VMUINT32 job_id;
job_id = vm_wlan_scan(scan_cb, NULL);

void scan_cb(VMUINT32 job_id, void* user_data, vm_wlan_scan_result_t* scan_res)
{
    if (VM_WLAN_SCAN_SUCCESS == scan_res->result)
    {
        // Scan successfully. Information of APs scaned is in scan_res.
    }
}