Project JEDI - Issue Tracker - JEDI VCL
Viewing Issue Advanced Details
6564 00 JVCL Components major always 2017-04-09 11:42 2019-03-20 08:55
resolved Daily / GIT  
none Daily / GIT  
0006564: JvDBImage shows "Bitmap image is not valid" to some kind of jpeg image.
Some kind of jpeg image does not has the "JFIF" or "Exif" signature at stream offset 6 as procedure GraphicSignaturesNeeded expected.
The attached picture is the header dump of the jpeg file. The jpeg picture is private so I can't upload it.
Simple workaround is to add:

    RegisterGraphicSignature([$FF, $D8], 0 , TJPEGImage);


procedure GraphicSignaturesNeeded;

But I think we should add file ending signature examination since a valid jpeg file is always ended with 0xFF, 0xD9. (According to [^]
png file icon file header.png [^] (42,399 bytes) 2017-04-09 11:42
jpg file icon header.jpg [^] (28,773 bytes) 2017-07-10 02:57
7z file icon JvDBImageInvalidImage.7z [^] (129,355 bytes) 2018-07-25 05:58
Issue History
2017-04-09 11:42 sender New Issue
2017-04-09 11:42 sender File Added: file header.png
2017-07-02 08:44 mh Note Added: 0021429
2017-07-10 02:57 sender File Added: header.jpg
2017-07-10 03:02 sender Note Added: 0021432
2018-07-18 15:55 obones Note Added: 0021526
2018-07-18 15:55 obones Status new => feedback
2018-07-25 05:58 sender File Added: JvDBImageInvalidImage.7z
2018-07-25 06:07 sender Note Added: 0021567
2018-07-26 11:07 obones Status feedback => acknowledged
2019-03-11 22:14 mh Note Added: 0021638
2019-03-15 06:35 sender Note Added: 0021649
2019-03-19 19:57 mh Note Added: 0021651
2019-03-20 08:55 obones Status acknowledged => resolved
2019-03-20 08:55 obones Fixed in Version => Daily / GIT
2019-03-20 08:55 obones Resolution open => fixed
2019-03-20 08:55 obones Assigned To => obones

2017-07-02 08:44   
1. can this particular JPEG file provided for further analysis?
2. what do other image processing applications say when you try to load this image in them?
2017-07-10 03:02   
I have uploaded the jpeg file, please check the attached file "header.jpg".

I have tried lots of graphic processing applications, including IrfanView,, GIMP, Corel PaintShop pro, Adobe Photoshop. They all can open this file without problem.
2018-07-18 15:55   
Could you check if the issue is still present in the latest GIT content? If yes, please provide the zipped sources of an application showing this.
2018-07-25 06:07   
The problem is still there.

I have uploaded demo source package which contains 2 demo programs. The one which includes my patched JvJVCLUtils.pas can show the jpeg file in mdb. The unpatched one will show "Unsupported stream format".

To use the demo program, just compile and run, then pressed the "open db" button.
2019-03-11 22:14   
So you know how to put your modification into a GitHub pull request? If yes, can you do this?
2019-03-15 06:35   
Pull request is created. Please check GitHub for it.
2019-03-19 19:57   
It already has been merged in, but I don't have permission to change the status of this mantis issue. Otherwise I would declare this as resolved. Thanks for creating the pull request.