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我想在打印作業完成或刪除時收到通知。現在我看到通知機制提供了JOB_STATUS_DELETING，但不能獲得JOB_STATUS_DELETED狀態。無法獲取狀態爲「打印作業」的通知JOB_STATUS_DELETED
我發現了類似的東西Here，但它不能解決我的問題。
我在做下一件事：
HANDLE hChange = FindFirstPrinterChangeNotification(hPrinter,
PRINTER_CHANGE_ALL,
0,
&NotificationOptions);
DWORD dwChange;
HANDLE aHandles[2];
aHandles[0] = hChange;
aHandles[1] = owner->GetStopRequestEvent();
while (hChange != INVALID_HANDLE_VALUE)
{
// sleep until a printer change notification wakes this thread or the
// event becomes set indicating it's time for the thread to end.
WaitForMultipleObjects(2, aHandles, FALSE, INFINITE);
if (WaitForSingleObject(hChange, 0U) == WAIT_OBJECT_0)
{
FindNextPrinterChangeNotification(hChange, &dwChange, &NotificationOptions, (LPVOID *) &pNotification);
if (pNotification != NULL)
{
// if a notification overflow occurred,
if (pNotification->Flags & PRINTER_NOTIFY_INFO_DISCARDED)
{
DWORD dwOldFlags = NotificationOptions.Flags;
// we must refresh to continue
NotificationOptions.Flags = PRINTER_NOTIFY_OPTIONS_REFRESH;
FreePrinterNotifyInfo(pNotification);
FindNextPrinterChangeNotification(hChange, &dwChange, &NotificationOptions, (LPVOID *) &pNotification);
NotificationOptions.Flags = dwOldFlags;
}
// iterate through each notification
for (DWORD x = 0; x < pNotification->Count; x++)
{
PRINTER_NOTIFY_INFO_DATA data = pNotification->aData[x];
if (data.Type == JOB_NOTIFY_TYPE)
{
if (data.Field == JOB_NOTIFY_FIELD_STATUS)
{
if (data.NotifyData.adwData[0] & (JOB_STATUS_DELETED | JOB_STATUS_DELETING | JOB_STATUS_PRINTED))
{
owner->SendJobsData(data.NotifyData.adwData[0]);
}
......
當我刪除任務，JOB_NOTIFY_FIELD_STATUS僅傳遞刪除，並且沒有任何進一步的狀態通知，但我真的需要被刪除狀態。我究竟做錯了什麼？
輪詢方法這裏的全碼： 空隙輪詢（JobTracker的*所有者，CServiceBase *服務） { HANDLE hPrinter = NULL; HANDLE hNotification; （！OpenPrinter（owner - > GetPrinterName（），& hPrinter，NULL）） return;
PPRINTER_NOTIFY_INFO pNotification = NULL;
WORD JobFields[] =
{
JOB_NOTIFY_FIELD_PRINTER_NAME,
JOB_NOTIFY_FIELD_MACHINE_NAME,
JOB_NOTIFY_FIELD_PORT_NAME,
JOB_NOTIFY_FIELD_USER_NAME,
JOB_NOTIFY_FIELD_NOTIFY_NAME,
JOB_NOTIFY_FIELD_DATATYPE,
JOB_NOTIFY_FIELD_PRINT_PROCESSOR,
JOB_NOTIFY_FIELD_PARAMETERS,
JOB_NOTIFY_FIELD_DRIVER_NAME,
JOB_NOTIFY_FIELD_DEVMODE,
JOB_NOTIFY_FIELD_STATUS,
JOB_NOTIFY_FIELD_STATUS_STRING,
JOB_NOTIFY_FIELD_DOCUMENT,
JOB_NOTIFY_FIELD_PRIORITY,
JOB_NOTIFY_FIELD_POSITION,
JOB_NOTIFY_FIELD_SUBMITTED,
JOB_NOTIFY_FIELD_START_TIME,
JOB_NOTIFY_FIELD_UNTIL_TIME,
JOB_NOTIFY_FIELD_TIME,
JOB_NOTIFY_FIELD_TOTAL_PAGES,
JOB_NOTIFY_FIELD_PAGES_PRINTED,
JOB_NOTIFY_FIELD_TOTAL_BYTES,
JOB_NOTIFY_FIELD_BYTES_PRINTED
};
PRINTER_NOTIFY_OPTIONS_TYPE Notifications[1] =
{
{
JOB_NOTIFY_TYPE,
0,
0,
0,
sizeof(JobFields)/sizeof(JobFields[0]),
JobFields
},
};
PRINTER_NOTIFY_OPTIONS NotificationOptions =
{
2,
PRINTER_NOTIFY_OPTIONS_REFRESH,
sizeof(Notifications)/sizeof(Notifications[0]),
Notifications
};
// get a handle to a printer change notification object.
