.net之ActiveX开发

1. 创建类



2. 设置工程属性

　　2.1. 在应用程序页中，打开 程序集信息 ,勾选 使程序集COM可见



　　2.2. 在 生成 页中， 勾选 为COM互操作注册



3. 添加用户控件

ActiveX以用户控件为载体，加载到网页中

4. 添加控件的GUID

　 ActiveX的用户控件均有一个独立的GUID标识，该GUID必须与工程的GUID不同。

4.1. 通过VS2010->工具->创建GUID



4.2. 引入`System.Runtime.InteropServices`

　 4.3. 将生成的GUID粘贴到用户控件类声明前

[Guid("4D39585B-7947-4197-8BDB-B0A6918B1098")]
public partial class ATC : UserControl
{
InitializeComponent();
}

5. 开发IObjectSafety接口

为了让ActiveX控件获得客户端的信任，用户控件必须实现`IObjectSafety`接口，并且下面的代码是固定的（GUID也不能变）

[ComImport, Guid("CB5BDC81-93C1-11CF-8F20-00805F2CD064")]
[InterfaceType(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);
}

6. 用户控件实现IObjectSafety接口

[Guid("4D39585B-7947-4197-8BDB-B0A6918B1098")]
public partial class ATC : UserControl, IObjectSafety
{
InitializeComponent();
}

#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

7. 获取ActiveX的Classid

　　7.1. 打开VS2010->工具->OleView(若没有就自行添加，程序路径：C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin\OleView.exe)。

　　7.2. 在`Object Classes`->`Grouped by Component Category`->`.NET Category`找到刚才新建的ActiveX控件

　　7.3. 右键复制HTML标签

　　


8. 页面引用ActiveX控件

在html页面上

<object classid="clsid:ActiveX控件的clsid" codebase="控件打包后的exe文件名或cab文件名" width="200px" height="200px">
</object>

8.1. classid：用于指定要加载的ActiveX的clsid，clasid就是用户控件的GUID值；

　　8.2. codebase：用于指定clasid的基本URL，可为绝对或相对路径，因ActiveX控件被打包到安装包中，所以codebase必须为安装包的路径。

　　8.3. 实例：页面URL为www.test.com/index.html，codebase为test.cab（或test.exe），classid为clasid:xxxxxxxxxxxxxxxxx。那么ActiveX控件的绝对路径就是　　　　　 www.text.com/test.cab(或test.exe)/xxxxxxxxxxxxxxx。