Marshalling Structure to Byte

[Zoser]

When marshalling structure from C to .NET, I get the
following error:
System.ArgumentException: Type could not be marshaled because the
length of an embedded array instance does not match the declared
length in the layout.
//////////////

[StructLayout(LayoutKind::Sequential, Pack=1, CharSet=CharSet::Ansi)] 
        ref struct MyStruct
        {
    [MarshalAs(UnmanagedType::ByValArray, SizeConst=1024 )]
            array<Byte>^data;
        };
/////////////////////////////////
    array<Byte> ^Serialize(MyStruct ^Struct)
        {
    int len=Marshal::SizeOf(Struct);
    IntPtr ptr=Marshal::AllocHGlobal(len);
    array<Byte>^ rawdatas = gcnew array<Byte>(len);
    Marshal::StructureToPtr(Struct,ptr,false);            
    Marshal::Copy( ptr, rawdatas, 0, len ); 
    Marshal::FreeHGlobal( ptr );     
    return rawdatas; 
        }
/////////////////////////////
 MyStruct ^my=gcnew MyStruct;
 my->data=Encoding::Unicode->GetBytes("Example");
    Serialize(my);

[Frinavale]

When marshalling structure from C to .NET, I get the
following error:
System.ArgumentException: Type could not be marshaled because the
length of an embedded array instance does not match the declared
length in the layout.
//////////////

[StructLayout(LayoutKind::Sequential, Pack=1, CharSet=CharSet::Ansi)] 
        ref struct MyStruct
        {
    [MarshalAs(UnmanagedType::ByValArray, SizeConst=1024 )]
            array<Byte>^data;
        };
/////////////////////////////////
    array<Byte> ^Serialize(MyStruct ^Struct)
        {
    int len=Marshal::SizeOf(Struct);
    IntPtr ptr=Marshal::AllocHGlobal(len);
    array<Byte>^ rawdatas = gcnew array<Byte>(len);
    Marshal::StructureToPtr(Struct,ptr,false);            
    Marshal::Copy( ptr, rawdatas, 0, len ); 
    Marshal::FreeHGlobal( ptr );     
    return rawdatas; 
        }
/////////////////////////////
 MyStruct ^my=gcnew MyStruct;
 my->data=Encoding::Unicode->GetBytes("Example");
    Serialize(my);

When passing arrays between .NET and C code, you have to make sure that the data type and the array lengths are the same.