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

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.