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Bugs of QImage?

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stereoMatching

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Thursday, June 21st 2012, 12:26pm

Bugs of QImage?

My program always crash when the format of the QImage is QImage::Format_Indexed8
Other format would not crash but
QImage::Format_Indexed8


example one

Source code

 
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    QImage src(2, 2, QImage::Format_Indexed8);
    QImage src2 = src.copy();
    std::cout<<std::boolalpha<<(src == src2)<<std::endl;


example two

Source code

 
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QImage src("../GIL_with_Qt/images_00/lena/lena.jpg");
src = src.convertToFormat(QImage::Format_Indexed8);
QImage dst(src.size(), src.format());       
 
dst.save("E:/lena/lena_Format_Indexed8.jpg");


compiler : vc2010(32bits)
os : win7 64bits
qt ver : Qt4.8.1

Thank you very much

ps : Please don't care about the codes make sense or not, this is not the point of this post

Amleto

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Thursday, June 21st 2012, 4:07pm

what is the exception/error?
what is the callstack?
what is the line of code that causes the problem?
If you have a problem, CUT and PASTE your code. Do not retype or simplify it. Give a COMPLETE and COMPILABLE example of your problem. Otherwise we are all guessing the problem from a fabrication where relevant details are often missing.

Amleto

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Thursday, June 21st 2012, 4:39pm

additionally, are yuo running debug/release? can you show which qt dlls/shared library versions you are linking with?
If you have a problem, CUT and PASTE your code. Do not retype or simplify it. Give a COMPLETE and COMPILABLE example of your problem. Otherwise we are all guessing the problem from a fabrication where relevant details are often missing.

stereoMatching

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Saturday, June 23rd 2012, 11:31am

> what is the line of code that causes the problem?
example 1 :
http://pastebin.com/RKQYkvkf

example 2 :
http://pastebin.com/X4Vfp3LF

>what is the exception/error?
both of them give me the same error messages

https://152f08cb-a-62cb3a1a-s-sites.goog…&attredirects=0

>are yuo running debug/release?
debug(release mode also crash)

>what is the callstack?
How could I observe the callstack under QtCreator?
Besides, this is nothing like the bug of my program but Qt4.8.1
The codes are 3~4 lines, they are all under "main()"

>dlls/shared library
I think it would be the dll of Qt4.8.1.Since there are only
one environment path "C:\Qt\4.8.1\bin;" which contains the dll of Qt
on my pc.

Thanks a lot

ps : when I wrap the codes with code tags or try to show the image by the img tags
the results are pretty weird, so I present the codes and the link of the image
without those tags,sorry for the inconvenient.

This post has been edited 4 times, last edit by "stereoMatching" (Jun 23rd 2012, 11:56am)

Amleto

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Saturday, June 23rd 2012, 12:14pm

>what is the callstack?
How could I observe the callstack under QtCreator?

not sure how well creator works. With studio it's just a case of looking at the stack window http://wwwimages.adobe.com/www.adobe.com…tudio/fig06.jpg

It does look very bug-like, though.
If you have a problem, CUT and PASTE your code. Do not retype or simplify it. Give a COMPLETE and COMPILABLE example of your problem. Otherwise we are all guessing the problem from a fabrication where relevant details are often missing.

Amleto

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Saturday, June 23rd 2012, 12:16pm

are you meant to make QImage before qapp??
If you have a problem, CUT and PASTE your code. Do not retype or simplify it. Give a COMPLETE and COMPILABLE example of your problem. Otherwise we are all guessing the problem from a fabrication where relevant details are often missing.

Amleto

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Saturday, June 23rd 2012, 1:17pm

If I ran your example and get the same problem.

not sure why it is - it doesn't look nice!
If you have a problem, CUT and PASTE your code. Do not retype or simplify it. Give a COMPLETE and COMPILABLE example of your problem. Otherwise we are all guessing the problem from a fabrication where relevant details are often missing.

stereoMatching

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Tuesday, June 26th 2012, 10:05pm

>
are you meant to make QImage before qapp??
yes, even with qapp it is still crash.

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