Loading my first newly built plugin while debugging

SGaist

Hi,

You should set the QT_DEBUG_PLUGINS environnement variable to 1 and re-run your application. You’ll get more information about what is happening.

mgreenish

@SGaist said in Loading my first newly built plugin while debugging:

QT_DEBUG_PLUGINS

Great! Now I get a message in the Application Output:

QMachOParser: '/Users/greanie/Work/HapticX/Engineering/Software/plugins/libreactionsserverplugin_debug.dylib' is not a Qt plugin

So somehow my plugin is not properly set up.

Below is my .pro file:

TEMPLATE        = lib                                       # making a library, not an executible
CONFIG         += plugin                                    #
QT             += widgets network gui
INCLUDEPATH    += ../vibecreator/vibecreator/               # include path to plugin interface
TARGET          = $$qtLibraryTarget(reactionsserverplugin)  # name of the library file in which the plugin will be stored, should be same as name of the plugin
DESTDIR         = ../plugins

# install
target.path = ../plugins
INSTALLS += target

CONFIG += install_ok  # Do not cargo-cult this!

SOURCES += reactionsserverplugin.cpp

HEADERS  += reactionsserverplugin.h

FORMS += \
    reactionfileform.ui

DISTFILES += \
    reactionsserver.plugin.json

Below is my plugin header:

#include <QObject>
#include <QWidget>
#include <QtPlugin>
#include <QDialog>

//#include "../vibecreator/vibecreator/reactionsserverinterface.h"
#include "reactionsserverinterface.h"
#include "creatorwindow.h"

namespace Ui {
    class ReactionServerFileForm;
}

class ReactionsServerPlugin : public QWidget, ReactionsServerInterface
{
    Q_OBJECT
    Q_PLUGIN_METADATA( IID "org.qt-project.Qt.AddHaptics.ReactionsServerInterface" FILE "reactionsserver.plugin.json" )
    Q_INTERFACES(ReactionsServerInterface)

public:
    ReactionsServerPlugin( CreatorWindow* parent ) { setParent( parent ); } // makes this qwidget a child window

    void createForm();  // override;
    void showForm();    // override
    void hideForm();

private:
    Ui::ReactionServerFileForm* ui;

};

#endif // REACTIONSSERVER_GLOBAL_H

Below is my source:

#include <QtWidgets>

#include "reactionsserverplugin.h"
#include "ui_reactionfileform.h"

void ReactionsServerPlugin::createForm()
{
    ui = new Ui::ReactionServerFileForm;
    ui->setupUi(this);
}

void ReactionsServerPlugin::showForm() {
    this->setVisible(true);
}

void ReactionsServerPlugin::hideForm() {
    this->setVisible(false);
}

It all compiles, as per the dylib file. Any ideas on what I might be doing wrong?

mrjj

Hi
For the ReactionsServerInterface
Do you have something like
Q_DECLARE_INTERFACE(ReactionsServerInterface, "in.forwardbias.tool/1.0")
under the class definition ?

mgreenish

@mrjj I didn't put my interface class in my past post because I figured my problem was a set up one with the plugin. But, here it is

#ifndef REACTIONSSERVER_INTERFACE_H
#define REACTIONSSERVER_INTERFACE_H

class ReactionsServerInterface
{

public:
    virtual ~ReactionsServerInterface(){}
    virtual void createForm() = 0;
    virtual void showForm() = 0;
    virtual void hideForm() = 0;
};

#define ReactinonsSeverInterface_iid "org.qt-project.Qt.AddHaptics.ReactionsServerInterface"

Q_DECLARE_INTERFACE(ReactionsServerInterface, ReactinonsSeverInterface_iid)

#endif // REACTIONSSERVER_H

I do have the Q_DECLARE_INTERFACE .

The only thing I can find that is wrong in my plugin is that I get a warning that reactionsserver.plugin.json doesn't hold a valid json object. But I don't know how that would influence whether or not my plugin is a valid plugin.

mrjj

@mgreenish
I also got that message as far as i can recall but it still loaded.

SGaist

Can you show the json ?

mgreenish

I read in a post that it could be left blank, so that gave me an error that cased the compiler to error out. So I found this online and now I only get a warning:

@{ "Keys": [ "reactionserveristhisplugin" ] }@

Granted, I haven't figured out what is wrong with this structure as I didn't think this would be source of my error.

The warning is:

../reactionsserverplugin.h:20: Warning: Plugin Metadata file "reactionsserver.plugin.json" does not contain a valid JSON object. Declaration will be ignored

SGaist

Might be silly but I wonder if it's because you have two dots in your file name.

mgreenish

That doesn't seem to be it:

../reactionsserverplugin.h:20: Warning: Plugin Metadata file "reactionsserverplugin.json" does not contain a valid JSON object. Declaration will be ignored

SGaist

Again might be silly but did you try to lint your json file ? Might have a stray char somewhere that's messing things up.

{
    "Keys": ["reactionserveristhisplugin"]
}

Should be good.

mgreenish

@SGaist So it turns out that this file is optional. I removed it from the Q_PLUGIN_METADATA declaration and that seemed to resolve the warning. Now everything compiles and the dylib loads.