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July 1998
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1998.07.30 13:24 "Re: Appending images", by Geoff Vandegrift
Bruno,
Upon a quick perusal of the libtiff code, there appears to be a
problem/bug in tif_win32.c. On or around line 173, you have
case O_RDWR|O_CREAT:
dwMode = CREATE_NEW;
break;
This appears to be an incorrect "translation" of the standard file
constants (O_XXXXX). In checking through the on-line help, it looks
like it would be more appropriate to replace the above code snippet with
case O_RDWR|O_CREAT:
dwMode = OPEN_ALWAYS;
break;
I haven't tried this change myself (I've never tried to append to a
file), so you might double check that OPEN_ALWAYS is the right
parameter.
Geoff Vandegrift
Applications Engineer
Hitachi Software Engineering America, Ltd.
> -----Original Message-----
> From: bruno Ledoux [SMTP:bruno_ledoux@binuscan.com]
> Sent: Wednesday, July 29, 1998 10:00 AM
> To: tiff@sgi.com
> Subject: Appending images
>
> Hi,
>
> I would like to append images to an existing TIFF file , I tried to
> open
> the file in append mode with :
> tif = TIFFOpen("myfile.tif","a");
> but it fails because the Windows CreateFile function returns an error
> as
> the file already exists !!!
>
> Has anyone got any idea ?
>
> PS: I'm using tifflib v3.4 beta under Windows95.
>
> Gratefully,
>
> Bruno