Passing struct between C# .exe and C++ .dll

See more:

C++

C#

The structure in C++ and C# is as follows. Marshaling, packing, and DllImport of byte[] in C# are difficult. help.

[c++]
struct TInfo
{
double Rate;
double Depth;
unsigned char* Img;
}

extern "C" __declspec(dllexport) void SetInfo(TInfo _info);

[c#]
public struct TInfo
{
public double Rate;
public double Depth;
public byte[] Img;
}
[DllImport("CPPDLL.dll", CallingConvention = CallingConvention.Cdecl)]
void SetInfo(TInfo _info);

What I have tried:

Marshaling, Pack=1 in c# and cdecl in c++