TIFFWriteDirectory.3tiff.html
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<title>TIFFWriteDirectory</title>
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<h1 align=center>TIFFWriteDirectory</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#RETURN VALUES">RETURN VALUES</a><br>
<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
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<a name="NAME"></a>
<h2>NAME</h2>
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<p>TIFFWriteDirectory, TIFFRewriteDirectory,
TIFFCheckpointDirectory − write the current directory
in an open <small>TIFF</small> file</p>
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<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
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<p><b>#include <tiffio.h></b></p>
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<p><b>int TIFFWriteDirectory(TIFF *</b><i>tif</i><b>)<br>
int TIFFRewriteDirectory(TIFF *</b><i>tif</i><b>)<br>
int TIFFCheckpointDirectory(TIFF *</b><i>tif</i><b>)</b></p>
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<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
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<p><i>TIFFWriteDirectory</i> will write the contents of the
current directory to the file and setup to create a new
subfile in the same file. Applications only need to call
<i>TIFFWriteDirectory</i> when writing multiple subfiles to
a single <small>TIFF</small> file. <i>TIFFWriteDirectory</i>
is automatically called by <i>TIFFClose</i> and
<i>TIFFFlush</i> to write a modified directory if the file
is open for writing.</p>
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<p>The <i>TIFFRewriteDirectory</i> function operates
similarly to <i>TIFFWriteDirectory,</i> but can be called
with directories previously read or written that already
have an established location in the file. It will rewrite
the directory, but instead of place it at it’s old
location (as <i>TIFFWriteDirectory</i> would) it will place
them at the end of the file, correcting the pointer from the
preceeding directory or file header to point to it’s
new location. This is particularly important in cases where
the size of the directory and pointed to data has grown, so
it won’t fit in the space available at the old
location.</p>
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<p>The <i>TIFFCheckpointDirectory</i> writes the current
state of the tiff directory into the file to make what is
currently in the file readable. Unlike
<i>TIFFWriteDirectory, TIFFCheckpointDirectory</i> does not
free up the directory data structures in memory, so they can
be updated (as strips/tiles are written) and written again.
Reading such a partial file you will at worst get a tiff
read error for the first strip/tile encountered that is
incomplete, but you will at least get all the valid data in
the file before that. When the file is complete, just use
<i>TIFFWriteDirectory</i> as usual to finish it off
cleanly.</p>
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<a name="RETURN VALUES"></a>
<h2>RETURN VALUES</h2>
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<p>1 is returned when the contents are successfully written
to the file. Otherwise, 0 is returned if an error was
encountered when writing the directory contents.</p>
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<a name="DIAGNOSTICS"></a>
<h2>DIAGNOSTICS</h2>
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<p>All error messages are directed to the
<i>TIFFError</i>(3TIFF) routine.</p>
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<p><b>Error post-encoding before directory write</b>. Before
writing the contents of the current directory, any pending
data are flushed. This message indicates that an error
occurred while doing this.</p>
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<p><b>Error flushing data before directory write</b>. Before
writing the contents of the current directory, any pending
data are flushed. This message indicates that an error
occurred while doing this.</p>
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<p><b>Cannot write directory, out of space</b>. There was
not enough space to allocate a temporary area for the
directory that was to be written.</p>
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<p><b>Error writing directory count</b>. A write error
occurred when writing the count of fields in the
directory.</p>
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<p><b>Error writing directory contents</b>. A write error
occurred when writing the directory fields.</p>
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<p><b>Error writing directory link</b>. A write error
occurred when writing the link to the next directory.</p>
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<p><b>Error writing data for field "%s"</b>. A
write error occurred when writing indirect data for the
specified field.</p>
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<p><b>Error writing TIFF header</b>. A write error occurred
when re-writing header at the front of the file.</p>
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<p><b>Error fetching directory count</b>. A read error
occurred when fetching the directory count field for a
previous directory. This can occur when setting up a link to
the directory that is being written.</p>
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<p><b>Error fetching directory link</b>. A read error
occurred when fetching the directory link field for a
previous directory. This can occur when setting up a link to
the directory that is being written.</p>
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<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
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<p><b>TIFFOpen</b>(3TIFF), <b>TIFFError</b>(3TIFF),
<b>TIFFReadDirectory</b>(3TIFF),
<b>TIFFSetDirectory</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
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<p>Libtiff library home page:
<b>http://www.remotesensing.org/libtiff/</b></p>
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