Why shows error message when generating application release

ChrisW67

The error message is telling you that it does not have the proper libraries available in the enviornment the executable is running.

Options:

There are (incorrect) Qt libraries on the system PATH found before those you intend.
Your libraries are from the wrong version of Qt (often this is because you have pulled the libs supporting Qt Creator rather than those you built against).
Your libraries are from the correct version of Qt but are the debug rather than release versions
There are no libraries to be found.

The missing function should be in Qt5Core.dll library built with MingW.

Please post the result of :

Windows command prompt TREE from the directory containing the EXE you are running
The value of PATH

lincoln

Hello again friends, I was able to solve my problem, I was checking in the advanced configuration of the system and it happened that it had several values, in the PATH variable with paths to the Qt installation folder, so I deleted them all and with that I could solve my problem, thanks for your answers.

now the problem is with respect to the database, I managed to generate the executable, add all the libraries you need, it happens that it does not show anything when I run it.

The application is already running, but the data is not displayed, which it queries from the DB.

ChrisW67

QSqlDatabase::open() returns true?

lincoln

Yes, the connection returns true, when I test it in Qt Creator everything is fine, but when I test it on another pc, the data is not shown.

SGaist

Did you properly deploy all dependencies ? Including the ones for the SQL driver you are using ?

lincoln

This post is deleted!

lincoln

@SGaist
Of course, as you can see in the previous image that I publish, there are all the dependencies, those of the database and others that the application needs, which automatically adds windeployqt, and those that I add, manually such as:

libpq.dll
libcrypto-1_1-x64.dll
libiconv-2.dll
libintl-8.dll
libssl-1_1-x64.dll.

I am using PostgreSQL version 13.3 and Qt 5.15.2. Both 64-bit

These libraries correspond to PostgreSQL, as I did my tests in Qt Creator, they work fine there, but when I create the exe and run from there, nothing happens.

Even so, the data is not shown; And it doesn't occur to me what else it could be.

Here run from the Qt Creator, the data is shown without problems, which does not happen when I deploy the application.

jsulm

@lincoln said in Why shows error message when generating application release:

And it doesn't occur to me what else it could be

Set QT_DEBUG_PLUGINS to 1 before starting you app from terminal and put the output here.
https://doc.qt.io/qt-5/debug.html

lincoln

@jsulm Thanks for your answer, but I don't really know how to do what you tell me, thank you anyway.

JonB

@lincoln
Use the forum Search for QT_DEBUG_PLUGINS. We don't want to answer the same question from many users over and over. It's also in the docs at Environment Variables Recognized by Qt. You need to read and act on these.

SGaist

@lincoln said in Why shows error message when generating application release:

Here run from the Qt Creator, the data is shown without problems, which does not happen when I deploy the application.

Do you run that deployed version on your machine or on a different machine ?

lincoln

@SGaist First I tried it on my machine, and then I took it to a different one, where the Qt was not installed, and the same result.

lincoln

@JonB ok, thanks

SGaist

Then the next step is to start your application from the command line with QT_DEBUG_PLUGINS set to 1 to see what is going on.

lincoln

This post is deleted!

lincoln

@SGaist ok thanks, i'll find out how to do that.

lincoln

THIS IS A MESSAGE THAT IS DISPLAYED AFTER STARTING THE APP WITH QT_DEBUG_PLUGINS

QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/6.1.2/mingw81_64/plugins/sqldrivers" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/sqldrivers/qsqlite.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_64/plugins/sqldrivers/qsqlite.dll, metadata=
{
"IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
"MetaData": {
"Keys": [
"QSQLITE"
]
},
"archreq": 0,
"className": "QSQLiteDriverPlugin",
"debug": false,
"version": 393472
}

Got keys from plugin meta data QList("QSQLITE")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/sqldrivers/qsqlodbc.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_64/plugins/sqldrivers/qsqlodbc.dll, metadata=
{
"IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
"MetaData": {
"Keys": [
"QODBC"
]
},
"archreq": 0,
"className": "QODBCDriverPlugin",
"debug": false,
"version": 393472
}

