How to convert QString to QImage

[anda_skoa]

It is the same code you already have, just using a QImage instead of QBitmap.

QPainter works on any QPaintDevice, QBitmap and QImage are two implementations of that interface.

Cheers,
_

[gunturrohith]

Hi anda_skoa,

I tried this one with the following code.

QString filename = "sample.bmp";
QString format = "bmp";
QImage img(384,60,QImage::format_MonoLSB);
img.fill(Qt::white);
QPainter painter(&img);
QFont serifFont("Times", 18, QFont::Bold);
painter.setFont(serifFont);
painter.setPen(Qt::black);
QStaticText strText(txtStr);
strText.setTextFormat(Qt::RichText);
painter.drawStaticText(10,0,strText);
painter.save();
img.save(filename,format.toAscii());
painter.restore();

I used QImage in place of QBitmap .But still it is not working in device.
I think QPainter is gui class so that it is not working.
so can you provide another alternative solution.

[anda_skoa]

What does it mean "not working"?
Have you changed your application object to QCoreApplication?

Cheers,
_

[gunturrohith]

Hi anda_skoa,

I changed my application object to QCoreApplication.I didn't get any error in compile time,
but i am getting error in run time like this

QScreenLinuxFb::connect: No such file or directory
Error opening framebuffer device /dev/fb0
QScreenLinuxFb::connect: No such file or directory
Error opening framebuffer device /dev/fb0
QScreenLinuxFb::connect: No such file or directory
Error opening framebuffer device /dev/fb0
QScreenLinuxFb::connect: No such file or directory
Error opening framebuffer device /dev/fb0

our device don't have any LCD .Can you provide any solution

[anda_skoa]

Very strange, the QCoreApplication does not have code to load any QPA plugin, only QGuiApplication does.

Still, you could try providing the qminimal QPA plugin and using the -platform commandline switch to load it explicitly.

Cheers,
_

[gunturrohith]

Hi anda_skoa,

we are not using Qt-5,we are using Qt-4.7.4

[anda_skoa]

I see.

You'll have to check where the request for the framebuffer connection comes from, QImage quite certainly doesn't need it.

Alternatively you could look into providing a virtual framebuffer that the application would then work with, or a virtual X server, e.g. Xvfb

Cheers,
_

[gunturrohith]

Hi anda_skoa,

we are getting problem with QPainter.
Can you provide any link or documentation for Xvfb installation or configuration