GTK question

[nchancock]

Here's a question for all you GTK gurus out there ...

 

 

I have a program where I want to take the number displayed on a label (text), convert it to an integer, manipulate it (subtract the integer taken from a spin button), convert the result back to text and then write that text back to the label (thus displaying the resultant value).

 

As I am incredibly new to this I am unsure as to what all is involved. What issues might arise? I will post the snippet of code that I have written below:

 

void
on_ResearchDiceSpinButton_changed      (GtkEditable     *editable,
                                       gpointer         user_data)
{
gdouble dice;
gdouble IPCs, IPCs_new;
G_CONST_RETURN gchar *IPCstr;
gchar *IPCstr_old;
gchar *IPCstr_new;
gchar *IPCstr_buffer;
gchar *IPCcost;
GtkWidget *ResearchDiceSpinButton = lookup_widget( GTK_WIDGET(editable),
               "ResearchDiceSpinButton");
GtkWidget *ResearchDiceTotalIPCCostLabel = lookup_widget( GTK_WIDGET(editable),
                "ResearchDiceTotalIPCCostLabel");
GtkWidget *DevelopWeaponsIPCsRemainingLabel = lookup_widget( GTK_WIDGET(editable),
                "DevelopWeaponsIPCsRemainingLabel");

// Get the number of dice from the spin button
dice = (gdouble) gtk_spin_button_get_value_as_int( GTK_SPIN_BUTTON(ResearchDiceSpinButton) );

// Set the IPC cost Label text from the number of dice (*5)
if (dice == 0)
{
 gtk_label_set_label( GTK_LABEL(ResearchDiceTotalIPCCostLabel), g_ascii_dtostr( IPCcost, 3, (dice*5.0)));
}
else
{
 gtk_label_set_label( GTK_LABEL(ResearchDiceTotalIPCCostLabel), "0");
}

// Get the remaining IPCs from the label 
IPCstr_old = gtk_label_get_text(GTK_LABEL(DevelopWeaponsIPCsRemainingLabel));
IPCs = g_strtod( IPCstr_old, NULL ); //convert to a double
IPCs_new = (IPCs - dice*5.0);  //calculate how many are left
IPCstr_new = g_strconcat( "<b>", g_ascii_dtostr( IPCstr_buffer, 3, IPCs_new), "</b>", NULL); // concat the new label string to include Pango markup
// set the new IPCs Remaining label text
gtk_label_set_label( GTK_LABEL(DevelopWeaponsIPCsRemainingLabel), IPCstr_new );
}

 

Maybe I should say that I am using Anjuta/Glade to design the project.

 

When I build the project, all goes well. On execution, however, the program seg faults when the spin button up arrow is clicked or the value inside is deleted.

 

What am I doing wrong?

 

Nate

[nchancock]

Heh, I solved it. Turned out that the function g_strdup_printf() worked instead. I found it in on e of the example codes.

 

Anyway, what do you guys think about the g_random_int_range() function? Part of the code that I am writing needs to generate ALOT of 6-sided die rolls at a certain point. Is this function going to be too slow, or is there a better one?