C#

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using System.Runtime.InteropServices;<br />
<br />
[StructLayout(LayoutKind.Sequential, Pack=1)]<br />
   public struct Test<br />
   {<br />
      public int i;<br />
      public string s;<br />
   }<br />
<br />
   [StructLayout(LayoutKind.Sequential, Pack=1)]<br />
   public struct Check<br />
   {<br />
      public int I;<br />
      public Test [] structArray ;<br />
<br />
      public int GetMySize()<br />
      {<br />
         int iSize = Marshal.SizeOf( I) + Marshal.SizeOf( typeof( Test)) * structArray.Length;<br />
         return iSize;<br />
      }<br />
<br />
      public void MarshalStructToPtr(ref IntPtr ptr)<br />
      {<br />
         Marshal.StructureToPtr(I ,ptr, true);<br />
         ptr = (IntPtr)((int)ptr + Marshal.SizeOf( I ));<br />
<br />
         for( int count = 0; count < structArray.Length; count ++ )<br />
         {<br />
            Marshal.StructureToPtr(structArray[count],ptr, true);<br />
            ptr = (IntPtr)((int)ptr + Marshal.SizeOf( structArray[count] ));<br />
         }<br />
<br />
      }<br />
<br />
      <br />
   }<br />
<br />
class ConvertStructToByteArray<br />
{<br />
<br />
public void Convert()<br />
{<br />
 Test test1 = new Test();<br />
            test1.i = 2;<br />
            test1.s = "test";<br />
<br />
            Check objCheck = new Check();<br />
            objCheck.I =10;<br />
            objCheck.structArray = new Test[1];<br />
            objCheck.structArray[0] = test1;<br />
<br />
            int Size = objCheck.GetMySize() ;<br />
            IntPtr pCheck = Marshal.AllocHGlobal((int)Size );<br />
            IntPtr Temp = pCheck;<br />
            objCheck.MarshalStructToPtr( ref Temp);<br />
        <br />
            byte[] bytearrCheck = new byte[ Size];<br />
            Marshal.Copy( pCheck , bytearrCheck , 0,(int)Size);<br />
            Marshal.FreeHGlobal( pCheck );<br />
}<br />
}