MLGetNext()

#include "mathlink.h"

/* read the next type from the link */

void f(MLINK lp)
{
    int data;

    switch(MLGetNext(lp))
    {
        case MLTKINT:
            if(! MLGetInteger32(lp, &data))
                { /* unable to read the integer from lp */ }
        /* ... */
    }
}