Re: can I pass user data to a button callback?

[Leandro A. F. Pereira]

On Tue, 2005-02-15 at 00:34 +0100, Felix Kater wrote:

>can I pass (a pointer to) user data to a button's callback? The compiler
>wants me to create button callbacks like void (*)(void) -- but what I
>need is void (*)(void*), at least for the "pressed" and "released"
>signals


You may try the following untested code:


typedef struct _MyData MyData;

struct _MyData {
        char *text;
};

void my_callback(GtkWidget *wid, gpointer data)
{
        MyData *mydata = (MyData *)data;

        g_print("data: %s\n", mydata->text);
}

void some_function()
{
        MyData *mydata;
        GtkWidget *button;

        button = gtk_button_new_with_label("Foo");
        gtk_widget_show(button);

        mydata = g_new0(MyData);
        mydata->text = g_strdup("Bar");

        g_signal_connect(G_OBJECT(button), "clicked",
                         (GCallback) my_callback, mydata);
}


        Leandro


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