DOCUMENT:Q202480 20-MAY-2002 [vbwin]
TITLE :HOW TO: Determine Printer Status and Print Job Status from VB
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER::4.0,5.0,6.0
OPER/SYS:
KEYWORDS:kbAPI kbPrinting kbSpooler KbVBA kbVBp kbVBp400 kbVBp500 kbVBp600 kbGrpDSVB kbDSupport
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The information in this article applies to:
- Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0
- Microsoft Visual Basic Professional Edition for Windows, versions 5.0, 6.0
- Microsoft Visual Basic Standard Edition, 32-bit, for Windows, version 4.0
- Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows, version 4.0
- Microsoft Visual Basic Professional Edition, 32-bit, for Windows, version 4.0
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IN THIS TASK
------------
- SUMMARY
- Description of the Technique
- Step-by-Step Sample
- Troubleshooting
- REFERENCES
SUMMARY
=======
This article describes how to use Windows application programming interface
(API) functions in Visual Basic to determine the printer status or the print job
status programmatically. Although an application does not typically have to
check the status of a printer before printing, it may be useful to determine the
status of a printer or print job programmatically.
Description of the Technique
----------------------------
The term "printer" can refer to a hardware device, a queue, a driver, or even a
port. In this article, the term "printer" is defined as a local print queue. The
code sample in this article returns the statuses that the operating system
reports. This is the same status that the spooler reports, which you can check
by watching the local print queue.
For example, to view the queue on a computer that is running Microsoft Windows
98, click Start, point to Settings, click Printers, and then double-click the
icon for the printer whose queue you want to view.
NOTE: You cannot communicate directly with the physical printer. You should not
have to do this because the operating system must arbitrate access to the
hardware.
The sample code in this article examines the local print queue, which obtains
information from the port monitor, which in turn communicates with the physical
device. For a more detailed description of how this works, see the articles that
are listed in the "References" section of this article.
This sample reports the status from the printer and from the jobs, but note that
the job status information is generally more reliable for applications. Ideally,
you should examine the jobs and the printer statuses separately, and the code
should infer the "meta" status of the queue. However, for most uses, your code
can rely on the job statuses. Also, this example loops through the jobs and
checks and reports the status of each job. This is because your job may follow
another job that is reporting a problem, such as being out of paper or getting
jammed.
NOTE: The system only checks the status when the system has a job to spool.
Otherwise, the queue is considered "ready" because the queue can accept jobs,
even if the hardware is in an error state. For example, if the last job that was
printed used the last piece of paper, the operating system does not know this
until the system tries to print again.
Additionally, although there are many statuses that may be reported, many are not
supported in practice. The printer hardware and the port monitor determine which
statuses to report. For example, if the printer is out of paper and offline, the
status may be reported as "Printing" because that is what the job is trying to
do. Therefore, a queue that displays "Ready" does not guarantee that your print
job will complete successfully.
This code sample examines only the local queue, which should suffice for most
applications. However, connecting to remote printers can become fairly complex.
You can have chained queues, in which the port for the local queue is actually
another queue. You can have printer pooling, in which multiple printers work
from a common super queue. When the architecture becomes more complex, the code
to retrieve a meaningful status also becomes more complex, and the usefulness of
the status is reduced.
On Microsoft Windows 95, Microsoft Windows 98, and Microsoft Windows Millennium
Edition only, you can also examine the PrinterInfo.Attributes field for the bit
PRINTER_ATTRIBUTE_WORK_OFFLINE. This state is something that typically occurs
because of user action (for example, if the user right-clicks a printer icon and
then clicks Work Offline). This state does not occur because of the state change
of a print job, although the operating system can force state if the printer
cannot be connected to despool a job. In that case, the status is typically
reported as USER_INERVENTION_REQUIRED.
Step-by-Step Example
--------------------
1. Create a new Standard EXE project in Visual Basic. By default, Form1 is
created.
