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要想创建一个能够在IE中成功加载而没有“不安全”的警告或者错误提示信息的ActiveX控件，我们必须实现安全的初始化和脚本。关于安全初始化的更加详细的信息，请参考本文结尾的参考资料“Safe Initialization and Scripting for ActiveX Controls”。基本上，所有要做的工作都是在DllRegisterServer 和DllUnregisterServer这两个函数中完成的。下面，我们就来一步步地将我们的ActiveX控件变成一个“安全的”控件。
1.编辑MyActiveX.cpp并添加如下的代码。其中，CLSID_SafeItem的值应该跟MyActiveXCtrl.cpp中的IMPLEMENT_OLECREATE_EX一致，这就等同于你的ActiveX控件。同样，它也应该跟你的HTML页面中的OBJECT ID标签中的CLSID一致。
#include "comcat.h"#include "strsafe.h"#include "objsafe.h"// CLSID_SafeItem – 安全的ActiveX控件所必须的内容// ID的值跟xxxCtrl.cpp文件中的IMPLEMENT_OLECREATE_EX一致const CATID CLSID_SafeItem ={ 0x36299202, 0x9ef, 0x4abf,{ 0xad, 0xb9, 0x47, 0xc5, 0x99, 0xdb, 0xe7, 0x78}};// HRESULT CreateComponentCategory – 用于注册安全的ActiveX控件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; // 确认HKCR\Component Categories\{..catid...}键值被注册 CATEGORYINFO catinfo; catinfo.catid = catid; catinfo.lcid = 0x0409 ; // english size_t len; // 确认描述不是太长。// 只复制开始的127个字符。// StringCchLength的第二个参数表示被读入catDescription的最大字符数。 // 第三个参数表示字符串的长度 hr = StringCchLength(catDescription, STRSAFE_MAX_CCH, &len); if (SUCCEEDED(hr)) { if (len>127) { len = 127; } } else { // TODO: Write an error handler; } hr = StringCchCopy(catinfo.szDescription, len + 1, catDescription); // 添加字符串结束符. catinfo.szDescription[len + 1] = '\0'; hr = pcr->RegisterCategories(1, &catinfo); pcr->Release(); return hr;}// HRESULT RegisterCLSIDInCategory - 注册组件分类信息
// 注册组件分类信息HRESULT RegisterCLSIDInCategory(REFCLSID clsid, CATID catid){// 注册组件分类信息 ICatRegister *pcr = NULL ; HRESULT hr = S_OK ; hr = CoCreateInstance(CLSID_StdComponentCategoriesMgr, NULL, CLSCTX_INPROC_SERVER, IID_ICatRegister, (void**)&pcr); if (SUCCEEDED(hr)) { CATID rgcatid[1] ; rgcatid[0] = catid; hr = pcr->RegisterClassImplCategories(clsid, 1, rgcatid); } if (pcr != NULL) pcr->Release(); return hr;}// HRESULT UnRegisterCLSIDInCategoryHRESULT 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)) { CATID rgcatid[1] ; rgcatid[0] = catid; hr = pcr->UnRegisterClassImplCategories(clsid, 1, rgcatid); } if (pcr != NULL) pcr->Release(); return hr;} 2.修改DllRegisterServer函数:
STDAPI DllRegisterServer(void){ HRESULT hr; // HResult used by Safety Functions AFX_MANAGE_STATE(_afxModuleAddrThis); if (!AfxOleRegisterTypeLib(AfxGetInstanceHandle(), _tlid)) return ResultFromScode(SELFREG_E_TYPELIB); if (!COleObjectFactoryEx::UpdateRegistryAll(TRUE)) return ResultFromScode(SELFREG_E_CLASS); // 为初始化标记控件为安全控件 hr = CreateComponentCategory(CATID_SafeForInitializing, L"Controls safely initializable from persistent data!"); if (FAILED(hr)) return hr; hr = RegisterCLSIDInCategory(CLSID_SafeItem, CATID_SafeForInitializing); if (FAILED(hr)) return hr; // 为脚本标记控件为安全控件 hr = CreateComponentCategory(CATID_SafeForScripting, L"Controls safely scriptable!"); if (FAILED(hr)) return hr; hr = RegisterCLSIDInCategory(CLSID_SafeItem, CATID_SafeForScripting); if (FAILED(hr)) return hr; return NOERROR;} 3.修改 DllUnregisterServer函数：
STDAPI DllUnregisterServer(void){ HRESULT hr; // HResult used by Safety Functions AFX_MANAGE_STATE(_afxModuleAddrThis); if (!AfxOleUnregisterTypeLib(_tlid, _wVerMajor, _wVerMinor)) return ResultFromScode(SELFREG_E_TYPELIB); if (!COleObjectFactoryEx::UpdateRegistryAll(FALSE)) return ResultFromScode(SELFREG_E_CLASS); hr=UnRegisterCLSIDInCategory(CLSID_SafeItem, CATID_SafeForInitializing); if (FAILED(hr)) return hr; hr=UnRegisterCLSIDInCategory(CLSID_SafeItem, CATID_SafeForScripting); if (FAILED(hr)) return hr; return NOERROR;}