// Called just after invoking the COM method. The IntPtr is the same one that just got returned
// from MarshalManagedToNative. The return value is unused.
public object MarshalNativeToManaged(IntPtr pNativeData)
{
m_Control.cbStruct = Marshal.ReadInt32(pNativeData);
m_Control.dwLineID = Marshal.ReadInt32(pNativeData, 4);
m_Control.dwControl = Marshal.ReadInt32(pNativeData, 8);
m_Control.cControls = Marshal.ReadInt32(pNativeData, 12);
m_Control.cbmxctrl = Marshal.ReadInt32(pNativeData, 16);
m_Control.pamxctrl = new MixerControl[m_Control.cControls];
IntPtr pData = new IntPtr(pNativeData.ToInt64() + iMixLineContSize);
for (int x = 0; x < m_Control.cControls; x++)
{
m_Control.pamxctrl[x] = new MixerControl();
IntPtr ip = new IntPtr(pData.ToInt64() + (x * iMixContSize));
Marshal.PtrToStructure(ip, m_Control.pamxctrl[x]);
}
m_Control = null;
return m_Control;
}
// It appears this routine is never called
public void CleanUpManagedData(object ManagedObj)
{
m_Control = null;
}
public IntPtr MarshalManagedToNative(object managedObj)
{
IntPtr p;
// Cast the object back to a PropVariant
m_Control = managedObj as MixerLineControls;
if (m_Control != null)
{
// Create an appropriately sized buffer, blank it, and send it to
// the marshaler to make the COM call with.
int iSize2 = m_Control.cControls * iMixContSize;
p = Marshal.AllocCoTaskMem(iMixLineContSize + iSize2);
#if DEBUG
for (int x = 0; x < iMixLineContSize + iSize2; x++)
{
Marshal.WriteByte(p, x, 0xcc);
}
#endif
Marshal.StructureToPtr(m_Control, p, false);
Marshal.WriteIntPtr(p, iMixLineContSize - IntPtr.Size, new IntPtr(p.ToInt64() + iMixLineContSize));
}
else
{
p = IntPtr.Zero;
}
return p;
}