Greeting
I created plugin with Qt (5.6.2) and trying to load it but it returns null all the time. I checked several question and also tried the solutions but it didn't work for me.
Can you take a look of the following code and see whats wrong?
DeviceManager.hpp
#ifndef DEVICE_MANAGER_HPP
#define DEVICE_MANAGER_HPP
#include <QtCore>
#include <string>
using namespace std;
class DeviceManager
{
public:
virtual ~DeviceManager() {}
virtual bool initialize() = 0;
virtual string getBrandName() = 0;
};
QT_BEGIN_NAMESPACE
Q_DECLARE_INTERFACE(DeviceManager, "com.some.address/1.0")
QT_END_NAMESPACE
#endif //DEVICE_MANAGER_HPP
#ifndef DEVICE_MANAGER_HPP
#define DEVICE_MANAGER_HPP
#include <QtCore>
#include <string>
using namespace std;
class DeviceManager
{
public:
virtual ~DeviceManager() {}
virtual bool initialize() = 0;
virtual string getBrandName() = 0;
};
QT_BEGIN_NAMESPACE
Q_DECLARE_INTERFACE(DeviceManager, "com.some.address/1.0")
QT_END_NAMESPACE
#endif //DEVICE_MANAGER_HPP
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DeviceManagerImpl.hpp
#ifndef DEVICE_MANAGER_IMPL_HPP
#define DEVICE_MANAGER_IMPL_HPP
#include "DeviceManager.hpp"
#include <string>
using namespace std;
class DeviceManagerImpl
: public QObject,
public DeviceManager
{
Q_OBJECT
Q_PLUGIN_METADATA(IID "com.some.address/1.0")
Q_INTERFACES(DeviceManager)
public:
DeviceManagerImpl();
//Override Method
bool initialize(); //Have implementation in cpp file
string getBrandName(); //Have implementation in cpp file
private:
...
};
#endif //DEVICE_MANAGER_IMPL_HPP
#ifndef DEVICE_MANAGER_IMPL_HPP
#define DEVICE_MANAGER_IMPL_HPP
#include "DeviceManager.hpp"
#include <string>
using namespace std;
class DeviceManagerImpl : public QObject, public DeviceManager
{
Q_OBJECT
Q_PLUGIN_METADATA(IID "com.some.address/1.0")
Q_INTERFACES(DeviceManager)
public:
DeviceManagerImpl();
//Override Method
bool initialize(); //Have implementation in cpp file
string getBrandName(); //Have implementation in cpp file
private:
...
};
#endif //DEVICE_MANAGER_IMPL_HPP
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Pro File
QT += core gui sql
TARGET = Device-Manager
#TARGET = $$qtLibraryTarget(Device-Manager)
TEMPLATE = lib
CONFIG += plugin
SOURCES += \
...
HEADERS += \
...
DISTFILES += Device-Manager.json
unix {
target.path = /usr/lib
INSTALLS += target
}
QT += core gui sql
TARGET = Device-Manager
#TARGET = $$qtLibraryTarget(Device-Manager)
TEMPLATE = lib
CONFIG += plugin
SOURCES += \
...
HEADERS += \
...
DISTFILES += Device-Manager.json
unix {
target.path = /usr/lib
INSTALLS += target
}
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And this is how i try to load the plugin in my main process.
QObject * plugin
= pluginLoader
->instance
();
if (plugin)
{
deviceManager = qobject_cast<DeviceMAnager *>(plugin);
return true;
}
else
{
delete pluginLoader;
return false;
}
QPluginLoader * pluginLoader = new QPluginLoader(pluginPath.c_str());
QObject * plugin = pluginLoader->instance();
if (plugin)
{
deviceManager = qobject_cast<DeviceMAnager *>(plugin);
return true;
}
else
{
delete pluginLoader;
return false;
}
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Im using QT 5.6.2 and QT Creator and MinGW 32bit.
Thanks in advance.
QPluginLoader instance always returns null
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Originally Posted by ChrisW67
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