IXAudio2MasteringVoice error when enclosed in a ComPtr : 'Release': is not a member of 'IXAudio2MasteringVoice'

KeyC0de 31 Reputation points
2020-10-21T13:52:10.857+00:00

I'm following XAudio2 tutorial from Microsoft: https://video2.skills-academy.com/en-us/windows/win32/xaudio2/how-to--initialize-xaudio2

I'm on Windows 8.1 x64, Visual Studio 2017.

This is my code: 

#include "com_initializer.h"  
#include <xaudio2.h>  
#include <wrl/client.h>  
  
#pragma comment( lib, "xaudio2_8.lib" )  
  
namespace mwrl = Microsoft::WRL;  
  
int main()  
{  
	/// 1. Initialize COM  
	COMInitializer comInitializer;  
  
	/// 2. Create XAudio2 engine  
	mwrl::ComPtr<IXAudio2> pXaudio2;  
	HRESULT hres;  
	hres = XAudio2Create( &pXaudio2,  
		0u,  
		XAUDIO2_DEFAULT_PROCESSOR );  
	if ( FAILED( hres ) )  
	{  
		return hres;  
	}  
  
	/// 3. Create a mastering voice  
	mwrl::ComPtr<IXAudio2MasteringVoice> pMasterVoice;  
	hres = pXaudio2->CreateMasteringVoice( &pMasterVoice );  
	if ( FAILED( hres ) )  
	{  
		return hres;  
	}  
  
  
}

I get the following error:
Error C2039 - 'Release': is not a member of 'IXAudio2MasteringVoice'

It works fine if I replace the com pointers with raw pointers.

XAudio2 doesn't work with ComPtr s or what?

Windows API - Win32
Windows API - Win32
A core set of Windows application programming interfaces (APIs) for desktop and server applications. Previously known as Win32 API.
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C++
A high-level, general-purpose programming language, created as an extension of the C programming language, that has object-oriented, generic, and functional features in addition to facilities for low-level memory manipulation.
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Accepted answer
  1. Drake Wu - MSFT 991 Reputation points
    2020-10-22T03:34:49.797+00:00

    Hi, @KeyC0de ComPtr will automatically call the Release function after the pointer's life cycle ends: 

        ~ComPtr() throw()  
    {  
        InternalRelease();  
    }  
    unsigned long InternalRelease() throw()  
    {  
        unsigned long ref = 0;  
        T* temp = ptr_;  
  
        if (temp != nullptr)  
        {  
            ptr_ = nullptr;  
            ref = temp->Release();  
        }  
  
        return ref;  
    }

    IXAudio2MasteringVoice inherits from IXAudio2Voice, neither of which has a release method. So you got that error. The same as IXAudio2SourceVoice and IXAudio2SubmixVoice. Use them as @Castorix31 said: 

    IXAudio2Voice* pVoice;  
IXAudio2MasteringVoice* pMasterVoice;  
IXAudio2SourceVoice* pSourceVoice;  
IXAudio2SubmixVoice* pSubmixVoice;

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  1. Castorix31 83,101 Reputation points
    2020-10-21T19:57:48.64+00:00

    XAudio2 doesn't work with ComPtr s or what?

    For IXAudio2, yes, but for IXAudio2MasteringVoice you must use 

     IXAudio2MasteringVoice* pMasterVoice;

    like in MS sample : Audio.h

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