API questions

[Art]

If I were writing a program to do things, I'd be looking at the source code, though it would be nice if the API stood alone. (I haven't used the API, so I am not familiar with what you're trying to do specifically. I usually just tweak GC and rebuild it to make it do what I want or access the SQL database directly, carefully if I am writing to it.)
On exporting to PDF, I always use a PDF printer driver (in Windows and Linux). I've seen some apps that do export to PDF, but I never do that with my code - it's not worth bloating it (my software apps do create ASCII text files and write to the clipboard). I can also see where you may want to export v. print programmatically (avoid modal printer dialogs, if you need to change the default printer).

      From: David Goodenough <david.goodenough at linkchoose.co.uk>
 To: gnucash-user at gnucash.org 
 Sent: Friday, June 10, 2016 2:05 AM
 Subject: API questions
   
I notice when looking at the API pages that a method is defined as starting
at a given line, and then the code below always starts on the next line, i.e.
missing out the prototype.  For example:-

Definition at line 116 of file print-session.c.

  117 {
  118    return print_settings;
  119 }

Would it not be possible to show line 116 as well?  This seems to be a
consistent problem throughout the docs.

The reason I was looking was to generate customer reports via the API.
I would like to be able to generate a report for each customer who either
has a non-zero balance or where some transaction (invoice or receipt of
payment) happened last month (or since rather since I last ran the program).
I then want to export the report as a PDF.  I have looked my way through
the API docs but could not see how to generate reports, or to check for
the balance or the presence of transactions since a date.

I found docs on how to create invoices, but also need to be able to 
export them as PDFs and could not locate the API for that either.  I notice
in the gnucash XML files that the last direcorty to which invoices ( and I 
guess customer reports ) were exported is stored, is this available from
the API.

What I want to be able to write is a program that will generate reports
for all relevant customers, and then send an email to each customer who
has either an invoice and/or a report containing both.

Any pointers gratefully received.

David
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