Crash in function: QImageData * QImageData::create(const QSize &size, QImage::Format format)

[JonB]

@Wenchi
So the trace shows you clicked a button and it called your CFuncToolSlamWidget::on_btn_add_clicked(). At line #263 that calls QImageReader::read(). So let's see the code around (i.e. leading up to) that line #263. We are probably particularly interested in the lifetime of the QImage you are using.

[Wenchi]

@JonB
I have already uploaded the code of function
void CFuncToolSlamWidget::on_btn_add_clicked()
to the description of the question.
And the crash line is
qImaggbk = reader.read();
Since the crash doesn't appear necessarily, I couldn't figure out why it crashed.

[JonB]

@Wenchi
Then it looks like QImageReader::read() does not like the content of the .png file you are trying to load. Does it happen depending on which file is chosen? Try the code with a specified filename in some standalone code outside of your project and see how it goes?

[JoeCFD]

Try to use another tool to load your image and see if the file is corrupt or has some other issues. It may be a good idea to check if read() fails or not all the time like the following:

QImage icon(64, 64, QImage::Format_RGB32);
QImageReader reader("icon_64x64.bmp");
if (reader.read(&icon)) {
    // Display icon
}

the sample code is from here:
https://doc.qt.io/qt-5/qimagereader.html#read-1

[Wenchi]

@JonB
I've tried that before. I coded while{...} to load the picture(png), which had caused crash, for over 1 million times, but the crash didn't appear.

[Wenchi]

@JoeCFD
Thank you for your reply!
Using another tool to load image can be a way to avoid the crash, but in my situstion, the crash could appear not only in QImageReader.read() but also in several other code, such as Qlist<MyWidget>.push_back() or QStackWidget.setCurrentIndex() and so on.

[Christian Ehrlicher]

@Wenchi said in Crash in function: QImageData * QImageData::create(const QSize &size, QImage::Format format):

the crash could appear not only in QImageReader.read() but also in several other code, such as Qlist<MyWidget>.push_back() or QStackWidget.setCurrentIndex() and so on.

Then you should fix your code.

[Wenchi]

please help！I'll lose my job if I can't fix this bug. crying

[JonB]

@Wenchi
How do you expect anybody to offer any further help, if your code is crashing in various places?

[Wenchi]

@JonB
Although the code is crashing in various places, the crash point is always the same:

QImageData * QImageData::create(const QSize &size, QImage::Format format) )

by the way, I'm fired. ready to get a new start

[JonB]

@Wenchi said in Crash in function: QImageData * QImageData::create(const QSize &size, QImage::Format format):

Although the code is crashing in various places, but the crash point is always the same:

But that is likely --- or just as possible --- indicating you have a problem elsewhere which only shows up here, such as corrupted/misallocated memory? How else would you explain it "crashing" in e.g. QList<MyWidget>.push_back()?

by the way, I'm fired. ready to get a new start

I am sorry to hear that, good luck for future.