Combine Multiple Images Into a Single PDF

geor

I have a multiple widgets each covering one page of an application I convert each widget to an image with

ui->myWidget->grab().save("image.png");

I would like to save them into a pdf later if the users decides too it is possible to convert on image into a pdf and save it with qt but how do I make all 5 images I have into one pdf with page numbers (if possible)

thank you

koronabora

Use one of them:

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Hi! No need for external libraries. QPdfWriter can create documents with multiple pages.

koronabora

I thought that if somebody asks this question, the answer from the documentation it is not suitable for him. I made a mistake.

geor

@Wieland I took a look at the functions for that class and all I see is way to edit the pages but how do you add the images?

thank you

geor

@koronabora thank you but I prefer not to use 3rd party lib

mrjj

@geor
Hi
You draw the images to it.
http://www.codeprogress.com/cpp/libraries/qt/showQtExample.php?index=570&key=QPdfWriterWriteImage

Keep in mind about DPI.

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@geor Like this:

void writePdf()
{
    const QString fileName("/home/patrick/mydoc.pdf");
    const QImage image("/home/patrick/truck.jpg");
    const QPoint imageCoordinates(0,0);

    QPdfWriter pdfWriter(fileName);
    pdfWriter.setPageSize(QPageSize(QPageSize::A4));
    QPainter painter(&pdfWriter);

    for (int i=0; i<3; ++i) {
        painter.drawImage(imageCoordinates, image);
        pdfWriter.newPage();
    }
}

geor

@mrjj thank you

geor

@Wieland thank you

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@geor :-)

geor

@Wieland I keep getting qpainter::begin() reutnr false

I am even using your exact code

        const QString fileName("C:/Qt");
const QImage image("C:/Users/georg/Desktop/testPdf/Untitled.jpg");
const QPoint imageCoordinates(0,0);

QPdfWriter pdfWriter(fileName);
pdfWriter.setPageSize(QPagedPaintDevice::A1);
QPainter painter(&pdfWriter);

for (int i=0; i<3; ++i)
{
    painter.drawImage(imageCoordinates, image);
    pdfWriter.newPage();
    qDebug()<<2;
}

except for the page size becuase I am using qt 5.2.1

do you have any idea why ebcuase I cannot figure it out the debug still runs i just get the eror and it does not save

mrjj

@geor said:

const QString fileName("C:/Qt");

that is the actual filename ?

I would expect something like
const QString fileName("c:/mydoc.pdf");

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To add to what @mrjj said, do you have write access to C:/?

geor

@mrjj said:

@
I still get the same error

geor

This post is deleted!

geor

@Wieland

once again thank you for your help it worked when I switch to the drive where the build is saved .However for some reason it is 4 empty pages maybe it's becuase of the size or something I'll try another image and see but again thank you

mrjj

@geor
I think its just a path thing

void writePdf()
{
    const QString fileName("e:/mydoc.pdf");
       QPdfWriter pdfWriter(fileName);
    pdfWriter.setPageSize(QPageSize(QPageSize::A4));
    QPainter painter(&pdfWriter);

    for (int i=0; i<3; ++i) {
        painter.drawPixmap(QRect(0,0,pdfWriter.logicalDpiX()*8.3,pdfWriter.logicalDpiY()*11.7), QPixmap("e:/truck.png"));
        pdfWriter.newPage();
    }
}

works here. makes PDF on e:

mrjj

@geor
hi
You will / might need to scale the picture or its really small.

geor

@mrjj

yeh it worked after scaling thank you.