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Here's the solution for Linux. You need to use the Xlib library:

#include <X11/Xlib.h>

int main(int argc, char *argv[])
{
    bool hasgui=true;
    Display *display;
    display=XOpenDisplay(NULL);
    if(!display)
        hasgui=false;
    else XCloseDisplay(display);
    //... your code here...
    if(hasgui) imshow("Yipee",myimage");
}

You need to install xlib11-xcb-dev package (on ubuntu/debian) and link your program to Xlib (-lxlib)

I don't know for Windows, if it can run without graphical interface (even if there is no screen attached).

Here's the solution for Linux. You need to use the Xlib library:

#include <X11/Xlib.h>

int main(int argc, char *argv[])
{
    bool hasgui=true;
    Display *display;
    display=XOpenDisplay(NULL);
    if(!display)
        hasgui=false;
    else XCloseDisplay(display);
    //... your code here...
    if(hasgui) imshow("Yipee",myimage");
    else imwrite( "output.jpg", image );
    return 0;
}

You need to install xlib11-xcb-dev package (on ubuntu/debian) and link your program to Xlib (-lxlib)

I don't know for Windows, if it can run without graphical interface (even if there is no screen attached).

Here's the solution for Linux. You need to use the Xlib library:

#include <X11/Xlib.h>

int main(int argc, char *argv[])
{
    bool hasgui=true;
    Display *display;
    display=XOpenDisplay(NULL);
    if(!display)
        hasgui=false;
    else XCloseDisplay(display);
    //... your code here...
    if(hasgui) imshow("Yipee",myimage");
imshow("Yipee", image");
    else imwrite( "output.jpg", image );
    return 0;
}

You need to install xlib11-xcb-dev package (on ubuntu/debian) and link your program to Xlib (-lxlib)

I don't know for Windows, if it can run without graphical interface (even if there is no screen attached).

Here's the solution for Linux. Linux. You need to use the Xlib Xlib library:

#include <X11/Xlib.h>

int main(int argc, char *argv[])
{
    bool hasgui=true;
    Display *display;
    display=XOpenDisplay(NULL);
    if(!display)
        hasgui=false;
    else XCloseDisplay(display);
    //... your code here...
    if(hasgui) imshow("Yipee", image");
    else imwrite( "output.jpg", image );
    return 0;
}

You need to install xlib11-xcb-dev xlib11-xcb-dev package (on ubuntu/debian) and link your program to Xlib (-lxlib)libx11 (-lx11)

I don't know for Windows, if it can run without graphical interface (even if there is no screen attached).

Here's the solution for Linux. You need to use the Xlib library:

#include <X11/Xlib.h>

int main(int argc, char *argv[])
{
    bool hasgui=true;
    Display *display;
    display=XOpenDisplay(NULL);
    if(!display)
        hasgui=false;
    else XCloseDisplay(display);
    //... your code here...
    if(hasgui) imshow("Yipee", image");
    else imwrite( "output.jpg", image );
    return 0;
}

You need to install xlib11-xcb-dev package (on ubuntu/debian) and link your program to libx11 (-lx11)

I don't know for Windows, if it can run without graphical interface (even if there is no screen attached).attached) - but probably there is no simple access to low-level features. Maybe you can try to query screen resolution or something similar to see if there's a screen.

Here's the solution for Linux. You need to use the Xlib library:

#include <X11/Xlib.h>

int main(int argc, char *argv[])
{
    bool hasgui=true;
    Display *display;
    display=XOpenDisplay(NULL);
    if(!display)
        hasgui=false;
    else XCloseDisplay(display);
    //... your code here...
    if(hasgui) imshow("Yipee", image");
    else imwrite( "output.jpg", image );
    return 0;
}

You need to install xlib11-xcb-dev package (on ubuntu/debian) and link your program to libx11 (-lx11)

I don't know for Windows, Windows, if it can run without graphical interface (even if there is no screen attached) - but probably there is no simple access to low-level features. Maybe you can try to query screen resolution or something similar to see if there's a screen.screen. I have no idea how to deal with this case.