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步步学ACTIVEX网页控件开发:创建安全的ActiveX控件

  【IT168 专稿】

  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。

  第一篇:步步学ACTIVEX网页控件开发:创建控件

  第二篇:步步学ACTIVEX网页控件开发:添加对GIF的支持

  第三篇:步步学ACTIVEX网页控件开发:为控件创建网页

  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;
}
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