C#ActiveX控件开发学习

一：C#ActiveX控件开发注意事项

1:C#开发的ActiveX控件只可在装有Framework的系统上才能用。

2:只有IE浏览器支持。

3:初次安装需要导入代码签名证书及其证书链的方式,

或者Windows其实默认内置了一些权威的CA机构证书，可以向这些机构申请一份代码签名证书及私钥文件来对ActiveX控件签名，这样就可以避免该问题了。但是，向权威的CA机构申请证书是需要付费的，所以需要权衡成本和易用性后，再做出选择。

二：开发步骤

ActiveX控件以前也叫做OLE控件，它是微软IE支持的一种软件组件或对象，可以将其插入到Web页面中，实现在浏览器端执行动态程序功能，以增强浏览器端的动态处理能力。通常ActiveX控件都是用C++或VB语言开发，本文介绍另一种方式，在.NET Framework平台上，使用C#语言开发ActiveX控件。

1:必须继承并实现IObjectSafety接口

[ComImport, GuidAttribute("CB5BDC81-93C1-11CF-8F20-00805F2CD064")]

[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);

}

2：通常我们会先定义这么一个控件基类去实现改接口

ActiveXControl控件基类

public abstract class ActiveXControl : IObjectSafety

{

#region IObjectSafety 成员

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

}

3：实现自己的ActiveX控件功能开发

MacActiveX控件类
[Guid("65D8E97F-D3E2-462A-B389-241D7C38C518")]
public class MacActiveX : ActiveXControl
{
     public string GetMacAddress()
     {
         var mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
         var mos = mc.GetInstances();
         var sb = new StringBuilder();

         foreach (ManagementObject mo in mos)
         {
             var macAddress = mo["MacAddress"];

             if (macAddress != null)
                 sb.AppendLine(macAddress.ToString());
         }

         return sb.ToString();
     }
}

三：使用C#开发ActiveX控件控件开发、制作CAB包、签名、部署

详情见http://www.cr173.com/html/20985_1.html

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C#ActiveX控件开发学习

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