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Date Posted: 19:30:16 09/08/03 Mon
Author: Michel
Subject: Re: IntraWeb 5.1 and Envision 2.0 - Cannot assign a TDibGraphic to a TJPEGImage
In reply to: David W 's message, "Re: IntraWeb 5.1 and Envision 2.0 - Cannot assign a TDibGraphic to a TJPEGImage" on 12:34:03 09/05/03 Fri


Hi Dave,

I would not use UnregisterGraphicClass unless any registered Envision classes unless you really have to. Do you try converting to a TBitmap explicitely, or using SaveToStream/LoadFromStream?

As far as using in a DLL, I don't see any problems.

Best regards,

Michel

>Michel-
>
>I am trying to use the TThumbnailCreator class within
>a DataModule. Could you please explain where and how
>I would use the TPicture.UnregisterGraphicClass method
>to turn on and off the support for Envision?
>
>Also, could I use Envision in a DLL to do what I want
>or would that also cause problems for IntraWeb?
>
>TIA
>
>-DaveW
>
>>
>>Hi Dave,
>>
>>Yes, you can use TPicture.UnregisterGraphicClass.
>>
>>Best regards,
>>
>>Michel
>>
>>>Michel-
>>>
>>>Is there a way I register and then unregister the JPG
>>>format on the fly? Then I could only use it when I
>>>need it and not mess with the way IW does it's thing
>>>(it's a black box!).
>>>
>>>Thanks!
>>>
>>>-Dave
>>>
>>>>
>>>>Hi David,
>>>>
>>>>I have not worked with IntraWeb, so I can't give you
>>>>specific advise.
>>>>
>>>>There error you are getting is resulting from
>>>>something like,
>>>>
>>>>JpegImage.Assign(DibGraphic)
>>>>
>>>>which ends up calling
>>>>
>>>>TDibGraphic.AssignTo
>>>>
>>>>A TDibGraphic can be assigned to a TBitmap, but not
>a
>>>>TJpegImage. I did some research on this, and the
>>>>TJpegImage is a read-only type graphic, ie, it does
>>>>not have Canvas so the AssignTo implementation can
>>not
>>>>be straight forward. One way could be to save to a
>>>>JPEG stream then using LoadFromStream but this is
>not
>>>>elegant.
>>>>
>>>>I don't know how the IW image control work. One
>>>>possible workaround is to create a temporary TBitmap
>>>>and assign the TDibGraphic to the TBitmap. I assume
>>>>that the IW controls will work with a TBitmap.
>>>>
>>>>Best regards,
>>>>
>>>>Michel
>>>>
>>>>>Does Envision 2.0 work with IntraWeb 5.1? I get
>the
>>>>>error message "Cannot assign a TDibGraphic to a
>>>>>TJPEGImage" in the EnDiGrph.pas (line 1256) unit
>>when
>>>>>I use any of the IW Image controls.

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