Hi all,
i am writing a wrapper to an SQLite database.
If i use :
extern { fn sqlite3_open(filename: *c_char, ppDb : **mut ()) -> c_int; }
i can not use :
let ppDb : **mut () = RawPtr::null();
unsafe { res=sqlite3_open(filename.as_ptr(), ppDb);
because as_ptr() returns an *u8 and c_char is a i8, so i have to use
extern { fn sqlite3_open(filename: *c_uchar, ppDb : **mut ()) -> c_int; }
Now, suppose i use :
extern { fn sqlite3_errmsg(pDb : *mut ()) -> *c_uchar; }
i can not use :
let mut desc=""; { unsafe { desc =
c_str_to_static_slice(sqlite3_errmsg(*ppDb)); } }
because c_str_to_static_slice taks a *c_char (so an i8) as argument, so i
have to use
extern { fn sqlite3_errmsg(pDb : *mut ()) -> *c_char; }
If the second example is quite logical, what about the first one ?
how to convert &str -> *c_char ?
thanks
--
Christophe
http://chris-pe.github.io/Rustic/
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