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setjob (winspool)
 
.
Summary
Pauses, resumes, cancels, or restarts a print job on a specified printer.

C# Signature:

[DllImport("winspool.drv", EntryPoint="SetJobA")]
static extern int SetJobA(IntPtr hPrinter, int JobId,
   int Level, ref byte pJob, int Command_Renamed);

VB Signature:

Declare Function SetJob Lib "winspool.drv" Alias "SetJobA" (hPrinter As IntPtr, JobId As Integer,
   Level As Integer, ByRef pJob As Byte, Command_Renamed As Integer)

User-Defined Types:

Used by sample code: PRINTER_DEFAULTS

    Public Const JOB_CONTROL_PAUSE = &H1
    Public Const JOB_CONTROL_RESUME = &H2
    Public Const JOB_CONTROL_RESTART = &H4
    Public Const JOB_CONTROL_CANCEL = &H3
    Public Const JOB_CONTROL_DELETE = &H5
    Public Const JOB_CONTROL_RETAIN = &H8
    Public Const JOB_CONTROL_RELEASE = &H9

Notes:

None.

Tips & Tricks:

How to cancel a print job:

C#

int pHandle = 0;

PRINTER_DEFAULTS defaults = new PRINTER_DEFAULTS();

byte b = 0;

OpenPrinterA(printerName, ref pHandle, ref defaults);

SetJobA(pHandle, (int)jobID, 0, ref b, JOB_CONTROL_CANCEL);

ClosePrinter(pHandle);

Sample Code:

vb.net

dim Result as long = SetJob(handle, jobid, 0, Nothing, JOB_CONTROL_RESUME)

Alternative Managed API:

The System.Management API allows for lots of printer stuff, but doesn't let you delete a print job in Win2K.

Documentation
SetJob on MSDN

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