2. On the Project menu, click Add Module, and then add the following code:
Option Explicit
Public Declare Function lstrcpy Lib "kernel32" _
Alias "lstrcpyA" _
(ByVal lpString1 As String, _
ByVal lpString2 As String) _
As Long
Public Declare Function OpenPrinter Lib "winspool.drv" _
Alias "OpenPrinterA" _
(ByVal pPrinterName As String, _
phPrinter As Long, _
pDefault As PRINTER_DEFAULTS) _
As Long
Public Declare Function GetPrinter Lib "winspool.drv" Alias "GetPrinterA" _
(ByVal hPrinter As Long, _
ByVal Level As Long, _
pPrinter As Byte, _
ByVal cbBuf As Long, _
pcbNeeded As Long) _
As Long
Public Declare Function ClosePrinter Lib "winspool.drv" _
(ByVal hPrinter As Long) _
As Long
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
(Destination As Any, _
Source As Any, _
ByVal Length As Long)
Public Declare Function EnumJobs Lib "winspool.drv" Alias "EnumJobsA" _
(ByVal hPrinter As Long, _
ByVal FirstJob As Long, _
ByVal NoJobs As Long, _
ByVal Level As Long, _
pJob As Byte, _
ByVal cdBuf As Long, _
pcbNeeded As Long, _
pcReturned As Long) _
As Long
' constants for PRINTER_DEFAULTS structure
Public Const PRINTER_ACCESS_USE = &H8
Public Const PRINTER_ACCESS_ADMINISTER = &H4
' constants for DEVMODE structure
Public Const CCHDEVICENAME = 32
Public Const CCHFORMNAME = 32
Public Type PRINTER_DEFAULTS
pDatatype As String
pDevMode As Long
DesiredAccess As Long
End Type
Public Type DEVMODE
dmDeviceName As String * CCHDEVICENAME
dmSpecVersion As Integer
dmDriverVersion As Integer
dmSize As Integer
dmDriverExtra As Integer
dmFields As Long
dmOrientation As Integer
dmPaperSize As Integer
dmPaperLength As Integer
dmPaperWidth As Integer
dmScale As Integer
dmCopies As Integer
dmDefaultSource As Integer
dmPrintQuality As Integer
dmColor As Integer
dmDuplex As Integer
dmYResolution As Integer
dmTTOption As Integer
dmCollate As Integer
dmFormName As String * CCHFORMNAME
dmLogPixels As Integer
dmBitsPerPel As Long
dmPelsWidth As Long
dmPelsHeight As Long
dmDisplayFlags As Long
dmDisplayFrequency As Long
End Type
Type SYSTEMTIME
wYear As Integer
wMonth As Integer
wDayOfWeek As Integer
wDay As Integer
wHour As Integer
wMinute As Integer
wSecond As Integer
wMilliseconds As Integer
End Type
Type JOB_INFO_2
JobId As Long
pPrinterName As Long
pMachineName As Long
pUserName As Long
pDocument As Long
pNotifyName As Long
pDatatype As Long
pPrintProcessor As Long
pParameters As Long
pDriverName As Long
pDevMode As Long
pStatus As Long
pSecurityDescriptor As Long
Status As Long
Priority As Long
Position As Long
StartTime As Long
UntilTime As Long
TotalPages As Long
Size As Long
Submitted As SYSTEMTIME
time As Long
PagesPrinted As Long
End Type
Type PRINTER_INFO_2
pServerName As Long
pPrinterName As Long
pShareName As Long
pPortName As Long
pDriverName As Long
pComment As Long
pLocation As Long
pDevMode As Long
pSepFile As Long
pPrintProcessor As Long
pDatatype As Long
pParameters As Long
pSecurityDescriptor As Long
Attributes As Long
Priority As Long
DefaultPriority As Long
StartTime As Long
UntilTime As Long
Status As Long
cJobs As Long
AveragePPM As Long
End Type
Public Const ERROR_INSUFFICIENT_BUFFER = 122
Public Const PRINTER_STATUS_BUSY = &H200
Public Const PRINTER_STATUS_DOOR_OPEN = &H400000
Public Const PRINTER_STATUS_ERROR = &H2
Public Const PRINTER_STATUS_INITIALIZING = &H8000
Public Const PRINTER_STATUS_IO_ACTIVE = &H100
Public Const PRINTER_STATUS_MANUAL_FEED = &H20
Public Const PRINTER_STATUS_NO_TONER = &H40000
Public Const PRINTER_STATUS_NOT_AVAILABLE = &H1000
Public Const PRINTER_STATUS_OFFLINE = &H80
