OCX开发与第三方OCX封装

首先感谢网络上朋友们无私的共享，我才得以从一无所知到完美解决OCX开发中的问题，如果你也对OCX一窍不通，而需要在WEB客户端中操作第三方OCX，恰好第三方OCX又无法完全满足你的需求，那么这篇文章应该对你有所帮助，来吧。

1.创建一个MFC OCX工程

点击完成就ok了

现在你已经创建了一个OCX框架了，你想在WEB上应用吗？必须实现OCX安全机制，否则IE不会运行的，now，let go！

2.实现安全机制

在FIleView视图中，打开NewTestCtl.h文件，在public定义中插入如下代码

  //去掉安全警告 BEGIN
    DECLARE_INTERFACE_MAP()
        BEGIN_INTERFACE_PART(ObjectSafety, IObjectSafety)
        STDMETHOD(GetInterfaceSafetyOptions)(REFIID riid, DWORD __RPC_FAR *pdwSupportedOptions, DWORD __RPC_FAR *pdwEnabledOptions);
        STDMETHOD(SetInterfaceSafetyOptions)(REFIID riid, DWORD dwOptionSetMask, DWORD dwEnabledOptions);
    END_INTERFACE_PART(ObjectSafety)

//去掉安全警告 END

然后是TestfingerCtrl.CPP文件中IMPLEMENT_DYNCREATE(CTestfingerCtrl, COleControl)代码后面添加如下代码

//去掉安全警告 BEGIN
BEGIN_INTERFACE_MAP(CTestfingerCtrl, COleControl)
    INTERFACE_PART(CTestfingerCtrl, IID_IObjectSafety, ObjectSafety)
END_INTERFACE_MAP()

// Implementation of IObjectSafety
STDMETHODIMP CTestfingerCtrl::XObjectSafety::GetInterfaceSafetyOptions(
    REFIID riid,
    DWORD __RPC_FAR *pdwSupportedOptions,
    DWORD __RPC_FAR *pdwEnabledOptions)
{
    METHOD_PROLOGUE_EX(CTestfingerCtrl, ObjectSafety);
    if (!pdwSupportedOptions || !pdwEnabledOptions)
    {
        return E_POINTER;
    }
    *pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA;
    *pdwEnabledOptions = 0;
    if (NULL == pThis->GetInterface(&riid))
    {
        TRACE("Requested interface is not supported.\n");
        return E_NOINTERFACE;
    }
    // What interface is being checked out anyhow?
    OLECHAR szGUID[39];
    int i = StringFromGUID2(riid, szGUID, 39);
    if (riid == IID_IDispatch)
    {
        // Client wants to know if object is safe for scripting
        *pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER;
        return S_OK;
    }
    else if (riid == IID_IPersistPropertyBag
            || riid == IID_IPersistStreamInit
            || riid == IID_IPersistStorage
            || riid == IID_IPersistMemory)
    {
        // Those are the persistence interfaces COleControl derived controls support
        // as indicated in AFXCTL.H
        // Client wants to know if object is safe for initializing from persistent data
        *pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA;
        return S_OK;
    }
    else
    {
        // Find out what interface this is, and decide what options to enable
        TRACE("We didn't account for the safety of this interface, and it's one we support\n");
        return E_NOINTERFACE;
    }
}

STDMETHODIMP CTestfingerCtrl::XObjectSafety::SetInterfaceSafetyOptions(
    REFIID riid,
    DWORD dwOptionSetMask,
    DWORD dwEnabledOptions)
{
    METHOD_PROLOGUE_EX(CTestfingerCtrl, ObjectSafety);
    OLECHAR szGUID[39];
    // What is this interface anyway?
    // We can do a quick lookup in the registry under HKEY_CLASSES_ROOT\Interface
    int i = StringFromGUID2(riid, szGUID, 39);
    if (0 == dwOptionSetMask && 0 == dwEnabledOptions)
    {
        // the control certainly supports NO requests through the specified interface
        // so it"s safe to return S_OK even if the interface isn"t supported.
        return S_OK;
    }

    // Do we support the specified interface?
    if (NULL == pThis->GetInterface(&riid))
    {
        TRACE1("%s is not support.\n", szGUID);
        return E_FAIL;
    }

    if (riid == IID_IDispatch)
    {
        TRACE("Client asking if it's safe to call through IDispatch.\n");
            TRACE("In other words, is the control safe for scripting?\n");
        if (INTERFACESAFE_FOR_UNTRUSTED_CALLER == dwOptionSetMask && INTERFACESAFE_FOR_UNTRUSTED_CALLER == dwEnabledOptions)
        {
            return S_OK;
        }
        else
        {
            return E_FAIL;
        }
    }
    else if (riid == IID_IPersistPropertyBag
        || riid == IID_IPersistStreamInit
        || riid == IID_IPersistStorage
        || riid == IID_IPersistMemory)
    {
        TRACE("Client asking if it's safe to call through IPersist*.\n");
            TRACE("In other words, is the control safe for initializing from persistent data?\n");
        if (INTERFACESAFE_FOR_UNTRUSTED_DATA == dwOptionSetMask && INTERFACESAFE_FOR_UNTRUSTED_DATA == dwEnabledOptions)
        {
            return NOERROR;
        }
        else
        {
            return E_FAIL;
        }
    }
    else
    {
        TRACE1("We didn\"t account for the safety of %s, and it\"s one we support\n", szGUID);
        return E_FAIL;
    }
}

STDMETHODIMP_(ULONG) CTestfingerCtrl::XObjectSafety::AddRef()
{
    METHOD_PROLOGUE_EX_(CTestfingerCtrl, ObjectSafety)
    return (ULONG)pThis->ExternalAddRef();
}

STDMETHODIMP_(ULONG) CTestfingerCtrl::XObjectSafety::Release()
{
    METHOD_PROLOGUE_EX_(CTestfingerCtrl, ObjectSafety)
    return (ULONG)pThis->ExternalRelease();
}

STDMETHODIMP CTestfingerCtrl::XObjectSafety::QueryInterface(REFIID iid, LPVOID* ppvObj)
{
    METHOD_PROLOGUE_EX_(CTestfingerCtrl, ObjectSafety)
    return (HRESULT)pThis->ExternalQueryInterface(&iid, ppvObj);
}

//去掉安全警告 END

好了，编译吧，这次IE中可以使用了，IE需要classid，打开VC6光盘的COMMON\TOOLS目录，运行OLEVIEW.EXE文件，查看 controls下面newtest控件名字就得到classid了，下图是百度音乐的classid：3C294567-XXXXXXX

好了，基本的OCX框架有了，安全接口有了，下次该把第三方OCX集成进来了，做这个文章太累了，上传图片好麻烦，就不能简单点么？休息一下。