Is there a .NET way to enumerate all available network printers?

问题

Is there a straightforward way to enumerate all visible network printers in .NET? Currently, I\'m showing the PrintDialog to allow the user to select a printer. The problem with that is, local printers are displayed as well (along with XPS Document Writer and the like). If I can enumerate network printers myself, I can show a custom dialog with just those printers.

Thanks!!

回答1:

found this code here

 private void btnGetPrinters_Click(object sender, EventArgs e)
        {
// Use the ObjectQuery to get the list of configured printers
            System.Management.ObjectQuery oquery =
                new System.Management.ObjectQuery("SELECT * FROM Win32_Printer");

            System.Management.ManagementObjectSearcher mosearcher =
                new System.Management.ManagementObjectSearcher(oquery);

            System.Management.ManagementObjectCollection moc = mosearcher.Get();

            foreach (ManagementObject mo in moc)
            {
                System.Management.PropertyDataCollection pdc = mo.Properties;
                foreach (System.Management.PropertyData pd in pdc)
                {
                    if ((bool)mo["Network"])
                    {
                        cmbPrinters.Items.Add(mo[pd.Name]);
                    }
                }
            }

        }

Update:

"This API function can enumerate all network resources, including servers, workstations, printers, shares, remote directories etc."

http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=741&lngWId=10

回答2:

Get the default printer from LocalPrintServer.DefaultPrintQueue
Get the installed printers (from user's perspective) from PrinterSettings.InstalledPrinters
Enumerate through the list:
Any printer beginning with \\ is a network printer - so get the queue with new PrintServer("\\UNCPATH").GetPrintQueue("QueueName")
Any printer not beginning with \\ is a local printer so get it with LocalPrintServer.GetQueue("Name")
You can see which is default by comparing FullName property.

Note: a network printer can be the default printer from LocalPrintServer.DefaultPrintQueue, but not appear in LocalPrintServer.GetPrintQueues()

    // get available printers
    LocalPrintServer printServer = new LocalPrintServer();
    PrintQueue defaultPrintQueue = printServer.DefaultPrintQueue;

    // get all printers installed (from the users perspective)he t
    var printerNames = PrinterSettings.InstalledPrinters;
    var availablePrinters = printerNames.Cast<string>().Select(printerName => 
    {
        var match = Regex.Match(printerName, @"(?<machine>\\\\.*?)\\(?<queue>.*)");
        PrintQueue queue;
        if (match.Success)
        {
            queue = new PrintServer(match.Groups["machine"].Value).GetPrintQueue(match.Groups["queue"].Value);
        }
        else
        {
            queue = printServer.GetPrintQueue(printerName);
        }

        var capabilities = queue.GetPrintCapabilities();
        return new AvailablePrinterInfo()
        {
            Name = printerName,
            Default = queue.FullName == defaultPrintQueue.FullName,
            Duplex = capabilities.DuplexingCapability.Contains(Duplexing.TwoSidedLongEdge),
            Color = capabilities.OutputColorCapability.Contains(OutputColor.Color)
        };
    }).ToArray();

    DefaultPrinter = AvailablePrinters.SingleOrDefault(x => x.Default);

回答3:

using the new System.Printing API

using (var printServer = new PrintServer(string.Format(@"\\{0}", PrinterServerName)))
{
    foreach (var queue in printServer.GetPrintQueues())
    {
        if (!queue.IsShared)
        {
            continue;
        }
        Debug.WriteLine(queue.Name);
     }
 }

回答4:

PrinterSettiings.InstalledPrinters should give you the collection you want

回答5:

In another post(https://stackoverflow.com/a/30758129/6513653) relationed to this one, Scott Chamberlain said "I do not believe there is anything in .NET that can do this, you will need to make a native call". After to try all the possible .NET resource, I think he is right. So, I started to investigate how ADD PRINTER dialog does its search. Using Wireshark, I found out that ADD PRINTER send at least two types of packages to all hosts in local network: two http/xml request to 3911 port and three SNMP requests. The first SNMP request is a get-next 1.3.6.1.2.1.43, which is Printer-MIB. The second one, is a get 1.3.6.1.4.1.2699.1.2.1.2.1.1.3 which is pmPrinterIEEE1284DeviceId of PRINTER-PORT-MONITOR-MIB. This is the most interesting because is where ADD PRINTER takes printer name. The third is a get 1.3.6.1.2.1.1.1.0, which is sysDescr of SNMP MIB-2 System. I do believe that the second SNMP request is enough to find most of network printers in local network, so I did this code. It works for Windows Form Application and it depends on SnmpSharpNet.

Edit: I'm using ARP Ping instead normal Ping to search active hosts in network. Link for an example project: ListNetworks C# Project

回答6:

Note that if you're working over RDP it seems to complicate this because it looks like it just exports everything on the host as a local printer.

Which is then a problem if you're expecting it to work the same way when not on RDP.

来源：https://stackoverflow.com/questions/1018001/is-there-a-net-way-to-enumerate-all-available-network-printers

标签

.net

network-printers