VS 2012 C#ActiveX控件开发总结

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ActiveX 控件以前也叫做OLE 控件或OCX 控件，它是一些软件组件或对象，可以将其插入到WEB 网页或其它应用程序中。使用ActiveX 插件，可以轻松方便的在Web 页中插入多媒体效果、交互式对象以及复杂程序等等。通常使用C++或VB 开发ActiveX 控件，本文探讨一下在Visual Studio 2012 环境中使用C#开发ActiveX 控件的技术实现。

一、ActiveX控件的开发

1、新建一个空白的解决方案

2、在解决方案上右击→添加→新建项目→Visual C#→Windows→Windows窗体控件库，输入名称为ActiveX。

点击确定，生成一个名为UserControl1的控件，继承自UserControl类，在上面拖一个按钮，并写入事件响应代码：

3、在新建的ActiveX控件库上右键→属性→应用程序→程序集信息→使程序集COM可见（M）。再切换到“生成”标签→勾选“为COM互操作注册”。

4、修改ActiveX的AssemblyInof.cs文件，添加如下代码：

5、为Control1.cs添加内容

添加命名空间using System.Runtime.InteropServices;

为控件创建GUID：工具→创建GUID，选个5，点击复制！

将GUID号粘贴到ActiveX.cs中，如下：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Drawing;using System.Data;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using System.Runtime.InteropServices;namespace ActiveX{    [Guid("D4176A17-2A33-4903-8F37-9EBDD7CAFFD3")]    public partial class UserControl1: UserControl    {        public UserControl1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            MessageBox.Show("Hello, GeoStorm!");        }    }}

6、为了让ActiveX 控件获取客户端的信任，控件类还需要实现一个名为“IObjectSafety”的接口。（注意：不能修改该接口的GUID 值）。

创建接口：右键ActiveX 工程—>添加—>新建项→Visual C#项→接口

代码如下：

using System;using System.Runtime.InteropServices;namespace ActiveXDemo{        [ComImport, GuidAttribute("CB5BDC81-93C1-11CF-8F20-00805F2CD064")]//固定不变的    [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);    }}

然后在控件类中集成并实现接口：

using System;using System.Windows.Forms;namespace ActiveXTest{    using System.Runtime.InteropServices;    [Guid("D4176A17-2A33-4903-8F37-9EBDD7CAFFD3"), ProgId("ActiveXDemo.UserControl1"), ComVisible(true)]    public partial class UserControl1: UserControl,IObjectSafety    {                #region IObjectSafety 成员 格式固定        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 = 0;        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 = 0;                    if (_fSafeForScripting == true)                        pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER;                    break;                case _IID_IPersistStorage:                case _IID_IPersistStream:                case _IID_IPersistPropertyBag:                    Rslt = S_OK;                    pdwEnabledOptions = 0;                    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;        }        #endregion                public UserControl1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            MessageBox.Show("Hello, GeoStorm");        }    }}

这样，一个ActiveX控件就开发完了！

二、ActiveX控件的部署

添加打包部署项目（VS2012需要单独安装InstallShield 2015 Limited Edition，并输入序列号），添加主输出，将其Register 属性设置为vsdrpCOM，完成后生成，本过程略过。

三、测试

1、新建web应用：

文件→新建→项目→Visual C#→Web→ASP.NET空Web应用程序→WebApplication1→添加到解决方案。

2、添加Web页面

右键→添加→Web窗体

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>    <title></title></head><body>    <div>    <object id="ActiveX" classid="clsid:0973CD43-BED3-4468-86E9-B0D2344F54D6" codebase="test.cab"></object>    <input type="button" onclick="alert(ActiveX.ForDefault());" value=" 提交( 前台调用控件方法)" />    </div></body></html>

3、在IE浏览器中查看效果

四、ActiveX控件打包（.cab）与客户端自动安装

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