如何在 Visual Basic 控件中实现 IObjectSafety

下面的步骤说明如何创建一个简单的 Visual Basic 控件并将其标记为可安全执行脚本和 $ 初始化。

创建一个新的文件夹，您可以在其中保存创建此示例中的所有文件。
从 Visual Basic 6.0 CD-ROM 中获取 OLE 自动化类型库生成器。若要执行此操作将所有四个文件从 \Common\Tools\VB\Unsupprt\Typlib\ 文件夹复制到您的项目文件夹中。注意：从 \VB5.0\Tools\Unsupprt\Typlib\ 可视 Basic 5.0 中的文件夹中复制所有文件。

将以下文本复制到记事本，，将文件保存为 Objsafe.odl 项目文件夹中：

      [
          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);
           }
       }

在命令提示符使用 CD <path> 将移动到项目文件夹，然后键入以下命令来生成.tlb 文件的命令：
MKTYPLIB objsafe.odl /tlb objsafe.tlb
从 Visual Basic 创建 ActiveX 控件项目。在属性列表中项目的名称改为 IObjSafety 和 DemoCtl 到控件的名称。将名为 cmdTest 在控件上的命令按钮。在该 cmdTest 的 Click 事件处理中将 MsgBox"测试"语句放。
在项目菜单上单击引用，浏览到并添加 Objsafe.tlb，您早先创建的。

将一个新的模块添加到您的项目与下面的代码并命名模块 basSafeCtl：

      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

从项目属性更改为 Sub Main 来执行该 Sub Main 上面的启动对象。使用 m_fSafeForScripting 和 m_fSafeForInitializing 变量指定的安全编写脚本和/或初始化变量的值。
打开您的控件的代码窗口。将下面的代码行添加到声明部分中，（右后选项显式或作为第一个）：
```
Implements IObjectSafety
					
```

将下面的两个过程复制到您的控件的代码：

      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,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_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

在文件菜单上将保存您的项目和文件。请从您的项目的 OCX 文件。您的控件现在实现 IObjectSafety 接口。若要其测试插入一个.htm 文件中的控件。

原文地址：https://www.jb51.cc/vb/258852.html

如何在 Visual Basic 控件中实现 IObjectSafety

相关推荐