Marshaling C++ struct with fixed size array into C#

问题

I have a C# struct declared like so:

public struct AdvertisementData {
    public byte SomeId;
    [MarshalAs(UnmanagedType.LPArray , SizeConst = 12)]
    public byte[] AnArray;
  }

And it's C++ counterpart:

struct AdvertisementData {
  uint8_t SomeId;
  uint8_t AnArray[12];
};

When I try to send a reference to a stack-allocated instance of the above struct from C++ to C#, I get: "Structure field of type Byte[] can't be marshalled as LPArray." Any idea what I'm doing wrong?

回答1:

Try to marshal it as ByValArray:

 [MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
  public byte[] AnArray;

And also, are you sure that you do not need to set any LayoutKind for your struct?

来源：https://stackoverflow.com/questions/24538837/marshaling-c-struct-with-fixed-size-array-into-c-sharp