PDF to Image Converter

[RajabNatshah]

Hi

I'm working on PDF to Image Converter

I made tool which to select Folder or Directory then It will convert each PDF file to an image..
But I still have some problems.

QString fileName = fileInfo.fileName();
 
                                     QPixmap pdfFile;
                                     QPixmap scaledsimage;
                                        int page = 1;
                                        int large = 1000;
 
                                        QFileInfo fixurl(lineEditSorceFolder->text()+"/"+fileName);
 
 
 
                                         pdfFile   = LoadPDF( fixurl.absoluteFilePath() ,page,large);
 
 
 
                                     QByteArray bytes;
                                     QBuffer buffer(&bytes);
                                     buffer.open(QIODevice::ReadWrite);
                                     scaledsimage.save(&buffer,"PNG",100);

QString fileName = fileInfo.fileName();

                                     QPixmap pdfFile;
                                     QPixmap scaledsimage;
                                        int page = 1;
                                        int large = 1000;

                                        QFileInfo fixurl(lineEditSorceFolder->text()+"/"+fileName);



                                         pdfFile   = LoadPDF( fixurl.absoluteFilePath() ,page,large);
                                     


                                     QByteArray bytes;
                                     QBuffer buffer(&bytes);
                                     buffer.open(QIODevice::ReadWrite);
                                     scaledsimage.save(&buffer,"PNG",100);

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It's seem It dose the PDF.. but
the image dose not come out at all..

I have tested to draw something on the image and it dose work.

Please, I need help.. I do not know if there is any easier way to Process that..

Best Regards

[vishwajeet.dusane]

HI

http://www.foolabs.com/xpdf/ try this, u just have to port that in ur application. it will give u image also

[ChrisW67]

I might be missing the obvious, but nothing in your code seems to set "scaledsimage", which will remain a null pixmap and produce nothing out at line 19.

[RajabNatshah]

Thank you ChrisW67 and vishwajeet.dusane

I have been using ..GraphicsViewEdit example to get the PDF Opject Loaded then Save any page I want to a PNG file.
http://www.qt-apps.org/content/show....?content=80234
I have been using some code and Classes to my project.

I have been messing with code.. this why it was not in my last code

pdfFile   = LoadPDF( fixurl.absoluteFilePath() ,page,large);
                                    QImage tImage =  pdfFile.toImage();
                                    tImage.save("tfile.png","PNG",100);

pdfFile   = LoadPDF( fixurl.absoluteFilePath() ,page,large);
                                    QImage tImage =  pdfFile.toImage();
                                    tImage.save("tfile.png","PNG",100);

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The tool I'm working on is some sort of mass PDF Converter to Images.

NatshahPDFtoImage.jpg

I have been trying to make it some sample .. to convert the loaded PDF file into the

the Function LoadPDF Returns QPixmap for the selected Page .. but it has no setScaledSize .. and when you save. no file at all shows up.

Best Regards

[ChrisW67]

LoadPDF() is possibly not returning what you think. Have you tried looking at pdfFile.isNull() and/or pdfFile.size() to see if a meaningful pixmap is actually being returned?

Alternatively, conversion to QImage is failing: use QImage::isNull() to check.

Or, the save is failing but you are ignoring the return code.

[RajabNatshah]

Hi ChrisW67

Thanks for your help..

