Re: Data to Callback Functions

[Stefan Kost <kost imn htwk-leipzig de>]

Hi ruben,

Ruben Safir Secretary NYLXS wrote:
> Hello
>
> I'm trying to write a program for the clinical pharmacy department at
> the hospital.  I hoped to create a top_level window with a vbox.  The top
> of the vbox has some buttons and the bottom has a frame.  Depending on
> which button is clicked, a different 'form' would desplay below.
use the notebook widget for this.

> In order to do this I created several files, clinical.c clinical.h
> forms.c forms.h calculations.c calculations.h, so I could use the
> calculations for a future project.
>
> In order to retain access to everything, in fomrs.h I has a struct definition
>
> struc s1, which has membership of GtkWidgets which I hoped to assign to
> structure instances to pass to callback functions attacts as gpoint data,
> with is the last argument in g_signal_connect, such as follows
>
> g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (lbw_screen), &handle);
>
> where handle is my structure with the GtkWidgets stored.
>
> However, this is not working, and when I call the signal by clicking on
> the button, the structure is converted to a null pointer by the 
> gpointer cast and the screen almost looks like it goes out of scope in the
> debugger.
>
> How can I do this other than make the entire structure global?
The structure needs to be at least static, otherwise it will be gone, when you
leave the method.

> How can I get a callback fuction to gain access to it's parent
> windows and widgets?

Stean