Generate vCard from Custom fields

Hi Long,
Sorry I never reply to this post!

I'm actually trying agin to create the vCard with the little knowledge I got, but still not working. Right now I'm just trying to save the info in the vCard, but no file is created when saving posts. What am I missing?

Here is the code:

function otc_create_vcard( $post_id ) {

    /*
     * Get basic metabox values
     */
    $post_type = get_post_type( $post_id );
    $featured_image = wp_get_attachment_url(get_post_thumbnail_id($vpost->ID));
    $otc_meta_name = rwmb_meta( 'ccard_main_contact', '', $post_id );
    $otc_meta_business_name = rwmb_meta('ccard_business_name', '', $post_id );
    $otc_meta_job_title = rwmb_meta('ccard_job_title', '', $post_id );
    $otc_meta_business_email = rwmb_meta('ccard_business_email', '', $post_id );
    $otc_meta_cell_phone = rwmb_meta( 'ccard_cellular_phone_number', '', $post_id );
    $otc_meta_office_phone = rwmb_meta( 'ccard_business_phone_number', '', $post_id );
    $otc_meta_website = rwmb_meta( 'ccard_website', '', $post_id );
    
    $otc_meta_address_street = rwmb_meta('ccard_business_address_street', '', $post_id );
    $otc_meta_address_city = rwmb_meta( 'ccard_business_address_city', '', $post_id );
    $otc_meta_address_state = rwmb_meta( 'ccard_business_address_state', '', $post_id );
    $otc_meta_address_zipcode = rwmb_meta( 'ccard_business_address_zip-code', '', $post_id );
    $otc_meta_address_country = rwmb_meta( 'ccard_business_address_country', '', $post_id);
    
    $otc_page_url = get_permalink();

    // only update the user custom post type on save
    //if ( "card" != $post_type ) return;

    $vpost = get_post($post->ID);
    $filename = strtolower(str_replace(" ","-",$vpost->post_title)).".vcf";
    ('Content-type: text/x-vcard; charset=utf-8');
    header("Content-Disposition: attachment; filename=".$filename);
    $data=null;
    $data.="BEGIN:VCARD\n";
    $data.="VERSION:3.0\n";
    $data.="FN:".$vpost->post_title."\n"; // get post title
    $data.="ORG: ".$otc_meta_business_name."\n";
    $data.="TITLE: ".$otc_meta_job_title."\n";
    $data.="EMAIL;TYPE=work: ".$otc_meta_business_email."\n";
    $data.="TEL;type=CELL;type=VOICE;: ".$otc_meta_cell_phone."\n"; 
    $data.="TEL;type=Office;type=VOICE;: ".$otc_meta_office_phone."\n"; 
    $data.="ADR;Location;PREF: ".$otc_meta_address_street.";".$otc_meta_address_city.";".$otc_meta_address_state.";".$otc_meta_address_zipcode.";".$otc_meta_address_country."/n";
    $data.="PHOTO;ENCODING=b;TYPE=JPEG:".$featured_image."/n";
    $data.="END:VCARD";
    $filePath = get_template_directory()."/vcard/".$filename; // you can specify path here where you want to store file.
    $file = fopen($filePath,"w");
    fwrite($file,$data);
    fclose($file);
}
add_action( 'save_post', 'otc_create_vcard' );