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C#开发ActiveX控件
前一段时间因项目需要,要把C#开发的Winfrom应用程序做成一个ActiveX控件,以便在IE中运行。网上关于C#写ActiveX控件的文章也不少,尽管用C#开发ActiveX控件有不少弊端,但项目的改写势在必行,也没有什么好的方法可以取代,用C#来改写还可以减少工作量,所以只好老老实实做下去。经过几天总算是完成任务了,中间也走了不少弯路,我把在项目改写过程中出现的问题记录下来,以供参考。
用C#开发ActiveX控件我主要参考红马的三篇文章,入门都是按照其文章上的步骤来的,几乎没有什么问题。但是要注意的是文章中的实现IObjectSafety接口有些问题,实现其接口后还是弹出窗口说ActiveX控件不是安全的。网上有正确的实现方法,我将其整理如下如下:
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
Code
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[ComImport, GuidAttribute("CB5BDC81-93C1-11CF-8F20-00805F2CD064")]
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[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
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interface IObjectSafety
4![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
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[PreserveSig]
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int GetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] ref int pdwSupportedOptions, [MarshalAs(UnmanagedType.U4)] ref int pdwEnabledOptions);
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[PreserveSig()]
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int SetInterfaceSafetyOptions(ref Guid riid, [MarshalAs(UnmanagedType.U4)] int dwOptionSetMask, [MarshalAs(UnmanagedType.U4)] int dwEnabledOptions);
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}
10![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
然后让你的ActiveX控件实现其接口,代码如下:
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
Code
1![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
实现IObjectSafety接口#region 实现IObjectSafety接口
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private const string _IID_IDispatch = "{00020400-0000-0000-C000-000000000046}";
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private const string _IID_IDispatchEx = "{a6ef9860-c720-11d0-9337-00a0c90dcaa9}";
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private const string _IID_IPersistStorage = "{0000010A-0000-0000-C000-000000000046}";
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private const string _IID_IPersistStream = "{00000109-0000-0000-C000-000000000046}";
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private const string _IID_IPersistPropertyBag = "{37D84F60-42CB-11CE-8135-00AA004BB851}";
7![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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private const int INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001;
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private const int INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002;
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private const int S_OK = 0;
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private const int E_FAIL = unchecked((int)0x80004005);
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private const int E_NOINTERFACE = unchecked((int)0x80004002);
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private bool _fSafeForScripting = true;
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private bool _fSafeForInitializing = true;
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//使ActiveX控件成为安全的控件
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public int GetInterfaceSafetyOptions(ref Guid riid, ref int pdwSupportedOptions, ref int pdwEnabledOptions)
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![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
{
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int Rslt = E_FAIL;
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string strGUID = riid.ToString("B");
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pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA;
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switch (strGUID)
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{
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case _IID_IDispatch:
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case _IID_IDispatchEx:
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Rslt = S_OK;
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pdwEnabledOptions = 0;
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if (_fSafeForScripting == true)
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pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER;
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break;
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case _IID_IPersistStorage:
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case _IID_IPersistStream:
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case _IID_IPersistPropertyBag:
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Rslt = S_OK;
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pdwEnabledOptions = 0;
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if (_fSafeForInitializing == true)
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pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA;
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break;
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default:
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Rslt = E_NOINTERFACE;
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break;
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}
43![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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return Rslt;
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}
46![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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public int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions)
48![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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int Rslt = E_FAIL;
50![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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string strGUID = riid.ToString("B");
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switch (strGUID)
53![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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case _IID_IDispatch:
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case _IID_IDispatchEx:
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if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_CALLER) && (_fSafeForScripting == true))
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Rslt = S_OK;
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break;
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case _IID_IPersistStorage:
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case _IID_IPersistStream:
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case _IID_IPersistPropertyBag:
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if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_DATA) && (_fSafeForInitializing == true))
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Rslt = S_OK;
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break;
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default:
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Rslt = E_NOINTERFACE;
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break;
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}
69![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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return Rslt;
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}
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#endregion
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另外需要注意的是,项目属性中,在“程序集信息”对话框中将“使程序集COM可见”复选框选上。属性“生成”卡中选中“为COM interop 注册”。
到此为止,用C#开发ActiveX控件基本上算是完成了,通过IE查看,可以看到效果。细节部分我没有写全,如有需要,可以参考红马文章:
http://www.cnblogs.com/homer/archive/2005/01/04/86473.html
http://www.cnblogs.com/homer/archive/2005/01/08/88780.html
http://www.cnblogs.com/homer/archive/2005/01/26/97822.html
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原文地址:https://www.cnblogs.com/answercard/p/1590058.html
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