如何在VB中实现ActiveX控件的IobjectSafety接口 -------------------------------------------------------------------------------- 总述 本文叙述了如何在VB中实现控件的IobjectSafety接口,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Iobject Safety接口是更好的方法。本言语包括了实现过程中所需的所有代码。 请注意,控件只有确确实实是安全的,才能被标识为“安全的”。本文并未论及如何确保 控件的安全性,这个问题请参阅Internet Client Software Development Kit (SDK)中的相关 文档 "Safe Initialization and Scripting for ActiveX Controls",它在Component Devel opment 栏目中。 相关信息: <此处略去了一段也许无关紧要的警告> 现在开始循序渐进地举例说明怎样创建一个简单的VB控件,以及怎样将它标识为脚本安全 和初始化安全。首先新建一个文件夹来存放在本例中所产生的文件。 从VB CD-ROM取得OLE 自动化类库的制作工具。将VB安装光盘中\Common\Tools\VB\Unsupp rt\Typlib\目录下所有内容一并拷贝到前面新建的项目文件夹中。 把下列内容拷贝到“记事本”中,然后保存到上述文件夹,文件名为Objsafe.odl: [ 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); } } 在命令行提示符下切换到项目文件夹,输入下列命令创建一个.tlb 文件: MKTYPLIB objsafe.odl /tlb objsafe.tlb 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 MsgB ox "Test" 。 打开菜单“工程->引用”,点“浏览”,找到刚刚建立的Objsafe.tlb,把它加入到引用中。 增加一个新module名为basSafeCtl,并在其中加入下列代码: 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 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。 打开控件代码窗口,在声明部分加入如下代码(如果有Option Explicit语句,当然要保证代 码放在其后): Implements IObjectSafety 把下面两个过程代码拷贝到控件代码中: 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 保存后,把工程编译成OCX文件。现在控件已经实现了IObjectSafety 接口。在.htm中加入这件控件试一试吧。
因为我的ActiveX控件用VB写的
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总述
本文叙述了如何在VB中实现控件的IobjectSafety接口,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Iobject
Safety接口是更好的方法。本言语包括了实现过程中所需的所有代码。
请注意,控件只有确确实实是安全的,才能被标识为“安全的”。本文并未论及如何确保
控件的安全性,这个问题请参阅Internet Client Software Development Kit (SDK)中的相关
文档 "Safe Initialization and Scripting for ActiveX Controls",它在Component Devel
opment 栏目中。 相关信息:
<此处略去了一段也许无关紧要的警告>
现在开始循序渐进地举例说明怎样创建一个简单的VB控件,以及怎样将它标识为脚本安全
和初始化安全。首先新建一个文件夹来存放在本例中所产生的文件。
从VB CD-ROM取得OLE 自动化类库的制作工具。将VB安装光盘中\Common\Tools\VB\Unsupp
rt\Typlib\目录下所有内容一并拷贝到前面新建的项目文件夹中。
把下列内容拷贝到“记事本”中,然后保存到上述文件夹,文件名为Objsafe.odl:
[
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);
}
}
在命令行提示符下切换到项目文件夹,输入下列命令创建一个.tlb 文件:
MKTYPLIB objsafe.odl /tlb objsafe.tlb
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 MsgB
ox "Test" 。
打开菜单“工程->引用”,点“浏览”,找到刚刚建立的Objsafe.tlb,把它加入到引用中。
增加一个新module名为basSafeCtl,并在其中加入下列代码: 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
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。
打开控件代码窗口,在声明部分加入如下代码(如果有Option Explicit语句,当然要保证代
码放在其后):
Implements IObjectSafety
把下面两个过程代码拷贝到控件代码中: 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
保存后,把工程编译成OCX文件。现在控件已经实现了IObjectSafety 接口。在.htm中加入这件控件试一试吧。