[wdmaudiodev] Re: Virtual Audio Driver: Interacting with user-space application

  • From: Tim Roberts <timr@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 17 Jun 2020 10:49:09 -0700

Oleg Vorobiov wrote:

I have made the required changes:
1. IoCreateDevice, IoRegisterDeviceInterface, and other related things have been removed from the DriverEntry function.
2. In the AddDevice function (after the PcAddAdapterDevice function call) I call IoRegisterDeviceInterface and IoSetDeviceInterfaceState, as follows:

ntStatus =
    IoRegisterDeviceInterface(PhysicalDeviceObject
        , static_cast<LPCGUID>(&PID_MSVAD)
        , &DeviceRef
        , &DeviceName);

// Where DeviceRef is "CUSTOM_DEV", DeviceName is "\\Devices\\CUSTOM_DEV".

DeviceName is an output from this function.  You just pass an empty structure.


After that, I got a symbolic link using CM_Get_Device_Interface_List: *\\?\ROOT#MEDIA#0000#{5b722bf8-f0ab-47ee-b9c8-8d61d31375a1}\CUSTOM_DEV*

Unfortunately, I couldn't open the file via the symbolic link mentioned above (error description: "The system cannot find the file specified").

That is the correct approach, and that's approximately the right file name.  Double-check that you aren't mixing ASCII and Unicode.  It's an easy mistake to make.  I register the interface before the PcAddAdapterDevice call, but that shouldn't make a difference.

--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.

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