/// <summary>
/// Gets the control details
/// </summary>
protected void GetControlDetails()
{
mixerControlDetails.cbStruct = Marshal.SizeOf(mixerControlDetails);
mixerControlDetails.dwControlID = mixerControl.dwControlID;
if (IsCustom)
{
mixerControlDetails.cChannels = 0;
}
else if ((mixerControl.fdwControl & MixerInterop.MIXERCONTROL_CONTROLF_UNIFORM) != 0)
{
mixerControlDetails.cChannels = 1;
}
else
{
mixerControlDetails.cChannels = nChannels;
}
if ((mixerControl.fdwControl & MixerInterop.MIXERCONTROL_CONTROLF_MULTIPLE) != 0)
{
mixerControlDetails.hwndOwner = (IntPtr)mixerControl.cMultipleItems;
}
else if (IsCustom)
{
mixerControlDetails.hwndOwner = IntPtr.Zero; // TODO: special cases
}
else
{
mixerControlDetails.hwndOwner = IntPtr.Zero;
}
if (IsBoolean)
{
mixerControlDetails.cbDetails = Marshal.SizeOf(new MixerInterop.MIXERCONTROLDETAILS_BOOLEAN());
}
else if (IsListText)
{
mixerControlDetails.cbDetails = Marshal.SizeOf(new MixerInterop.MIXERCONTROLDETAILS_LISTTEXT());
}
else if (IsSigned)
{
mixerControlDetails.cbDetails = Marshal.SizeOf(new MixerInterop.MIXERCONTROLDETAILS_SIGNED());
}
else if (IsUnsigned)
{
mixerControlDetails.cbDetails = Marshal.SizeOf(new MixerInterop.MIXERCONTROLDETAILS_UNSIGNED());
}
else
{
// must be custom
mixerControlDetails.cbDetails = mixerControl.Metrics.customData;
}
var detailsSize = mixerControlDetails.cbDetails * mixerControlDetails.cChannels;
if ((mixerControl.fdwControl & MixerInterop.MIXERCONTROL_CONTROLF_MULTIPLE) != 0)
{
// fixing issue 16390 - calculating size correctly for multiple items
detailsSize *= (int)mixerControl.cMultipleItems;
}
IntPtr buffer = Marshal.AllocCoTaskMem(detailsSize);
// To copy stuff in:
// Marshal.StructureToPtr( theStruct, buffer, false );
mixerControlDetails.paDetails = buffer;
MmResult err = MixerInterop.mixerGetControlDetails(mixerHandle, ref mixerControlDetails,
MixerFlags.Value | mixerHandleType);
// let the derived classes get the details before we free the handle
if (err == MmResult.NoError)
{
GetDetails(mixerControlDetails.paDetails);
}
Marshal.FreeCoTaskMem(buffer);
if (err != MmResult.NoError)
{
throw new MmException(err, "mixerGetControlDetails");
}
}
