步步学ACTIVEX网页控件开发---创建安全的ActiveX控件

http://tech.it168.com/a2009/0410/271/000000271815_4.shtml
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;

}