C#ActiveX控件开发

1.新建项目，选择C#，选择.NET Framework2.0，新建一个Windows窗体控件库项目，命名为ActiveXDemo;

2.右击ActiveXDem项目，选择属性——应用程序——程序集信息，勾选“使程序集COM可见”；

3.右击ActiveXDem项目，选择属性——应用程序——生成，勾选“为COM互操作注册”（注意，此处如果是在debug状态下修改的，那么在调到release状态下还需要再设置一次）；

4.右击ActiveXDem项目，添加一个“用户控件”，命名为MiugoX.cs，新建项目是会自动生成一个UserControl.cs,可以删除；

5.为控件类MiugoX.cs添加GUID，可以在工具——创建GUID，新建一个GUID

[Guid("A0FCB80C-97AB-4C33-B879-70B479169B2F"), ProgId("ActiveXDemo.MiugoX"), ComVisible(true)]

6.为了让ActiveX控件获得客户端的信任，控件类还需要实现一个名为“IObjectSafety”的接口（在实现IObjectSafety接口之后，浏览器就不会再弹出是否允许运行之类的对话框）。先创建该接口（注意，不能修改该接口的GUID值）：添加一个接口IObjectSafety，实现该接口的目的就是提高程序的安全性，以便客户端IE在不更改设置的情况下可以该运行ActiveX控件

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace ActiveXDemo
{
    [ComImport, GuidAttribute("A58D34F0-BAB8-4B13-915D-165384FBC44E")] //CB5BDC81-93C1-11CF-8F20-00805F2CD064 是定值，前面出错，GUID不能改变
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
     public interface IObjectSafety
    {
        [PreserveSig]
        int GetInterfaceSafetyOptions(ref Guid riid,
            [MarshalAs(UnmanagedType.U4)] ref int pdwSupportedOptions,
            [MarshalAs(UnmanagedType.U4)] ref int pdwEnabledOptions);
        [PreserveSig()]
        int SetInterfaceSafetyOptions(ref Guid riid,
            [MarshalAs(UnmanagedType.U4)] int dwOptionSetMask,
            [MarshalAs(UnmanagedType.U4)] int dwEnabledOptions);
    }
}

7.用户控件MiugoX.cs需要继承并实现IObjectSafety接口（固定格式，GUID不能改变）

public partial class MiugoX : UserControl, IObjectSafety
{
        private const string _IID_IDispatch = "{00020400-0000-0000-C000-000000000046}";
        private const string _IID_IDispatchEx = "{a6ef9860-c720-11d0-9337-00a0c90dcaa9}";
        private const string _IID_IPersistStorage = "{0000010A-0000-0000-C000-000000000046}";
        private const string _IID_IPersistStream = "{00000109-0000-0000-C000-000000000046}";
        private const string _IID_IPersistPropertyBag = "{37D84F60-42CB-11CE-8135-00AA004BB851}";
        private const int INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001;
        private const int INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002;
        private const int S_OK = ;
        private const int E_FAIL = unchecked((int)0x80004005);
        private const int E_NOINTERFACE = unchecked((int)0x80004002);
        private bool _fSafeForScripting = true;
        private bool _fSafeForInitializing = true;
        public int GetInterfaceSafetyOptions(ref Guid riid, ref int pdwSupportedOptions, ref int pdwEnabledOptions)
        {
            int Rslt = E_FAIL;
            string strGUID = riid.ToString("B");
            pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER |INTERFACESAFE_FOR_UNTRUSTED_DATA;
            switch (strGUID)
            {
                case _IID_IDispatch:
                case _IID_IDispatchEx: Rslt = S_OK;
                    pdwEnabledOptions = ;
                    if (_fSafeForScripting == true)
                        pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER; break;
                case _IID_IPersistStorage:
                case _IID_IPersistStream:
                case _IID_IPersistPropertyBag: Rslt = S_OK;
                    pdwEnabledOptions = ;
                    if (_fSafeForInitializing == true)
                        pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA; break;
                default:
                    Rslt = E_NOINTERFACE; break;
            }
            return Rslt;
        }
        public int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions)
        {
            int Rslt = E_FAIL;
            string strGUID = riid.ToString("B"); switch (strGUID)
            {
                case _IID_IDispatch:
                case _IID_IDispatchEx:
                    if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_CALLER) && (_fSafeForScripting == true)) Rslt = S_OK; break;
                case _IID_IPersistStorage:
                case _IID_IPersistStream:
                case _IID_IPersistPropertyBag:
                    if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_DATA) &&
                         (_fSafeForInitializing == true))
                        Rslt = S_OK; break;
                default:
                    Rslt = E_NOINTERFACE; break;
            }
            return Rslt;
        }
}

8.按照windows窗体的思路完成控件的开发，从工具箱中拖拽控件并编写事件和方法

public void SayHelloWord()
        {
            MessageBox.Show("你好 ActiveX !");
        }
        public void ShowMessage(string msg)
        {
            MessageBox.Show(msg);
        }
        public string GetHelloWord()
        {
            return "Hello ActiveX";
        }
        public void CreateText()
        {
            labelResult.Text = ""; if (txtFileName.Text == "")
            {
                labelResult.Text = "请输入文件名?"; return;
            }
            string dir = "C:\\ActiveDemo";
            string filePath = dir + "\\" + txtFileName.Text + ".txt"; if (!Directory.Exists(dir))
            {
                Directory.CreateDirectory(dir);
            }
            if (!File.Exists(filePath))
            {
                File.CreateText(filePath);
                labelResult.Text += filePath + "创建成功\r\n";
            }
            else
            {
                labelResult.Text += filePath + "已存在";
            }
        }
        public void GetFiles()
        {
            string dir = "C:\\ActiveDemo"; if (!Directory.Exists(dir))
            {
                Directory.CreateDirectory(dir);
            }
            string[] fileNameList = Directory.GetFiles(dir); if (fileNameList.Length == )
            {
                labelResult.Text = "没有文件"; return;
            }
            StringBuilder sb = new StringBuilder(); foreach (string fileName in fileNameList)
            {
                sb.Append(fileName + "\r\n");
            }
            labelResult.Text = "";
            labelResult.Text = sb.ToString();
        }
        private void btnCreate_Click(object sender, EventArgs e)
        {
            CreateText();
        }
        private void btnGet_Click(object sender, EventArgs e)
        {
            GetFiles();
        }

9.这时ActiveX控件已经开发完成,右击项目名称，选择生成（Dll注册时一直提示不是以管理员身份运行，这时需要在所有程序——VS2010右击以管理员身份运行，再次重新生成，在注册表中就可以看到已经注册的dll。）

10.ActiveX控件调试,新建一个html页面，添加如下代码：

<html>
<head>
</head>
<body>
<object id="activeXDemo" classid="clsid:A0FCB80C-97AB-4C33-B879-70B479169B2F" codebase="Install/ActiveXDemo.cab#version=1,2,0,0/"></object>
<input type="button" value="click me" onclick="activeXDemo.ShowMessage('Today Exam')"/>
</body>
</html>

用Ie浏览器打开，底部会提示是否允许ActiveX运行，选择是，并弹出如下对话框

选择是，即可操作ActiveX控件。

总结：既可以通过classid进行调用，也可以通过JS方法实现互操作

var Excel = new ActiveXObject("ActiveXDemo.Miugox");
alert(Excel.SayHelloWord);