On 2011-07-04 18:59, Steven Schveighoffer wrote:
On Mon, 04 Jul 2011 12:51:48 -0400, Jacob Carlborg <d...@me.com> wrote:
On 2011-07-04 16:31, Jonathan Sternberg wrote:
glut has the function:
void glutInit( int* pargc, char** argv );
In order to use it. Since D has an ABI compatible with C, I should be
able to
write a D file with extern (C) on the glut functions. How would I
wrap this
function to be used with D arrays? Such as:
int main(string[] args)
{
glutInit( /* I don't know what to do here */ );
return 0;
}
Thanks.
It depends on what your needs are. If your not actually using the
arguments then you can pass in 0 and null, or 1 and the name of the
application.
A typical library that uses standardized arguments (i.e. parameters that
always mean the same thing across applications that use that library)
has a parameter pre-processing function such as this which "consume"
their specific arguments from the command line. The idea is, you pass
the command line to those functions, the library processes its specific
arguments, removing them from the command line array, and then all
applications using that library have a way to control the library from
the command line. I think the first one I remember having this is X and
Xt. For example, most X-based applications you can pass
--display=mysystem:0 and it uses that display. The applications simply
use a libX function that processes those args from the command line and
never have to deal with it.
As an alternative, most platforms have an API for getting the
arguments passed to an application.
Mac OS X: extern (C) char*** _NSGetEnviron();
Posix: extern (C) extern char** environ;
Those get the environment variables, not the command line arguments.
Hehe. Wonder what I was thinking. Anyway, the platforms usually do have
an API for that, second try:
Mac OS X:
extern(C) char*** _NSGetArgv();
extern(C) int* _NSGetArgc();
Linux:
I read somewhere you could read from /proc/<pid>/cmdline
Where <pid> is the process id.
Don't know about Windows.
Windows actually does have a command line fetching function. Can't
remember what it is, but if I had to guess I'd say it was GetCommandLine :)
-Steve
Seems to be that one.
--
/Jacob Carlborg