Public Const PRINTER_STATUS_OUT_OF_MEMORY = &H200000
Public Const PRINTER_STATUS_OUTPUT_BIN_FULL = &H800
Public Const PRINTER_STATUS_PAGE_PUNT = &H80000
Public Const PRINTER_STATUS_PAPER_JAM = &H8
Public Const PRINTER_STATUS_PAPER_OUT = &H10
Public Const PRINTER_STATUS_PAPER_PROBLEM = &H40
Public Const PRINTER_STATUS_PAUSED = &H1
Public Const PRINTER_STATUS_PENDING_DELETION = &H4
Public Const PRINTER_STATUS_PRINTING = &H400
Public Const PRINTER_STATUS_PROCESSING = &H4000
Public Const PRINTER_STATUS_TONER_LOW = &H20000
Public Const PRINTER_STATUS_USER_INTERVENTION = &H100000
Public Const PRINTER_STATUS_WAITING = &H2000
Public Const PRINTER_STATUS_WARMING_UP = &H10000
Public Const JOB_STATUS_PAUSED = &H1
Public Const JOB_STATUS_ERROR = &H2
Public Const JOB_STATUS_DELETING = &H4
Public Const JOB_STATUS_SPOOLING = &H8
Public Const JOB_STATUS_PRINTING = &H10
Public Const JOB_STATUS_OFFLINE = &H20
Public Const JOB_STATUS_PAPEROUT = &H40
Public Const JOB_STATUS_PRINTED = &H80
Public Const JOB_STATUS_DELETED = &H100
Public Const JOB_STATUS_BLOCKED_DEVQ = &H200
Public Const JOB_STATUS_USER_INTERVENTION = &H400
Public Const JOB_STATUS_RESTART = &H800
Public Function GetString(ByVal PtrStr As Long) As String
Dim StrBuff As String * 256
'Check for zero address
If PtrStr = 0 Then
GetString = " "
Exit Function
End If
'Copy data from PtrStr to buffer.
CopyMemory ByVal StrBuff, ByVal PtrStr, 256
'Strip any trailing nulls from string.
GetString = StripNulls(StrBuff)
End Function
Public Function StripNulls(OriginalStr As String) As String
'Strip any trailing nulls from input string.
If (InStr(OriginalStr, Chr(0)) > 0) Then
OriginalStr = Left(OriginalStr, InStr(OriginalStr, Chr(0)) - 1)
End If
'Return modified string.
StripNulls = OriginalStr
End Function
Public Function PtrCtoVbString(Add As Long) As String
Dim sTemp As String * 512
Dim x As Long
x = lstrcpy(sTemp, Add)
If (InStr(1, sTemp, Chr(0)) = 0) Then
PtrCtoVbString = ""
Else
PtrCtoVbString = Left(sTemp, InStr(1, sTemp, Chr(0)) - 1)
End If
End Function
Public Function CheckPrinterStatus(PI2Status As Long) As String
Dim tempStr As String
If PI2Status = 0 Then ' Return "Ready"
CheckPrinterStatus = "Printer Status = Ready" & vbCrLf
Else
tempStr = "" ' Clear
If (PI2Status And PRINTER_STATUS_BUSY) Then
tempStr = tempStr & "Busy "
End If
If (PI2Status And PRINTER_STATUS_DOOR_OPEN) Then
tempStr = tempStr & "Printer Door Open "
End If
If (PI2Status And PRINTER_STATUS_ERROR) Then
tempStr = tempStr & "Printer Error "
End If
If (PI2Status And PRINTER_STATUS_INITIALIZING) Then
tempStr = tempStr & "Initializing "
End If
If (PI2Status And PRINTER_STATUS_IO_ACTIVE) Then
tempStr = tempStr & "I/O Active "
End If
If (PI2Status And PRINTER_STATUS_MANUAL_FEED) Then
tempStr = tempStr & "Manual Feed "
End If
If (PI2Status And PRINTER_STATUS_NO_TONER) Then
tempStr = tempStr & "No Toner "
End If
If (PI2Status And PRINTER_STATUS_NOT_AVAILABLE) Then
tempStr = tempStr & "Not Available "
End If
If (PI2Status And PRINTER_STATUS_OFFLINE) Then
tempStr = tempStr & "Off Line "
End If
If (PI2Status And PRINTER_STATUS_OUT_OF_MEMORY) Then
tempStr = tempStr & "Out of Memory "
End If
If (PI2Status And PRINTER_STATUS_OUTPUT_BIN_FULL) Then
tempStr = tempStr & "Output Bin Full "
End If
If (PI2Status And PRINTER_STATUS_PAGE_PUNT) Then
tempStr = tempStr & "Page Punt "
End If
If (PI2Status And PRINTER_STATUS_PAPER_JAM) Then
tempStr = tempStr & "Paper Jam "
End If
If (PI2Status And PRINTER_STATUS_PAPER_OUT) Then
tempStr = tempStr & "Paper Out "
End If
If (PI2Status And PRINTER_STATUS_OUTPUT_BIN_FULL) Then
