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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

or

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

Best regards,

Michel
>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
>
>Thanks,
>David@kalos-inc.com

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