On 27/01/2018 5:11 AM, Joe wrote:
An example test program that I'm using to learn D to C interfacing
(specifically calling the libpq library) has a call to a C function
declared as follows:
void PQprint(FILE *fout, /* output stream */
const PGresult *res,
const PQprintOpt *po);
PQprintOpt is a struct whose first six members are declared as 'pqbool'
which is in turn declared as "typedef char pqbool;" in the distributed
Postgres header file. I've defined an "alias pqbool = char;" in the D
file, which is pretty straightforward.
Use ubyte, not char.
char has a bunch of logic related to Unicode surrounding it which is
clearly not the intent.
The second of the six members has the name "align", which is a D
keyword. So I renamed it "align_" and I presume that won't cause any
problems.
You're good, layout+size just has to match not names of fields.
To deal with the first argument to PQprint, I added "import
core.stdc.stdio : FILE;". The question is how to pass the D "stdout" as
that argument. The D compiler tells me I can't pass it as is (as was
done in C), because in D it's of type "File".
https://dlang.org/phobos/std_stdio.html#.File.getFP
