Qprinter inside a thread does not create a file in mac

zandarina

Hello, I have a doubt. In windows, it works well, But in mac, It doesn´t. What I want to do is to create a pdf report and first I run it in the main thread. Then I wanted to add a loader so I run it in another thread. And then the problem started in mac. And it does not generate any output in the qprinter. If I remove the loader it works again. The problem is the thread (QConcurrent::run) but I do not understand why. And why only in mac. Thank you

static QFutureWatcher<void> watcher;
QObject::connect(&watcher, &QFutureWatcherBase::finished, [=]() {
	//watcher.waitForFinished();
	finished();
});


watcher.setFuture(
	QtConcurrent::run([=]() { 
QPrinter pdfWriter;
pdfWriter.setPageSize(QPagedPaintDevice::A4);
//It does not work. Trick, I will use the painter
pdfWriter.setPageMargins(10, 10, 10, 10, QPrinter::Millimeter);
double margin_ForPainter = 20;
pdfWriter.setOrientation(QPrinter::Portrait);
pdfWriter.setFullPage(true);
pdfWriter.setOutputFileName("pdf_generated.pdf");
QTextDocument document;
QString html =
    		"<head>"
               "< / head>";
pdfWriter.setOutputFormat(QPrinter::PdfFormat);
   document.setHtml(html);
//Open the file generated
QDesktopServices::openUrl(QUrl::fromLocalFile("pdf_generated.pdf"));
}));

J.Hilk

@zandarina hi, define a proper path, on MacOS you don't have write permission where pdfWriter.setOutputFileName("pdf_generated.pdf"); is trying to create the file

zandarina

Hi the resource dir or bundle is created. at the beginning in mac. This setouputFileName if I do not launch any thread it creates the file in the correct place. I do not understand why I do not have persimission if a thread is created with the watcher. The bundle is lost?

J.Hilk

@zandarina ok, I miss read than, I thought it wouldn't work at all, usually one isn't allowed to create files inside the package contents folder

SGaist

Hi,

Can you provide a complete minimal example that shows that behaviour ?