Refresing the Printer Services (in Windows Environment)

Question

Hi,
We implemented a service which shows the list of the printers to the end user. But the list of printers does not get refreshed when we add or remove a printer from the windows machine where this application is running.
Does PrintServices get refreshed when a new printer is added or deleted ?
In JDK 1.6 they implemented some logic to refresh the list of printers based on windows notification event *"FindFirstPrinterChangeNotification"*
But i don't know for what events the java api updates the list of printers?
There is a piece of native code WPrinterJob.cpp which gives the list of events... but that piece of code is commented for some reason...
Does any body have a solution or a workaround for this problem?
Here is the piece of code from WPritnerJob.cpp
JNIEXPORT jlong JNICALL
Java_sun_print_Win32PrintServiceLookup_notifyFirstPrinterChange(JNIEnv *env,
jobject peer,
jstring printer) {
HANDLE hPrinter;
LPTSTR printerName = NULL;
if (printer != NULL) {
printerName = (LPTSTR)JNU_GetStringPlatformChars(env,
printer,
NULL);
JNU_ReleaseStringPlatformChars(env, printer, printerName);
// printerName - "Win NT/2K/XP: If NULL, it indicates the local printer
// server" - MSDN. Win9x : OpenPrinter returns 0.
BOOL ret = OpenPrinter(printerName, &hPrinter, NULL);
if (!ret) {
return (jlong)-1;
// PRINTER_CHANGE_PRINTER = PRINTER_CHANGE_ADD_PRINTER |
// PRINTER_CHANGE_SET_PRINTER |
// PRINTER_CHANGE_DELETE_PRINTER |
// PRINTER_CHANGE_FAILED_CONNECTION_PRINTER
HANDLE chgObj = FindFirstPrinterChangeNotification(hPrinter,
PRINTER_CHANGE_PRINTER,
0,
NULL);
return (chgObj == INVALID_HANDLE_VALUE) ? (jlong)-1 : (jlong)chgObj;
This is in WINDOWS Environment.
One workaround found on the web is to unload the Java class which caches these list of printers and reload it. But this process takes lot of time as it has to get all the list of printers every time.
Thanks,
Vijay.
Edited by: krisprol on Aug 29, 2008 12:05 AM

Answer 1

Re-installed (repair mode) iTunes. That fixed it.