I want to write to console

[8Observer8]

Hi,

I build my application how "release" and add all .dll's. When I run my application from console I don't see ouput:

#include <QGLFormat>
#include <QGLWidget>
#include <QString>
#include <iostream>
#include <QApplication>
 
int main( int argc, char *argv[] )
{
    QApplication app( argc, argv );
 
    std::cout << "Hello" << std::endl;
    fflush(stdout);
 
    QGLFormat format;
    format.setVersion( 4, 3 );
    QGLFormat::setDefaultFormat( format );
 
    QGLWidget w;
    w.makeCurrent();
 
    QString vendor( QLatin1String( reinterpret_cast<const char*>( glGetString( GL_VENDOR ) ) ) );
    std::cout << "Vendor: " << vendor.toStdString() << std::endl;
 
    QString renderer( QLatin1String( reinterpret_cast<const char*>( glGetString( GL_RENDERER ) ) ) );
    std::cout << "Renderer: " << renderer.toStdString() << std::endl;
 
    QString versionOfGL( QLatin1String(reinterpret_cast<const char*>( glGetString( GL_VERSION ) ) ) );
    std::cout << "Version: " << versionOfGL.toStdString() << std::endl;
 
    QString versionGLSL( QLatin1String(reinterpret_cast<const char*>( glGetString( GL_SHADING_LANGUAGE_VERSION ) ) ) );
    std::cout << "GLSL: "<< versionGLSL.toStdString() << std::endl;
 
    return app.exec();
}

#include <QGLFormat>
#include <QGLWidget>
#include <QString>
#include <iostream>
#include <QApplication>

int main( int argc, char *argv[] )
{
    QApplication app( argc, argv );

    std::cout << "Hello" << std::endl;
    fflush(stdout);

    QGLFormat format;
    format.setVersion( 4, 3 );
    QGLFormat::setDefaultFormat( format );

    QGLWidget w;
    w.makeCurrent();

    QString vendor( QLatin1String( reinterpret_cast<const char*>( glGetString( GL_VENDOR ) ) ) );
    std::cout << "Vendor: " << vendor.toStdString() << std::endl;

    QString renderer( QLatin1String( reinterpret_cast<const char*>( glGetString( GL_RENDERER ) ) ) );
    std::cout << "Renderer: " << renderer.toStdString() << std::endl;

    QString versionOfGL( QLatin1String(reinterpret_cast<const char*>( glGetString( GL_VERSION ) ) ) );
    std::cout << "Version: " << versionOfGL.toStdString() << std::endl;

    QString versionGLSL( QLatin1String(reinterpret_cast<const char*>( glGetString( GL_SHADING_LANGUAGE_VERSION ) ) ) );
    std::cout << "GLSL: "<< versionGLSL.toStdString() << std::endl;

    return app.exec();
}

To copy to clipboard, switch view to plain text mode 

[anda_skoa]

Since you wrote .dll I assume you are on Windows.
Have you added

CONFIG += console

CONFIG += console

To copy to clipboard, switch view to plain text mode 

to your .pro file?

Cheers,
_

[8Observer8]

Yes, it works but very long in first time

---

Added after 16 minutes:

It is not problem. Thank you!

I have Asus X53S. When I run this application I see:

Vendor: Intel
Renderer: Intel(R) HD Graphics Family
Version: 3.0.0 - Build 8.15.10.2291
GLSL: 1.30 - Intel Build 8.15.10.2291

When I right click on .exe and select "Run with graphics processor" -> "High-performence NVIDIA processor" I see:

Vendor: NVIDIA Corporation
Renderer: GeForce GT 540M/PCI/SSE2
Version: 4.1.0
GLSL: 4.10 NVIDIA via Cg compiler

How to check second variant for Qt by default?

[8Observer8]

Changing graphics processor depends on OS