如何获取不直接打印的打印机列表？

Question

我需要一份不直接打印的打印机列表。获得一份直接打印的清单似乎相当容易。但是如何反其道而行之呢？

    Dim PrintServer As New SysPrint.PrintServer
    Dim arrFlags(0) As SysPrint.EnumeratedPrintQueueTypes
    arrFlags(0) = System.Printing.EnumeratedPrintQueueTypes.DirectPrinting
    Dim QColl As SysPrint.PrintQueueCollection = PrintServer.GetPrintQueues(arrFlags)

PrintServer.GetPrintQueues Method

EnumeratedPrintQueueTypes Enumeration

MSDN 说 EnumeratedPrintQueueTypes 有一个 FlagsAttribute 属性，允许对其成员值进行按位组合。所以我应该能够以某种方式指定 NOT direct。我该怎么做？

我尝试这样做 arrFlags(0) = Not System.Printing.EnumeratedPrintQueueTypes.DirectPrinting 但没有返回任何结果。明显不正确。

那么如何操作标志属性来消除所有打印机直接打印？

Answer 1

这是一种方法，但看起来很不优雅：

    'get full list
    Dim PrintServer As New SysPrint.PrintServer
    Dim QColl As SysPrint.PrintQueueCollection = PrintServer.GetPrintQueues()

    'get those not printing direct 
    Dim Qcoll2 As List(Of SysPrint.PrintQueue) = QColl.Where(Function(x) Not (x.IsDirect)).ToList

    'select name only
    Dim strList As List(Of String) = Qcoll2.Select(Function(x) x.Name).ToList

如何获取不直接打印的打印机列表？

How to get list of printers not printing direct?

vb.net

bitflags