Program throws issue "Failed to extract plugin meta data from .dll"

[patricxian]

hi, when I use visual studio to remote debug on windows 10, the program throws the issue "Failed to extract plugin meta data from .dll". These dll are created based on the application. The Qt version is 5.12.11.
The head file of plugin is below:

class pGen12Control : public InterfaceControl
{
    Q_OBJECT
#if QT_VERSION >= 0x050000
    Q_PLUGIN_METADATA(IID InterfaceControl_iid FILE "pGen12Control.json")
#endif // QT_VERSION >= 0x050000
    Q_INTERFACES(InterfaceControl)
    FORCE_NOT_ABSTRACT(pGen12Control)

And the head file of "InterfaceControl" is below:

class InterfaceControl : public QObject, public InterfaceGlobal
{
public:
    InterfaceControl() : InterfaceGlobal(LIB_ID_CONTROL_UNKNOWN)
    {
    }
    InterfaceControl(quint16 plugID) : InterfaceGlobal(plugID)
    {
    }
    virtual ~InterfaceControl() {}
    virtual InterfaceControl * newUniqueInstance() const = 0;

    //virtual QString echo(const QString &message) = 0; // Example Function
signals:
    virtual void sendBusMessage(const so_Message & payload) = 0;

    private slots:
    virtual void recvBusMessage(const so_Message & payload) = 0;
};

#define InterfaceControl_iid "hil.tooling.control"

Q_DECLARE_INTERFACE(InterfaceControl, InterfaceControl_iid)

The call code to pluginloader function is below:

QString filepath = pluginsDir.absoluteFilePath(fileName);
QPluginLoader *pluginLoader = new QPluginLoader(filepath);
logging::log(logging::log_level::INFO, pluginLoader->errorString());

The value of "fileName" and "filepath" are right.

Appreciate your advice.

[SGaist]

Hi and welcome to devnet,

@patricxian said in Program throws issue "Failed to extract plugin meta data from .dll":

These dll are created based on the application.

What do you mean by that ?

[patricxian]

@SGaist said in Program throws issue "Failed to extract plugin meta data from .dll":

What do you mean by that ?

The plugin is created by myself, not belong to Qt library.

[patricxian]

I solve the problem. The issue is caused by the dll version.

[SGaist]

Your dll version ?