[Qt-interest] QPainter segmentation fault on Linux

[Christoph Bartoschek]

Davide wrote:

> On Thu, Feb 19, 2009 at 6:10 PM, Srdjan Todorovic
> <todorovic.s at googlemail.com> wrote:
>> I'd say it's still a bad idea, probably a bad design approach. Wont it
>> be better to just keep a pointer member and then alloc your QImage
>> where you assign it?
> 
> First of all thanks for your hints, I changed my program in the way
> you suggest me.
> 
> Unfortunately my problems on a Linux system still remain.
> Does anybody have an idea of what can cause a Segmentation Fault error
> when I call drawRect method only on a Linux system and not in Windows?
> 
> This is my code:
>    qImage = new QImage((u8*)Image.data, Image.width, Image.height,
> QImage::Format_RGB32);
>    QPainter p;
>    p.begin(qImage);
>    p.setPen((Qt::GlobalColor)(Qt::cyan));
>    p.drawRect(2, 2, 20, 20);   //  -->   Segmentation Fault
>    p.end();
> 
> Thanks

Run your program with valgrind. Compile a debug version and then just run:

valgrind your_prog

Then you will see what you do wrong.

Christoph