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<title>TIFFWriteDirectory</title>
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<h1 align=center>TIFFWriteDirectory</h1>
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<a href="#NAME">NAME</a><br>
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<a href="#SYNOPSIS">SYNOPSIS</a><br>
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<a href="#DESCRIPTION">DESCRIPTION</a><br>
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<a href="#RETURN VALUES">RETURN VALUES</a><br>
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<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
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<a href="#SEE ALSO">SEE ALSO</a><br>
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<hr>
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<a name="NAME"></a>
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<h2>NAME</h2>
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<p style="margin-left:11%; margin-top: 1em">TIFFWriteDirectory,
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TIFFRewriteDirectory, TIFFCheckpointDirectory − write
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the current directory in an open <small>TIFF</small>
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file</p>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>#include
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<tiffio.h></b></p>
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<p style="margin-left:11%; margin-top: 1em"><b>int
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TIFFWriteDirectory(TIFF *</b><i>tif</i><b>) <br>
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int TIFFRewriteDirectory(TIFF *</b><i>tif</i><b>) <br>
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int TIFFCheckpointDirectory(TIFF *</b><i>tif</i><b>)</b></p>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p style="margin-left:11%; margin-top: 1em"><i>TIFFWriteDirectory</i>
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will write the contents of the current directory to the file
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and setup to create a new subfile in the same file.
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Applications only need to call <i>TIFFWriteDirectory</i>
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when writing multiple subfiles to a single
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<small>TIFF</small> file. <i>TIFFWriteDirectory</i> is
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automatically called by <i>TIFFClose</i> and
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<i>TIFFFlush</i> to write a modified directory if the file
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is open for writing.</p>
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<p style="margin-left:11%; margin-top: 1em">The
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<i>TIFFRewriteDirectory</i> function operates similarly to
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<i>TIFFWriteDirectory,</i> but can be called with
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directories previously read or written that already have an
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established location in the file. It will rewrite the
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directory, but instead of place it at it’s old
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location (as <i>TIFFWriteDirectory</i> would) it will place
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them at the end of the file, correcting the pointer from the
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preceeding directory or file header to point to it’s
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new location. This is particularly important in cases where
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the size of the directory and pointed to data has grown, so
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it won’t fit in the space available at the old
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location.</p>
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<p style="margin-left:11%; margin-top: 1em">The
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<i>TIFFCheckpointDirectory</i> writes the current state of
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the tiff directory into the file to make what is currently
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in the file readable. Unlike <i>TIFFWriteDirectory,
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TIFFCheckpointDirectory</i> does not free up the directory
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data structures in memory, so they can be updated (as
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strips/tiles are written) and written again. Reading such a
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partial file you will at worst get a tiff read error for the
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first strip/tile encountered that is incomplete, but you
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will at least get all the valid data in the file before
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that. When the file is complete, just use
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<i>TIFFWriteDirectory</i> as usual to finish it off
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cleanly.</p>
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<a name="RETURN VALUES"></a>
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<h2>RETURN VALUES</h2>
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<p style="margin-left:11%; margin-top: 1em">1 is returned
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when the contents are successfully written to the file.
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Otherwise, 0 is returned if an error was encountered when
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writing the directory contents.</p>
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<a name="DIAGNOSTICS"></a>
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<h2>DIAGNOSTICS</h2>
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<p style="margin-left:11%; margin-top: 1em">All error
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messages are directed to the <i>TIFFError</i>(3TIFF)
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routine.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Error
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post-encoding before directory write</b>. Before writing the
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contents of the current directory, any pending data are
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flushed. This message indicates that an error occurred while
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doing this.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Error
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flushing data before directory write</b>. Before writing the
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contents of the current directory, any pending data are
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flushed. This message indicates that an error occurred while
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doing this.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Cannot write
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directory, out of space</b>. There was not enough space to
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allocate a temporary area for the directory that was to be
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written.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Error
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writing directory count</b>. A write error occurred when
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writing the count of fields in the directory.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Error
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writing directory contents</b>. A write error occurred when
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writing the directory fields.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Error
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writing directory link</b>. A write error occurred when
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writing the link to the next directory.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Error
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writing data for field "%s"</b>. A write error
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occurred when writing indirect data for the specified
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field.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Error
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writing TIFF header</b>. A write error occurred when
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re-writing header at the front of the file.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Error
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fetching directory count</b>. A read error occurred when
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fetching the directory count field for a previous directory.
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This can occur when setting up a link to the directory that
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is being written.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Error
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fetching directory link</b>. A read error occurred when
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fetching the directory link field for a previous directory.
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This can occur when setting up a link to the directory that
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is being written.</p>
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2005-03-06 06:11:43 -05:00
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>TIFFOpen</b>(3TIFF),
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<b>TIFFError</b>(3TIFF), <b>TIFFReadDirectory</b>(3TIFF),
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<b>TIFFSetDirectory</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
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<p style="margin-left:11%; margin-top: 1em">Libtiff library
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home page: <b>http://www.remotesensing.org/libtiff/</b></p>
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