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    <p>I think one should take Stephen Martin's answer, make it accept a T, and use reflection to generically implement the MarshalManagedToNative and MarshalNativeToManaged methods. Then, you'll have a custom packed struct marshaler that will work for any type of struct.</p> <p>Here's the code:</p> <pre><code>using System; using System.Threading; using System.Reflection; using System.Runtime.InteropServices; namespace System.Runtime.InteropServices { public class PinnedObject : IDisposable { private GCHandle gcHandle = new GCHandle(); public PinnedObject(object o) { gcHandle = GCHandle.Alloc(o, GCHandleType.Pinned); } public unsafe static implicit operator byte*(PinnedObject po) { return (byte*)po.gcHandle.AddrOfPinnedObject(); } #region IDisposable Members public void Dispose() { if (gcHandle.IsAllocated) { gcHandle.Free(); } } #endregion } public class PackedStructMarshaler&lt;T&gt; : ICustomMarshaler where T : struct { private static ICustomMarshaler m_instance = new PackedStructMarshaler&lt;T&gt;(); public static ICustomMarshaler GetInstance() { return m_instance; } private void ForEachField(Action&lt;FieldInfo&gt; action) { foreach (var fi in typeof(T).GetFields(BindingFlags.Public | BindingFlags.NonPublic)) { // System.Diagnostics.Debug.Assert(fi.IsValueType); action(fi); } } private unsafe void MemCpy(byte* dst, byte* src, int numBytes) { for (int i = 0; i &lt; numBytes; i++) { dst[i] = src[i]; } } #region ICustomMarshaler Members public void CleanUpManagedData(object ManagedObj) { } public void CleanUpNativeData(IntPtr pNativeData) { Marshal.FreeHGlobal(pNativeData); } public int GetNativeDataSize() { unsafe { int ret = 0; ForEachField( (FieldInfo fi) =&gt; { Type ft = fi.FieldType; ret += Marshal.SizeOf(ft); }); return ret; } } private object m_marshaledObj = null; public unsafe IntPtr MarshalManagedToNative(object obj) { IntPtr nativeData = (IntPtr)0; if (obj != null) { if (m_marshaledObj != null) throw new ApplicationException("This instance has already marshaled a managed type"); m_marshaledObj = obj; nativeData = Marshal.AllocHGlobal(GetNativeDataSize()); byte* pData = (byte*)nativeData; int offset = 0; ForEachField( (FieldInfo fi) =&gt; { int size = Marshal.SizeOf(fi.FieldType); using (PinnedObject po = new PinnedObject(fi.GetValue(obj))) { MemCpy(pData + offset, po, size); } offset += size; }); } return nativeData; } public object MarshalNativeToManaged(IntPtr pNativeData) { if (m_marshaledObj != null) m_marshaledObj = null; unsafe { byte* pData = (byte*)pNativeData; int offset = 0; object res = new T(); ForEachField( (FieldInfo fi) =&gt; { int size = Marshal.SizeOf(fi.FieldType); fi.SetValue(res, (object)(*((byte*)(pData + offset)))); offset += size; }); return res; } } #endregion } } </code></pre>
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    1. POIs there an alternative for StructLayout "Pack" attribute in Compact Framework?
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    1. USJonathan Leonard
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