@Qjay This may not help because I do not know quite how you would do this directly from Qt, but when we want to print a PDF under Windows we use the underlying Win32 function ShellExecute() (https://msdn.microsoft.com/en-us/library/windows/desktop/bb762153(v=vs.85).aspx) to go (effectively) ShellExecute("print", native-path-to-file), and let Windows shell sort it out. This is effectively the same as right-clicking on the file and picking the Print action. So you don't need to know anything about the actual process which does the printing, its arguments etc.

@M4RZB4Ni yes, that is normal. Printer have many more pixels. so image seem smaller. Read docs. they have example of scaling stuff. This sample takes snapshot and scales it. void MainWindow::printshot() { 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); // note uses the form width/height! use pix.h/w if random image painter.drawPixmap(0, 0, pix); painter.end(); }

Yes, the code you have there uses VT100 Escape Codes (note that \033 is the octal representation of character 27=escape. You could also use the hexadecimal \x1b instead), see http://en.wikipedia.org/wiki/ANSI_escape_code These require a terminal emulator that supports VT100, which almost all linux terminal emulators do. Windows Command Prompt doesn't support them by default, but at the bottom of https://docs.microsoft.com/en-us/windows/console/console-virtual-terminal-sequences there is some code that shows how to turn that on (it's only a few lines of additional code that you only need to run once at the beginning - I would put it into an #ifdef __WIN32 #endif for platform independence.) I haven't actually tried that though and I'm not sure on which versions of windows it works. Regarding python: python doesn't natively support VT100 either, but the colorama package https://pypi.org/project/colorama/ enables them (to my knowledge, it replaces the print or write methods with something that extracts the escape codes and does the manipulations via calls to kernel32.dll methods).

Ok, so what happened before is that the item you added was destroyed before it could be shown

Hi @AnantAgrawal, Just just launch your app from the console. qDebug, qWarning etc. will be printed to the console too (stdout/stderr). Make sure you don't define QT_NO_DEBUG_OUTPUT -- see http://doc.qt.io/qt-5/debug.html for more info.

@mcosta Hi, I'll certainly take a look at it. So I guess it's not only changing the font xD Thank you.

Thanks Sam for Chris for great ideas. I had put together made an test implementation. I wrote a Makefile as release: main.cpp g++ main.cpp -o booh debug: main.cpp g++ main.cpp -o booh -DDEBUG_ENABLE Since release configuration at the top, that becomes default one. So, here in this case, release is by default. And, when someone wants to enable debug messages, they would call "make debug", which defines a MACRO called DEBUG_ENABLE. In the .cpp file, #ifdef DEBUG_ENABLE #define PRINTDEBUG(debugString) std::cout << (debugString) << std::endl; #else #define PRINTDEBUG(debugString) #endif So, based on configuration, Macro is either enabled or disabled. Thanks!

it doesn't seem to matter what rectangle values I pass to drawImage, or if it's based on the paper size or even if I try a dummy rect that is like (0,0,50,50) - the resulting print still occupies the entire 8.5x11 sheet of paper and is cutoff on the right..