通过GTK获取dpi设置

sudo apt-get install libgtk-3-dev

#include <gtk/gtk.h>
#include<stdio.h>

int main(int argc, char *argv[]) {
    gtk_init(&argc, &argv);

    GdkScreen *screen = gdk_screen_get_default();
    gint dpi = gdk_screen_get_resolution(screen);

    printf("DPI: %d\n", dpi);

    return 0;
}

gcc -o get_dpi get_dpi.c `pkg-config --cflags --libs gtk+-3.0`

./get_dpi