TIFFWriteDirectory(3TIFF)												 TIFFWriteDirectory(3TIFF)

NAME

       TIFFWriteDirectory, TIFFRewriteDirectory, TIFFCheckpointDirectory - write the current directory in an open TIFF file

SYNOPSIS

       #include <tiffio.h>

       int TIFFWriteDirectory(TIFF *tif)
       int TIFFRewriteDirectory(TIFF *tif)
       int TIFFCheckpointDirectory(TIFF *tif)

DESCRIPTION

       TIFFWriteDirectory  will write the contents of the current directory to the file and setup to create a new subfile in the same file. Appli-
       cations only need to call TIFFWriteDirectory when writing multiple subfiles to a single TIFF  file.   TIFFWriteDirectory  is  automatically
       called by TIFFClose and TIFFFlush to write a modified directory if the file is open for writing.

       The  TIFFRewriteDirectory  function operates similarly to TIFFWriteDirectory, 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
       TIFFWriteDirectory 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.

       The  TIFFCheckpointDirectory  writes  the current state of the tiff directory into the file to make what is currently in the file readable.
       Unlike TIFFWriteDirectory, TIFFCheckpointDirectory 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
       TIFFWriteDirectory as usual to finish it off cleanly.

RETURN VALUES

       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.

DIAGNOSTICS

       All error messages are directed to the TIFFError(3TIFF) routine.

       Error post-encoding before directory write.  Before writing the contents of the current directory, any pending data are flushed. This  mes-
       sage indicates that an error occurred while doing this.

       Error  flushing data before directory write.  Before writing the contents of the current directory, any pending data are flushed. This mes-
       sage indicates that an error occurred while doing this.

       Cannot write directory, out of space.  There was not enough space to allocate a temporary area for the directory that was to be written.

       Error writing directory count.  A write error occurred when writing the count of fields in the directory.

       Error writing directory contents.  A write error occurred when writing the directory fields.

       Error writing directory link.  A write error occurred when writing the link to the next directory.

       Error writing data for field "%s".  A write error occurred when writing indirect data for the specified field.

       Error writing TIFF header.  A write error occurred when re-writing header at the front of the file.

       Error fetching directory count.	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.

       Error fetching directory link.  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.

SEE ALSO

       TIFFOpen(3TIFF), TIFFError(3TIFF), TIFFReadDirectory(3TIFF), TIFFSetDirectory(3TIFF), libtiff(3TIFF)

       Libtiff library home page: http://www.remotesensing.org/libtiff/

libtiff 							September 26, 2001					 TIFFWriteDirectory(3TIFF)