private static WinXpDllInterface.MIXERINFO InnerGetMixerInfo()
{
WinXpDllInterface.MIXERLINE mxl = new WinXpDllInterface.MIXERLINE();
WinXpDllInterface.LINECONTROLS mlc = new WinXpDllInterface.LINECONTROLS();
mxl.cbStruct = (uint)Marshal.SizeOf(typeof(WinXpDllInterface.MIXERLINE));
mlc.cbStruct = (uint)Marshal.SizeOf(typeof(WinXpDllInterface.LINECONTROLS));
WinXpDllInterface.mixerGetLineInfo(0, ref mxl, WinXpDllInterface.MIXER_OBJECTF_MIXER | WinXpDllInterface.MIXER_GETLINEINFOF_DESTINATION);
mlc.dwLineID = mxl.dwLineID;
mlc.cControls = mxl.cControls;
mlc.cbmxctrl = (uint)Marshal.SizeOf(typeof(WinXpDllInterface.MIXERCONTROL));
mlc.pamxctrl = Marshal.AllocHGlobal((int)(mlc.cbmxctrl * mlc.cControls));
WinXpDllInterface.mixerGetLineControls(0, ref mlc, WinXpDllInterface.MIXER_OBJECTF_MIXER | WinXpDllInterface.MIXER_GETLINECONTROLSF_ALL);
WinXpDllInterface.MIXERINFO rtn = new WinXpDllInterface.MIXERINFO();
for (int i = 0; i < mlc.cControls; i++)
{
WinXpDllInterface.MIXERCONTROL mxc = (WinXpDllInterface.MIXERCONTROL)Marshal.PtrToStructure((IntPtr)((int)mlc.pamxctrl + (int)mlc.cbmxctrl * i), typeof(WinXpDllInterface.MIXERCONTROL));
switch (mxc.dwControlType)
{
case WinXpDllInterface.MIXERCONTROL_CONTROLTYPE_VOLUME:
rtn.volumeCtl = mxc.dwControlID;
rtn.minVolume = mxc.Bounds.lMinimum;
rtn.maxVolume = mxc.Bounds.lMaximum;
break;
case WinXpDllInterface.MIXERCONTROL_CONTROLTYPE_MUTE:
rtn.muteCtl = mxc.dwControlID;
break;
}
}
Marshal.FreeHGlobal(mlc.pamxctrl);
return(rtn);
}
private static bool GetIsMuted()
{
bool result = false;
InvokeTryCatch("WinXpVolumeOperate.GetIsMuted", () =>
{
WinXpDllInterface.MIXERINFO mixer = InnerGetMixerInfo();
WinXpDllInterface.MIXERDETAILS mcd = new WinXpDllInterface.MIXERDETAILS();
mcd.cbStruct = Marshal.SizeOf(typeof(WinXpDllInterface.MIXERDETAILS));
mcd.dwControlID = (int)mixer.muteCtl;
mcd.cChannels = 1;
mcd.cbDetails = 4;
mcd.paDetails = Marshal.AllocHGlobal((int)mcd.cbDetails);
WinXpDllInterface.mixerGetControlDetails(0, ref mcd, WinXpDllInterface.MIXER_GETCONTROLDETAILSF_VALUE | WinXpDllInterface.MIXER_OBJECTF_MIXER);
int rtn = Marshal.ReadInt32(mcd.paDetails);
Marshal.FreeHGlobal(mcd.paDetails);
result = rtn != 0;
});
return(result);
}
