C#调用Delphi接口(ITest = interface)

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首先创建一个delphi的DLL工程

library testintfdll;{ Important note about DLL memory management: ShareMem must be the  first unit in your library's USES clause AND your project's (select  Project-View Source) USES clause if your DLL exports any procedures or  functions that pass strings as parameters or function results. This  applies to all strings passed to and from your DLL--even those that  are nested in records and classes. ShareMem is the interface unit to  the BORLNDMM.DLL shared memory manager, which must be deployed along  with your DLL. To avoid using BORLNDMM.DLL, pass string information  using PChar or ShortString parameters. }uses  SysUtils,  Classes,  uintf in 'uintf.pas';{$R *.res}exports  GetImpl;beginend.

接下来声明并实现接口

unit uintf;interfaceuses Windows;type  ITest = interface    ['{000A0299-A27A-4D35-9721-419AE6E83869}']    procedure ShowMessage(msg: PAnsiChar); stdcall;    function Add(a, b: Integer): Integer; stdcall;  end;  TTest = class(TInterfacedObject, ITest)  protected    procedure ShowMessage(msg: PAnsiChar); stdcall;    function Add(a, b: Integer): Integer; stdcall;  end;procedure GetImpl(out instance: ITest); stdcall;implementationprocedure GetImpl(out instance: ITest);begin  instance := TTest.Create;end;{ TTest }function TTest.Add(a, b: Integer): Integer;begin  Result := a + b;end;procedure TTest.ShowMessage(msg: PAnsiChar);begin  MessageBox(0, msg, 'title', ID_OK);end;end.

最后在c#中调用

using System;using System.Runtime.CompilerServices;using System.Runtime.InteropServices;using System.Windows.Forms;namespace CShapeTestClient{    [ComVisible(true)]    [ComImport, Guid("000A0299-A27A-4D35-9721-419AE6E83869"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]    public interface ITest    {        [MethodImplAttribute(MethodImplOptions.PreserveSig)]        void ShowMessage([MarshalAs(UnmanagedType.AnsiBStr)] string msg);        [MethodImplAttribute(MethodImplOptions.PreserveSig)]        int Add(int a, int b);    }        public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        [DllImport("testintfdll.dll", EntryPoint = "GetImpl",CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]        private static extern void GetImpl([MarshalAs(UnmanagedType.Interface)] out ITest instance);        private void button1_Click(object sender, EventArgs e)        {            ITest tester;            GetImpl(out tester);            tester.ShowMessage(textBox1.Text);            this.Text = tester.Add(100, 50).ToString();        }    }}

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