How to set master volume?

[C++N00bie]

I'm trying to find a function that will be able to set the master volume and turn it on/off. Is there a function like waveOutSetVolume, but works for the master volume? thx

[C++N00bie]

Can anyone tell me why this code isn't working? It's supposed to mute the master volume.

#include <cstdlib>
#include <iostream>
#include <windows.h>

using namespace std;

int main(int argc, char *argv[])
{
MMRESULT result;
HMIXER hMixer;
result = mixerOpen(&hMixer, MIXER_OBJECTF_MIXER, 0, 0, 0);
MIXERLINE ml = {0};
ml.cbStruct = sizeof(MIXERLINE);
ml.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
result = mixerGetLineInfo((HMIXEROBJ) hMixer,
&ml, MIXER_GETLINEINFOF_COMPONENTTYPE);
MIXERLINECONTROLS mlc = {0};
MIXERCONTROL mc = {0};
mlc.cbStruct = sizeof(MIXERLINECONTROLS);
mlc.dwLineID = ml.dwLineID;
mlc.dwControlType = MIXERCONTROL_CONTROLTYPE_MUTE;
mlc.cControls = 1;
mlc.pamxctrl = &mc;
mlc.cbmxctrl = sizeof(MIXERCONTROL);
result = mixerGetLineControls((HMIXEROBJ) hMixer,
&mlc, MIXER_GETLINECONTROLSF_ONEBYTYPE);
MIXERCONTROLDETAILS mcd = {0};
MIXERCONTROLDETAILS_BOOLEAN mcb = {0};
mcb.fValue = true; //true for mute, false for unmute
mcd.paDetails = &mcb;
mcd.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
result = mixerSetControlDetails((HMIXEROBJ) hMixer,
&mcd, MIXER_SETCONTROLDETAILSF_VALUE);
return 0;
}

[Plasmator]

Can anyone tell me why this code isn't working? It's supposed to mute the master volume.

Why are you still not using code tags?

Anyhow, check the value of result and see what error it corresponds to.

[Prachir]

hey....i wanted to access my master volume using Qt which uses c++. Could you please post your code if its working. Thanks....