Marshal.AllocHGlobal VS Marshal.AllocCoTaskMem, Marshal.SizeOf VS sizeof()

Question

I have the following struct:

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct WAVEHDR
{
    internal IntPtr lpData;   // pointer t         


        

Answer 1

2) As far as I know the sizeof can only be used with types that have a predefined size at the compile-time.

So use Marshal.SizeOf(typeof(WAVEHDR)).