I want use tgetnum for get terminal size
http://www.mkssoftware.com/docs/man3/curs_termcap.3.asp

extern(C):
int tgetnum(const(char) *capname);

calling a method from main
writeln(tgetnum(toStringz("li")));


I receive an error message
Undefined symbols for architecture x86_64:
  "_tgetnum", referenced from:
      _main in RSConsole.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)


Does anyone know what the problem is?
Maybe there are other methods to get and set sizes of the Mac OS X console?

Try adding -lncurses or -lcurses to the command line. tgetnum is found in the curses library which isn't linked in automatically by default.

On Saturday, 19 April 2014 at 09:59:39 UTC, Adam D. Ruppe wrote:
> Try adding -lncurses or -lcurses to the command line. tgetnum is found in the curses library which isn't linked in automatically by default.


Error: unrecognized switch '-lcurses'
Error: unrecognized switch '-lncurses'

:((

Blargh, I don't know teh ldc switch for it :(

Try adding pragma(lib, "curses"); (or ncurses) to your file with main in it, i think ldc supports that.

On Saturday, 19 April 2014 at 10:39:43 UTC, Adam D. Ruppe wrote:
> Blargh, I don't know teh ldc switch for it :(
>
> Try adding pragma(lib, "curses"); (or ncurses) to your file with main in it, i think ldc supports that.





pragma(lib, "curses");

extern(C):
int tgetnum(const(char) *capname);

hmm segfault error :(
Segmentation fault: 11

What are compiler and platform do you use? Probably you are trying to link with 64-bit library while being on 32-bit OS (or vice versa)
It works fine on my 32-bit Debian with ldc2 and dmd.

I use
ldc2 main.d -L-lcurses
or
dmd main.d -L-lcurses

and following source code:

import std.stdio;

extern(C) int tgetnum(const(char) *id);

int main()
{
    writeln(tgetnum("li"));
    return 0;
}

Note that you don't need to apply toStringz to string literals since they implicitly cast to const char*.

On 4/19/2014 9:06 PM, FreeSlave wrote:
>
> Note that you don't need to apply toStringz to string literals since
> they implicitly cast to const char*.

And, more importantly, are nul terminated.

On Saturday, 19 April 2014 at 12:06:58 UTC, FreeSlave wrote:
> I use
> ldc2 main.d -L-lcurses
> or
> dmd main.d -L-lcurses
>
> and following source code:
>
> import std.stdio;
>
> extern(C) int tgetnum(const(char) *id);
>
> int main()
> {
>     writeln(tgetnum("li"));
>     return 0;
> }
>
> Note that you don't need to apply toStringz to string literals since they implicitly cast to const char*.

It's work) Thanks.