int icvGetCrossLineDirect(CvPoint2D32f p1, CvPoint2D32f p2, float a, float b, float c, CvPoint2D32f* cross) {
    void *fptr;
    int retval;

    fptr = dlsym(_Chcv_handle, "icvGetCrossLineDirect_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return -1;
    }
    dlrunfun(fptr, &retval, icvGetCrossLineDirect, p1, p2, a, b, c, cross);
    return retval;
}
