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如何：列舉列印佇列的子集

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管理全公司印表機的資訊技術 (IT) 專業人員面臨的常見情況是產生具有特定特性的印表機清單。 這項功能是由 PrintServer 物件的 GetPrintQueues 方法和 EnumeratedPrintQueueTypes 列舉所提供。

範例

在下列範例中，程式碼會從建立旗標陣列開始，以指定我們想要列出之列印佇列的特性。 在此範例中，我們會尋找在列印伺服器上本機安裝並共用的列印佇列。 EnumeratedPrintQueueTypes 列舉提供其他許多可能性。

程式碼接著會建立 LocalPrintServer 物件，這是衍生自 PrintServer 的類別。 本機列印伺服器是應用程式執行所在的電腦。

最後一個重要步驟是將陣列傳遞至 GetPrintQueues 方法。

最後，結果會呈現給使用者。

// Specify that the list will contain only the print queues that are installed as local and are shared
array<System::Printing::EnumeratedPrintQueueTypes>^ enumerationFlags = {EnumeratedPrintQueueTypes::Local,EnumeratedPrintQueueTypes::Shared};

LocalPrintServer^ printServer = gcnew LocalPrintServer();

//Use the enumerationFlags to filter out unwanted print queues
PrintQueueCollection^ printQueuesOnLocalServer = printServer->GetPrintQueues(enumerationFlags);

Console::WriteLine("These are your shared, local print queues:\n\n");

for each (PrintQueue^ printer in printQueuesOnLocalServer)
{
   Console::WriteLine("\tThe shared printer " + printer->Name + " is located at " + printer->Location + "\n");
}
Console::WriteLine("Press enter to continue.");
Console::ReadLine();

// Specify that the list will contain only the print queues that are installed as local and are shared
EnumeratedPrintQueueTypes[] enumerationFlags = {EnumeratedPrintQueueTypes.Local,
                                                EnumeratedPrintQueueTypes.Shared};

LocalPrintServer printServer = new LocalPrintServer();

//Use the enumerationFlags to filter out unwanted print queues
PrintQueueCollection printQueuesOnLocalServer = printServer.GetPrintQueues(enumerationFlags);

Console.WriteLine("These are your shared, local print queues:\n\n");

foreach (PrintQueue printer in printQueuesOnLocalServer)
{
    Console.WriteLine("\tThe shared printer " + printer.Name + " is located at " + printer.Location + "\n");
}
Console.WriteLine("Press enter to continue.");
Console.ReadLine();

' Specify that the list will contain only the print queues that are installed as local and are shared
Dim enumerationFlags() As EnumeratedPrintQueueTypes = {EnumeratedPrintQueueTypes.Local, EnumeratedPrintQueueTypes.Shared}

Dim printServer As New LocalPrintServer()

'Use the enumerationFlags to filter out unwanted print queues
Dim printQueuesOnLocalServer As PrintQueueCollection = printServer.GetPrintQueues(enumerationFlags)

Console.WriteLine("These are your shared, local print queues:" & vbLf & vbLf)

For Each printer As PrintQueue In printQueuesOnLocalServer
    Console.WriteLine(vbTab & "The shared printer " & printer.Name & " is located at " & printer.Location & vbLf)
Next printer
Console.WriteLine("Press enter to continue.")
Console.ReadLine()

您可以藉由讓逐步執行每個列印佇列的 foreach 迴圈進一步篩選，來擴充此範例。 例如，您可以讓迴圈呼叫每個列印佇列的 GetPrintCapabilities 方法，並測試傳回的值是否有雙工，以篩選出不支援雙面列印的印表機。

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