AddJob Method (String)

PrintQueue.AddJob Method (String)

 

Inserts a new print job, whose content is a Byte array, into the queue.

Namespace:   System.Printing
Assembly:  System.Printing (in System.Printing.dll)

Public Function AddJob (
	jobName As String
) As PrintSystemJobInfo

Parameters

jobName
Type: System.String

The name of the print job.

Return Value

Type: System.Printing.PrintSystemJobInfo

A PrintSystemJobInfo that represents the print job and its status.

Use this method to write device specific information, to a spool file, that is not automatically included by the Microsoft Windows spooler. Of course, you need to know whether the spool file is Enhanced Metafile (EMF) or XML Paper Specification (XPS). If you prefer to work with the Stream API, you can use the PrintQueueStream class instead of this method.

After the AddJob method has been called, you must write a Byte array to the JobStream property of the PrintSystemJobInfo that is returned by AddJob or no print job is created. This array is what prints if the printer is working and is not paused.

System_CAPS_cautionCaution

If the JobStream is not closed with Close before the end of the thread in which AddJob is called, then an InvalidOperationException is thrown when that thread ends because the spooler thread cannot gain control over the Stream object.

Other ways to print in Windows Presentation Foundation (WPF) include the PrintDialog.PrintDocument method, which can be used with or without opening the dialog, and the many Write and WriteAsync methods of the XpsDocumentWriter.

The following example shows how to use AddJob(String) to read a file into a Byte array and send the array to a print queue. This code assumes that there is a file called test.txt in the root of the C: drive. This code only works with printers that can detect and print plain text. Some of them cannot.

' 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()

.NET Framework
Available since 3.0
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