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61 lines
1.8 KiB
Markdown
61 lines
1.8 KiB
Markdown
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# RegisterPowerStateChangeCallback
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```c
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NTSTATUS RegisterPowerStateChangeCallback(_Inout_ DEVICE_EXTENSION* pDeviceExtension)
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{
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#if DBG
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DbgPrintEx(DPFLTR_IHVNETWORK_ID,
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DPFLTR_INFO_LEVEL,
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" ---> RegisterPowerStateChangeCallback()\n");
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#endif /// DBG
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NT_ASSERT(pDeviceExtension);
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NTSTATUS status = STATUS_SUCCESS;
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OBJECT_ATTRIBUTES objectAttributes = {0};
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UNICODE_STRING unicodeString = {0};
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RtlInitUnicodeString(&unicodeString,
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L"\\Callback\\PowerState");
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InitializeObjectAttributes(&objectAttributes,
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&unicodeString,
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OBJ_CASE_INSENSITIVE,
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0,
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0);
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status = ExCreateCallback(&(pDeviceExtension->pCallbackObject),
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&objectAttributes,
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FALSE, /// Do not create as the system should already have done this
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TRUE); /// Allow multiple callbacks
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if(status != STATUS_SUCCESS)
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{
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DbgPrintEx(DPFLTR_IHVNETWORK_ID,
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DPFLTR_ERROR_LEVEL,
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" !!!! RegisterPowerStateChangeCallback : ExCreateCallback() [status: %#x]\n",
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status);
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HLPR_BAIL;
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}
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pDeviceExtension->pRegistration = ExRegisterCallback(pDeviceExtension->pCallbackObject,
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PowerStateCallback,
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pDeviceExtension);
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HLPR_BAIL_LABEL:
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#if DBG
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DbgPrintEx(DPFLTR_IHVNETWORK_ID,
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DPFLTR_INFO_LEVEL,
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" <--- RegisterPowerStateChangeCallback() [status: %#x]\n",
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status);
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#endif /// DBG
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return status;
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}
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```
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