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From: Catonano <catonano@gmail.com>
To: guile-user@gnu.org
Subject: a foreign struct: a shameless request
Date: Fri, 16 Jun 2017 18:04:55 +0200	[thread overview]
Message-ID: <CAJ98PDx2r7=65jci8xLr6z8-zEYE-X+38xrGMA=DrJA90ZqQRA@mail.gmail.com> (raw)

I'd love to see a template of usage of a complex structure from scheme
That is, I'm asking for someone to write that template for me :-/

This is the foreign struct I have to deal with

https://www.gaia-gis.it/gaia-sins/freexl-1.0.1-doxy-doc/html/structFreeXL__CellValue__str.html

Particulary, I don't know how to treat the "union" thing

A different union field gets populated on the basis of the type of the
content of the spreadsheet cell

If the cell contains an integer number, then cell.int_value field gets
populated

If the cell contains a double float number, then the cell.double_value
field gets populated

And so on

This is an excerpt from the example usage:

switch (cell.type
<https://www.gaia-gis.it/gaia-sins/freexl-1.0.1-doxy-doc/html/structFreeXL__CellValue__str.html#af2b1f157e4dc4508b1c4e303429c01d5>
)
{
   case FREEXL_CELL_INT
<https://www.gaia-gis.it/gaia-sins/freexl-1.0.1-doxy-doc/html/freexl_8h.html#a1a2260897b305108f008c924a7e56778>
:
   printf (", %d", cell.value
<https://www.gaia-gis.it/gaia-sins/freexl-1.0.1-doxy-doc/html/structFreeXL__CellValue__str.html#acaf7ae03285c299b05f0e345eff3c6a1>
.int_value
<https://www.gaia-gis.it/gaia-sins/freexl-1.0.1-doxy-doc/html/structFreeXL__CellValue__str.html#a7dcd352478ee217f4a24e7fcff6170bb>
);
   break;
...

How do I use "make-c-struct" and "parse-c-struct" with a structure like
this ?

Thanks in advance


             reply	other threads:[~2017-06-16 16:04 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-16 16:04 Catonano [this message]
2017-06-16 19:02 ` a foreign struct: a shameless request Taylan Ulrich Bayırlı/Kammer
2017-06-18  6:22   ` Catonano
2017-06-18 12:28     ` Amirouche
2017-06-18 14:41       ` Catonano

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