QOF iteration and callbacks

[Derek Atkins]

Neil Williams <linux at codehelp.co.uk> writes:

> On Friday 18 June 2004 3:08, Linas Vepstas wrote:
>> On Thu, Jun 17, 2004 at 10:46:33AM -0400, Derek Atkins was heard to remark:
>> > > void gnc_bm_foreach (QofEntity obj, gpointer ud1); doesn't work. Why?
>> >
>> > You need (QofEntity* obj, gpointer ud1).
>>
>> I'm guessing that the * was dropped accidentally, and then Niel
>> had a very hard seeing that it was missing.  
>
> Precisely. I missed it because of my lack of familiarity with callbacks - 
> normally you get a much clearer warning from the compiler when you make a 
> typo like that.

Not when you cast it.   The cast hides the compiler warnings.

> However, that wasn't all that was missing. I'm testing this in a 'limited' 
> environment where only certain parts of the engine are initialised, 
> specifically, I haven't loaded any modules or any external files. What I 
> didn't realise is that I could not hope to use GNCInvoice in that environment 
> - it was never going to be properly registered with QofObject and would 
> therefore always generate the critical error. I've switched to testing 
> Account and it's coming along OK. No more critical errors from 
> qof_object_foreach. The iteration is solved, now I'm working on building the 
> rule sets.

That would do it.

-derek

-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
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