Print Preview features fails on Windows 10

[NIXIN]

@mrjj
Hi,
I have developed a sample application which gives the same problem

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <Qpainter>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
Q_OBJECT

public:
explicit Widget(QWidget *parent = 0);
~Widget();

private slots:
void on_pushButton_clicked();

private:
Ui::Widget *ui;
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include "testdialog.h"

Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
}

Widget::~Widget()
{
delete ui;
}

void Widget::on_pushButton_clicked()
{
TestDialog dlg;
dlg.printPreview();
dlg.exec();
}

testdialog.h

#ifndef TESTDIALOG_H
#define TESTDIALOG_H

#include <QDialog>
#include <QPainter>
#include <QPrintPreviewWidget>
#include <QPrinter>
#include <QDebug>

namespace Ui {
class TestDialog;
}

class TestDialog : public QDialog
{
Q_OBJECT

public:
explicit TestDialog(QWidget *parent = 0);
~TestDialog();

void printPreview();

public slots:
void slot_print(QPrinter *printer);

private:
Ui::TestDialog ui;
QPrintPreviewWidget printPreviewWidget;
QPrinter printer;
};

#endif // TESTDIALOG_H

testdialog.cpp

#include "testdialog.h"
#include "ui_testdialog.h"

TestDialog::TestDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::TestDialog)
{
ui->setupUi(this);

setWindowFlags(Qt::Window);
//printPreviewWidget = NULL;

}

TestDialog::~TestDialog()
{
delete ui;
}

void TestDialog::printPreview()
{
printPreviewWidget = new QPrintPreviewWidget(&printer, this);

connect(printPreviewWidget, SIGNAL(paintRequested(QPrinter*)), this, SLOT(slot_print(QPrinter*)));

ui->gridLayout->addWidget(printPreviewWidget);

}

void TestDialog::slot_print(QPrinter *printer)
{
QPainter painterForPrint(printer);

int viewPortWidth = painterForPrint.viewport().width();
int viewPortHeight = painterForPrint.viewport().height();

qDebug() << "View Port Width: " << viewPortWidth;
qDebug() << "View Port Height: " << viewPortHeight;
}

main.cpp

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();

return a.exec();

}

I got the following error on windows 10:

QWin32PrintEngine::initialize: CreteDC failed (The specified procedure could not be found.)

I am getting viewport dimensions as zero.

Whereas on Windows 7, I don't get any such error and also, I got a valid view port dimensions.

[kenchan]

@NIXIN
OK, I built your sample and got it working without any errors.
You have a couple of issues with that code but I guess they are just typos.

Ui::TestDialog ui; needs to be a pointer -> Ui::TestDialog *ui;
QPrintPreviewWidget printPreviewWidget; needs to be a pointer -> QPrintPreviewWidget *printPreviewWidget;

[NIXIN]

@kenchan

Hi,
Thanks for reverting back, but the errors which you pointed are pointers. I checked in my code, those are pointers.

Actually I have directly copied and pasted the code to this editor, may be due to that some modifications had taken place.

However, What values of 'View Port Width' and 'View Port Height' you got??

[kenchan]

@NIXIN
View Port Width: 1101
View Port Height: 771

[NIXIN]

@kenchan
Did you tried on Windows 10??

[kenchan]

@NIXIN
yes, Windows 10 64bit Qt 5.6.0

[NIXIN]

@kenchan

But for me its not working....

[mrjj]

@NIXIN
are you sure you have a default printer?

[kenchan]

@NIXIN
there must be something wrong with your QT installation, project settings or your runtime env??

Are you using the Microsoft compiler or something else?

[NIXIN]

I have cute PDF writer....

[NIXIN]

@kenchan
I am using mingw32bit...

[kenchan]

@NIXIN
I have never used it so I can't offer you any advice on that.

[NIXIN]

@kenchan
Are you using qt-opensource-windows-x86-msvc2015_64-5.6.0.exe installation ?

[kenchan]

@NIXIN
I am currently using qt-opensource-windows-x86-msvc2013_64-5.6.0