Error "MMFaudioClient 4"

I'm create play file *.mp3:
[QUOTE]

#ifndef AUDIO_H_
#define AUDIO_H_
#include <MdaAudioSamplePlayer.h>

// CLASS DECLARATION

class CAudio : public CBase, public MMdaAudioPlayerCallback
{
public: // Constructors and destructor
static CAudio* NewL(const TDesC& aFileName);
static CAudio* NewLC(const TDesC& aFileName);
~CAudio();

public: // New methods

void Play();
void Stop();
void SetVolume(TInt aVolume);
private:
CAudio();
void ConstructL(const TDesC& aFileName);

private:// From MMidiClientUtilityObserver
void MapcInitComplete(TInt aError, const TTimeIntervalMicroSeconds& aDuration);
void MapcPlayComplete(TInt aError);

private: // Member variables
CMdaAudioPlayerUtility* iPlayUtility;
};

#endif /* AUDIO_H_ */

[/QUOTE]


[QUOTE]
#include <eikenv.h>
#include "Audio.h"


CAudio::CAudio()
{
}

CAudio::~CAudio()
{
if(iPlayUtility)
{
iPlayUtility->Stop();
// iPlayUtility->Close();
}
delete iPlayUtility;
}

CAudio* CAudio::NewLC(const TDesC& aFileName)
{
CAudio* self = new (ELeave) CAudio();
CleanupStack::PushL(self);
self->ConstructL(aFileName);
return self;
}

CAudio* CAudio::NewL(const TDesC& aFileName)
{
CAudio* self = CAudio::NewLC(aFileName);
CleanupStack::Pop(self);
return self;
}

void CAudio::ConstructL(const TDesC& aFileName)
{
iPlayUtility = CMdaAudioPlayerUtility::NewFilePlayerL(aFileName, *this);
}

void CAudio::Play()
{
iPlayUtility->Play();
}

void CAudio::Stop()
{
iPlayUtility->Stop();
}

void CAudio::MapcPlayComplete(TInt /*aError*/)
{
iPlayUtility->Play();
}

void CAudio::MapcInitComplete(TInt aError, const TTimeIntervalMicroSeconds& /*aDuration*/)
{
if(aError == KErrNone)
{
//iPlayUtility->SetVolume(iPlayUtility->MaxVolume()/8);
}
}

void CAudio::SetVolume(TInt aVolume)
{
if (aVolume == 1)
{
iPlayUtility->SetVolume(iPlayUtility->MaxVolume());
}
else
{
iPlayUtility->SetVolume(aVolume);
}
}
[/QUOTE]

in My class, i call class CAudio.

[QUOTE]
iaudio = CAudio::NewL("C:\\1.mp3");
iaudio->SetVolume(1);
iaudio->Play();
[/QUOTE]

I'm debug. When it implement line "iaudio->SetVolume(1);", app Error "MMFaudioClient 4".
Can anyone help me!

hello,
i'm not on my pc, but have you already found this?
[url]http://www.developer.nokia.com/Community/Discussion/showthread.php?178974-Documentation-of-MMFAudioClient-4-panic-[/url]!
regards
pg

Thanks!
But I could not fix error.

you can also refer here: [url]http://blog.csdn.net/linzhiji/article/details/5288682[/url]

Convert the page to English & search for MMFAudioClient 4.

Basically you would need to understand that you can not play until the file is successfully opened, same could go with the setting volume. So do change your logic to start playing only after the MapcInitComplete is called without an error.