Re: Passing string literals to C

[Gary Willoughby via Digitalmars-d-learn]

On Wednesday, 31 December 2014 at 11:19:36 UTC, Laeeth Isharc 
wrote:
Argh - no way to edit.

What's best practice here?
D strings are not null-terminated.
===
cpling.c

char* cpling(char *s)
{
  s[0]='!';
  return s;
}
===
dcaller.d

extern(C) char* cpling(char* s);

void callC()
{
  writefln("%s",fromStringz(cpling("hello\0")));
}

or

void callC()
{
  writefln("%s",fromStringz(cpling(toStringz("hello"))));
}

===

am I missing a better way to do this?

To call a C function you can either use string literals which are 
always null terminated or use std.string.toStringz (when using 
string variables) to add the null and return a char*.

To convert from char* (from a C function return value) to a D 
string use std.conv.to!(string).