Re: Problem with GtkCList a dynamically creating with N columns...

["Timothy M. Shead" <tshead k-3d com>]

Wrinkled Shirt wrote:

> Hi guys,
>
> I looked through the archives for a solution to this problem, but the 
> only solution I found still seg-faulted for me. Basically, if you want 
> to create a GtkCList with titles, you need to use the function call
>
> GtkWidget * grid;
> char *blankrow[] = {"", "", "", ""};
>
> gtk_clist_new_with_titles(4, blankrow);
>
> The problem is, since I want to build the GtkCList with the result of an 
> SQL query, I'm not going to know ahead of time exactly how many columns 
> are going to be needed. I will be able to find out how many columns are 
> needed after the program has started, and use that to dynamically create 
> the blankrow, but so far, every way I've tried has come up empty. 
> Hard-coding the blankrow like I did above isn't an option.
>
> My question is this: how do I create blankrow of N columns containing N 
> ""'s, during runtime? Maybe this is more of a C question than a Gtk 
> question... if anybody could help, I'd really appreciate it. I'm going 
> nuts here.
>
> The only solution put forward, to initialize it using
>
> widget = gtk_clist_new_with_titles(cols, "");
>
> didn't work when I had more than 2 columns.

gtk_clist_new_with_titles() requires an array of pointers-to-strings 
that contains the same number of elements as there are columns.  My 
straight C is rusty, but something along the lines of:

gint i = 0;
gint columncount = /* Returned from your SQL query */

gchar** titles = malloc(columncount * sizeof(gchar*));
for(i = 0; i < columncount; i++)
	titles[i] = "";
widget = gtk_clist_new_with_titles(columncount, titles);

... should do the trick.  I don't recall whether GtkCList copies or 
references the strings in the array, so you'll have to experiment to see 
if you can do "free(titles);" immediately afterwards.

HTH,
Timothy M. Shead
tshead k-3d com