Got keys from plugin meta data QList("QODBC")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/sqldrivers/qsqlpsql.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_64/plugins/sqldrivers/qsqlpsql.dll, metadata=
{
"IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
"MetaData": {
"Keys": [
"QPSQL"
]
},
"archreq": 0,
"className": "QPSQLDriverPlugin",
"debug": false,
"version": 393472
}

Got keys from plugin meta data QList("QPSQL")
loaded library "C:/Qt/6.1.2/mingw81_64/plugins/sqldrivers/qsqlpsql.dll"
QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/6.1.2/mingw81_64/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/platforms/qdirect2d.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_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": 393472
}

Got keys from plugin meta data QList("direct2d")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/platforms/qminimal.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_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": 393472
}

Got keys from plugin meta data QList("minimal")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/platforms/qoffscreen.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_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": 393472
}

Got keys from plugin meta data QList("offscreen")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/platforms/qwindows.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_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": 393472
}

Got keys from plugin meta data QList("windows")
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Downloads/build-monitoreo_xertek-Desktop_Qt_6_1_2_MinGW_64_bit-Release/release/platforms" ...
loaded library "C:/Qt/6.1.2/mingw81_64/plugins/platforms/qwindows.dll"
QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/6.1.2/mingw81_64/plugins/platformthemes" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Downloads/build-monitoreo_xertek-Desktop_Qt_6_1_2_MinGW_64_bit-Release/release/platformthemes" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/6.1.2/mingw81_64/plugins/styles" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/styles/qwindowsvistastyle.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_64/plugins/styles/qwindowsvistastyle.dll, metadata=
{
"IID": "org.qt-project.Qt.QStyleFactoryInterface",
"MetaData": {
"Keys": [
"windowsvista"
]
},
"archreq": 0,
"className": "QWindowsVistaStylePlugin",
"debug": false,
"version": 393472
}

Got keys from plugin meta data QList("windowsvista")
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Downloads/build-monitoreo_xertek-Desktop_Qt_6_1_2_MinGW_64_bit-Release/release/styles" ...
loaded library "C:/Qt/6.1.2/mingw81_64/plugins/styles/qwindowsvistastyle.dll"
QSqlDatabasePrivate::removeDatabase: connection 'qt_sql_default_connection' is still in use, all queries will cease to work.
QSqlDatabasePrivate::addDatabase: duplicate connection name 'qt_sql_default_connection', old connection removed.
QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/6.1.2/mingw81_64/plugins/iconengines" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/iconengines/qsvgicon.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_64/plugins/iconengines/qsvgicon.dll, metadata=
{
"IID": "org.qt-project.Qt.QIconEngineFactoryInterface",
"MetaData": {
"Keys": [
"svg",
"svgz",
"svg.gz"
]
},
"archreq": 0,
"className": "QSvgIconPlugin",
"debug": false,
"version": 393472
}

Got keys from plugin meta data QList("svg", "svgz", "svg.gz")
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Downloads/build-monitoreo_xertek-Desktop_Qt_6_1_2_MinGW_64_bit-Release/release/iconengines" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/6.1.2/mingw81_64/plugins/imageformats" ...
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qgif.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qgif.dll, metadata=
{
"IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
"MetaData": {
"Keys": [
"gif"
],
"MimeTypes": [
"image/gif"
]
},
"archreq": 0,
"className": "QGifPlugin",
"debug": false,
"version": 393472
}

Got keys from plugin meta data QList("gif")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qico.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qico.dll, metadata=
{
"IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
"MetaData": {
"Keys": [
"ico",
"cur"
],
"MimeTypes": [
"image/vnd.microsoft.icon",
"image/vnd.microsoft.icon"
]
},
"archreq": 0,
"className": "QICOPlugin",
"debug": false,
"version": 393472
}

Got keys from plugin meta data QList("ico", "cur")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qjpeg.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qjpeg.dll, metadata=
{
"IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
"MetaData": {
"Keys": [
"jpg",
"jpeg"
],
"MimeTypes": [
"image/jpeg",
"image/jpeg"
]
},
"archreq": 0,
"className": "QJpegPlugin",
"debug": false,
"version": 393472
}

