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PrintUtils.bbj
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PrintUtils.bbj
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use java.lang.Process
use java.io.BufferedReader
use java.io.InputStreamReader
REM /**
REM * PrintUtils.bbj
REM * @author BASIS
REM */
class public PrintUtils
field private static BBjString lookupPrintersNamespaceKey$ = "_______lookupPrinters_______"
field private static BBjString lookupDefaultPrinterNamespaceKey$ = "_______lookupDefaultPrinter_______"
REM /**
REM * lookupPrinters: alternate version of BBjAPI().lookupPrinters
REM * purpose: workaround for this problem:
REM * These sources describe the problem from Java's point of view
REM * https://bugs.openjdk.java.net/browse/JDK-8182683
REM * https://bugs.openjdk.java.net/browse/JDK-8180347
REM * basically the JVM sporadically crashes on some Windows systems
REM * when looking up printers
REM * so this method tries to use powershell to lookup the printers
REM * instead of the Java internal method
REM * falling back to the BBj version
REM */
method public static BBjVector lookupPrinters(BBjInt f_client%)
if f_client% <> 0 then
f_client% = 1
endif
rem we're caching the result in the GroupNamespace
rem to further reduce the risk of JVM crashes
ns$ = #lookupPrintersNamespaceKey$ + str(f_client%)
ns! = BBjAPI().getGroupNamespace()
rem returning the cached value if present
methodret ns!.getValue(ns$,err=*next)
if (info(3,6)<>"5") then
rem not BUI
cmd$ = "powershell -Command ""get-WmiObject -class Win32_printer | ft name"""
if f_client% = 0 then
os$ = System.getProperty("os.name")
if pos("Windows"=os$)>0 then
printers! = #getServerPrinterNames(cmd$)
fi
else
os$ = str(System@.getProperty("os.name"))
if pos("Windows"=os$)>0 then
printers! = #getClientPrinterNames(cmd$)
fi
fi
fi
if printers! = null() OR printers!.isEmpty() then
rem fall back
printers! = BBjAPI().lookupPrinters(null(), f_client%)
fi
rem setting the value to cache
ns!.setValue(ns$,printers!)
methodret printers!
methodend
rem /**
rem * Returns a BBjString with the client's or server's default printer name.
rem *
rem * @param f_client% The BBjInt value specifying whether to return the
rem * client's or server's default printer name
rem *
rem * @return a BBjString with the client's or server's default printer name.
rem */
method public static BBjString lookupDefaultPrinter(BBjInt f_client%)
if f_client% <> 0 then
f_client% = 1
endif
rem we're caching the result in the GroupNamespace
rem to further reduce the risk of JVM crashes
ns$ = #lookupDefaultPrinterNamespaceKey$ + str(f_client%)
ns! = BBjAPI().getGroupNamespace()
rem returning the cached value if present
methodret ns!.getValue(ns$,err=*next)
if (info(3,6)<>"5") then
rem not BUI
cmd$ = "powershell -Command ""Get-WmiObject -Query 'SELECT * FROM Win32_Printer WHERE Default=true' | ft name"""
if f_client% = 0 then
os$ = System.getProperty("os.name")
if pos("Windows"=os$)>0 then
printers! = #getServerPrinterNames(cmd$)
fi
else
os$ = str(System@.getProperty("os.name"))
if pos("Windows"=os$)>0 then
printers! = #getClientPrinterNames(cmd$)
fi
fi
fi
if printers! = null() OR printers!.isEmpty() then
methodret ""
fi
rem setting the value to cache
ns!.setValue(ns$,printers!.get(0))
methodret printers!.get(0)
methodend
rem /**
rem * Executes the given command on the server and returns a BBjVector
rem * with the printer names returned by it.
rem *
rem * @param command$ The command to execute
rem * @return a BBjVector with the printer names
rem */
method private static BBjVector getServerPrinterNames(BBjString command$)
declare Process process!
process! = Runtime.getRuntime().exec(command$)
declare BufferedReader reader!
reader! = new BufferedReader(new InputStreamReader(process!.getInputStream()))
declare BBjVector printers!
printers! = new BBjVector()
while 1
line! = reader!.readLine()
if line! = null() then
break
fi
entry$ = cvs(str(line!),3)
if entry$ = "name" or entry$ = "----" or entry$="" then
continue
fi
printers!.addItem(entry$)
wend
rem closing the stream
reader!.close()
methodret printers!
methodend
rem /**
rem * Executes the given command on the client and returns a BBjVector
rem * with the printer names returned by it.
rem *
rem * @param command$ The command to execute
rem * @return a BBjVector with the printer names
rem */
method private static BBjVector getClientPrinterNames(BBjString command$)
declare Process@ process!
process! = Runtime@.getRuntime().exec(command$)
declare BufferedReader@ reader!
reader! = new BufferedReader@(new InputStreamReader@(process!.getInputStream()))
declare BBjVector printers!
printers! = new BBjVector()
while 1
line! = reader!.readLine()
if line! = null() then
break
fi
entry$ = cvs(str(line!),3)
if entry$ = "name" or entry$ = "----" or entry$="" then
continue
fi
printers!.addItem(entry$)
wend
rem closing the stream
reader!.close()
methodret printers!
methodend
rem /**
rem * Clears the cache by removing the client or server printer names from the BBjGroupNamespace.
rem *
rem * @param f_client% The BBjInt value specifying whether to clear the client or server printer names.
rem */
method public static void clearCache(BBjInt f_client%)
if f_client% <> 0 then
f_client% = 1
endif
declare BBjNamespace namespace!
namespace! = BBjAPI().getGroupNamespace()
namepsace!.removeValue(#lookupPrintersNamespaceKey$ + str(f_client%), err=*next)
namepsace!.removeValue(#lookupDefaultPrinterNamespaceKey$ + str(f_client%), err=*next)
methodend
classend