public void PauseNewJobsProc(List<string> printersToPause)
{
if (printersToPause == null || printersToPause.Count == 0)
{
return;
}
// fetch the printer handles
using (var printerHandlesDisposer = InteropHelpers.HandleArrayDisposer.NewReturningBool(Natives.Winspool.ClosePrinter))
{
foreach (var printerName in printersToPause)
{
IntPtr printerHandle;
if (!Natives.Winspool.OpenPrinter(printerName, out printerHandle, IntPtr.Zero) || printerHandle == Natives.Constants.INVALID_HANDLE_VALUE)
{
throw new InteropHelpers.FatalNativeCodeException("failed to open printer " + printerName, "OpenPrinter2");
}
printerHandlesDisposer.Handles.Add(printerHandle);
}
// prepare notification options
using (var fieldsArrayBytes = new InteropHelpers.HGlobalBytes(1 * sizeof(ushort)))
using (var notifyOptionsTypeSerializer = new InteropHelpers.StructSerializer<Natives.Structures.PRINTER_NOTIFY_OPTIONS_TYPE>())
using (var notifyOptionsSerializer = new InteropHelpers.StructSerializer<Natives.Structures.PRINTER_NOTIFY_OPTIONS>())
{
Marshal.WriteInt16(fieldsArrayBytes.Pointer, (short)Natives.Constants.PRINTER_NOTIFY_FIELD_STATUS);
var notifyOptionsType = new Natives.Structures.PRINTER_NOTIFY_OPTIONS_TYPE {
Type = Natives.Constants.JOB_NOTIFY_TYPE,
Reserved0 = 0,
Reserved1 = 0,
Reserved2 = 0,
Count = 1,
Fields = fieldsArrayBytes.Pointer
};
notifyOptionsTypeSerializer.TheStruct = notifyOptionsType;
notifyOptionsTypeSerializer.Serialize();
var notifyOptions = new Natives.Structures.PRINTER_NOTIFY_OPTIONS {
Version = 2,
Flags = 0,
Count = 1,
Types = notifyOptionsTypeSerializer.StructPointer
};
notifyOptionsSerializer.TheStruct = notifyOptions;
notifyOptionsSerializer.Serialize();
// fetch the notifications
using (var notificationDisposer = InteropHelpers.HandleArrayDisposer.NewReturningBool(Natives.Winspool.FindClosePrinterChangeNotification))
{
foreach (var printerHandle in printerHandlesDisposer.Handles)
{
IntPtr notif = Natives.Winspool.FindFirstPrinterChangeNotification(printerHandle, Natives.Constants.PRINTER_CHANGE_ADD_JOB, 0, notifyOptionsSerializer.StructPointer);
if (notif == Natives.Constants.INVALID_HANDLE_VALUE)
{
throw new InteropHelpers.FatalNativeCodeException("failed to subscribe to notifications for a printer", "FindFirstPrinterChangeNotification");
}
notificationDisposer.Handles.Add(notif);
}
// prepare the array for waiting
IntPtr[] waitHandles = new IntPtr[notificationDisposer.Handles.Count + 1];
waitHandles[0] = StopSemaphore;
notificationDisposer.Handles.CopyTo(waitHandles, 1);
// and we wait and we wonder
for (;;)
{
uint waitResult = Natives.Kernel32.WaitForMultipleObjects((uint)waitHandles.Length, waitHandles, false, Natives.Constants.INFINITE);
if (waitResult >= waitHandles.Length)
{
throw new InteropHelpers.FatalNativeCodeException("waiting for printers failed", "WaitForMultipleObjects");
}
else if (waitResult == 0)
{
// stopping semaphore triggered
break;
}
IntPtr triggeredNotif = waitHandles[waitResult];
uint whatChanged;
IntPtr notifyInfoPointer;
if (!Natives.Winspool.FindNextPrinterChangeNotification(triggeredNotif, out whatChanged, notifyOptionsSerializer.StructPointer, out notifyInfoPointer))
{
throw new InteropHelpers.NativeCodeException("fetching change notification failed", "FindNextPrinterChangeNotification");
}
using (var notifyInfoDisposer = InteropHelpers.HandleArrayDisposer.NewReturningBool(Natives.Winspool.FreePrinterNotifyInfo))
using (var notifyInfoSerializer = new InteropHelpers.StructSerializer<Natives.Structures.PRINTER_NOTIFY_INFO>())
{
var notifyInfo = SpecialStructures.PrinterNotifyInfo.Deserialize(notifyInfoPointer);
if (notifyInfo.DataList.Count == 0)
{
throw new InteropHelpers.NativeCodeException("add-job notification with no data?!", "FindNextPrinterChangeNotification");
}
if (notifyInfo.DataList[0].Type != Natives.Constants.JOB_NOTIFY_TYPE)
{
throw new InteropHelpers.NativeCodeException("add-job notification with no job-related data?!", "FindNextPrinterChangeNotification");
}
// pause it
// (need to subtract 1 because 0 is the stopping semaphore)
if (!Natives.Winspool.SetJob(printerHandlesDisposer.Handles[(int)waitResult - 1], notifyInfo.DataList[0].ID, 0, IntPtr.Zero, Natives.Constants.JOB_CONTROL_PAUSE))
{
throw new InteropHelpers.NativeCodeException("pausing job failed", "SetJob");
}
}
}
}
}
}
}