tempStr = tempStr & "Output Bin Full "
End If
If (PI2Status And PRINTER_STATUS_PAPER_PROBLEM) Then
tempStr = tempStr & "Page Problem "
End If
If (PI2Status And PRINTER_STATUS_PAUSED) Then
tempStr = tempStr & "Paused "
End If
If (PI2Status And PRINTER_STATUS_PENDING_DELETION) Then
tempStr = tempStr & "Pending Deletion "
End If
If (PI2Status And PRINTER_STATUS_PRINTING) Then
tempStr = tempStr & "Printing "
End If
If (PI2Status And PRINTER_STATUS_PROCESSING) Then
tempStr = tempStr & "Processing "
End If
If (PI2Status And PRINTER_STATUS_TONER_LOW) Then
tempStr = tempStr & "Toner Low "
End If
If (PI2Status And PRINTER_STATUS_USER_INTERVENTION) Then
tempStr = tempStr & "User Intervention "
End If
If (PI2Status And PRINTER_STATUS_WAITING) Then
tempStr = tempStr & "Waiting "
End If
If (PI2Status And PRINTER_STATUS_WARMING_UP) Then
tempStr = tempStr & "Warming Up "
End If
'Did you find a known status?
If Len(tempStr) = 0 Then
tempStr = "Unknown Status of " & PI2Status
End If
'Return the Status
CheckPrinterStatus = "Printer Status = " & tempStr & vbCrLf
End If
End Function
3. Add three CommandButton controls.
4. Add three TextBox controls to Form1, and then configure the TextBox controls
as follows:
a. Set the MultiLine property of each TextBox control to True.
b. Size each TextBox to approximately five inches wide and three inches long.
c. Set the ScrollBars property of each TextBox control to "2 - Vertical".
5. Add a Timer control to Form1.
6. Add the following code to the Form's module:
Option Explicit
Private Sub Command1_Click()
'Enable the timer to begin printer status checks.
Timer1.Enabled = True
'Enable and disable start and stop buttons.
Command1.Enabled = False
Command2.Enabled = True
Command3.Enabled = True
End Sub
Private Sub Command2_Click()
'Disable timer to stop further printer checks.
Timer1.Enabled = False
'Enable and disable start and stop buttons.
Command1.Enabled = True
Command2.Enabled = False
Command3.Enabled = True
End Sub
Private Sub Command3_Click()
'Clear the status info.
Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
End Sub
Private Sub Form_Load()
'Initialize captions for control buttons.
Command1.Caption = "Start"
Command2.Caption = "Stop"
Command3.Caption = "Clear"
'Clear the status info.
Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
Command1.Enabled = True
'Disable stop and clear buttons.
Command2.Enabled = False
Command3.Enabled = False
'Set interval for printer status checking to 1/2 second.
Timer1.Enabled = False
Timer1.Interval = 500
End Sub
Private Sub Timer1_Timer()
Dim PrinterStatus As String
Dim JobStatus As String
Dim ErrorInfo As String
'Clear the status info for new info/status.
Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
'Call sub to perform check.
Text1.Text = CheckPrinter(PrinterStatus, JobStatus)
Text2.Text = PrinterStatus
Text3.Text = JobStatus
End Sub
Public Function CheckPrinter(PrinterStr As String, JobStr As String) As String
Dim hPrinter As Long
Dim ByteBuf As Long
Dim BytesNeeded As Long
Dim PI2 As PRINTER_INFO_2
Dim JI2 As JOB_INFO_2
Dim PrinterInfo() As Byte
Dim JobInfo() As Byte
Dim result As Long
Dim LastError As Long
Dim PrinterName As String
Dim tempStr As String
Dim NumJI2 As Long
Dim pDefaults As PRINTER_DEFAULTS
Dim I As Integer
'Set a default return value if no errors occur.
CheckPrinter = "Printer info retrieved"
'NOTE: You can pick a printer from the Printers Collection
'or use the EnumPrinters() API to select a printer name.
'Use the default printer of Printers collection.
'This is typically, but not always, the system default printer.
