error: invalid type argument of ‘->’ (have ‘int’)

huangya90 · **Joined:** Wed Oct 10, 2012 11:19 am **Posts:** 3

I am studng how to use gtk_file_selection_new funcation. But when I build the following code with cmd

Quote:

gcc file_selection.c -o file_selection `pkg-config --cflags --libs gtk+-2.0 `.

, gcc displays the error: invalid type argument of ‘->’ (have ‘int’).I test the code with both libgtk2.20.1 and libgtk3.4.2.Same error.

Code:

#include        <gtk/gtk.h>

GtkWidget *FileSelection;
void OpenFile(GtkWidget *widget,gpointer *data);
void button_event(GtkWidget *widget, gpointer *data);

int main(int argc,char *argv[ ])
{
        GtkWidget *window;
        GtkWidget *button;

        gtk_init(&argc,&argv);
        window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
        gtk_widget_set_size_request(window,100,100);
        gtk_signal_connect(GTK_OBJECT(window),"destroy",G_CALLBACK(gtk_main_quit),NULL);

        button=gtk_button_new_with_label("open file");
        gtk_signal_connect(GTK_OBJECT(button),"clicked",G_CALLBACK(button_event),NULL);
        gtk_container_add(GTK_CONTAINER(window),button);

        gtk_widget_show(button);
        gtk_widget_show(window);
        gtk_main();
}

void button_event(GtkWidget *widget,gpointer *data)
{
        FileSelection= gtk_file_selection_new("file selecton");
        g_signal_connect(GTK_OBJECT(GTK_FILL_SELECTION(FileSelection)->ok_button),"clicked",GTK_SIGNAL_FUNC(OpenFile),NULL);
        gtk_widget_show(FileSelection);
}

void OpenFile(GtkWidget *widget,gpointer *data)
{
        g_printf("%s\n",gtk_file_selection_get_filename(GTK_FILE_SELECTION(FileSelection)) );
}

Lounger · **Joined:** Wed Oct 10, 2012 5:42 pm **Posts:** 5

Hi all.
I am newbie here :)

It looks like you have to write:

Code:

g_signal_connect(GTK_OBJECT(GTK_FILE_SELECTION(FileSelection)->ok_button),"clicked",GTK_SIGNAL_FUNC(OpenFile),NULL);

instead of your:

Code:

g_signal_connect(GTK_OBJECT(GTK_FILL_SELECTION(FileSelection)->ok_button),"clicked",GTK_SIGNAL_FUNC(OpenFile),NULL);

i.e. you wrote GTK_FILL_SELECTION and should GTK_FILE_SELECTION

tadeboro · **Posted:** Wed Oct 10, 2012 5:58 pm

Hello and welcome to the GTK+ forums (both of you;)!

Actually, none of the code is correct. Widgets are opaque structures whose contents should not be manipulated directly (you can only use public API). Use gtk_dialog_run() or something to get notified when user made selection. BTW, what would your code do if user pressed cancel or closed dialog using X in window title bar?

Cheers,
Tadej

huangya90 · **Joined:** Wed Oct 10, 2012 11:19 am **Posts:** 3

Lounger wrote:

Hi all.
I am newbie here :)

It looks like you have to write:

Code:

g_signal_connect(GTK_OBJECT(GTK_FILE_SELECTION(FileSelection)->ok_button),"clicked",GTK_SIGNAL_FUNC(OpenFile),NULL);

instead of your:

Code:

g_signal_connect(GTK_OBJECT(GTK_FILL_SELECTION(FileSelection)->ok_button),"clicked",GTK_SIGNAL_FUNC(OpenFile),NULL);

i.e. you wrote GTK_FILL_SELECTION and should GTK_FILE_SELECTION

Thank you! I am too careless!

huangya90 · **Joined:** Wed Oct 10, 2012 11:19 am **Posts:** 3

Quote:

BTW, what would your code do if user pressed cancel or closed dialog using X in window title bar?

these code is just a part of whole project

tadeboro · **Posted:** Thu Oct 11, 2012 11:06 am

Hi.

huangya90 wrote:

these code is just a part of whole project

This doesn't change a thing. Your code is using undocumented private API and it'll break eventually. Try compiling your app in GTK+-3.0 and what I mean.

Cheers,
Tadej

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