Question

I am trying to implement watershed image segmentation as said by former programmer in :

Watershed using c# or c++

I tried adding FilterGrayToGray.cs code too but i got error of win32.memcpy

The error shows: “The name win32 doesn’t exists in this context”

if we convert Win32.memcpy to Microsoft.Win32.memcpy then it says “memcpy doesn’t exists in the namespace”

Answer 1

memcpy isn’t part of the .NET Framework – memcpy is an unmanaged native API that needs to have a p/Invoke definition created. The defination for memcpy must be in a different file.

See the example below:

/// <summary>
/// Windows API functions and structures.
/// </summary>
internal static class Win32
{
    /// <summary>
    /// Copy a block of memory.
    /// </summary>
    ///
    /// <param name="dst">Destination pointer.</param>
    /// <param name="src">Source pointer.</param>
    /// <param name="count">Memory block's length to copy.</param>
    ///
    /// <returns>Return's the value of <b>dst</b> - pointer to destination.</returns>
    ///
    [DllImport( "ntdll.dll", CallingConvention = CallingConvention.Cdecl )]
    public static extern IntPtr memcpy(
        IntPtr dst,
        IntPtr src,
        UIntPtr count );
    }
}