the implementation Code for the Function LoadPDF

extern inline QPixmap LoadPDF(QString fn, int Page, int w )
{
        QString tmp, cmd1, cmd2;
        const QString pdfFile = PathConvert(fn);
        const QString tmpFile = PathConvert(QDir::homePath()+"/sctodaytmps.png");
    const QString qttmpFile = QDir::homePath()+"/sctodaytmps.png";
        QPixmap pm;
    tmp.setNum(Page);
        int ret = -1;
        tmp.setNum(Page);
        QStringList args;
    args.append("-sDEVICE=png16m");
    args.append("-r72");
    args.append("-dGraphicsAlphaBits=4");
    args.append("-o");
        args.append(tmpFile);
    args.append("-dFirstPage="+tmp);
        args.append("-dLastPage="+tmp);
        args.append(pdfFile);
        ret = callGS(args);
    ////////qDebug() << "### ret " << ret;
        if (ret == 0)
        {
        QPixmap tmpimage(qttmpFile);
        QPixmap penna = tmpimage.scaledToWidth(w);
        tmpimage.detach();
        QFile lastaction(qttmpFile);
        lastaction.remove();
        QPainter p;
                p.begin(&penna);
                p.setBrush(Qt::NoBrush);
                p.setPen(QPen(QBrush(Qt::black),2,Qt::SolidLine));
                p.drawRect(0, 0, penna.width(), penna.height());
                p.end();
        return penna;
        }
        return pm;
}

extern inline QPixmap LoadPDF(QString fn, int Page, int w )
{
        QString tmp, cmd1, cmd2;
        const QString pdfFile = PathConvert(fn);
        const QString tmpFile = PathConvert(QDir::homePath()+"/sctodaytmps.png");
    const QString qttmpFile = QDir::homePath()+"/sctodaytmps.png";
        QPixmap pm;
    tmp.setNum(Page);
        int ret = -1;
        tmp.setNum(Page);
        QStringList args;
    args.append("-sDEVICE=png16m");
    args.append("-r72");
    args.append("-dGraphicsAlphaBits=4");
    args.append("-o");
        args.append(tmpFile);
    args.append("-dFirstPage="+tmp);
        args.append("-dLastPage="+tmp);
        args.append(pdfFile);
        ret = callGS(args);
    ////////qDebug() << "### ret " << ret;
        if (ret == 0)
        {
        QPixmap tmpimage(qttmpFile);
        QPixmap penna = tmpimage.scaledToWidth(w);
        tmpimage.detach();
        QFile lastaction(qttmpFile);
        lastaction.remove();
        QPainter p;
                p.begin(&penna);
                p.setBrush(Qt::NoBrush);
                p.setPen(QPen(QBrush(Qt::black),2,Qt::SolidLine));
                p.drawRect(0, 0, penna.width(), penna.height());
                p.end();
        return penna;
        }
        return pm;
}

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I have tested the way you suggested with this code

pdfFile   = LoadPDF( fixurl.absoluteFilePath() ,page,large);
 
                                    if (pdfFile.isNull())
                                        QMessageBox::warning(0,"pdfFile.isNull() = True ","pdfFile.isNull() = True");
 
                                    QImage tImage =  pdfFile.toImage();
                                    if (tImage.isNull())
                                        QMessageBox::warning(0,"tImage.isNull() = True ","tImage.isNull() = True");

pdfFile   = LoadPDF( fixurl.absoluteFilePath() ,page,large);
                                    
                                    if (pdfFile.isNull())
                                        QMessageBox::warning(0,"pdfFile.isNull() = True ","pdfFile.isNull() = True");
                                        
                                    QImage tImage =  pdfFile.toImage();
                                    if (tImage.isNull())
                                        QMessageBox::warning(0,"tImage.isNull() = True ","tImage.isNull() = True");

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I'm getting both of the messages .. that mean it's not loading and converting to QPixmap

I think I will miss with the function more tomorrow..

Best Regards

[marsiliano]

Hi Rajab,
i'm interested in a function that converts PDF in a QImage, how can i implement it? is ur code available on sourceforge or somewhere?? tnx for ur help

[ChrisW67]

The approach above uses Ghostscript to convert the PDF to PNG. It simply builds a command line and runs gs (using QProcess I assume) to do the conversion. The resulting PNG file is then loaded into a QPixmap/QImage.

[mindylynn0]

Hi, thanks for sharing converting PDF to PNG. I just wonder whether it works for other raster images, especially for PDF to TIFF conversion, single-page or multi-page. Is that OK?

