Get master volume value

Here is a simple code to obtain a master volume value in Windows:

Code:

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HMIXER                          hMixer;
MIXERLINE                      ml  = {0};

memset (&ml, 0, sizeof (MIXERLINE));


// get a handle to the mixer device
result = mixerOpen(&hMixer, 0, 0, 0, MIXER_OBJECTF_HMIXER);
   
if (MMSYSERR_NOERROR == result)
{
        ml.cbStruct        = sizeof(MIXERLINE);
        ml.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;

        // get the speaker line of the mixer device

        result = mixerGetLineInfo((HMIXEROBJ) hMixer, &ml,
        MIXER_GETLINEINFOF_COMPONENTTYPE);

  .......................
}

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the mixer is opened OK. But I get MMSYSERR_INVALPARAM error on the bold line.

This code works perfectly on all machines but one. That computer has a built-in sound card from Realtek.

Does anyone know why it could happen?

Thanks a lot.

Have you been able to find a solution to this? I'm facing the same problem and I too have a Realtek soundcard.
Thanks.

I doubt that he's still monitoring this thread after 6 years!

You should open a new thread for this question.

In addition to krmed, when you provide the code snippet, please make sure that it can effectively reproduce the issue that you are having.

As for MMSYSERR_INVALPARAM, according to MSDN, it indicates that

Quote:

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One or more parameters are invalid.

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Therefore, which parameter is exactly not right, you can figure out best without anything concrete for others to take a look.