MESSAGE
| DATE | 2004-08-30 |
| FROM | Ruben Safir Secretary NYLXS
|
| SUBJECT | Subject: [hangout] GTK: When 0 + 1 = 0
|
Hello
I've walked into one of these unsummountable mountains that people go through
occastionally when learning a new programming enviroment.
I'm writing a GTK program in C and I have a window with 2 radio buttons and 2 GtkEditable
text entry boxes.
I want to validate the data by my own code (no spin button) and the code looks like this
for my callback function:
static void validate_weight(GtkWidget *widget,gpointer a){
gint pos = 0;
gint len = 0;
gint i = 0;
lbw.weight = 0;
GtkWidget * dialog;
pos = gtk_editable_get_position(GTK_EDITABLE(widget));
len = pos + 1;
gchar* text = g_new(gchar,len);
text = gtk_editable_get_chars (GTK_EDITABLE(widget), 0, -1);
g_print("POS: %d\n",pos);
g_print("TEXT: %s\n",text);
for( i=0; i g_print("THIS CHAR=> %c\n This is INDEX=> %d",text[i],i);
if(!isdigit(text[i])){
dialog = gtk_message_dialog_new (GTK_WINDOW(widget), GTK_DIALOG_MODAL, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "Entry Digits for Weight in Pounds");
g_signal_connect_swapped (GTK_OBJECT (dialog), "response", G_CALLBACK (gtk_widget_destroy), GTK_OBJECT (dialog));
g_signal_handlers_block_by_func (GTK_OBJECT (widget), validate_weight, a);
gtk_widget_show(dialog);
gtk_editable_insert_text (GTK_EDITABLE(widget), NULL, 0, 0);
g_signal_handlers_unblock_by_func (GTK_OBJECT (widget), validate_weight, a);
g_signal_stop_emission_by_name (GTK_OBJECT (widget), "validate_weight");
g_free (text);
return;
}
}
lbw.weight = atoi(text);
}
void lbw_calc(GtkWidget * widget, gpointer a){
return;
}
Originally I have the line:
for( i=0; i
as
for( i=0; i
and the result was that this code never checked the first entered charactor into the box.
When I run this through the debugger, it gets to the line:
len = pos + 1;
and it displays that pos is zero and len is zero. In fact, it just swings through this code
completely out of order. I have no idea what gtk_main is doing, but when I code len = pos +0 and pos is
zero, I expect len to be 1.
Also, it seems that the line
pos = gtk_editable_get_position(GTK_EDITABLE(widget));
returns a huge number. I'm completely confused at this point. There must be a reason that this behavior is
happening, but I have no clue as to why.
I've tarred up this entire program and put it at http:///www.nylxs.com/images/clinical.tgz if anyone want to
look at it and help.
Ruben
--
__________________________
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