public void PauseNewJobsProc(List <string> printersToPause)
{
if (printersToPause == null || printersToPause.Count == 0)
{
return;
}
// fetch the printer handles
using (var printerHandlesDisposer = InteropHelpers.HandleArrayDisposer.NewReturningBool(Natives.Winspool.ClosePrinter))
{
foreach (var printerName in printersToPause)
{
IntPtr printerHandle;
if (!Natives.Winspool.OpenPrinter(printerName, out printerHandle, IntPtr.Zero) || printerHandle == Natives.Constants.INVALID_HANDLE_VALUE)
{
throw new InteropHelpers.FatalNativeCodeException("failed to open printer " + printerName, "OpenPrinter2");
}
printerHandlesDisposer.Handles.Add(printerHandle);
}
// prepare notification options
using (var fieldsArrayBytes = new InteropHelpers.HGlobalBytes(1 * sizeof(ushort)))
using (var notifyOptionsTypeSerializer = new InteropHelpers.StructSerializer <Natives.Structures.PRINTER_NOTIFY_OPTIONS_TYPE>())
using (var notifyOptionsSerializer = new InteropHelpers.StructSerializer <Natives.Structures.PRINTER_NOTIFY_OPTIONS>())
{
Marshal.WriteInt16(fieldsArrayBytes.Pointer, (short)Natives.Constants.PRINTER_NOTIFY_FIELD_STATUS);
var notifyOptionsType = new Natives.Structures.PRINTER_NOTIFY_OPTIONS_TYPE {
Type = Natives.Constants.JOB_NOTIFY_TYPE,
Reserved0 = 0,
Reserved1 = 0,
Reserved2 = 0,
Count = 1,
Fields = fieldsArrayBytes.Pointer
};
notifyOptionsTypeSerializer.TheStruct = notifyOptionsType;
notifyOptionsTypeSerializer.Serialize();
var notifyOptions = new Natives.Structures.PRINTER_NOTIFY_OPTIONS {
Version = 2,
Flags = 0,
Count = 1,
Types = notifyOptionsTypeSerializer.StructPointer
};
notifyOptionsSerializer.TheStruct = notifyOptions;
notifyOptionsSerializer.Serialize();
// fetch the notifications
using (var notificationDisposer = InteropHelpers.HandleArrayDisposer.NewReturningBool(Natives.Winspool.FindClosePrinterChangeNotification))
{
foreach (var printerHandle in printerHandlesDisposer.Handles)
{
IntPtr notif = Natives.Winspool.FindFirstPrinterChangeNotification(printerHandle, Natives.Constants.PRINTER_CHANGE_ADD_JOB, 0, notifyOptionsSerializer.StructPointer);
if (notif == Natives.Constants.INVALID_HANDLE_VALUE)
{
throw new InteropHelpers.FatalNativeCodeException("failed to subscribe to notifications for a printer", "FindFirstPrinterChangeNotification");
}
notificationDisposer.Handles.Add(notif);
}
// prepare the array for waiting
IntPtr[] waitHandles = new IntPtr[notificationDisposer.Handles.Count + 1];
waitHandles[0] = StopSemaphore;
notificationDisposer.Handles.CopyTo(waitHandles, 1);
// and we wait and we wonder
for (;;)
{
uint waitResult = Natives.Kernel32.WaitForMultipleObjects((uint)waitHandles.Length, waitHandles, false, Natives.Constants.INFINITE);
if (waitResult >= waitHandles.Length)
{
throw new InteropHelpers.FatalNativeCodeException("waiting for printers failed", "WaitForMultipleObjects");
}
else if (waitResult == 0)
{
// stopping semaphore triggered
break;
}
IntPtr triggeredNotif = waitHandles[waitResult];
uint whatChanged;
IntPtr notifyInfoPointer;
if (!Natives.Winspool.FindNextPrinterChangeNotification(triggeredNotif, out whatChanged, notifyOptionsSerializer.StructPointer, out notifyInfoPointer))
{
throw new InteropHelpers.NativeCodeException("fetching change notification failed", "FindNextPrinterChangeNotification");
}
using (var notifyInfoDisposer = InteropHelpers.HandleArrayDisposer.NewReturningBool(Natives.Winspool.FreePrinterNotifyInfo))
using (var notifyInfoSerializer = new InteropHelpers.StructSerializer <Natives.Structures.PRINTER_NOTIFY_INFO>())
{
var notifyInfo = SpecialStructures.PrinterNotifyInfo.Deserialize(notifyInfoPointer);
if (notifyInfo.DataList.Count == 0)
{
throw new InteropHelpers.NativeCodeException("add-job notification with no data?!", "FindNextPrinterChangeNotification");
}
if (notifyInfo.DataList[0].Type != Natives.Constants.JOB_NOTIFY_TYPE)
{
throw new InteropHelpers.NativeCodeException("add-job notification with no job-related data?!", "FindNextPrinterChangeNotification");
}
// pause it
// (need to subtract 1 because 0 is the stopping semaphore)
if (!Natives.Winspool.SetJob(printerHandlesDisposer.Handles[(int)waitResult - 1], notifyInfo.DataList[0].ID, 0, IntPtr.Zero, Natives.Constants.JOB_CONTROL_PAUSE))
{
throw new InteropHelpers.NativeCodeException("pausing job failed", "SetJob");
}
}
}
}
}
}
}
