Admin plugin, how can I output a different content-type?

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I’ve done this two ways:

1) – a csv export function – detect that special content type handling is required BEFORE wp outputs anything.

add_action ('plugins_loaded',           'amr_meta_handle_csv');

function amr_meta_handle_csv ($csv, $suffix='csv') {
// chcek if there is a csv request on this page BEFORE we do anything else ?
if (( isset ($_POST['csv']) )) {
// do some stuff
      to_csv ($csv, $suffix)
}
}


function to_csv ($csv, $suffix) {
/* create a csv file for download */
    if (!isset($suffix)) $suffix = 'csv';
    $file="userlist-".date('YmdHis').'.'.$suffix;
    header("Content-Description: File Transfer");
    header("Content-type: application/octet-stream");
    header("Content-Disposition: attachment; filename=$file");
    header("Pragma: no-cache");
    header("Expires: 0");
    echo $csv;
    exit(0);   /* Terminate the current script sucessfully */
}

Another way was more feed oriented, but same principle, except wp does the special handling detection (checks for ?feed=ics or ). Put the add_feed code in an init action.

add_feed('ics', 'ical_feed');

function ‘ical_feed’ then does the whole header etc.

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