NPVR v5 no longer prevents shutdown with a remote

[stwarr]

As per the original post, I am talking about preventing the PC from entering sleep if triggered by (eg) a MCE remote. My usecase is HTPC running a 10 foot interface, with NextPVR server running on the same machine.

Ideally I’d like the same behaviour as WMC:

on & recording -> (power button) -> away mode -> (recording ends) -> sleep

If NextPVR cannot do this, is there any way of polling the server to determine the tuner status to allow an external app to achieve this?

[Graham]

...  is there any way of polling the server to determine the tuner status to allow an external app to achieve this?

Does this do what you want ... https://github.com/sub3/NextPVR/wiki/nscripthelper

[stwarr]

A quick peek into NPVRTray.exe using ildasm.exe looks like the code defines a custom WndProc(), along with all the necessary power control enum values including WM_POWERBROADCAST, PBT_APMQUERYSTANDBY/PBT_APMQUERYSUSPEND, BROADCAST_QUERY_DENY, etc. but doesn't actually use them. Is this code that could be shared at all?

Code:

.method family hidebysig virtual instance void
        WndProc(valuetype [System.Windows.Forms]System.Windows.Forms.Message& m) cil managed
{
  // Code size      61 (0x3d)
  .maxstack  8
  IL_0000:  ldarg.0
  IL_0001:  ldfld      bool NPVRTray.Form1::shutdownBlocked
  IL_0006:  brfalse.s  IL_0028
  IL_0008:  ldarg.1
  IL_0009:  call      instance int32 [System.Windows.Forms]System.Windows.Forms.Message::get_Msg()
  IL_000e:  ldc.i4.s  17
  IL_0010:  beq.s      IL_001c
  IL_0012:  ldarg.1
  IL_0013:  call      instance int32 [System.Windows.Forms]System.Windows.Forms.Message::get_Msg()
  IL_0018:  ldc.i4.s  22
  IL_001a:  bne.un.s  IL_0028
  IL_001c:  ldarg.1
  IL_001d:  ldsfld    native int [mscorlib]System.IntPtr::Zero
  IL_0022:  call      instance void [System.Windows.Forms]System.Windows.Forms.Message::set_Result(native int)
  IL_0027:  ret
  IL_0028:  ldarg.1
  IL_0029:  call      instance int32 [System.Windows.Forms]System.Windows.Forms.Message::get_Msg()
  IL_002e:  ldc.i4    0x218
  IL_0033:  pop
  IL_0034:  pop
  IL_0035:  ldarg.0
  IL_0036:  ldarg.1
  IL_0037:  call      instance void [System.Windows.Forms]System.Windows.Forms.Form::WndProc(valuetype [System.Windows.Forms]System.Windows.Forms.Message&)
  IL_003c:  ret
} // end of method Form1::WndProc

[sub]

A quick peek into NPVRTray.exe using ildasm.exe looks like the code defines a custom WndProc(), along with all the necessary power control enum values including WM_POWERBROADCAST, PBT_APMQUERYSTANDBY/PBT_APMQUERYSUSPEND, BROADCAST_QUERY_DENY, etc. but doesn't actually use them.

What version of windows are you running?

Those events can no longer be used to block standby in newer versions of Windows. Instead the try uses the following to block standby:

SetThreadExecutionState(ES_CONTINUOUS | ES_SYSTEM_REQUIRED | ES_AWAYMODE_REQUIRED);

If you're using some old version of Windows, maybe it's rejecting this call.

[stwarr]

Windows 10, build 2005, with all the latest updates

[sub]

What date/time is your NextPVRTray.exe?

[stwarr]

According to the MSDN docs, SetThreadExecutionState() is only applicable to preventing sleep due to the idle timeout, it does not prevent a user initiated sleep command. I’m certainly not an expert, but the evidence shows (as shown by other PVRs being able to create powercfg entries) that the ability to prevent user initiated sleep commands requests still exists in windows 10, and must be based on some other mechanism. I’m only aware of the WM_POWERBROADCAST messages (and nothing in the MSDN docs suggests these are deprecated in windows 10), but maybe I’ll try and find some time to play around with this.

[mvallevand]

The trap app is not blocking forced sleep or shutdown from the Start Menu on Win 10 2005 for me either. I didn't try on previous versions of Windows.

Martin

[sub]

Let me know if this helps.

There was a attempted bug fix in the last release, which I think I got the logic reversed (related to running NextPVRTray.exe on another machine).

[mvallevand]

That works for me.

Martin