Printing QWidget window using python

[mrjj]

@khakhil
HI
you will need a way to select real printer
then load the image from file
and draw onto a painter connected to the selected printer.

try to play around with this sample
http://stackoverflow.com/questions/8193920/print-a-text-through-a-printer-using-pyqt4
its with preview and all so maybe over the top

here is c++ function that grabs screenshot and print it.
(thx to @Ni-Sumi)

void MainWindow::printPage() {
  QPixmap pix = QPixmap::grabWindow(QApplication::desktop()->winId());
  QPrinter printer(QPrinter::HighResolution);
  printer.setOrientation(QPrinter::Landscape);
  QPainter painter;
  painter.begin(&printer);
  double xscale = printer.pageRect().width() / double(pix.width());
  double yscale = printer.pageRect().height() / double(pix.height());
  double scale = qMin(xscale, yscale);
  painter.translate(printer.paperRect().x() + printer.pageRect().width() / 2,
                    printer.paperRect().y() + printer.pageRect().height() / 2);
  painter.scale(scale, scale);
  painter.translate(-width() / 2, -height() / 2);
  painter.drawPixmap(0, 0, pix);
  painter.end();
}

I assume u can read enough to translate to py. :)

[khakhil]

@mrjj

The link http://stackoverflow.com/questions/8193920/print-a-text-through-a-printer-using-pyqt4
is very helpful. I solved 90% of my problem.
now, the problem is that as i select the image to print, the printer not getting the image.
instead of image it takes "ÿØÿà" and prints it.

what i do?

[mrjj]

@khakhil
it looks like it prints the pointer?
did you use painter.drawPixmap ?

[khakhil]

@mrjj
not working :( :(

[mrjj]

@khakhil said:
still getting?

"ÿØÿà

can you post the code. maybe someone can spot the issue :)

[khakhil]

@mrjj

      if info.completeSuffix() == 'html':
           self.editor.setHtml(text)
       else:
           self.editor.setPlainText(text)

is there any way like this for .jpg or .tif format ???

for the same issue i am also trying the following as @mrjj suggest

class Window(QtGui.QWidget):
  def __init__(self):
    super(Window, self).__init__()
    self._new_window = None
    
    printer = QtGui.QPrinter()
    Pixmap = QtGui.QPixmap()
    pix = QPixmap.grabWindow(QApplication.desktop().winId())
    printer.setOrientation(printer.Landscape)
    Painter= QtGui.QPainter() 
    Painter.begin(printer)
    xscale = printer.pageRect().width() / (pix.width())
    yscale = printer.pageRect().height() / (pix.height())
    scale = qmin(xscale, yscale)
    Painter.translate(printer.paperRect().x() + printer.pageRect().width() / 2,
                      printer.paperRect().y() + printer.pageRect().height() / 2);
    Painter.scale(scale, scale)
    Painter.translate(-width() / 2, -height() / 2)
    Painter.drawPixmap(0, 0, pix)
    Painter.end()

but not succeed.

[mrjj]

so it just print "ÿØÿà on piece of paper?
or?

[khakhil]

@mrjj
yes.. it is printing sometimes II* and sometimes "ÿØÿà" .

[mrjj]

@khakhil said:

def init(self):

can you try to move the code to a button? ( to a clicked slot)

I assume
def init(self):
is the constructor?
Might not be the best spot as object might not be fully shown or
the (QApplication.desktop().winId()) dont return what we think.

Could u also add a Painter.drawText(200,200, "hello") and see if that comes.?

[khakhil]

@mrjj
hey thanks..
this code is working properly.

 printer = QtGui.QPrinter()
    Pixmap = QtGui.QPixmap() 
    pix= QPixmap.grabWindow(loginwindow.winId())
    Painter= QtGui.QPainter() 
    Painter.begin(printer)
    
    Painter.drawPixmap(50, 490, pix)
    Painter.end()        

It saves images every time i ran the code .
what should i do if i don't want to save it but directly print it????

[mrjj]

hi
it should print the image.
code looks ok.

could u try display the image in a label?
self.label.setPixmap(pix)

to see what u grab

[khakhil]

@mrjj
thank you so much for help !!
problem solved :) :)

printer = QtGui.QPrinter()
  Pixmap = QtGui.QPixmap() 
  pix= QPixmap.grabWindow(loginwindow.winId())
  Painter= QtGui.QPainter() 
  Painter.begin(printer)

  Painter.drawPixmap(50, 490, pix)
  Painter.end()      

same code works for grab screenshot and print it.

thanks @mrjj

[mrjj]

@khakhil
super! :)
as a little note.
If printer has high DPI, image might become really small.
if that happens u can use the scale function of the pixmap to make it bigger or
use the Painter.translate() as c++ sample showed :)

[khakhil]

thanks @mrjj
I wll try it later
you saved my life :)

[mrjj]

@khakhil
hehe super :)
Good work.
Im complete python noob but syntax is somewhat the same :)