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Date Posted: 15:16:48 09/17/03 Wed
Author: Stampfli Heinz
Subject: Re: ImageScrollBox and TJpegImage
In reply to: Michel 's message, "Re: ImageScrollBox and TJpegImage" on 20:02:55 09/16/03 Tue

Hi Michel

When I try to compile it. It gives an Error:
"Incompatible types: TDipGraphic and TJpegImage"

I think it is a conversion problem between tdipgraphic and tjpegimage. I have rewritten the Function ExtractThumbnailJpeg() that it uses TJpegGraphic within the Library EnJpgGr. When I try to load, nothing happens (no error).


What is the diffrent from TDipGraphic and TGraphic. Can I convert them from one to the other?

When I load a JPEG into a TImage I also can't assign it to a TImageScrollBox.

Without Envision (only with the unit jpeg) dEXIF does work together with TImage to load the extracted Thumbnail.

I would program the whole Application with Envision Library.

Kind Regards
Heinz



>Hi Heinz,
>
>I have not used dEXIF so I may need more information.
>
>Does,
>
>function TImgData.ExtractThumbnailJpeg: TJpegImage;
>
>work properly?
>
>You can try this,
>
>var
> JpegImage : TJpegImage;
>begin
> ...
> JpegImage := ImgData.ExtractThumbnailJpeg;
> ImageScrollBox.Graphic := JpegImage;
> JpegImage.Free;
> ...
>end;
>
>Do you get any error message?
>
>Best regards,
>
>Michel
>
>>Hello Michel
>>
>>This kind of Code I have already tried.
>>I would like to extract the thumbnail with dEXIF
>>(<a rel=nofollow target=_blank href="http://mcguirez.homestead.com/downloads.html)">http://mcguirez.homestead.com/downloads.html)</a> and
>>assign it to the imagescrollbox.
>>
>>In dEXIF it uses the library jpeg. I have also
>>rewritten the function to use TJpegGraphic from
>>EnJpgGr. It doesn't work, too.
>>
>>The Function in dEXIF that extract the Jpeg Thumbnail:
>>function TImgData.ExtractThumbnailJpeg: TJpegImage;
>>var ti:TJPEGImage;
>> x:TStringStream;
>> tb:string;
>>begin
>> result := nil;
>> if HasThumbnail and (ExifObj.ThumbType =
>>JPEG_COMP_TYPE) then
>> begin
>> tb := ExtractThumbnailBuffer();
>> if (tb = '') then
>> exit;
>> x := TStringStream.Create(tb);
>> ti := TJPEGImage.Create;
>> x.Seek(0,soFromBeginning);
>> ti.LoadFromStream(x);
>> x.Free;
>> result := ti;
>> end;
>>end;
>>
>>Have you any other advice.
>>
>>Kind Regards
>>Heinz
>>
>>
>>>
>>>Hi Heinz,
>>>
>>>Try this,
>>>
>>>ImageScrollBox.Graphic.Assign(JpegImage);
>>>ImageScrollBox.Redraw(True);
>>>
>>>Best regards,
>>>
>>>Michel
>>>
>>>>Hello
>>>>
>>>>How do I assign a TJpegImage into a ImageScrollBox
>>>>with Envision 2.0.1. Can you give me an example?
>>>>
>>>>Kind Regards
>>>>Heinz Stampfli

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