Problem with QImage and QPixmap
Hey! I am developing application which is using OpenCV for capturing and processing images from camera and Qt for displaying them.
I don't know exactly why but application suddenly started to crash without any traceback. I was developing it on WinXp with python27. It worked fine on Windows 7 and python26 but after installing python27 on that computer it started to crash with both pythons.
I was able to trace and extract code which causes the crash:
@from PySide.QtGui import QApplication,QImage, QPixmap
app = QApplication("test")
q_image = QImage("\255\0\0\0"(wh),
This is not working at all (crashes on q_image.save()). When I change (w,h) to (200,200) it is working ok, but resulting images are not something that I would expect - image data is corrupted. This application crashes both with PySide and PyQt4.
I am very new to Qt so there might be something that I am not doing, or doing it wrong. But it seems to me like a serious bug.
Please help me, because I don't know how to handle that problem.
Try changing line 4 to this:
data = "\255\0\0\0"(wh)
q_image = QImage(data,
Thanks, it worked! I was using img.tostring() (from OpenCV), that is why I didn't think that it is going to be garbage collected and I didn't suspect that Qt is so smart to use the same memory instead of allocating and copying. Thanks again!