QPrintPreviewDialog shows only blank grey area

[regular]

No, it didn't have one set as default. I just set the XPS document printer as default and that fixed the problem. Thanks a lot!

But is that normal behavior? If a client machine doesn't have a default printer set as mine didn't, that wouldn't be desired behavior I think? Is there a way to get around it in the code or is that what it should do?

Thanks again!

[ChrisW67]

The problem is that the page size of a non-existent printer is zero, resulting in no visible output. If you had a printer, any printer, then the preview will always show a blank first page even if nothing is painted.

QPrinterInfo::defaultPrinter() returns a QPrinterInfo object where QPrinterInfo::isNull() is true if there is no default printer. In that case you could use QPrintDialog or otherwise select a printer to use and then create your QPrinter object.

[regular]

Sounds good, thanks again!

EDIT: A quick note for anyone else having the problem, ussing just QPrinterInfo::isNull() didn't help because that only seems to return true if there are no printers at all on the system (and still returns false if there is no default printer set) so I had to check the printer's name too:

QPrinterInfo def = QPrinterInfo::defaultPrinter();
 
	//if there is no default printer set the print preview won't show
	if(def.isNull() || def.printerName().isEmpty())
	{
		if(QPrinterInfo::availablePrinters().isEmpty())
		{
			QMessageBox::critical(this, tr("Print error"), tr("Cannot proceed because there are no available printers in your system."), QMessageBox::Ok);
		}
		else
		{
			def = QPrinterInfo::availablePrinters().first();
		}
	}
 
	QPrinter printer(def, QPrinter::ScreenResolution);
        .....

QPrinterInfo def = QPrinterInfo::defaultPrinter();

	//if there is no default printer set the print preview won't show
	if(def.isNull() || def.printerName().isEmpty())
	{
		if(QPrinterInfo::availablePrinters().isEmpty())
		{
			QMessageBox::critical(this, tr("Print error"), tr("Cannot proceed because there are no available printers in your system."), QMessageBox::Ok);
		}
		else
		{
			def = QPrinterInfo::availablePrinters().first();
		}
	}

	QPrinter printer(def, QPrinter::ScreenResolution);
        .....

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