How to delete all Print Jobs from a print queue

Submitted by Sergey on May 8, 2008 - 08:50

All jobs from a print queue can be deleted with

A specific print job can be deleted by SetJob function.

The following code has been tested under Windows XP. The Windows API version may work under earlier Windows versions.

This is sample code. Add error handling and adjust to your requirements as necessary.

* WMI
lcPrintername = GETPRINTER()
IF NOT EMPTY(lcPrintername)
	IF ClearPrintQueue(lcPrintername) 
		? "The print queue has been successfully cleared"
	ELSE
		? "Error"
	ENDIF
ENDIF
RETURN
*--------------------------------------------------------------------
 
FUNCTION ClearPrintQueue(tcPrinterName)
LOCAL lcPrinterName, loWMI, loPrinters, loPrinter, loErr, loLocator
loLocator 	= CREATEOBJECT('WBEMScripting.SWBEMLocator')
loWMI		= loLocator.ConnectServer() 
loWMI.Security_.ImpersonationLevel = 3  		&& Impersonate
lcPrinterName = STRTRAN(tcPrinterName , "\", "\\")   			
loPrinters =  loWMI.ExecQuery("Select * from Win32_Printer " + ;
				"  WHERE Name = '" + lcPrinterName + "'")
 
llOK = .T.
TRY 
	FOR EACH loPrinter in loPrinters 
	    loPrinter.CancelAllJobs()
	ENDFOR
CATCH TO loErr
	? loErr.Errorno, loErr.Message	
	llOK = .F.
ENDTRY
 
RETURN llOK

The WinApiErrMsg function in the code below is from Retrieving Windows system error message.

* Windows API
 
lcPrintername = GETPRINTER()
IF NOT EMPTY(lcPrintername)
	IF ClearPrintQueue(lcPrintername) 
		? "The print queue has been successfully cleared"
	ELSE
		? "Error"
	ENDIF
ENDIF
RETURN
*--------------------------------------------------------------------
 
FUNCTION ClearPrintQueue(tcPrinterName)
LOCAL lcErrorTxt, lnHandle, lcBuffer, lcPrDef, llOK
 
DECLARE Long GetLastError IN kernel32.dll
 
#DEFINE PRINTER_CONTROL_PURGE 3
#DEFINE PRINTER_ACCESS_ADMINISTER 4
 
lcCrLf = CHR(13) + CHR(10)
lcTab = CHR(9)
lnHandle = 0
 
* Open a Pinter with proper access rights
lcPrDef = REPLICATE(CHR(0),8) + CHR(PRINTER_ACCESS_ADMINISTER) + REPLICATE(CHR(0),3)
llOK = OpenPrinter( tcPrinterName, @lnHandle, lcPrDef) <> 0
IF NOT llOK THEN
	lcErrorTxt = WinApiErrMsg(GetLastError())
	? "Cannot Open Printer " + tcPrinterName + lcCrLf + lcTab + lcErrorTxt
	RETURN llOK
ENDIF
 
* Clear Print Queueu
llOK = SetPrinter( lnHandle, 0, 0, PRINTER_CONTROL_PURGE) <> 0
IF NOT llOK THEN
	lcErrorTxt = WinApiErrMsg(GetLastError())
	*= ClosePrinter( lnHandle )
	? "Error Clearing Print Queue for " + tcPrinterName + lcCrLf + lcTab + lcErrorTxt
	*RETURN llOK
ENDIF
 
= ClosePrinter( lnHandle )
 
RETURN llOK
*---------------------------------------------------------------
 
FUNCTION OpenPrinter(tcPrinterName, thPrinter, tcDefault)
DECLARE Long OpenPrinter IN WinSpool.Drv String pPrinterName, Long@ phPrinter, String pDefault
RETURN 	OpenPrinter(tcPrinterName, @thPrinter, tcDefault)
 
FUNCTION ClosePrinter (thPrinter)
DECLARE Long ClosePrinter IN WinSpool.Drv Long hPrinter
RETURN ClosePrinter(thPrinter)
 
FUNCTION SetPrinter(thPrinter, tnLevel, tnPrinter, tnCommand)
DECLARE Long SetPrinter IN WinSpool.Drv Long hPrinter, Long Level, Long pPrinter, Long Command
RETURN SetPrinter(thPrinter, tnLevel, tnPrinter, tnCommand)
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