PrinterName = Printer.DeviceName
'Set desired access security setting.
pDefaults.DesiredAccess = PRINTER_ACCESS_USE
'Call API to get a handle to the printer.
result = OpenPrinter(PrinterName, hPrinter, pDefaults)
If result = 0 Then
'If an error occurred, display an error and exit sub.
CheckPrinter = "Cannot open printer " & PrinterName & _
", Error: " & Err.LastDllError
Exit Function
End If
'Init BytesNeeded
BytesNeeded = 0
'Clear the error object of any errors.
Err.Clear
'Determine the buffer size that is needed to get printer info.
result = GetPrinter(hPrinter, 2, 0&, 0&, BytesNeeded)
'Check for error calling GetPrinter.
If Err.LastDllError <> ERROR_INSUFFICIENT_BUFFER Then
'Display an error message, close printer, and exit sub.
CheckPrinter = " > GetPrinter Failed on initial call! <"
ClosePrinter hPrinter
Exit Function
End If
'Note that in Charles Petzold's book "Programming Windows 95," he
'states that because of a problem with GetPrinter on Windows 95 only, you
'must allocate a buffer as much as three times larger than the value
'returned by the initial call to GetPrinter. This is not done here.
ReDim PrinterInfo(1 To BytesNeeded)
ByteBuf = BytesNeeded
'Call GetPrinter to get the status.
result = GetPrinter(hPrinter, 2, PrinterInfo(1), ByteBuf, _
BytesNeeded)
'Check for errors.
If result = 0 Then
'Determine the error that occurred.
LastError = Err.LastDllError()
'Display error message, close printer, and exit sub.
CheckPrinter = "Couldn't get Printer Status! Error = " _
& LastError
ClosePrinter hPrinter
Exit Function
End If
'Copy contents of printer status byte array into a
'PRINTER_INFO_2 structure to separate the individual elements.
CopyMemory PI2, PrinterInfo(1), Len(PI2)
'Check if printer is in ready state.
PrinterStr = CheckPrinterStatus(PI2.Status)
'Add printer name, driver, and port to list.
PrinterStr = PrinterStr & "Printer Name = " & _
GetString(PI2.pPrinterName) & vbCrLf
PrinterStr = PrinterStr & "Printer Driver Name = " & _
GetString(PI2.pDriverName) & vbCrLf
PrinterStr = PrinterStr & "Printer Port Name = " & _
GetString(PI2.pPortName) & vbCrLf
'Call API to get size of buffer that is needed.
result = EnumJobs(hPrinter, 0&, &HFFFFFFFF, 2, ByVal 0&, 0&, _
BytesNeeded, NumJI2)
'Check if there are no current jobs, and then display appropriate message.
If BytesNeeded = 0 Then
JobStr = "No Print Jobs!"
Else
'Redim byte array to hold info about print job.
ReDim JobInfo(0 To BytesNeeded)
'Call API to get print job info.
result = EnumJobs(hPrinter, 0&, &HFFFFFFFF, 2, JobInfo(0), _
BytesNeeded, ByteBuf, NumJI2)
'Check for errors.
If result = 0 Then
'Get and display error, close printer, and exit sub.
LastError = Err.LastDllError
CheckPrinter = " > EnumJobs Failed on second call! < Error = " _
& LastError
ClosePrinter hPrinter
Exit Function
End If
'Copy contents of print job info byte array into a
'JOB_INFO_2 structure to separate the individual elements.
For I = 0 To NumJI2 - 1 ' Loop through jobs and walk the buffer
CopyMemory JI2, JobInfo(I * Len(JI2)), Len(JI2)
' List info available on Jobs.
