以标志该控件是脚本安全和初始化安全的。
VB控件默认的处理方式是在注册表中注册组件类来标识其安全性,
但实现IobjectSafety接口是更好的方法。
本文包括了实现过程中所需的所有代码。
1、将以下文本复制到记事本, 并作为 objsafe.odl 项目文件夹以保存文件:
[
uuid(C67830E0-D11D-11cf-BD80-00AA00575603),
helpstring("VB IObjectSafety Interface"),
version(1.0)
]
library IObjectSafetyTLB
{
importlib("stdole2.tlb");
[
uuid(CB5BDC81-93C1-11cf-8F20-00805F2CD064),
helpstring("IObjectSafety Interface"),
odl
]
interface IObjectSafety:IUnknown {
[helpstring("GetInterfaceSafetyOptions")]
HRESULT GetInterfaceSafetyOptions(
[in] long riid,
[in] long *pdwSupportedOptions,
[in] long *pdwEnabledOptions);
[helpstring("SetInterfaceSafetyOptions")]
HRESULT SetInterfaceSafetyOptions(
[in] long riid,
[in] long dwOptionsSetMask,
[in] long dwEnabledOptions);
}
}
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2、在命令提示符处, 使用 CD < 路径 > 命令移到项目文件夹, 然后键入以下命令以生成 .tlb 文件:
MKTYPLIB objsafe.odl /tlb objsafe.tlb
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3、在VB中新建一个ActiveX Control 项目。修改属性,把项目命名为IobjSafety,控件命名为DemoCtl。在控件上放置一个按钮,命名为cmdTest,在它的Click事件中加入一句代码 MsgBox "Test"
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4、在 项目 菜单上, 单击 引用 , 浏览并添加 Objsafe.tlb
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5、项目添加一个新模块并命名模块 basSafeCtl,添加一下代码
Option Explicit
Public Const IID_IDispatch = "{00020400-0000-0000-C000-000000000046}"
Public Const IID_IPersistStorage = _
"{0000010A-0000-0000-C000-000000000046}"
Public Const IID_IPersistStream = _
"{00000109-0000-0000-C000-000000000046}"
Public Const IID_IPersistPropertyBag = _
"{37D84F60-42CB-11CE-8135-00AA004BB851}"
Public Const INTERFACESAFE_FOR_UNTRUSTED_CALLER = &H1
Public Const INTERFACESAFE_FOR_UNTRUSTED_DATA = &H2
Public Const E_NOINTERFACE = &H80004002
Public Const E_FAIL = &H80004005
Public Const MAX_GUIDLEN = 40
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
(pDest As Any, pSource As Any, ByVal ByteLen As Long)
Public Declare Function StringFromGUID2 Lib "ole32.dll" (rguid As _
Any, ByVal lpstrClsId As Long, ByVal cbMax As Integer) As Long
Public Type udtGUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
End Type
Public m_fSafeForScripting As Boolean
Public m_fSafeForInitializing As Boolean
Sub Main()
m_fSafeForScripting = True
m_fSafeForInitializing = True
End Sub
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6、在工程属性中把启动对象改成Sub Main确保上述代码会被执行。m_fSafeForScripting 和m_fSafeForInitializing两件变量的值分别指定了脚本安全和初始化安全取值。
8、打开控件的代码窗口。 将下列行的代码添加到声明部分 (OptionExplicit 后):
Implements IObjectSafety
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9、将下面两个过程复制到控件代码:
Private Sub IObjectSafety_GetInterfaceSafetyOptions(ByVal riid As _
Long, pdwSupportedOptions As Long, pdwEnabledOptions As Long)
Dim Rc As Long
Dim rClsId As udtGUID
Dim IID As String
Dim bIID() As Byte
pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER Or _
INTERFACESAFE_FOR_UNTRUSTED_DATA
If (riid <> 0) Then
CopyMemory rClsId, ByVal riid, Len(rClsId)
bIID = String$(MAX_GUIDLEN, 0)
Rc = StringFromGUID2(rClsId, VarPtr(bIID(0)), MAX_GUIDLEN)
Rc = InStr(1, bIID, vbNullChar) - 1
IID = Left$(UCase(bIID), Rc)
Select Case IID
Case IID_IDispatch
pdwEnabledOptions = IIf(m_fSafeForScripting, _
INTERFACESAFE_FOR_UNTRUSTED_CALLER, 0)
Exit Sub
Case IID_IPersistStorage, IID_IPersistStream, _
IID_IPersistPropertyBag
pdwEnabledOptions = IIf(m_fSafeForInitializing, _
INTERFACESAFE_FOR_UNTRUSTED_DATA, 0)
Exit Sub
Case Else
Err.Raise E_NOINTERFACE
Exit Sub
End Select
End If
End Sub
Private Sub IObjectSafety_SetInterfaceSafetyOptions(ByVal riid As _
Long, ByVal dwOptionsSetMask As Long, ByVal dwEnabledOptions As Long)
Dim Rc As Long
Dim rClsId As udtGUID
Dim IID As String
Dim bIID() As Byte
If (riid <> 0) Then
CopyMemory rClsId, ByVal riid, Len(rClsId)
bIID = String$(MAX_GUIDLEN, 0)
Rc = StringFromGUID2(rClsId, VarPtr(bIID(0)), MAX_GUIDLEN)
Rc = InStr(1, bIID, vbNullChar) - 1
IID = Left$(UCase(bIID), Rc)
Select Case IID
Case IID_IDispatch
If ((dwEnabledOptions And dwOptionsSetMask) <> _
INTERFACESAFE_FOR_UNTRUSTED_CALLER) Then
Err.Raise E_FAIL
Exit Sub
Else
If Not m_fSafeForScripting Then
Err.Raise E_FAIL
End If
Exit Sub
End If
Case IID_IPersistStorage, IID_IPersistStream, _
IID_IPersistPropertyBag
If ((dwEnabledOptions And dwOptionsSetMask) <> _
INTERFACESAFE_FOR_UNTRUSTED_DATA) Then
Err.Raise E_FAIL
Exit Sub
Else
If Not m_fSafeForInitializing Then
Err.Raise E_FAIL
End If
Exit Sub
End If
Case Else
Err.Raise E_NOINTERFACE
Exit Sub
End Select
End If
End Sub
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10、在 文件 菜单上, 保存您的项目和文件。 生成 OCX 文件从项目。 现在您控件实现 IObjectSafety 接口。 要测试, 在一个 .htm 文件中插入控件。
相关连接:
http://topic.csdn.net/t/20050104/23/3699426.html
原理
IObjectSafety 是一个接口,它可将其功能显露给 Internet Explorer 的“设置脚本安全性”和“设置初始化安全性”安全特性。对具有支持未受托客户(或那些不能预料其特定功能的,或不能确保安全使用的客户)接口的对象,例如 脚本,应当实现 IObjectSafety 接口。该接口允许您指定对象的哪一部分需要保护而不被使用。