Printing QWidget window using python

khakhil

No, I do not want screen shot of window.

I need to send it to printer. I want to print the current widget as it is.

It is sending to printer, but the output is blank. How can I get widget/window to print ?

mrjj

@khakhil
but if u dont want screen shot of the labels (and print that),
how do you mean to print them?
a Label is just some text, so you might as well just print it yourself?

Currently you are only printing the document. so unless you insert into that, its
not printed.

in c++ you can draw text to printer like this
QPrinter printer(QPrinter::HighResolution);
QPainter painter;
painter.begin(&printer);
painter.drawText(xx)
...
http://doc.qt.io/qt-5/printing.html

is it what you want?
a Label cannot just print it self
but you can ask it to draw to the painter
with the render function.
http://doc.qt.io/qt-5/qwidget.html#render

khakhil

No, I do not want to print only just labels. I need to print whole window. Please see following image.

http://theweblogics.com/screen.png

On click of print button, I need to get this window by printer.

mrjj

@khakhil
im confused.
so what is wrong with
http://stackoverflow.com/questions/10705712/screenshot-of-a-window-using-python
take image of whole thing and print that image??

khakhil

thanks @mrjj
i follow the link you have sent to me

(http://stackoverflow.com/questions/10705712/screenshot-of-a-window-using-python)

It works, now i want to get that image/screenshot from directory and send it to printer.
please help.

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 :)