Deploy qt desktop app 'Driver not loaded'

SGaist

The ODBC failure you had was because of a missing QCoreApplication based object.

Your current error comes from the fact that you are trying to show a widget while you created only a QCoreApplication. Qt widgets requires a QApplication object.

AdrianN17

@SGaist I don´t understand , do you mean this error to QODBC?

QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers:
QSqlDatabase: an instance of QCoreApplication is required for loading driver plugins
"Driver not loaded Driver not loaded"

This is QMYSQL error when I deploy my app and run. QTCreator gives me a better error report instead of opening my .exe app

Sorry if I also confused him by using 2 drivers

QMYSQL work fine with qtcreator, but no after deployment
QODBC only open database in qtcreator , but no work SELECT (I use the same queries for both)

Conection file conexion.cpp

#include "conexion.h"

conexion::conexion()
{

}

QSqlDatabase conexion::conecta()
{
    /*QSqlDatabase db;
    db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setUserName("root");
    db.setPassword("");
    db.setDatabaseName("tunqui_restaurante");*/

    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setDatabaseName("Driver={MySQL ODBC 8.0 ANSI Driver};Server=localhost;DATABASE=tunqui_restaurante;");
    db.setUserName("root");
    db.setPassword("");


    if (db.open()){
         qDebug() << "true";
    }
    else {
        qDebug() << db.lastError().text();
    }

    return db;
}

Conection file conexion.h

#ifndef CONEXION_H
#define CONEXION_H

#include <QtSql>


class conexion
{
public:
    conexion();
    QSqlDatabase conecta();
};

#endif // CONEXION_H

controller file controlador.cpp

#include "controlador.h"

controlador::controlador()
{

}

static QSqlDatabase con=conexion().conecta();

//ingresar

usuario controlador::logear(acceso ac)
{
    usuario us= usuario();

    QSqlQuery query(con);

    QString sentence= "SELECT ID_usuario,nombre,apellido,dni,telefono,correo,cargo,direccion FROM usuario WHERE user = :user and pass = :pass; ";
    query.prepare(sentence);
    query.bindValue(":user",ac.get_user());
    query.bindValue(":pass",ac.get_pass());


    query.exec();


    if (query.size()>0)
    {
        while(query.next())
        {
            us.set_ID_usuario(query.value("ID_usuario").toInt());
            us.set_nombre(query.value("nombre").toString());
            us.set_apellido(query.value("apellido").toString());
            us.set_dni(query.value("dni").toString());
            us.set_telefono(query.value("telefono").toString());
            us.set_correo(query.value("correo").toString());
            us.set_cargo(query.value("cargo").toInt());
            us.set_direccion(query.value("direccion").toString());

        }
    }


    return us;
}

jsulm

@AdrianN17

int main(int argc, char *argv[])
{
QApplication a(argc, argv); // <--- HERE
login w;
w.show();

return a.exec();

}

AdrianN17

@jsulm said in Deploy qt desktop app 'Driver not loaded':

int main(int argc, char *argv[])
{
QApplication a(argc, argv); // <--- HERE
login w;
w.show();

return a.exec();

}

I don't understand. What should it be there?

If I change QApplication for QCoreApplication = QWidget: Cannot create a QWidget without QApplication

Sorry I'm newbie using the QMySQL driver and libmysql.dll

The problem is after deploying my desktop app.

jsulm

@AdrianN17 said in Deploy qt desktop app 'Driver not loaded':

QApplication

instead of QCoreApplication.

AdrianN17

@jsulm Ok thanks, but I was using QApplication from the beginning.

jsulm

@AdrianN17 If you have "Cannot create a QWidget without QApplication" error with QApplication, then you're creating QWidget based class instance somewhere before QApplication instance is created. You need to check that. Do you have any static objects?

AdrianN17

@jsulm I only was tested using a QCoreApplication instead QApplication :

@SGaist said in Deploy qt desktop app 'Driver not loaded':

The very first object you must create is a QCoreApplication (or QQuiApplication/QApplication) otherwise the required internals won't be initialised.

Because I have that problem when I deploy and execute my app:

QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers:
QSqlDatabase: an instance of QCoreApplication is required for loading driver plugins
"Driver not loaded Driver not loaded"

Because so far, I only had that error doing the test. The only problem really is with QMysql driver not loaded

Excuse me if I confused you

jsulm

@AdrianN17 said in Deploy qt desktop app 'Driver not loaded':

I only was tested using a QCoreApplication instead QApplication

Again: if you're using widgets in your app you have to use QApplication.
And if you then have that error message then please check whether or not you're creating any QWidget based objects before QApplication or post whole code here, so we can check. Else I can't help you.

