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(PECL printer SVN)
printer_list — Liefert ein Array von Zeigern auf den Server zurück
Die Funktion zählt verfügbare Drucker und ihre Eigenschaften auf. level stellt die Menge der erwünschten Informationen ein und muss 1,2,4 oder 5 sein. enumtype muss eine der folgend definierten Konstanten sein:
Beispiel #1 printer_list() Beispiel
<?php
/* Auflistung lokaler und gemeinsam verwendeter Drucker */
var_dump(printer_list(PRINTER_ENUM_LOCAL | PRINTER_ENUM_SHARED));
?>
First, before you do anything, make sure you have a copy of php_printer.dll that is dated later than the first of February, 2007 because there were several parameter handling bugs that were fixed just prior to that date.
Also, beware that the Windows function EnumPrinters often does not return all of the networked printers until someone on the Web server uses the file manager to look at the networked printers, first. I'm presuming this causes the server to contact the domain controller for the browse list, which is then used to enumerate the printers. It does not appear that EnumPrinters will do this on its own, although some of the other values for flags may cause it to do so.
Having said all that, the following code should show you both local and networked printers:
if (function_exists("printer_list"))
{
$PrintCurr = 0;
// Get the local printers.
$PrintDests = printer_list(PRINTER_ENUM_LOCAL);
if (isset($PrintDests))
foreach ($PrintDests as $PrintDest)
$PrinterList[$PrintCurr++] = $PrintDest["NAME"];
// We should be able to enumerate the remote printers too. Let's have a
// shot at it.
//
// Start by looking for the remote printers tree.
$PrintDoms = printer_list(PRINTER_ENUM_NAME); $PrintTree = "";
if (isset($PrintDoms))
foreach ($PrintDoms as $PrintDomain)
{
if (preg_match("/Remote/i", $PrintDomain["NAME"]))
{ $PrintTree = $PrintDomain["NAME"]; break; }
}
// If we found a remote printers tree, we need to enumerate all of the
// domains/workgroups/nodes within the tree and all the printers attached
// to those nodes.
if ($PrintTree != "")
{
// Enumerate all of the domains.
$PrintDoms = printer_list(PRINTER_ENUM_NAME, $PrintTree);
if (isset($PrintDoms))
foreach ($PrintDoms as $PrintDomain)
{
// Enumerate all of the nodes within the domain.
$PrintNodes = printer_list(PRINTER_ENUM_NAME, $PrintDomain["NAME"]);
if (isset($PrintNodes))
foreach ($PrintNodes as $PrintNode)
{
// Enumerate all of the printers within the node.
$PrintDests = printer_list(PRINTER_ENUM_NAME,
$PrintNode["NAME"]);
if (isset($PrintDests))
foreach ($PrintDests as $PrintDest)
$PrinterList[$PrintCurr++] = $PrintDest["NAME"];
}
}
}
}
printer_list was not working for me and the docs are a little sparse. So, I took a look at the code for php_printer.dll (which is at http://viewcvs.php.net/viewvc.cgi/pecl/printer/printer.c, BTW) to figure out what was going on.
Basically, this function is a wrapper for the Windows function EnumPrinters. You can find this function documented in MSDN (which is at http://msdn.microsoft.com). Do a search for EnumPrinters and you should see the function itself as the first hit in the search list.
There is a lot more information about what the parameters to the function mean and the results returned. The printer_list function basically copies the enumtype, name and level parameters directly to the Flags, Name and Level parameters of EnumPrinters, calls the function and then copies all of the fields, in the appropriate data structure returned for the level of information requested, back to the results array.
You can use all the array data, with no crash.
For that you can do this :
$getprt=printer_list(PRINTER_ENUM_LOCAL| PRINTER_ENUM_SHARED );
if ($debugprt){echo "<pre> get prt";
print_r($getprt);
echo "</pre>";
echo count($getprt);
}
$printers = serialize($getprt);
//echo $printers ;
$pp=str_replace _
(";s:11:\"DESCRIPTION\";",";s:4:\"DESC\";",_
str_replace(";s:7:\"COMMENT\";",";s:4:\"COMM\";",$printers));
$printers=unserialize($pp);
if ($debugprt){echo "<pre> pp :";
print_r($printers);
echo "</pre>";
echo count($printers);
}
An that's ok
As saidyjade mentioned below, printer_list crashes Apache when you pound the resulting array too much. I don't know why this happens, somebody should look deeper into the subject...
I have found out, contrary to saidyjade, that also just getting the NAME attribute (and remember, it's case-sensitive! :-) can crash Apache.
Here's what I had:
<?php
foreach (printer_list(PRINTER_ENUM_CONNECTIONS) as $printer)
echo "<option value=\"" . addslashes(strtoupper($printer["NAME"])) . "\">" . strtoupper($printer["NAME"]) . "\n";
?>
This snippet worked alright, whereas
<?php
foreach (printer_list(PRINTER_ENUM_CONNECTIONS) as $printer)
echo "<option value=\"" . addslashes(strtoupper($printer["NAME"])) . "\"" . ((strtoupper($printer["NAME"])) ? " selected" : "") . ">" . strtoupper($printer["NAME"]) . "\n";
?>
crashed Apache everytime the page was loaded.
I played around a bit and found this snippet not crashing:
<?php
foreach (printer_list(PRINTER_ENUM_CONNECTIONS) as $printer)
{
$curprin = strtoupper($printer["NAME"]);
echo "<option value=\"" . addslashes($curprin) . "\"" . (($curprin == $user["drucker"]) ? " selected" : "") . ">$curprin\n";
}
?>
So, in essence you just need to be careful about how much you use the array and if necessary define help variables that you can use as much as you want.
Hope this saves somebody some more minutes...
You can still get the "NAME" of printers through the printer_list as only the array keys "DESCRIPTION" and "COMMENT" crash and not the "NAME" key.
$list_printers = printer_list(PRINTER_ENUM_LOCAL |
PRINTER_ENUM_SHARED);
// get the name of the first returned printer
//(you can add array walk function to get all printer names if you wish.. but I am lazy)
$this_printer = $list_printers[0]["NAME"];
// open a connection to your printer
$my_printer = printer_open($this_printer);
.. blah blah
The output of var_dump (as an example)
var_dump( printer_list(PRINTER_ENUM_LOCAL | PRINTER_ENUM_SHARED) );
array(1) {
[0]=> array(3) {
["NAME"]=> string(14) "Canon BJC-4550"
["DESCRIPTION"]=> string(30) "Canon BJC-4550,Canon BJC-4550,"
["COMMENT"]=> string(0) "This is my funky printer!" } }
As you can see var_dump (under variable functions in the manual) shows and/or retrieves the corrent information but if you try to place into a variable or read the variable it crashes either apache using php4apache.dll or php when you the command line client or cgi.
So as long as you do not get the comment or description it will list your printers.
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