步步学ACTIVEX网页控件开发C++(3)

创建安全的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


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;

 

 

原文:http://blog.sina.com.cn/s/blog_561a69f10100gas6.html