C#开发ActiveX控件,.NET开发OCX控件案例(3)

时间:2009-12-21 11:47来源:未知作者:admin 点击: 次

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完成控件开发后，为了使该用户控件作为一个ActiveX控件进行使用，还需要做以下修改：首先，为控件类添加GUID，这个编号将用于B/S系统的客户端调用时使

完成控件开发后，为了使该用户控件作为一个ActiveX控件进行使用，还需要做以下修改：
首先，为控件类添加GUID，这个编号将用于B/S系统的客户端调用时使用（可以使用工具-创建GUID 菜单创建一个GUID）：

Guid("4A44CF4E-F859-4328-AA22-3E9D7AFFF1AB")]
public partial class Hello : UserControl
{

其次，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。先创建该接口（注意，不能修改该接口的GUID值）：

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace Preresearch.CSharpActiveX
{
    [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);
    }
}

然后在控件类中继承并实现该接口：

#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

这样，一个ActiveX控件就开发完成了。