Open a file chooser with GTK 3.

file_chooser_dialog.c

/** file_chooser_dialog.c
 *
 * Open a  file chooser with GTK 3.
 *
 * COMPILE
 * gcc -Wall -o file_chooser_dialog file_chooser_dialog.c `pkg-config gtk+-3.0 --libs --cflags`
 *
 * EXAMPLE
 * ./file_chooser_dialog
 */

#include <gtk/gtk.h>

static void on_response(GtkFileChooserDialog *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
    GtkWidget* chooser =
            gtk_file_chooser_dialog_new("Open File",
                                        (GtkWindow*) window,
                                        GTK_FILE_CHOOSER_ACTION_OPEN,
                                        "_Cancel",
                                        GTK_RESPONSE_CANCEL,
                                        "_Open",
                                        GTK_RESPONSE_ACCEPT,
                                        NULL);

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

    // Show the dialog
    gtk_widget_show(chooser);

    // Start the GTK main loop
    gtk_main();

    return EXIT_SUCCESS;
}