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Bug? LoadImage() causes program to crash
Posted: Mon Feb 15, 2010 7:49 pm
by c4s
Wow, I needed at least 2 hours (because first I was on a wrong track) to reproduce the error I get with this code:
Code: Select all
#File = "C:\image.jpg" ; I'm using this: http://em.q-soft.ch/filestore/a4/hyrC4BGV1j.image.jpg._
; Insert those lines to get the 2. crash
;UseJPEGImageDecoder()
;UsePNGImageDecoder()
UseTGAImageDecoder()
UseJPEG2000ImageDecoder()
; Make a backup
CopyFile(#File, #File + ".bak")
; Load normal image
ImageID = LoadImage(#PB_Any, #File) ; <- 1. Crash: "Read error at address 12813"
If ImageID <> 0
FreeImage(ImageID)
Debug "Load normal - Ok"
Else
Debug "Load normal - Error"
EndIf
; Make image corrupt
FileID = OpenFile(#PB_Any, #File)
If FileID <> 0
FileSeek(FileID, 23)
WriteByte(FileID, $F9) ; (Wrong marker size, correct is $6E)
CloseFile(FileID)
EndIf
; Load corrupt image
ImageID = LoadImage(#PB_Any, #File) ; <- 2. Crash: "Read error at address 12813"
If ImageID <> 0
FreeImage(ImageID)
Debug "Load corrupt - Ok"
Else
Debug "Load corrupt - Error"
EndIf
; Backup - you won't get here anyway because of the crashs ;)
DeleteFile(#File)
RenameFile(#File + ".bak", #File)
The following normal image that I corrupt with the code causes the crash in my program:
http://em.q-soft.ch/filestore/a4/hyrC4BGV1j.image.jpg._
It's possible to create the crash in two ways: By using a combination of image decoders and by corrupting the image.
Anyway I learned to post it in the discussion first because maybe I mixed something up again.
Re: Bug? LoadImage() causes program to crash
Posted: Mon Feb 15, 2010 9:58 pm
by netmaestro
Code: Select all
#File = "d:\image.jpg" ; I'm using this: http://em.q-soft.ch/filestore/a4/hyrC4BGV1j.image.jpg._
; Insert those lines to get the 2. crash
UseJPEGImageDecoder()
UsePNGImageDecoder()
UseTGAImageDecoder()
UseJPEG2000ImageDecoder()
; Make a backup
CopyFile(#File, #File + ".bak")
; Load normal image
ImageID = LoadImage(#PB_Any, #File) ; <- 1. Crash: "Read error at address 12813"
If ImageID <> 0
FreeImage(ImageID)
Debug "Load normal - Ok"
Else
Debug "Load normal - Error"
EndIf
DeleteFile(#File)
RenameFile(#File + ".bak", #File)
Your first crash is caused by the decoder not being loaded, the second because you deliberately corrupt the file. With the correct decoder loaded, regardless of how many other decoders are loaded as well, the program works fine. The "crashes" are only debugger stops, if you run without debugger there is no crash, it just doesn't work. All this is to be expected.
Re: Bug? LoadImage() causes program to crash
Posted: Mon Feb 15, 2010 10:36 pm
by c4s
netmaestro wrote:Your first crash is caused by the decoder not being loaded, the second because you deliberately corrupt the file. With the correct decoder loaded, regardless of how many other decoders are loaded as well, the program works fine. The "crashes" are only debugger stops, if you run without debugger there is no crash, it just doesn't work. All this is to be expected.
That's the point: It isn't a debugger stop. The executable immediately closes itself so as I wrote in my example code you won't come to the backup.
Sorry but did you even tried the code with this image?
If the image is corrupt I should get a #False return value but not a complete crash.
Also I don't understand why I should get a warning if one image decoder isn't loaded. Just comment every decoder out and no compiler warning is comming as expected but a #False return value...
Re: Bug? LoadImage() causes program to crash
Posted: Mon Feb 15, 2010 10:47 pm
by netmaestro
Don't worry about my opinion, it doesn't count for anything. The team will look at it and if they see something to fix, it'll get fixed.
Re: Bug? LoadImage() causes program to crash
Posted: Mon Feb 15, 2010 10:56 pm
by c4s
Sorry, for being harsh but you know...I spend the whole day searching for the cause. And to me it looks like a bigger problem... So overall I'm getting a bit upset.
Edit:
Should I create a new message in the bug forum?