Debug.Print "Job ID" & vbTab & JI2.JobId
Debug.Print "Name Of Printer" & vbTab & _
GetString(JI2.pPrinterName)
Debug.Print "Name Of Machine That Created Job" & vbTab & _
GetString(JI2.pMachineName)
Debug.Print "Print Job Owner's Name" & vbTab & _
GetString(JI2.pUserName)
Debug.Print "Name Of Document" & vbTab & GetString(JI2.pDocument)
Debug.Print "Name Of User To Notify" & vbTab & _
GetString(JI2.pNotifyName)
Debug.Print "Type Of Data" & vbTab & GetString(JI2.pDatatype)
Debug.Print "Print Processor" & vbTab & _
GetString(JI2.pPrintProcessor)
Debug.Print "Print Processor Parameters" & vbTab & _
GetString(JI2.pParameters)
Debug.Print "Print Driver Name" & vbTab & _
GetString(JI2.pDriverName)
Debug.Print "Print Job 'P' Status" & vbTab & _
GetString(JI2.pStatus)
Debug.Print "Print Job Status" & vbTab & JI2.Status
Debug.Print "Print Job Priority" & vbTab & JI2.Priority
Debug.Print "Position in Queue" & vbTab & JI2.Position
Debug.Print "Earliest Time Job Can Be Printed" & vbTab & _
JI2.StartTime
Debug.Print "Latest Time Job Will Be Printed" & vbTab & _
JI2.UntilTime
Debug.Print "Total Pages For Entire Job" & vbTab & JI2.TotalPages
Debug.Print "Size of Job In Bytes" & vbTab & JI2.Size
'Because of a bug in Windows NT 3.51, the time member is not set correctly.
'Therefore, do not use the time member on Windows NT 3.51.
Debug.Print "Elapsed Print Time" & vbTab & JI2.time
Debug.Print "Pages Printed So Far" & vbTab & JI2.PagesPrinted
'Display basic job status info.
JobStr = JobStr & "Job ID = " & JI2.JobId & _
vbCrLf & "Total Pages = " & JI2.TotalPages & vbCrLf
tempStr = "" 'Clear
'Check for a ready state.
If JI2.pStatus = 0& Then ' If pStatus is Null, check Status.
If JI2.Status = 0 Then
tempStr = tempStr & "Ready! " & vbCrLf
Else 'Check for the various print job states.
If (JI2.Status And JOB_STATUS_SPOOLING) Then
tempStr = tempStr & "Spooling "
End If
If (JI2.Status And JOB_STATUS_OFFLINE) Then
tempStr = tempStr & "Off line "
End If
If (JI2.Status And JOB_STATUS_PAUSED) Then
tempStr = tempStr & "Paused "
End If
If (JI2.Status And JOB_STATUS_ERROR) Then
tempStr = tempStr & "Error "
End If
If (JI2.Status And JOB_STATUS_PAPEROUT) Then
tempStr = tempStr & "Paper Out "
End If
If (JI2.Status And JOB_STATUS_PRINTING) Then
tempStr = tempStr & "Printing "
End If
If (JI2.Status And JOB_STATUS_USER_INTERVENTION) Then
tempStr = tempStr & "User Intervention Needed "
End If
If Len(tempStr) = 0 Then
tempStr = "Unknown Status of " & JI2.Status
End If
End If
Else
' Dereference pStatus.
tempStr = PtrCtoVbString(JI2.pStatus)
End If
'Report the Job status.
JobStr = JobStr & tempStr & vbCrLf
Debug.Print JobStr & tempStr
Next I
End If
'Close the printer handle.
ClosePrinter hPrinter
End Function
7. Go to your print queue, and then pause the printer. Note that you may need a
local printer instead of a network printer to pause the print queue.
8. Run the sample project, and then click Start.
9. Perform one or more print operations from another application such as
Notepad. The printer information is displayed in the text boxes. Notice that
job details appear in the Immediate window.
10. If necessary, click Stop on the form to scroll through the text boxes and
the Immediate window to view this printer information.
Troubleshooting
---------------
- Only a specific device driver can obtain real-time, accurate printer status
information. This code obtains the same status that the Windows Spooler
reports.
- The exact status that is reported may vary with different printers and
drivers.
REFERENCES
==========
For additional information about how printer status and print job status are
set, click the article number below to view the article in the Microsoft
Knowledge Base:
Q160129 HOWTO: Get the Status of a Printer and a Print Job
For additional information about how to use the EnumPrinters API function, click
the article number below to view the article in the Microsoft Knowledge Base:
Q166008 ACC: Enumerating Local and Network Printers
For additional information about how to retrieve print job information in
Microsoft Visual C++, click the article numbers below to view the articles in
the Microsoft Knowledge Base:
Q228769 HOWTO: Retrieve Print Job Information
Q158828 HOWTO: How To Call Win32 Spooler Enumeration APIs Properly
Additional query words: printer queue
======================================================================
Keywords : kbAPI kbPrinting kbSpooler KbVBA kbVBp kbVBp400 kbVBp500 kbVBp600 kbGrpDSVB kbDSupport kbHOWTOmaster
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Version : :4.0,5.0,6.0
Issue type : kbhowto
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