Combining Qt with GTK-only one problem!

**hakermania** · June 28th, 2012

I am using this code:

Code:

g_signal_connect(showapp_option, "activate", G_CALLBACK(&MainWindow::show_app), appindicator);

so as to connect my indicator menu item to the function show_app(), and it works just fine, irregardless the fact that I get the following warning:

Code:

warning: converting from 'void (MainWindow::*)()' to 'GCallback {aka void (*)()}' [-Wpmf-conversions]

I don't understand the warning as I've never worked with the gtk libs before... Anyway, this isn't the real reason I'm posting here, but it is maybe related to it.

The problem is that I cannot use 'this' (which stands for the MainWindow's call) from inside show_app() function, because the program crashes!

Why I cannot use 'this' inside the function? And, more importantly, how do I make it work?

**SledgeHammer_999** · June 28th, 2012

As far as I can tell this is a problem relating to C not mixing well with C++.

What type is "showapp_option"?

**hakermania** · June 30th, 2012

Originally Posted by SledgeHammer_999

As far as I can tell this is a problem relating to C not mixing well with C++.

What type is "showapp_option"?

After some inspection, that's my full updated code(which still doesn't work though):

Code:

void show_app(MainWindow *data)
{
    //crashes here
    data->show();
}


void MainWindow::make_indicator()
{
    if(appindicator){
        //appindicator has already been created
        return;
    }
    appindicator = app_indicator_new("Format Junkie Indicator", "formatjunkie", APP_INDICATOR_CATEGORY_APPLICATION_STATUS);
    GtkWidget* showapp_option;
    GtkWidget* indicatormenu = gtk_menu_new();
    GtkWidget* item = gtk_menu_item_new_with_label("Format Junkie main menu");
    gtk_menu_item_set_submenu(GTK_MENU_ITEM(item), indicatormenu);

    showapp_option = gtk_menu_item_new_with_label("Show App!");
    g_signal_connect(showapp_option, "activate", G_CALLBACK(show_app), this);
    gtk_menu_shell_append(GTK_MENU_SHELL(indicatormenu), showapp_option);

    gtk_widget_show_all(indicatormenu);
    app_indicator_set_status(appindicator, APP_INDICATOR_STATUS_ACTIVE);
    app_indicator_set_attention_icon(appindicator, "dialog-warning");

    app_indicator_set_menu(appindicator, GTK_MENU (indicatormenu));
}

I think that now things are more clear for you