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 = 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; } }
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 == 0) { 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);
