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Added RegisterPowerStateChangeCallback

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This commit is contained in:
Benjamin Höglinger-Stelzer 2023-03-14 21:37:52 +01:00
parent 983423bcce
commit d864b69334
1 changed files with 60 additions and 0 deletions
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Snippets/WDM/RegisterPowerStateChangeCallback.md Normal file
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# RegisterPowerStateChangeCallback
```c
NTSTATUS RegisterPowerStateChangeCallback(_Inout_ DEVICE_EXTENSION* pDeviceExtension)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> RegisterPowerStateChangeCallback()\n");
#endif /// DBG
NT_ASSERT(pDeviceExtension);
NTSTATUS status = STATUS_SUCCESS;
OBJECT_ATTRIBUTES objectAttributes = {0};
UNICODE_STRING unicodeString = {0};
RtlInitUnicodeString(&unicodeString,
L"\\Callback\\PowerState");
InitializeObjectAttributes(&objectAttributes,
&unicodeString,
OBJ_CASE_INSENSITIVE,
0,
0);
status = ExCreateCallback(&(pDeviceExtension->pCallbackObject),
&objectAttributes,
FALSE, /// Do not create as the system should already have done this
TRUE); /// Allow multiple callbacks
if(status != STATUS_SUCCESS)
{
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_ERROR_LEVEL,
" !!!! RegisterPowerStateChangeCallback : ExCreateCallback() [status: %#x]\n",
status);
HLPR_BAIL;
}
pDeviceExtension->pRegistration = ExRegisterCallback(pDeviceExtension->pCallbackObject,
PowerStateCallback,
pDeviceExtension);
HLPR_BAIL_LABEL:
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- RegisterPowerStateChangeCallback() [status: %#x]\n",
status);
#endif /// DBG
return status;
}
```