Hi,

In a table I have a graphic field. In the Database Desktop I import a
bitmap. That works fine and I can show the bitmap in my application. But if
I try to "export" the bitmap in de Database Desktop then the resulting
bitmap is empty. If I try this in code in my own application the result is
the same. Has anyone seen this strange behaviour? I use V3.

Greetings,
Ronald van der Pas

Ronald,

<< In a table I have a graphic field. In the Database Desktop I import a
bitmap. That works fine and I can show the bitmap in my application. But if
I try to "export" the bitmap in de Database Desktop then the resulting
bitmap is empty. If I try this in code in my own application the result is
the same. Has anyone seen this strange behaviour? I use V3. >>

I tried it here with 3.30 and it seems to work just fine.  Are you possibly
using an earlier version of 3.x ?

--
Tim Young
Elevate Software
www.elevatesoft.com

Now I use version 3.26
Do you advice to upgade?

"Tim Young [Elevate Software]" <timyoung@elevatesoft.com> schreef in bericht
news:B5A3EB59-AFE6-4D05-97AE-F80CF792C6C6@news.elevatesoft.com...
> Ronald,
>
> << In a table I have a graphic field. In the Database Desktop I import a
> bitmap. That works fine and I can show the bitmap in my application. But
> if I try to "export" the bitmap in de Database Desktop then the resulting
> bitmap is empty. If I try this in code in my own application the result is
> the same. Has anyone seen this strange behaviour? I use V3. >>
>
> I tried it here with 3.30 and it seems to work just fine.  Are you
> possibly using an earlier version of 3.x ?
>
> --
> Tim Young
> Elevate Software
> www.elevatesoft.com
>
>

Ronald,

<< Now I use version 3.26 Do you advice to upgade? >>

Yes.  Either that or just use the 3.30 DBSYS instead - it will work with the
3.26 tables okay.

--
Tim Young
Elevate Software
www.elevatesoft.com

Hi

I have the same problem in that when saving (Exporting) a Graphic BMP field as a BMP, it does not open in Irfanview (Can't read file header !  
Unknown file format).

I tried this using the DBYSY utility that comes with DBISAM version 4.22

When testing this you need to use a utility other than DBSYS to try and read the EXPORTED BMP file.

Can you please test and advise.

Thanks
Jim

Jim,

<< I have the same problem in that when saving (Exporting) a Graphic BMP
field as a BMP, it does not open in Irfanview (Can't read file header !
Unknown file format).

I tried this using the DBYSY utility that comes with DBISAM version 4.22

When testing this you need to use a utility other than DBSYS to try and
read the EXPORTED BMP file. >>

Where did the bitmap originally come from ?  IOW, how was it originally
added to the DBISAM table ?  DBISAM performs no translation on the actual
contents of the BLOB field, therefore what is exported will be exactly what
was put in originally.

--
Tim Young
Elevate Software
www.elevatesoft.com

Tim


Exactly what I can't remember but there's an itch at the back of my mind about this. Without looking at the code I presume DBSys uses a stream to save it to file? My memory says that in one app I had to use a stringlist to save to file otherwise the graphic wasn't recognised. I can't be anymore definite than that but I do remember a problem.

Roy Lambert

The Bitmap was added to the DBISAM table via the utility DBSYS that you
supply.
I have tried this with several different BMP files !

The BLOB field has a "Data Type" of GRAPHIC.

If you actually try to add a valid BMP to a DBISAM table field with a Data
Type of GRAPHIC,
using the DBSYS utility
then try to save it via the EXPORT utility, the BMP is corrupted.

Don't take my word for this.
Try it yourself.
It will only take you a couple of minutes,
and you will see that there is indeed a problem.

Regards,
Jim


"Tim Young [Elevate Software]" <timyoung@elevatesoft.com> wrote in message
news:03B44A2C-6AB6-4687-B113-22887028434D@news.elevatesoft.com...
> Jim,
>
> << I have the same problem in that when saving (Exporting) a Graphic BMP
> field as a BMP, it does not open in Irfanview (Can't read file header !
> Unknown file format).
>
> I tried this using the DBYSY utility that comes with DBISAM version 4.22
>
> When testing this you need to use a utility other than DBSYS to try and
> read the EXPORTED BMP file. >>
>
> Where did the bitmap originally come from ?  IOW, how was it originally
> added to the DBISAM table ?  DBISAM performs no translation on the actual
> contents of the BLOB field, therefore what is exported will be exactly
> what was put in originally.
>
> --
> Tim Young
> Elevate Software
> www.elevatesoft.com
>

Jim,

<< The Bitmap was added to the DBISAM table via the utility DBSYS that you
supply. I have tried this with several different BMP files !

The BLOB field has a "Data Type" of GRAPHIC.

If you actually try to add a valid BMP to a DBISAM table field with a Data
Type of GRAPHIC, using the DBSYS utilitythen try to save it via the EXPORT
utility, the BMP is corrupted. >>

You're correct, it's the TBlobField handling - it's inserting a Paradox
graphic header in the bitmaps when assigning a TGraphic field a bitmap.
I'll make sure this is fixed in the next build.

--
Tim Young
Elevate Software
www.elevatesoft.com