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如何写ActiveX控件（activex控件在哪儿设置）

nanyue 2024-09-27 12:49:18 技术文章 9 ℃

1.创建Windows窗体控件库

这里的项目项目名称为: TestActiveX

在默认的用户控件上,放置一个button,并创建单击事件

3.创建IObjectSafety接口(重点)

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);
}

4.将下面的代码,粘贴在控件类中

#region IObjectSafety  接口成员实现（直接拷贝即可）

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

5.在控件类,加上Guid特性,生成一个guid,这个在web页面使用的(切记)

[Guid("4a202141-e8fc-42c8-b061-5d2c5f5cd35d")] //记住这个Guid在页面上使用,要用这个
public partial class UserControl1 : UserControl, IObjectSafety
{
    //此处省略若干代码和事件代码
}

6.设置程序集信息和注册com互操作

在项目属性,应用程序->程序集信息

设置程序集com可见

在项目属性,生成->为com互操作注册

7.在页面使用ActiveX控件

在这之前,需要将Activex控件打包成应用程序,如果是vs2017的话,默认没有打包工具,在vs2017的应用商店中安装,搜索关键字 Installer 即可.

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>测试Activex控件</title>
</head>
<body>

    <!--控件id为clsid:后跟我们在控件类使用的guid,一定要一致,是因为要通过这个guid查找注册表,最终定位控件动态库-->
    <object id="TestActiveX" classid="clsid:4a202141-e8fc-42c8-b061-5d2c5f5cd35d" width="400" height="100">
    </object>

</body>
</html>

看测试结果:


最重要的一步
在AssemblyInfo.cs文件,添加以下代码

//一定要加的
[assembly: AllowPartiallyTrustedCallers()]

进入真正的主题,因为上面都是准备工作的

1.在控件类,添加该函数

/// <summary>
///  公开调用,该函数要public去修饰,其他和正常函数一样
/// </summary>
/// <param name="txt">文本参数</param>
/// <returns>返回调用结果</returns>
public string TestActiveXMethod(string txt)
{
    return #34;hello {txt}";
}

2.在页面上调用公开的csharp函数

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>测试Activex控件</title>
</head>
<body>

    <!--控件id为clsid:后跟我们在控件类使用的guid,一定要一致,是因为要通过这个guid查找注册表,最终定位控件动态库-->
    <!--这个时候,已经不需要显示控件了-->
    <object id="TestActiveX" classid="clsid:4a202141-e8fc-42c8-b061-5d2c5f5cd35d" width="0" height="0"></object>
    <input type="text" id="txtUserName" />
    <input type="button" id="btnCallActiveX" value="调用Activex控件中的函数" />
    <script>
        var btnCallActiveX = document.getElementById('btnCallActiveX');
        var txtUserName = document.getElementById('txtUserName');
        btnCallActiveX.onclick=function(){
            //调用ActiveX控件, 控件id 后跟控件公开的函数
            var callResult = TestActiveX.TestActiveXMethod(txtUserName.value);
            alert(callResult);
        };
    </script>

</body>
</html>

调用结果:

由于是迁移的文章,Activex现在用的比较少了,在特定的行业中还是有使用的,比如医疗行业软件,不过使用的是越来越少.

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