real time data display

[wysota]

Just a side note - this code is not safe as it references a pixmap from a worker thread. It will probably fail sooner or later, especially on X11 systems.

[honestapple]

Hi, wysota
I had met the same problems as hammer256. I am working on Windows XP. I have some questions.
1. Why is it not safe to reference pixmap from worker thread? Would this cause big porblems on Windows.
2. Please give me some advice if you have better solution.

[wysota]

1. Why is it not safe to reference pixmap from worker thread?

Because QPixmap could potentially access GUI data.

Would this cause big porblems on Windows.

It might crash your app.

2. Please give me some advice if you have better solution.

Use a shared QImage instance and generate a pixmap from it in the main thread.

[honestapple]

I knew that there was a pwt library which is used to plot. Which is better between the pwt library and the solution you advised？

[wysota]

I don't know what pwt is. I only know Qwt and it is hard to compare a home crafted solution with a library that has been on the market for years.