去掉IE提示：在此页上的ActiveX控件和本页上的其他部分的交互可能不安全。你想允许这种交互吗？

由于项目需求，需要用到OCX控件。而在IE浏览器中加载OCX控件会有如下提示：

这是因为OCX控件有一个ID，而这个ID注册后IE不认为该OCX控件是安全的。所以，必须把这个控件注册为安全控件。

假设已经创建好OCX控件工程了。操作步骤如下：

第一步：在xxxApp类头文件（.h）添加如下函数声明。

// 去掉IE提示“此控件不安全的”提示框;
// Helper function to create a component category and associated
// description
HRESULT CreateComponentCategory(CATID catid, WCHAR* catDescription);
// Helper function to register a CLSID as belonging to a component
// category
HRESULT RegisterCLSIDInCategory(REFCLSID clsid, CATID catid);
// Helper function to unregister a CLSID as belonging to a component
// category
HRESULT UnRegisterCLSIDInCategory(REFCLSID clsid, CATID catid);

注意：这些函数声明不是xxxApp类成员函数声明，而是全局函数声明。

第二步：在xxxApp类的实现文件（.cpp）添加如下函数实现。

HRESULT CreateComponentCategory(CATID catid, WCHAR* catDescription)
{
    ICatRegister* pcr = NULL;
    HRESULT hr = S_OK;
    hr = CoCreateInstance(CLSID_StdComponentCategoriesMgr,
        NULL,
        CLSCTX_INPROC_SERVER,
        IID_ICatRegister,
        (void**)&pcr);
    if (FAILED(hr))
        return hr;
    // Make sure the HKCR/Component Categories/{..catid...}
    // key is registered
    CATEGORYINFO catinfo;
    catinfo.catid = catid;
    catinfo.lcid = 0x0409; // english
    // Make sure the provided description is not too long.
    // Only copy the first 127 characters if it is
    int len = wcslen(catDescription);
    if (len > 127)
        len = 127;
    wcsncpy(catinfo.szDescription, catDescription, len);
    // Make sure the description is null terminated
    catinfo.szDescription[len] = '/0';
    hr = pcr->RegisterCategories(1, &catinfo);
    pcr->Release();
    return hr;
}

HRESULT RegisterCLSIDInCategory(REFCLSID clsid, CATID catid)
{
    // Register your component categories information.
    ICatRegister* pcr = NULL;
    HRESULT hr = S_OK;
    hr = CoCreateInstance(CLSID_StdComponentCategoriesMgr,
        NULL,
        CLSCTX_INPROC_SERVER,
        IID_ICatRegister,
        (void**)&pcr);
    if (SUCCEEDED(hr))
    {
        // Register this category as being "implemented" by
        // the class.
        CATID rgcatid[1];
        rgcatid[0] = catid;
        hr = pcr->RegisterClassImplCategories(clsid, 1, rgcatid);
    }
    if (pcr != NULL)
        pcr->Release();
    return hr;
}

HRESULT UnRegisterCLSIDInCategory(REFCLSID clsid, CATID catid)
{
    ICatRegister *pcr = NULL;
    HRESULT hr = S_OK;
    hr = CoCreateInstance(CLSID_StdComponentCategoriesMgr,
        NULL, CLSCTX_INPROC_SERVER, IID_ICatRegister, (void**)&pcr);
    if (SUCCEEDED(hr))
    {
        // Unregister this category as being "implemented" by the class.
        CATID rgcatid[1];
        rgcatid[0] = catid;
        hr = pcr->UnRegisterClassImplCategories(clsid, 1, rgcatid);
    }
    if (pcr != NULL)
        pcr->Release();
    return hr;
}

第三步：在xxxApp类的实现文件（xxx.cpp）定义两个GUID用来注册控件的安全性，同时需要定义要注册为安全的CLSID。

const CATID CATID_SafeForScripting = { 0x7dd95801, 0x9882, 0x11cf, { 0x9f, 0xa9, 0x00, 0xaa, 0x00, 0x6c, 0x42, 0xc4 } };
const CATID CATID_SafeForInitializing = { 0x7dd95802, 0x9882, 0x11cf, { 0x9f, 0xa9, 0x00, 0xaa, 0x00, 0x6c, 0x42, 0xc4 } };

const CATID CLSID_SafeItem = { 0xedb3ce, 0xe6b9, 0x4883, { 0x83, 0xc0, 0x3f, 0xbb, 0x40, 0xf7, 0x58, 0x5f } };