AdrianN17

@jsulm

QMYSQL - libmysql.dll mysql-5.7.26-winx64 driver

.pro

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target





win32: LIBS += -LC:/Users/Adrian/Desktop/mysql-5.7.26-winx64/lib/ -llibmysql

INCLUDEPATH += C:/Users/Adrian/Desktop/mysql-5.7.26-winx64/include
DEPENDPATH += C:/Users/Adrian/Desktop/mysql-5.7.26-winx64/include

QT DEBUG PLUGINS

01:57:42: Starting D:\Proyectos\Proyecto_Restaurante_Qt\build-restaurante_tunqui-Desktop_Qt_5_12_3_MSVC2017_64bit-Debug\debug\restaurante_tunqui.exe ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers" ...
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlite.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlite.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QSQLITE"
        ]
    },
    "archreq": 0,
    "className": "QSQLiteDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlite.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlited.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlited.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QSQLITE"
        ]
    },
    "archreq": 1,
    "className": "QSQLiteDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QSQLITE")
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlmysql.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlmysql.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QMYSQL3",
            "QMYSQL"
        ]
    },
    "archreq": 0,
    "className": "QMYSQLDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlmysql.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlmysqld.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlmysqld.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QMYSQL3",
            "QMYSQL"
        ]
    },
    "archreq": 1,
    "className": "QMYSQLDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QMYSQL3", "QMYSQL")
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlodbc.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlodbc.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QODBC3",
            "QODBC"
        ]
    },
    "archreq": 0,
    "className": "QODBCDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlodbc.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlodbcd.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlodbcd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QODBC3",
            "QODBC"
        ]
    },
    "archreq": 1,
    "className": "QODBCDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QODBC3", "QODBC")
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlpsql.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlpsql.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QPSQL7",
            "QPSQL"
        ]
    },
    "archreq": 0,
    "className": "QPSQLDriverPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlpsql.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlpsqld.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlpsqld.dll, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QPSQL7",
            "QPSQL"
        ]
    },
    "archreq": 1,
    "className": "QPSQLDriverPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("QPSQL7", "QPSQL")
loaded library "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlmysqld.dll"
true
QFactoryLoader::QFactoryLoader() checking directory path "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qdirect2d.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qdirect2d.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "direct2d"
        ]
    },
    "archreq": 0,
    "className": "QWindowsDirect2DIntegrationPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qdirect2d.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qdirect2dd.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qdirect2dd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "direct2d"
        ]
    },
    "archreq": 1,
    "className": "QWindowsDirect2DIntegrationPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("direct2d")
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qminimal.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qminimal.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qminimal.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qminimald.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qminimald.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 1,
    "className": "QMinimalIntegrationPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qoffscreen.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qoffscreen.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qoffscreen.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qoffscreend.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qoffscreend.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 1,
    "className": "QOffscreenIntegrationPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwebgl.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwebgl.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwebgl.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwebgld.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwebgld.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 1,
    "className": "QWebGLIntegrationPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwindows.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwindows.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "windows"
        ]
    },
    "archreq": 0,
    "className": "QWindowsIntegrationPlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwindows.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwindowsd.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwindowsd.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "windows"
        ]
    },
    "archreq": 1,
    "className": "QWindowsIntegrationPlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("windows")
QFactoryLoader::QFactoryLoader() checking directory path "D:/Proyectos/Proyecto_Restaurante_Qt/build-restaurante_tunqui-Desktop_Qt_5_12_3_MSVC2017_64bit-Debug/debug/platforms" ...
loaded library "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwindowsd.dll"
QFactoryLoader::QFactoryLoader() checking directory path "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platformthemes" ...
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platformthemes/qxdgdesktopportal.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platformthemes/qxdgdesktopportal.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "xdgdesktopportal",
            "flatpak",
            "snap"
        ]
    },
    "archreq": 0,
    "className": "QXdgDesktopPortalThemePlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/platformthemes/qxdgdesktopportal.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platformthemes/qxdgdesktopportald.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/platformthemes/qxdgdesktopportald.dll, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "xdgdesktopportal",
            "flatpak",
            "snap"
        ]
    },
    "archreq": 1,
    "className": "QXdgDesktopPortalThemePlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("xdgdesktopportal", "flatpak", "snap")
QFactoryLoader::QFactoryLoader() checking directory path "D:/Proyectos/Proyecto_Restaurante_Qt/build-restaurante_tunqui-Desktop_Qt_5_12_3_MSVC2017_64bit-Debug/debug/platformthemes" ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/Programas/QT/5.12.3/msvc2017_64/plugins/styles" ...
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/styles/qwindowsvistastyle.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/styles/qwindowsvistastyle.dll, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "windowsvista"
        ]
    },
    "archreq": 0,
    "className": "QWindowsVistaStylePlugin",
    "debug": false,
    "version": 330752
}