Got keys from plugin meta data QList("jpg", "jpeg")
QFactoryLoader::QFactoryLoader() looking at "C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qsvg.dll"
Found metadata in lib C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qsvg.dll, metadata=
{
"IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
"MetaData": {
"Keys": [
"svg",
"svgz"
],
"MimeTypes": [
"image/svg+xml",
"image/svg+xml-compressed"
]
},
"archreq": 0,
"className": "QSvgPlugin",
"debug": false,
"version": 393472
}

Got keys from plugin meta data QList("svg", "svgz")
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Downloads/build-monitoreo_xertek-Desktop_Qt_6_1_2_MinGW_64_bit-Release/release/imageformats" ...
loaded library "C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qgif.dll"
loaded library "C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qico.dll"
loaded library "C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qjpeg.dll"
loaded library "C:/Qt/6.1.2/mingw81_64/plugins/imageformats/qsvg.dll"
QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/6.1.2/mingw81_64/plugins/accessible" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Downloads/build-monitoreo_xertek-Desktop_Qt_6_1_2_MinGW_64_bit-Release/release/accessible" ...
QSqlDatabasePrivate::addDatabase: duplicate connection name 'qt_sql_default_connection', old connection removed.
La carpeta ya existe
QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/6.1.2/mingw81_64/plugins/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "C:/Users/USER/Downloads/build-monitoreo_xertek-Desktop_Qt_6_1_2_MinGW_64_bit-Release/release/accessiblebridge" ...

SGaist

@lincoln said in Why shows error message when generating application release:

QSqlDatabasePrivate::addDatabase: duplicate connection name 'qt_sql_default_connection', old connection removed.

You are still creating multiple QSqlDatabase objects using the default connection. One might be wrong.

lincoln

@SGaist I changed the code in this way, but now it does not connect to the database, I think it is worse.

DbConection class

#ifndef DBCONECTION_H
#define DBCONECTION_H
#include <QSqlDatabase>
#include <QSqlError>

class DbConection
{
public:
  DbConection();
  bool connect(const QString &dbName);
  QString errorMessage(){return _errorMessage;}
  QSqlDatabase getDataBase();
//  void removeDb();


private:
  QString _errorMessage;
  QString mdbName;

};

#endif // DBCONECTION_H

#include "dbconection.h"


DbConection::DbConection(){

}

bool DbConection::connect(const QString &dbName)
{
  mdbName=dbName;
  auto db=QSqlDatabase::addDatabase("QPSQL",dbName);
  if(!db.isDriverAvailable("QPSQL")){
      _errorMessage=db.lastError().driverText();
      return false;
    }
  db.setDatabaseName("monitoreo_db");
  db.setPort(5432);
  db.setHostName("127.0.0.1");
  db.setUserName("postgres");
  db.setPassword("2311046");

  if(!db.open()){
      _errorMessage=db.lastError().databaseText();
      return false;
    }

  return true;

}

QSqlDatabase DbConection::getDataBase()
{

  return QSqlDatabase::database(mdbName);

}

BussinesLayer class:

#ifndef BUSSINESLAYER_H
#define BUSSINESLAYER_H

#include <QSqlQuery>
#include <QSqlError>
#include "dbconection.h"

class BussinesLayer : public QObject
{

public:
  BussinesLayer();  
  QVariantList selectData(QVariant id);
  
private:
  QString _errorMessage;
  QString _errorCode;  
  DbConection db;
  
};

#endif // BUSSINESLAYER_H


#include "bussineslayer.h"

BussinesLayer::BussinesLayer()
{

  db.connect("monitoreo");

}

QVariantList BussinesLayer::selectData(QVariant id)
{
  QVariantList dataList;
  QSqlQuery qry(db.getDataBase());
  qry.prepare("SELECT * FROM grupo_minero WHERE id=?");
  qry.addBindValue(id);
  if(!qry.exec()){
    _errorMessage=qry.lastError().text();
    return dataList;
}        
  return dataList;

}

now this message comes out

😟😠

jsulm

@lincoln said in Why shows error message when generating application release:

DbConection::connect(const QString &dbName)

^Where do you call it now in your code? You need to call it once before using the database connection.