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  • C#调用Delphi接口(ITest = interface)

    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;
    
    begin
    end.

    接下来声明并实现接口

    unit uintf;
    
    interface
    
    uses 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;
    
    implementation
    
    procedure 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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  • 原文地址:https://www.cnblogs.com/yzryc/p/6401582.html
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