warlord at MIT.EDU
Thu Dec 25 22:40:59 CST 2003
Lionel Elie Mamane <lionel at mamane.lu> writes:
> 1) I'm starting to wonder why I shouldn't take a book* argument,
> too. After all, even gncInvoiceCreate takes one.
> If I don't have to take a book* argument, what do I put in the inst
> field of the new invoice?
Use the same book* from the original invoice.
> 2) What does this do?
> gnc_engine_gen_event (&invoice->inst.entity, GNC_EVENT_CREATE);
> (No, I'm not expecting "generate the event 'A new entity is
> created'" as an answer, but rather what happens when this event is
I don't understand -- this is exactly what this function does. It
generates an engine event that an invoice has been created. That's
all this function does.
> In particular, I'm trying to understand if I should first generate
> the event and then post, or first post and then generate the
You should not need to generate any events on your own. At least I
cannot see any reason why you would need to do so. Just use the
existing APIs and all the events would be fine.
> 3) I have to call gncInvoicePostToAccount in the process. But it takes
> non-const pointers for posted_date and due_date. Does it *change*
> them in some cases? Will it be confused if they are equal?
It takes non-const because some of the other APIs are broken and take
non-const pointers. No, it does not change them, ever. No, it will
not be confused if they are equal, but I see no reason why they should
be equal in the general case. However, the dates are just arbitrary
-- the due date is used to detect when an invoice is, well, due.. And
the post date is for when it's posted (e.g. the 'post date' of the
> 4) The GUI callback for the "post" button calls gncInvoiceBeginEdit
> before gncInvoicePostToAccount. Should I do that too, or am I off
> the hook because it is an invoice I'm busy creating (linked with
> question 2, I guess)?
You should call gncInvoiceBeginEdit() at the beginning of your
function and CommitEdit() at the end of your function. It is
perfectly safe to nest Begin/Commit calls -- but you must be sure to
actually call CommitEdit for every call to BeginEdit. Take a look at
all the other setter functions, or the GUI functions.
> Thanks for your help,
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
warlord at MIT.EDU PGP key available
More information about the gnucash-devel