我希望在完成或删除打印作业时收到通知。现在我看到通知机制提供了JOB_STATUS_DELETING,但是没有JOB_STATUS_DELETED状态。
我找到了类似的Here,但它并没有解决我的问题。
我正在做下一件事:
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]);
}
......
当我删除作业时,JOB_NOTIFY_FIELD_STATUS仅传递DELETING,并且没有任何进一步的状态通知,但我确实需要获得DELETED状态。我做错了什么?
这里的poller方法的完整代码: void Poll(JobTracker *所有者,CServiceBase *服务) { HANDLE hPrinter = NULL; 处理hNotification; if(!OpenPrinter(owner - &gt; GetPrinterName(),&amp; hPrinter,NULL)) 返回;
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;
}
}
}
答案 0 :(得分:2)
如果有人将面临这样的任务,我将离开我解决它的方式。
我注意到,每当作业离队时,PRINTER_CHANGE_JOB_DELETE通知(我的意思是更改FindNextPrinterChangeNotification)。
所以,我只是在线程所有者类(JobTracker)中跟踪任务列表,并且每次在任何PRINTER_CHANGE_JOB上刷新它。但在刷新它之前,我会看一下差异,如果我发现某些工作消失了(通过JobId比较),我会将我的工作向量发送给服务器,并将其发送给服务器。