VB.NET PrintQueue.AddJob方法代碼示例

Friend Class Program
    <System.MTAThreadAttribute()>
    Shared Sub Main(ByVal args() As String) ' Added for clarity, but this line is redundant because MTA is the default.
        ' Create the secondary thread and pass the printing method for 
        ' the constructor's ThreadStart delegate parameter. The BatchXPSPrinter
        ' class is defined below.
        Dim printingThread As New Thread(AddressOf BatchXPSPrinter.PrintXPS)

        ' Set the thread that will use PrintQueue.AddJob to single threading.
        printingThread.SetApartmentState(ApartmentState.STA)

        ' Start the printing thread. The method passed to the Thread 
        ' constructor will execute.
        printingThread.Start()

    End Sub

End Class

Public Class BatchXPSPrinter
    Public Shared Sub PrintXPS()
        ' Create print server and print queue.
        Dim localPrintServer As New LocalPrintServer()
        Dim defaultPrintQueue As PrintQueue = LocalPrintServer.GetDefaultPrintQueue()

        ' Prompt user to identify the directory, and then create the directory object.
        Console.Write("Enter the directory containing the XPS files: ")
        Dim directoryPath As String = Console.ReadLine()
        Dim dir As New DirectoryInfo(directoryPath)

        ' If the user mistyped, end the thread and return to the Main thread.
        If Not dir.Exists Then
            Console.WriteLine("There is no such directory.")
        Else
            ' If there are no XPS files in the directory, end the thread 
            ' and return to the Main thread.
            If dir.GetFiles("*.xps").Length = 0 Then
                Console.WriteLine("There are no XPS files in the directory.")
            Else
                Console.WriteLine(vbLf & "Jobs will now be added to the print queue.")
                Console.WriteLine("If the queue is not paused and the printer is working, jobs will begin printing.")

                ' Batch process all XPS files in the directory.
                For Each f As FileInfo In dir.GetFiles("*.xps")
                    Dim nextFile As String = directoryPath & "\" & f.Name
                    Console.WriteLine("Adding {0} to queue.", nextFile)

                    Try
                        ' Print the Xps file while providing XPS validation and progress notifications.
                        Dim xpsPrintJob As PrintSystemJobInfo = defaultPrintQueue.AddJob(f.Name, nextFile, False)
                    Catch e As PrintJobException
                        Console.WriteLine(vbLf & vbTab & "{0} could not be added to the print queue.", f.Name)
                        If e.InnerException.Message = "File contains corrupted data." Then
                            Console.WriteLine(vbTab & "It is not a valid XPS file. Use the isXPS Conformance Tool to debug it.")
                        End If
                        Console.WriteLine(vbTab & "Continuing with next XPS file." & vbLf)
                    End Try

                Next f ' end for each XPS file

            End If 'end if there are no XPS files in the directory

        End If 'end if the directory does not exist

        Console.WriteLine("Press Enter to end program.")
        Console.ReadLine()

    End Sub

End Class

' Create the printer server and print queue objects
Dim localPrintServer As New LocalPrintServer()
Dim defaultPrintQueue As PrintQueue = LocalPrintServer.GetDefaultPrintQueue()

' Call AddJob
Dim myPrintJob As PrintSystemJobInfo = defaultPrintQueue.AddJob()

' Write a Byte buffer to the JobStream and close the stream
Dim myStream As Stream = myPrintJob.JobStream
Dim myByteBuffer() As Byte = UnicodeEncoding.Unicode.GetBytes("This is a test string for the print job stream.")
myStream.Write(myByteBuffer, 0, myByteBuffer.Length)
myStream.Close()

' Create the printer server and print queue objects
Dim localPrintServer2 As New LocalPrintServer()
Dim defaultPrintQueue2 As PrintQueue = LocalPrintServer.GetDefaultPrintQueue()

' Call AddJob 
Dim anotherPrintJob As PrintSystemJobInfo = defaultPrintQueue2.AddJob("MyJob")

' Read a file into a StreamReader
Dim myStreamReader As New StreamReader("C:\test.txt")

' Write a Byte buffer to the JobStream and close the stream
Dim anotherStream As Stream = anotherPrintJob.JobStream
Dim anotherByteBuffer() As Byte = UnicodeEncoding.Unicode.GetBytes(myStreamReader.ReadToEnd())
anotherStream.Write(anotherByteBuffer, 0, anotherByteBuffer.Length)
anotherStream.Close()