HOW TO:设置默认打印机

Author：水如烟  
需要引用System.Management空间再Imports System.Management
使用:

     Private   Sub  Button2_Click( ByVal  sender  As  System.Object,  ByVal  e  As  System.EventArgs)  Handles  Button2.Click
         For   Each  printer  As   String   In  PrinterService.GetPrinterNames( " . " )
            Console.WriteLine(printer)
         Next
     End Sub

     Private   Sub  Button3_Click( ByVal  sender  As  System.Object,  ByVal  e  As  System.EventArgs)  Handles  Button3.Click
        Console.WriteLine(PrinterService.SetDefaultPrinter( " . " ,  " EPSON LQ-1600KIII " ))
     End Sub

 

Public   Class  PrinterService

     Public   Shared   Function  GetPrinterNames( ByVal  computerName  As   String )  As   String ()
         Dim  mResult( - 1 )  As   String

         Dim  gManagementObject  As   New  ManagementObject
        gManagementObject.Scope  =   New  ManagementScope( String .Format( " \\{0}\root\cimv2 " , computerName))
         Dim  gSearcher  As   New  ManagementObjectSearcher( String .Format( " SELECT DeviceID FROM {0} " ,  " Win32_Printer " ))
        gSearcher.Scope  =  gManagementObject.Scope
         Try
             For   Each  mManagementObject  As  ManagementObject  In  gSearcher.Get()
                 ReDim   Preserve  mResult(mResult.Length)
                mResult(mResult.Length  -   1 )  =  mManagementObject.Properties.Item( " DeviceID " ).Value
             Next
         Catch  ex  As  Exception
            Console.WriteLine(ex.Message)
         Finally
            gSearcher.Dispose()
            gManagementObject.Dispose()
         End   Try

         Return  mResult
     End Function

     Public   Shared   Function  SetDefaultPrinter( ByVal  computerName  As   String ,  ByVal  PrinterName  As   String )  As   Boolean
         Dim  mResult  As   Boolean   =   False

         Dim  gManagementObject  As   New  ManagementObject
        gManagementObject.Scope  =   New  ManagementScope( String .Format( " \\{0}\root\cimv2 " , computerName))
         Dim  gSearcher  As   New  ManagementObjectSearcher( String .Format( " SELECT DeviceID FROM {0} " ,  " Win32_Printer " ))
        gSearcher.Scope  =  gManagementObject.Scope
         Try
             For   Each  mManagementObject  As  ManagementObject  In  gSearcher.Get()
                 If  mManagementObject.Properties.Item( " DeviceID " ).Value.ToString.Equals(PrinterName)  Then
                    mManagementObject.InvokeMethod( " SetDefaultPrinter " ,  Nothing )
                     Exit   For
                 End   If
             Next

            mResult  =   True
         Catch  ex  As  Exception
            Console.WriteLine(ex.Message)
         Finally
            gSearcher.Dispose()
            gManagementObject.Dispose()
         End   Try

         Return  mResult
     End Function
End Class