[peterlee]

Hi, thanks for sharing converting PDF to PNG. I just wonder whether it works for other raster images, especially for PDF to TIFF conversion, single-page or multi-page. Is that OK?

Hi, mindylynn0.
Have you ever found your way out?

[d_stranz]

Considering she made only one post to this forum, and that one nearly two years ago, it is very unlikely you will get an answer to your question from her. Why bring back a dead thread? Check the date of the last post before you respond to something.

[BonziRafer]

To save PDF to images for easily sharing, viewing and others, PDFelement is what you need. It converts PDF pages into images like JPG, JPEG, PNG, BMP, TIFF, etc. What's more, the images in PDF file can be exported to your computer.

youtube.com/watch?v=F67uHRaNvJc

[d_stranz]

Maybe you can explain why you think posting a link to a video about a commercial product is relevant in a forum dedicated to writing software using Qt? And why we shouldn't just consider your post to be spam?

[Kaizien48]

Hi Rajab,
i'm interested in a function that converts PDF in a QImage, how can i implement it? is ur code available on sourceforge or somewhere?? tnx for ur helpstory saver instagram

Hello! Unfortunately, my code isn't on SourceForge. However, I can guide you in implementing a function to convert PDF to QImage. Feel free to share more details about your project!

[d_stranz]

Feel free to share more details about your project!

Do you realize you are replying to a 14 year old post?

In case anyone wanders into this post, the QPdf module contains the functionality needed to open a PDF document, navigate through it page by page, and render individual pages to a QImage using QPdfDocument. If you want to save the image to a file, QImage::save() will do that. If you want to display the page image on-screen, then QPainter::drawImage() will do that for you.

There is no need for any external (non-Qt) code to accomplish this.

[nehakakar]

Hey hi, you should check the code because scaledsimage isn't being set correctly.

pdfFile = LoadPDF(fixurl.absoluteFilePath(), page, large);
if (pdfFile.isNull()) {
    QMessageBox::warning(0, "Error", "Failed to load PDF.");
} else {
    QImage tImage = pdfFile.toImage();
    if (!tImage.isNull()) {
        tImage.save("output.png", "PNG", 100);
    } else {
        QMessageBox::warning(0, "Error", "Failed to convert QPixmap to QImage.");
    }
}

pdfFile = LoadPDF(fixurl.absoluteFilePath(), page, large);
if (pdfFile.isNull()) {
    QMessageBox::warning(0, "Error", "Failed to load PDF.");
} else {
    QImage tImage = pdfFile.toImage();
    if (!tImage.isNull()) {
        tImage.save("output.png", "PNG", 100);
    } else {
        QMessageBox::warning(0, "Error", "Failed to convert QPixmap to QImage.");
    }
}

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[nehakakar]

Hey hi, you should check the code because scaledsimage isn't being set correctly.

pdfFile = LoadPDF(fixurl.absoluteFilePath(), page, large);
if (pdfFile.isNull()) {
    QMessageBox::warning(0, "Error", "Failed to load PDF.");
} else {
    QImage tImage = pdfFile.toImage();
    if (!tImage.isNull()) {
        tImage.save("output.png", "PNG", 100);
    } else {
        QMessageBox::warning(0, "Error", "Failed to convert QPixmap to QImage.");
    }
}

pdfFile = LoadPDF(fixurl.absoluteFilePath(), page, large);
if (pdfFile.isNull()) {
    QMessageBox::warning(0, "Error", "Failed to load PDF.");
} else {
    QImage tImage = pdfFile.toImage();
    if (!tImage.isNull()) {
        tImage.save("output.png", "PNG", 100);
    } else {
        QMessageBox::warning(0, "Error", "Failed to convert QPixmap to QImage.");
    }
}

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On the other hand you can also use any online image converter such as Image Converter and for compressor Jpeg Compressor, these are really good tool.