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Date Posted: 06:37:11 09/03/02 Tue
Author: Michel
Subject: Re: Tiff image in Blob fields
In reply to: MageX 's message, "Tiff image in Blob fields" on 10:52:22 08/30/02 Fri

Hi David,

It seems like you saving a tiff stream, but then trying to load it as a BMP stream.

There are two things you can do,

Store the file extension in the database, and use the extension to determine the type of stream using EnDiGrph.FindDibGraphicClass


Use version 2 and use the function EnDiGrph.GuessDibGraphicClass to determine the type of graphic from the stream itself.

Best regards,

>Someone please correct me if I wrong here. All the
>info I can get the better. :)
>I am using Interbase. I have a field called IMAGE of
>type Blob, by default this is a subtype 0 seg 80.
>I also am using TTiffGraphic(Envision) and TStreams to
>move the object around. I create the stream, and
>assign the object into it. The stream is associated
>with the field.
>When I goto save it, I get Not a valid Bitmap image
>(or something similiar to that).
>IF I leave the image as a bitmap, all works well. I
>can't leave it as a bitmap though because of the size,
>I mean, I could, but it is a waste of space and
>eventually would clean out the extra drive space and
>would also be slow. Tiff is a proper choice for me
>since all my images are BW (and nothing special).
>I don't believe it to be a Database field problem
>since I really only have three choices and I feel that
>'subtype 0' which stores raw binary data is the
>correct type. Other is user defined and subtype 1 is
>for text blob data.
>Please help while I still have hair! :P

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