c# 调用 c++，delphi dll动态库

using System.Runtime.InteropServices; //引用



 [DllImport("Project2.dll", EntryPoint = "dadd", ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]
        public static extern int dadd(int a, int b); //DllImport请参照MSDN

        [DllImport("Project2.dll", EntryPoint = "SynAPP", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern string SynAPP(IntPtr i);

        [DllImport("Project2.dll", EntryPoint = "dshowmessage", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern void dshowmessage(string vmsg); //DllImport请参照MSDN

        [DllImport("Project2.dll", EntryPoint = "showform", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern void showform(); //DllImport请参照MSDN