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Date Posted: 02:22:02 08/04/03 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 13:49:13 08/03/03 Sun


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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