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want to load The only property you have to set is the WindowLess property, which should match the control you're trying to load Your project must have a VBoost object available, a reference to ObjCreateolb, and the OcxLoaderBas, COMDlILoaderBas, and FunctionDelegatorBas 'wrap Private Const strCLSID_Target As String = _ "{662AE532-AFF5-IID3-BC07-D41203C10000}" Private Const strTargetOCX As String = "Targetocx" Private m_OcxLoadData As OcxLoadData Private Sub UserControl_Initialize() LoadWrappedOcx m_OcxLoadData, Me, _ strTargetOcx, GUIDFromString(strCLSID_Target) End Sub Private Sub UserControl_Terminate() UnloadWrappedOcx m_OcxLoadData End Sub
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'OcxLoaderBas 'External dependencies: 'COMDllLoaderBas 'FunctionDelegatorBas Public Type OcxLoadData hInstDll As Long Hook As UnknownHook End Type Public Type OcxTargetData TargetOcx As String CLSID As CLSID RTLicenseKey As String fTargetAbsolute As Boolean End Type Public g_OcxTargetData As OcxTargetData Private Type OcxHookAggData AggData(l) As AggregateData
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pIIDs(0) As IID End Type 'Load an OCX into the Wrapper object based on a relative 'path This should be called from the UserControl_Initialize 'event of the wrapper UserControl class Path to the OCX relative to the application, unless fTargetAbsolute is true, in which ' case this is an absolute path 'CLSID_Target: CLSID supported by the wrapped OCX 'RTLicenseKey: The key to create a control that doesn't ' have a registered license key Can be ' obtained from IClassFactory2RequestLicKey ' using the GetRTLicKey utility on a machine where the control is fully licensed 'fTargetAbsolute: An optional flag indicating that the ' TargetOCX argument is an absolute, not a relative, path Public Sub LoadWrappedOcx( _ LoadData As OcxLoadData, _ ByVal Wrapper As IUnknown, _ TargetOcx As String, _ CLSID_Target As CLSID, _ Optional RTLicenseKey As String, _ Optional ByVal fTargetAbsolute As Boolean = False) Dim HookData As OcxHookAggData Dim pCF As IClassFactory Dim pCF2 As IClassFactory2 'If this is used at design time, then Sub Main may 'not have run, so the VBoost object has not been 'created If VBoost Is Nothing Then InitVBoost 'Use the helper function to load the OCX If fTargetAbsolute Then Set pCF = GetDllClassObject(TargetOcx, _ CLSID_Target, LoadDatahInstDll) Else Set pCF = GetDllClassObject(AppPath & "\" & TargetOcx, _
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'TargetOcx:
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CLSID_Target, LoadDatahInstDll) End If 'See about licensing If Len(RTLicenseKey) Then Set pCF2 = pCF With pCF2GetLicInfo If fLicVerified Then 'pCFCreateInstance will succeed Set pCF2 = Nothing Else If 0 = fRuntimeKeyAvail Then 'Can load only a licensed control TestUnloadDll LoadDatahInstDll Exit Sub End If End If End With End If 'Aggregate the created object with priority before the 'wrapping object The adNoDelegator removes the 'per-interface overhead of the aggregator, but breaks COM 'identity with the wrapping object In practice, we don't 'really care much about the wrapping object, and there are 'a substantial amount of interfaces that need to be 'wrapped with a custom control, so we use adNoDelegator With HookDataAggData(0) Flags = adIgnoreIIDs Or adBeforeHookedUnknown _ Or adNoDelegator If pCF2 Is Nothing Then Set pObject = pCFCreateInstance( _ Nothing, IID_IUnknown) Else Set pObject = pCF2CreateInstanceLic( _ Nothing, Nothing, IID_IUnknown, RTLicenseKey) End If End With 'Block IQuickActivate With HookDataAggData(l)
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HookDatapIIDs(0) = IIDFromString( _ strIID_IQuickActivate) FirstIID = 0 Flags = adBlockIIDs End With VBoostAggregateUnknown _ Wrapper, HookDataAggData, HookDatapIIDs, LoadDataHook End Sub 'Call LoadWrappedOcx using the global data Public Sub LoadWrappedOcxFromGlobalTargetData( _ LoadData As OcxLoadData, ByVal Wrapper As IUnknown) With g_OcxTargetData LoadWrappedOcx LoadData, Wrapper, _ TargetOcx, CLSID, RTLicenseKey, fTargetAbsolute End With End Sub 'Unload the OCX file This should be called from the 'UserControl_Terminate event of the wrapper control Public Sub UnloadWrappedOcx(LoadData As OcxLoadData) 'Unhook to release all references on the wrapped object Set LoadDataHook = Nothing 'Let go of the OCX file if no one else is using it TestUnloadDll LoadDatahInstDll End Sub
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ControlsAdd and Dynamic Controls The sample code shown above uses one UserControl file per wrapped control and hard coded class information However, this is not a requirement for using the OCX wrapping code The only requirement is that the information for loading the class factory be available in the UserControl_Initialize Since VB doesn't let you pass parameters to the Initialize event, you need to either hard code the values or read them from global variables If you load controls onto your form at design-time, you want to use the private values If you want to go totally dynamic and add your controls with ControlsAdd, you can use a single
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