"The plugin 'D:/Programas/QT/5.12.3/msvc2017_64/plugins/styles/qwindowsvistastyle.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)" 
         not a plugin
QFactoryLoader::QFactoryLoader() looking at "D:/Programas/QT/5.12.3/msvc2017_64/plugins/styles/qwindowsvistastyled.dll"
Found metadata in lib D:/Programas/QT/5.12.3/msvc2017_64/plugins/styles/qwindowsvistastyled.dll, metadata=
{
    "IID": "org.qt-project.Qt.QStyleFactoryInterface",
    "MetaData": {
        "Keys": [
            "windowsvista"
        ]
    },
    "archreq": 1,
    "className": "QWindowsVistaStylePlugin",
    "debug": true,
    "version": 330752
}


Got keys from plugin meta data ("windowsvista")
QFactoryLoader::QFactoryLoader() checking directory path "D:/Proyectos/Proyecto_Restaurante_Qt/build-restaurante_tunqui-Desktop_Qt_5_12_3_MSVC2017_64bit-Debug/debug/styles" ...
loaded library "D:/Programas/QT/5.12.3/msvc2017_64/plugins/styles/qwindowsvistastyled.dll"
QFactoryLoader::QFactoryLoader() checking directory path "D:/Programas/QT/5.12.3/msvc2017_64/plugins/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/Proyectos/Proyecto_Restaurante_Qt/build-restaurante_tunqui-Desktop_Qt_5_12_3_MSVC2017_64bit-Debug/debug/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/Programas/QT/5.12.3/msvc2017_64/plugins/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "D:/Proyectos/Proyecto_Restaurante_Qt/build-restaurante_tunqui-Desktop_Qt_5_12_3_MSVC2017_64bit-Debug/debug/accessiblebridge" ...
QLibraryPrivate::unload succeeded on "D:/Programas/QT/5.12.3/msvc2017_64/plugins/sqldrivers/qsqlmysqld.dll" 
QLibraryPrivate::unload succeeded on "D:/Programas/QT/5.12.3/msvc2017_64/plugins/styles/qwindowsvistastyled.dll" 
QLibraryPrivate::unload succeeded on "D:/Programas/QT/5.12.3/msvc2017_64/plugins/platforms/qwindowsd.dll"

After deploy

alt text

*Profile and Release have the same result

Before deploy
alt text

AdrianN17

Change my odbc conection

QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setDatabaseName("Driver={MySQL ODBC 8.0 ANSI Driver};Server=localhost;DATABASE=tunqui_restaurante;");
    db.setUserName("root");
    db.setPassword("");

and my query

//if (query.size()>0) comment this line
    {
 while(query.next())
        {
            us.set_ID_usuario(query.value("ID_usuario").toInt());
            us.set_nombre(query.value("nombre").toString());
            us.set_apellido(query.value("apellido").toString());
            us.set_dni(query.value("dni").toString());
            us.set_telefono(query.value("telefono").toString());
            us.set_correo(query.value("correo").toString());
            us.set_cargo(query.value("cargo").toInt());
            us.set_direccion(query.value("direccion").toString());

        }
//}

ODBC conection work fine and I can log in my app (error code fixed)

But when I deploy with windeployqt I had the same problem with QMYSQL

windeployqt command : windeployqt restaurante_tunqui.exe

alt text

AdrianN17

I found the solution:

    
#include "controlador.h"
#include "qmessagebox.h"

controlador::controlador()
{

}

static QSqlDatabase con=conexion().conecta();

to

usuario controlador::logear(acceso ac)
{
    usuario us= usuario();

    QSqlDatabase con=conexion().conecta();

    QSqlQuery query(con);

#include "vistas/login.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication::libraryPaths();
    QApplication a(argc, argv);
    login w;
    w.show();

    return a.exec();
}

https://forum.qt.io/topic/66480/deploy-on-windows/14

I think because static db conection, windeployqt work fine

SGaist

There's really no need for any static (nor class variable) QDatabase object. QDatabase already provide all methods needed to create and retrieve database connection when needed.

AdrianN17

Sure. It was a mistake using static QSqlDatabase object, because only fail at the deployment.

Thanks guys.