The conflict between quazip and mupdf-qt

Alexorleon

Hi.

In my project, I use quazip to work with the archive. Now it was necessary to draw a PDF document. For this, I decided to use mupdf-qt, but if they are used simultaneously, an error occurs. I absolutely do not understand what this is connected with.
Maybe you can tell me what the problem is?

QuaZIP
https://github.com/mnafees/quazip

mupdf-qt
https://github.com/xiangxw/mupdf-qt

Ubuntu 14.04, 64bit
Qt 5.7.1

.pro

...

DEFINES += QUAZIP_STATIC

unix {
    # quazip
    QUAZIPCODEDIR = "/home/alexorleon/QtProjects/libs/quazip-0.7.2/quazip"
    ZLIBCODEDIR = "/home/alexorleon/QtProjects/libs/Libs"
    INCLUDEPATH += $${QUAZIPCODEDIR}
    LIBS += -L$${ZLIBCODEDIR} -lz

    # mupdf-qt
    INCLUDEPATH += "/home/alexorleon/Development/Projects/mupdf-qt/include"
    LIBS += -L/home/alexorleon/Development/Projects/mupdf-qt/build/lib -lmupdf-qt
    LIBS += -L/home/alexorleon/Development/Projects/mupdf-qt/mupdf/build/debug/ -lmupdf  -ljpeg -lfreetype -lz -ljbig2dec -lcrypto -ldl -lmujs -lopenjpeg
}

SOURCES += main.cpp \
    $${QUAZIPCODEDIR}/*.cpp \
    $${QUAZIPCODEDIR}/*.c

HEADERS += $${QUAZIPCODEDIR}/*.h
...

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QImage>
#include <QDebug>

#include "JlCompress.h"
#include "mupdf-qt.h"

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);


    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    JlCompress::extractDir("/home/alexorleon/Deployment/doc.zip", "/home/alexorleon/Deployment/temp");

    QString filename("/home/alexorleon/doc.pdf");
    MuPDF::Document *document = MuPDF::loadDocument(filename);
    if (document) {

        // number of pages
        qDebug() << "pages: " << document->numPages();
        // other informations
        qDebug() << "version: " << document->pdfVersion();
        qDebug() << "title: " << document->title();
        qDebug() << "author: " << document->author();
        qDebug() << "subject: " << document->subject();
        qDebug() << "keywords: " << document->keywords();
        qDebug() << "creator: " << document->creator();
        qDebug() << "producer: " << document->producer();
        //qDebug() << "creation date: " << document->creationDate();
        //qDebug() << "recently modify date: " << document->modDate();

        MuPDF::Page *page = document->page(1);
        if (page) {
            float scaleX = 1.0f;
            float scaleY = 1.0f;
            float rotation = 0.0f;
            QImage image = page->renderImage(scaleX, scaleY, rotation);
            // do something with the QImage
            image.save("/home/alexorleon/test.jpeg", "JPEG");
            // do not forget this
            delete page;
        }

        // do not forget to delete it
        delete document;
    }

    return app.exec();
}

error: quagzipfile.o: undefined character reference «gzdopen»
/lib/x86_64-linux-gnu/libz.so.1:-1: error: error adding symbols: DSO missing from command line
error: collect2: error: ld returned 1 exit status

But if I comment out one of the libraries, then everything works.
For example:

# quazip
#QUAZIPCODEDIR = "/home/alexorleon/QtProjects/libs/quazip-0.7.2/quazip"
#ZLIBCODEDIR = "/home/alexorleon/QtProjects/libs/Libs"
#INCLUDEPATH += $${QUAZIPCODEDIR}
#LIBS += -L$${ZLIBCODEDIR} -lz

//#include "JlCompress.h"

//JlCompress::extractDir("/home/alexorleon/Deployment/doc.zip", "/home/alexorleon/Deployment/temp");

SGaist

Hi,

Did you build these two libraries yourself ?
Which version of gcc are you using ?

ambershark

@Alexorleon said in The conflict between quazip and mupdf-qt:

error: quagzipfile.o: undefined character reference «gzdopen»
/lib/x86_64-linux-gnu/libz.so.1:-1: error: error adding symbols: DSO missing from command line

This error comes from linking order. You are linking your objects that use the library after the library itself. Change your link order and it should work.

Your problem should be in these lines:

    LIBS += -L/home/alexorleon/Development/Projects/mupdf-qt/build/lib -lmupdf-qt
    LIBS += -L/home/alexorleon/Development/Projects/mupdf-qt/mupdf/build/debug/ -lmupdf  -ljpeg -lfreetype -lz -ljbig2dec -lcrypto -ldl -lmujs -lopenjpeg

My guess is move that -lz further down the line... try at the end maybe.

kshegunov

SOURCES += main.cpp \
    $${QUAZIPCODEDIR}/*.cpp \
    $${QUAZIPCODEDIR}/*.c

HEADERS += $${QUAZIPCODEDIR}/*.h

??!

Why do you add the source directly in your build tree?

ambershark

@kshegunov said in The conflict between quazip and mupdf-qt:

SOURCES += main.cpp \
    $${QUAZIPCODEDIR}/*.cpp \
    $${QUAZIPCODEDIR}/*.c

HEADERS += $${QUAZIPCODEDIR}/*.h
??!

Why do you add the source directly in your build tree?

I didn't even notice that. I wasn't looking thoroughly though since I knew what was the likely culprit based on the error. That is definitely a contributing factor to the error though.

He definitely needs to remove that from his qmake. Good catch!

Alexorleon

@SGaist Yes, both libraries I compiled by myself. gcc version 4.8.4

Alexorleon

@ambershark Yes, I tried to do so. It did not help.

@kshegunov This is necessary to use .c files. Maybe, I do not remember ;) Maybe I should try to add only specific files.

Alexorleon

From time to time I try different solutions, but for now I decided to use poppler. Everything is working.

Alexorleon

If I comment the lines

SOURCES += main.cpp# \
    #$${QUAZIPCODEDIR}/*.cpp \
    #$${QUAZIPCODEDIR}/*.c

#HEADERS += $${QUAZIPCODEDIR}/*.h

error: undefined reference to `JlCompress::extractDir(QString, QString)'