On Wed, 4 Jul 2018, Roger Matthews via gtk-app-devel-list wrote:
I'm using gtk+3.10 on Ubuntu 14.04 and am writing an application in C, with
the user interface constructed with a builder.ui file. I am using spinbuttons
to create and change Cairo drawings of some mathematical functions. The
spinbuttons’ adjustment value is initialised from the builder.ui file and can
then can be changed with the spinbutton, I also read values from a text file to
create and change the drawings, which after being read from the file
(containing many drawing parameters) these parameters are then written to
seperate files for each parameter which are then read into the drawing function
in drawing.c, which is compiled together with mymain.c.
This works ok (the drawings change), except that when reading the values
from the file I would also like to update the values displayed in the
spinbuttons so that they match those in the file and with the correctly updated
drawings.
I have tried using the following, taken from Foundations of GTK+
Development, by Andrew Krause (gtk+2):
gtk_spin_button_set_value (GtkSpinButton *spin_drawingparameter1,
int drawingparameter1);
in the callback for the spinbutton *spin_readfile (which makes the
choice between reading/not reading the file).
When attempting to compile I receive this error message:
mymain.c: In function ‘callback_readfile’:
mymain.c:1124:28: error: expected expression before ‘GtkSpinButton’
gtk_spin_button_set_value (GtkSpinButton *spin_drawingparameter1,
int drawingparameter1);
Try
gtk_spin_button_set_value(GTK_SPIN_BUTTON(spin_drawingparameter1),...
You have a broken attempt at a cast.
--
Allin Cottrell
Department of Economics
Wake Forest University
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