Description
int
yaz_scan ( int id, string type, string startterm [, array flags])
This function prepares for a Z39.50 Scan Request. Argument
id specifies target ID. Starting term
point for the scan is given by startterm.
The form in which is the starting term is specified is given by
type. Currently type rpn
is supported. The optional flags
specifies additional information to control the behaviour of the
scan request. Three indexes are currently read from the flags:
number (number of terms requested),
position (preferred position of term) and
stepSize (preferred step size).
To actually tranfer the Scan Request to the target and receive the
Scan Response, yaz_wait() must be called. Upon
completion of yaz_wait() call
yaz_error() and
yaz_scan_result() to handle the response.
The syntax of startterm is similar to the
RPN query as described in yaz_search(). The
startterm consists of zero or more @attr-operator
specifications, then followed by exactly one token.
P°φklad 1. PHP function that scans titles function scan_titles($id, $starterm) {
yaz_scan($id,"rpn", "@attr 1=4 " . $starterm);
yaz_wait();
$errno = yaz_errno($id);
if ($errno == 0) {
$ar = yaz_scan_result($id,&$options);
echo 'Scan ok; ';
$ar = yaz_scan_result($id, &$options);
while(list($key,$val)=each($options)) {
echo "$key = $val ";
}
echo '<br><table><tr><td>';
while(list($key,list($k, $term, $tcount))=each($ar)) {
if (empty($k)) continue;
echo "<tr><td>$term</td><td>";
echo $tcount;
echo "</td></tr>";
}
echo '</table>';
} else {
echo "Scan failed. Error: " . yaz_error($id) . "<br>";
}
} |
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