编写在浏览器中不弹出警告的ActiveX控件

　　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 UnRegisterCLSIDInCategory

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))
{
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;
}