两个GUID为CATID_SafeForScripting 、CATID_SafeForInitializing；安全的CLSID为CLSID_SafeItem。

在OCX控件注册完成后，在注册表的如下地方可以看到上面的两个GUID。

　　1）32位版本位置：

　　　　HKEY_CLASSES_ROOTWow6432NodeCLSID[xxxCtrl类的uuid]Implemented Categories，下面有这两个GUID。

　　2）64位版本位置：

　　　　HKEY_CLASSES_ROOTCLSID[xxxCtrl类的uuid]Implemented Categories，下面有这两个GUID。

　　注意：[xxxCtrl类的uuid]是xxx.idl文件中xxxCtrl的类信息的uuid。

CLSID_SafeItem的值是根据在xxxCtrl类实现文件（xxxCtrl.cpp）中IMPLEMENT_OLECREATE_EX的定义而来的（实际上就是ActiveX的CLASSID）。IMPLEMENT_OLECREATE_EX值如下：

第四步：修改OCX控件的注册、反注册代码。

// DllRegisterServer - 将项添加到系统注册表
STDAPI DllRegisterServer(void)
{
    //AFX_MANAGE_STATE(_afxModuleAddrThis);
    //if (!AfxOleRegisterTypeLib(AfxGetInstanceHandle(), _tlid))
    //    return ResultFromScode(SELFREG_E_TYPELIB);
    //if (!COleObjectFactoryEx::UpdateRegistryAll(TRUE))
    //    return ResultFromScode(SELFREG_E_CLASS);
    //return NOERROR;

    //新注册代码
    AFX_MANAGE_STATE(_afxModuleAddrThis);
    if (!AfxOleRegisterTypeLib(AfxGetInstanceHandle(), _tlid))
        return ResultFromScode(SELFREG_E_TYPELIB);
    if (!COleObjectFactoryEx::UpdateRegistryAll(TRUE))
        return ResultFromScode(SELFREG_E_CLASS);
    if (FAILED(CreateComponentCategory(
        CATID_SafeForScripting,
        L"Controls that are safely scriptable")))
        return ResultFromScode(SELFREG_E_CLASS);
    if (FAILED(CreateComponentCategory(
        CATID_SafeForInitializing,
        L"Controls safely initializable from persistent data")))
        return ResultFromScode(SELFREG_E_CLASS);
    if (FAILED(RegisterCLSIDInCategory(
        CLSID_SafeItem, CATID_SafeForScripting)))
        return ResultFromScode(SELFREG_E_CLASS);
    if (FAILED(RegisterCLSIDInCategory(
        CLSID_SafeItem, CATID_SafeForInitializing)))
        return ResultFromScode(SELFREG_E_CLASS);
    return NOERROR;
}

// DllUnregisterServer - 将项从系统注册表中移除
STDAPI DllUnregisterServer(void)
{
    //AFX_MANAGE_STATE(_afxModuleAddrThis);
    //if (!AfxOleUnregisterTypeLib(_tlid, _wVerMajor, _wVerMinor))
    //    return ResultFromScode(SELFREG_E_TYPELIB);
    //if (!COleObjectFactoryEx::UpdateRegistryAll(FALSE))
    //    return ResultFromScode(SELFREG_E_CLASS);
    //return NOERROR;

    //新反注册代码
    HRESULT hr;
    AFX_MANAGE_STATE(_afxModuleAddrThis);
    // Remove entries from the registry.
    hr = UnRegisterCLSIDInCategory(CLSID_SafeItem,
        CATID_SafeForInitializing);
    if (FAILED(hr))
        return hr;
    hr = UnRegisterCLSIDInCategory(CLSID_SafeItem,
        CATID_SafeForScripting);
    if (FAILED(hr))
        return hr;
    if (!AfxOleUnregisterTypeLib(_tlid, _wVerMajor, _wVerMinor))
        return ResultFromScode(SELFREG_E_TYPELIB);
    if (!COleObjectFactoryEx::UpdateRegistryAll(FALSE))
        return ResultFromScode(SELFREG_E_CLASS);
    return NOERROR;
}

 至此完成了注册安全性的OCX控件。