class="env">--codepage </span><var>val</var></samp><dd>Specify the default codepage to use when reading an <code>rc</code> file.
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<var>val</var> should be a hexadecimal prefixed by ‘<samp><span class="samp">0x</span></samp>’ or decimal
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codepage code. The valid range is from zero up to 0xffff, but the
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validity of the codepage is host and configuration dependent.
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<br><dt><samp><span class="env">-l </span><var>val</var></samp><br><dt><samp><span class="env">--language </span><var>val</var></samp><dd>Specify the default language to use when reading an <code>rc</code> file.
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<var>val</var> should be a hexadecimal language code. The low eight bits are
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the language, and the high eight bits are the sublanguage.
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<br><dt><samp><span class="env">--use-temp-file</span></samp><dd>Use a temporary file to instead of using popen to read the output of
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the preprocessor. Use this option if the popen implementation is buggy
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on the host (eg., certain non-English language versions of Windows 95 and
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Windows 98 are known to have buggy popen where the output will instead
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go the console).
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<br><dt><samp><span class="env">--no-use-temp-file</span></samp><dd>Use popen, not a temporary file, to read the output of the preprocessor.
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This is the default behaviour.
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<br><dt><samp><span class="env">-h</span></samp><br><dt><samp><span class="env">--help</span></samp><dd>Prints a usage summary.
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<br><dt><samp><span class="env">-V</span></samp><br><dt><samp><span class="env">--version</span></samp><dd>Prints the version number for <samp><span class="command">windres</span></samp>.
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<br><dt><samp><span class="env">--yydebug</span></samp><dd>If <samp><span class="command">windres</span></samp> is compiled with <code>YYDEBUG</code> defined as <code>1</code>,
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this will turn on parser debugging.
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</dl>
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