Question

I am using libvcard in a Qt Application. I installed the library on Ubuntu as instructed in the read me file (i.e. I ran qmake, make, sudo make install on the project file) but when I try to run this code from the website, I get a bunch of errors.

   #include <QtCore/QCoreApplication>
#include <vcard/vcard.h>
#include <QtDebug>

int main(int argc, char *argv[])
{
    // Now we can parse it...
    QList<vCard> vcards = vCard::fromFile("/home/ubuntu/Desktop/Contacts.vcf");

    // ...and then we can use it.
    if (!vcards.isEmpty())
    {
        vCard vcard = vcards.takeFirst();

        vCardProperty name_prop = vcard.property(VC_NAME);
        if (name_prop.isValid())
        {
            QStringList values = name_prop.values();

            QString firstname = values.at(vCardProperty::Firstname);
            QString lastname = values.at(vCardProperty::Lastname);

            qDebug()<<firstname<<" "<<lastname;
        }

    }

}

Errors

In function main:

/home/ubuntu/Workspace/Qt/cVCardTest-build-desktop-Desktop_Qt_4_8_1_for_GCC__Qt_SDK__Debug/../cVCardTest/main.cpp:8:

error: undefined reference to `vCard::fromFile(QString const&)
/home/ubuntu/Workspace/Qt/cVCardTest-build-desktop-Desktop_Qt_4_8_1_for_GCC__Qt_SDK__Debug/../cVCardTest/main.cpp:15:

error: undefined reference to vCard::property(QString const&, QList<vCardParam> const&, bool) const
/home/ubuntu/Workspace/Qt/cVCardTest-build-desktop-Desktop_Qt_4_8_1_for_GCC__Qt_SDK__Debug/../cVCardTest/main.cpp:15: error: undefined reference tovCard::property(QString const&, QList const&, bool) const’
‘

I’m not sure what I’ve done wrong.
Should I be adding something to the project file in order to use this library?

Answer 1

vcard is external library, so linker must know, where to look for used symbols. You need to link with vcard library. In your .pro file add

LIBS += vcard