Question

I want to transfer a structure of data to an application which is created in C#.
I will be filling the structure in a VC++ program.

How can I send it?
Is structure suppported in C#?

Or else if I use LPDATA in VC++: how can I get the same thing in C#?

Answer 1

Defining the struct in C#

When defining your struct in C# make sure you use datatypes which match the C++ implementations. Char in C++ as Byte in C# etc…

You need to add some attributes to ensure your struct memory layout in C# matches the C++ implementation

[StructLayout(LayoutKind.Sequential, Size=TotalBytesInStruct),Serializable]
public struct MyStruct
{
}

Passing the struct

Declare a struct in C# using the same data structure. Pass a pointer to the struct to your C# app from C++ and cast it to the new struct in C#.

Calling you C# dll

For calling your C# DLL, your best option is to use a mixed mode assembly in C++. This allows you to use the pragmas managed and unmanaged to switch between native and managed code. This way you can nicely wrap you C# class with a workable C++ wrapper. See this Microsoft article. Be aware though, this is not supported on Mono.