LibTiff Mailing List

Bruce Cameron wrote:
> 
> This is a question that requires a bit of explanation.  I am on NT using
> the TIFF library [in C++].  So, if there is an error, there is a dialog
> box brought up and the program waits for user reply.  This is fine for
> interactive use, but not for workhorse programs that run at night.
> Fine,
> the library has a command for turning off dialog and writing to a log
> file.  But I wanted to see any 'odd' such messages and stop the off
> line processing.  But some of the messages I know for the current set
> of images are unimportant - so I added the 'TIFFReassignTagToIgnore'
> function [I am responsible for putting that into the last library
> release].  This lets the user specify tags that he/she knows will
> cause the dialog, set them to be ignored so no diallg, but if another
> error the dialog will come up and user be alerted.  Now I find some
> files that have 'TIFF tags out of order'.  I used tiffinfo to find
> out what, and in fact in this case the out of order tag could be
> added to my 'ignore' list and all worked out.  But what I want to
> know is if there is another way to handle the 'out of order'
> error - so if the tag that is out of order cannot be added to the
> 'ignore' set I can still operate?

Bruce,

I have been faced with a similar problem in the past with libtiff, and my
solution was to implement my own warning function.  In it I examined the
message, and ignored a set of messages that I didn't want to show to the user.

This is a flexible approach, but you are forced to hard code substrings to
use in recognising warnings you want to ignore.  

Best regards,

---------------------------------------+--------------------------------------
I set the clouds in motion - turned up | Frank Warmerdam, warmerda@home.com
light and sound - activate the windows | http://members.home.com/warmerda
and watch the world go round - Rush    | Geospatial Programmer for Rent


AWARE [SYSTEMS]		Imaging expertise for the Delphi developer
		TIFF and LibTiff Mailing List Archive
	LibTiff Mailing List TIFF and LibTiff Mailing List Archive December 1999 Previous Thread Next Thread Previous by Thread Next by Thread Previous by Date Next by Date Contact The TIFF Mailing List Homepage This list is run by Frank Warmerdam Archive maintained by AWare Systems	Thread 1999.12.10 14:19 "TIFF tags out of order", by Bruce Cameron 1999.12.10 14:56 "Re: TIFF tags out of order", by Frank Warmerdam 1999.12.10 14:56 "Re: TIFF tags out of order", by Frank Warmerdam Bruce Cameron wrote: > > This is a question that requires a bit of explanation. I am on NT using > the TIFF library [in C++]. So, if there is an error, there is a dialog > box brought up and the program waits for user reply. This is fine for > interactive use, but not for workhorse programs that run at night. > Fine, > the library has a command for turning off dialog and writing to a log > file. But I wanted to see any 'odd' such messages and stop the off > line processing. But some of the messages I know for the current set > of images are unimportant - so I added the 'TIFFReassignTagToIgnore' > function [I am responsible for putting that into the last library > release]. This lets the user specify tags that he/she knows will > cause the dialog, set them to be ignored so no diallg, but if another > error the dialog will come up and user be alerted. Now I find some > files that have 'TIFF tags out of order'. I used tiffinfo to find > out what, and in fact in this case the out of order tag could be > added to my 'ignore' list and all worked out. But what I want to > know is if there is another way to handle the 'out of order' > error - so if the tag that is out of order cannot be added to the > 'ignore' set I can still operate? Bruce, I have been faced with a similar problem in the past with libtiff, and my solution was to implement my own warning function. In it I examined the message, and ignored a set of messages that I didn't want to show to the user. This is a flexible approach, but you are forced to hard code substrings to use in recognising warnings you want to ignore. Best regards, ---------------------------------------+-------------------------------------- I set the clouds in motion - turned up \| Frank Warmerdam, warmerda@home.com light and sound - activate the windows \| http://members.home.com/warmerda and watch the world go round - Rush \| Geospatial Programmer for Rent

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1999.12.10 14:56 "Re: TIFF tags out of order", by Frank Warmerdam