MESSAGE
| DATE | 2004-08-23 |
| FROM | Ruben Safir Secretary NYLXS
|
| SUBJECT | Subject: [hangout] Data to Callback Functions
|
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.
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?
How can I get a callback fuction to gain access to it's parent
windows and widgets?
Ruben
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