Print QWebView Error

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The first page of the print out of a QWebView with small fonts and images.

Note: The error occurs in "windows 7" (not tested on other platforms)
Note: Qt5.0.2, Windows 7 64bit

The other pages are normal view a ScreenShot error:
TXCp8.jpg

Source:

QPrinter p;
    p.setPaperSize(QPrinter::A4);
    p.setFullPage(true);
    p.setResolution(300);
    p.setOrientation(QPrinter::Portrait);
 
    QPrintPreviewDialog preview(&p);
    preview.setWindowTitle(ui->myWebView->page()->mainFrame()->title());
    connect(&preview, SIGNAL(paintRequested(QPrinter*)), this, SLOT(printPreview(QPrinter*)));
    preview.exec();
 
    ...
 
    void printPreview(QPrinter *printer) {
        ui->myWebView->print(printer);
    }

QPrinter p;
    p.setPaperSize(QPrinter::A4);
    p.setFullPage(true);
    p.setResolution(300);
    p.setOrientation(QPrinter::Portrait);

    QPrintPreviewDialog preview(&p);
    preview.setWindowTitle(ui->myWebView->page()->mainFrame()->title());
    connect(&preview, SIGNAL(paintRequested(QPrinter*)), this, SLOT(printPreview(QPrinter*)));
    preview.exec();
    
    ...
    
    void printPreview(QPrinter *printer) {
        ui->myWebView->print(printer);
    }

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I used QPageSetupDialog and corrected in QPrintPreviewDialog but when printing on paper the error happens again.

I also tried using this:

QPrinter p;
    p.setPaperSize(QPrinter::A4);
    p.setFullPage(true);
    p.setResolution(300);
    p.setOrientation(QPrinter::Portrait);
 
    QPrintPreviewDialog preview(&p);
    preview.setWindowTitle(ui->myWebView->page()->mainFrame()->title());
    connect(&preview, SIGNAL(paintRequested(QPrinter*)), ui->myWebView, SLOT(print(QPrinter*)));
    preview.exec();

QPrinter p;
    p.setPaperSize(QPrinter::A4);
    p.setFullPage(true);
    p.setResolution(300);
    p.setOrientation(QPrinter::Portrait);

    QPrintPreviewDialog preview(&p);
    preview.setWindowTitle(ui->myWebView->page()->mainFrame()->title());
    connect(&preview, SIGNAL(paintRequested(QPrinter*)), ui->myWebView, SLOT(print(QPrinter*)));
    preview.exec();

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But the error persists.

How to solve? Thanks.

[ObiWanKenobe]

I have the same problem.
It's a known issue: QTBUG-30621
It's commented, that it's done, but it isn't.
I'm using Qt 5.1 (win7 x32, x64) and the contents of <TABLE> tags are displaced in the print preview.
Can anybody tell, whether it's solved on Qt 5.1.1?

Thanks

[ObiWanKenobe]

Qt 5.2 alpha has the solution:
just change the method bool QPreviewPaintEngine::begin(QPaintDevice *) in /qtbase/src/printsupport/kernel/qpaintengine_preview.cpp like this:

bool QPreviewPaintEngine::begin(QPaintDevice *)
{
    Q_D(QPreviewPaintEngine);
 
    qDeleteAll(d->pages);
    d->pages.clear();
 
    QPicture *page = new QPicture;
    page->d_func()->in_memory_only = true;
    d->painter = new QPainter(page);
    d->engine = d->painter->paintEngine();
    *d->painter->d_func()->state = *painter()->d_func()->state; // this line makes the difference
    d->pages.append(page);
    d->state = QPrinter::Active;
    return true;
}

bool QPreviewPaintEngine::begin(QPaintDevice *)
{
    Q_D(QPreviewPaintEngine);

    qDeleteAll(d->pages);
    d->pages.clear();

    QPicture *page = new QPicture;
    page->d_func()->in_memory_only = true;
    d->painter = new QPainter(page);
    d->engine = d->painter->paintEngine();
    *d->painter->d_func()->state = *painter()->d_func()->state; // this line makes the difference
    d->pages.append(page);
    d->state = QPrinter::Active;
    return true;
}

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compile printsupport.pro...
voilà ...
it works.

[advseo32]

Qt 5.2 alpha has the solution:
just change the method bool QPreviewPaintEngine::begin(QPaintDevice *) in /qtbase/src/printsupport/kernel/qpaintengine_preview.cpp like this:

bool QPreviewPaintEngine::begin(QPaintDevice *)
{
    Q_D(QPreviewPaintEngine);
 
    qDeleteAll(d->pages);
    d->pages.clear();
 
    QPicture *page = new QPicture;
    page->d_func()->in_memory_only = true;
    d->painter = new QPainter(page);
    d->engine = d->painter->paintEngine();
    *d->painter->d_func()->state = *painter()->d_func()->state; // this line makes the difference
    d->pages.append(page);
    d->state = QPrinter::Active;
    return true;
}

bool QPreviewPaintEngine::begin(QPaintDevice *)
{
    Q_D(QPreviewPaintEngine);

    qDeleteAll(d->pages);
    d->pages.clear();

    QPicture *page = new QPicture;
    page->d_func()->in_memory_only = true;
    d->painter = new QPainter(page);
    d->engine = d->painter->paintEngine();
    *d->painter->d_func()->state = *painter()->d_func()->state; // this line makes the difference
    d->pages.append(page);
    d->state = QPrinter::Active;
    return true;
}

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compile printsupport.pro...
voilà ...
it works.

i have modified the file and open the printsupport.pro in qtcreator , after that i have compile it

but he generate no thing , what should he generate ? a .dll file ?

[ObiWanKenobe]

As I compiled the printsupport.pro, the output files were created in c:\lib.
Copy the dll into qtdir/bin and lib file into qtdir/lib.

The patch fixes the print preview, but the print out on the paper is still wrong.

[advseo32]

As I compiled the printsupport.pro, the output files were created in c:\lib.
Copy the dll into qtdir/bin and lib file into qtdir/lib.

The patch fixes the print preview, but the print out on the paper is still wrong.

and what should i do ? to print it correctly in the paper ??

---

Added after 1 1:

is there any other solution to print report, because my project stopped now

---

Added after 22 minutes:

after printing i get an error

this the how looks like the image

c53w.png

when i run in preview there is no problem

previewPrint.png

how i can solve this problem ?

[ObiWanKenobe]

As I said, I have the same problem.
Either you wait until 5.2 is out, or you port your program to 4.8.5 as I did.
With a few

#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
...
#else
...
#endif

#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
...
#else
...
#endif

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it's a relative simple task.

[advseo32]

As I said, I have the same problem.
Either you wait until 5.2 is out, or you port your program to 4.8.5 as I did.
With a few

#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
...
#else
...
#endif

#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
...
#else
...
#endif

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it's a relative simple task.

where i can do this in .pro file ??

[ObiWanKenobe]

It has nothing to do with the pro file.
Install Qt 4.8.5 and compile your program against it.
Use the "#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)" in your sources.
It is neccessary, because the module structure has changed in Qt5.
For example:

#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
#include <QtGui>
#else
#include <QtWidgets>
#endif

#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
#include <QtGui>
#else
#include <QtWidgets>
#endif

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Error still exists in 5.2.1, see:
https://bugreports.qt-project.org/browse/QTBUG-37240

Vote please! Thanks!