Open a native file chooser with GTK 3 if one is available.

file_chooser_native.c

/** file_chooser_native.c
 *
 * Open a native file chooser with GTK 3 if one is available.
 *
 * COMPILE
 * gcc -Wall -o file_chooser_native file_chooser_native.c `pkg-config gtk+-3.0 --libs --cflags`
 *
 * EXAMPLE
 * ./file_chooser_native
 */

#include <gtk/gtk.h>

static void on_response(GtkNativeDialog *chooser, int response) {
    if (response == GTK_RESPONSE_ACCEPT) {
        GFile *file = gtk_file_chooser_get_file(GTK_FILE_CHOOSER(chooser));
        gchar* path = g_file_get_path(file);
        puts(path);
        g_free(path);
        g_object_unref(file);
    }
    g_object_unref(chooser);
}

int main(int argc, char** argv) {
    // Initialize GTK
    gtk_init(&argc, &argv);

    // Create the window
    GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

    // Create the FileChooser
    GtkFileChooserNative *chooser =
            gtk_file_chooser_native_new("Open File",
                                         (GtkWindow*) window,
                                         GTK_FILE_CHOOSER_ACTION_OPEN,
                                         "_Open",
                                         "_Cancel");

    // Connect the "response" signal handler
    g_signal_connect(chooser, "response", G_CALLBACK(on_response), NULL);

    // Show the dialog
    gtk_native_dialog_show(GTK_NATIVE_DIALOG(chooser));

    // Start the GTK main loop
    gtk_main();

    return EXIT_SUCCESS;
}