MLActivate()

#include "mathlink.h"

/* create a link and establish the connection */

int main(int argc, char **argv)
{
    MLENV env;
    MLINK link;
    int error;

    env = MLInitialize((char *)0);
    if(env == (MLENV)0)
      { /* unable to initialize the MathLink environment */ }

    /* let MLOpenArgcArgv process the command line */
    link = MLOpenArgcArgv(env, argc, argv, &error);
    if(link == (MLINK)0 || error != MLEOK)
      { /* unable to create the link */ }

    /* MLActivate will establish the connection */
    if(!MLActivate(link))
      { /* unable to establish communication */ }

    /* ... */

    MLClose(link);
    MLDeinitialize(env);

    return 0;
}