HANDLE hChange = FindFirstPrinterChangeNotification(hPrinter,
PRINTER_CHANGE_ALL,
0,
&NotificationOptions);
DWORD dwChange;
HANDLE aHandles[2];
aHandles[0] = hChange;
aHandles[1] = owner->GetStopRequestEvent();
while (hChange != INVALID_HANDLE_VALUE)
{
// sleep until a printer change notification wakes this thread or the
// event becomes set indicating it's time for the thread to end.
WaitForMultipleObjects(2, aHandles, FALSE, INFINITE);
if (WaitForSingleObject(hChange, 0U) == WAIT_OBJECT_0)
{
FindNextPrinterChangeNotification(hChange, &dwChange, &NotificationOptions, (LPVOID *) &pNotification);
if (pNotification != NULL)
{
// if a notification overflow occurred,
if (pNotification->Flags & PRINTER_NOTIFY_INFO_DISCARDED)
{
DWORD dwOldFlags = NotificationOptions.Flags;
// we must refresh to continue
NotificationOptions.Flags = PRINTER_NOTIFY_OPTIONS_REFRESH;
FreePrinterNotifyInfo(pNotification);
FindNextPrinterChangeNotification(hChange, &dwChange, &NotificationOptions, (LPVOID *) &pNotification);
NotificationOptions.Flags = dwOldFlags;
}
// iterate through each notification
for (DWORD x = 0; x < pNotification->Count; x++)
{
PRINTER_NOTIFY_INFO_DATA data = pNotification->aData[x];
if (data.Type == JOB_NOTIFY_TYPE)
{
if (data.Field == JOB_NOTIFY_FIELD_STATUS)
{
if (data.NotifyData.adwData[0] & (JOB_STATUS_DELETED | JOB_STATUS_DELETING | JOB_STATUS_PRINTED))
{
owner->SendJobsData(data.NotifyData.adwData[0]);
}
}
if (data.Field == JOB_NOTIFY_FIELD_STATUS_STRING)
{
int a = 0;
}
}
else if (data.Type == PRINTER_NOTIFY_TYPE)
{
if (data.Field == PRINTER_NOTIFY_FIELD_STATUS)
{
int a = 0;
}
if (data.Field == PRINTER_NOTIFY_FIELD_STATUS_STRING)
{
int a = 0;
}
}
}
}
FreePrinterNotifyInfo(pNotification);
pNotification = NULL;
}
else if (WaitForSingleObject(owner->GetStopRequestEvent(), 0U) == WAIT_OBJECT_0)
{
FindClosePrinterChangeNotification(hChange);
hChange = INVALID_HANDLE_VALUE;
}
}
}
看起來好像你做錯了什麼。你的問題是爲什麼你永遠不會收到「JOB_STATUS_DELETING」事件？ – 2014-10-20 04:57:01
@CareyGregory不，我需要JOB_STATUS_DELETED通知 – 2014-10-20 08:43:07
實際上，它們是一回事。我不認爲你會看到DELETED狀態，因爲當作業完全刪除時，由於作業不再存在，「GetJob」將失敗。 – 2014-10-20 14:23:57