Question

It is a simple sample.

CodeDLL.cpp File:

extern "C" {
    __declspec(dllexport) int __cdecl SimulateGameDLL (int a, int b) {
              return a*b; // Calculation in native code
      }
}

GameSharp.cs File:

static class GameSharp
{
    public static class UnsafeNativeMethods
    {
        const string _dllLocation = "CoreDLL.dll";

        [DllImport(_dllLocation)]
        public static extern int SimulateGameDLL(int a, int b);
    }
}

or

static class GameSharp
{
    public static class GameSharpClass
    {       
        public static int SimulateGameDLL(int a, int b) {
             return a*b; //Calculation in managed code
        }
    }
}

The first one : I have a dll file that written in c++ native code and i try to call function in it in the managed code.(wrapper)

In the second one i have convert it to Managed Code.
My Code is not as simple as this.Which One is better Convert My c++ native code to Managed Or Call it form Managed Code.
Which one is faster? Why?

If this is not clear, please tell me i will discuss it more.don’t vote it to close before tell me. 🙂 thanks

Answer 1

I believe when it comes to performance in .NET there isn’t a noticeable difference between managed and unmanaged code.

I would convert your unmanaged code to managed if its all running on .NET anyway.

I just think you shouldn’t be worried about a performance bottleneck at this level. If your doing game development, you should be worried about performance when it comes to networking and graphics (use shaders).

EDIT:

http://msdn.microsoft.com/en-us/library/bb677124.aspx

“Maximum speed of execution. The managed layer adds around 10% overhead to the program.” (for windows mobile)