ADVANCED VISUAL BASIC 6 in Java

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ADVANCED VISUAL BASIC 6
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you can set up an error trap for the API call, If a file error occurs, call LoadUbrary with a full path to the DLL, then the VB-declared API, and then Freeiibrary The API call succeeds on subsequent calls because VB doesn't let go of a library once it loads it with a Declare call You don't have this luxury with typelib-defined function declarations, all of which are resolved when the process is loaded You should also avoid locking yourself into a specific installation directory by not hard-coding any paths into your Declare statements These functions load a DLL and retrieve a class factory, and then test to see if the DLL can be unloaded This code (which you'll find in COMDllLoaderBas) uses FunctionDelegatorBas (discussed in 11) to call the DIIGetClassObject and DIICanUnloadNow function pointers
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'Requires a reference to ObjCreateolb and VBoostTypes6olb 'FunctionDelegatorBas must also be loaded in the project Private m_fInit As Boolean Public IID_IClassFactory As IID Public IID_IUnknown As IID Private m_FDDllGetClassObject As FunctionDelegator Private m_pCaIIDllGetClassObject As ICallDllGetClassObject Private m_FDDllCanUnloadNow As FunctionDelegator Private m_pCaIIDllCanUnloadNow As ICallDllCanUnloadNow Private Sub Init() IID_IClassFactory = IIDFromString(strIID_IClassFactory) IID_IUnknown = IIDFromString(strIID_IUnknown) Set m_pCaIIDllGetClassObject = _ InitDelegator(m_FDDllGetClassObject) Set m_pCaIIDllCanUnloadNow = _ InitDelegator (m_FDDHCanUnloadNow) m_fInit = True End Sub Public Function GetDllClassObject(ByVal DllPath As String, _ CLSID As CLSID, hModDll As HINSTANCE) As IClassFactory If Not m_fInit Then Init If hModDll = 0 Then hModDll = LoadLibraryEx( _
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DllPath, 0, LOAD_WITH_ALTERED_SEARCH_PATH) If hModDll = 0 Then ErrRaise &H80070000 + ErrLastDllError End If End If m_FDDllGetClassObjectpfn = GetProcAddress( _ hModDLL, "DllGetClassObject") If m_FDDLLGetClassObjectpfn = 0 Then ErrRaise &H80070000 + ErrLastDllError End If 'The function declaration specifies an HRESULT return 'value, so this can raise a standard error Set GetDllClassObject = m_pCaIIDllGetClassObjectCall( _ CLSID, IID_IClassFactory) End Function Public Sub TestUnloadDll(hModDll As HINSTANCE) If Not m_fInit Then Init If hModDll Then m_FDDllCanUnloadNowpfn = GetProcAddress ( _ hModDll, "DllCanUnloadNow") If m_FDDllCanUnloadNowpfn = 0 Then ErrRaise &H80070000 + ErrLastDllError End If If m_pCaIIDHCanUnloadNowCall = 0 Then FreeLibrary hModDll hModDll =0 End If End If End Sub
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To load and unload DLLs, you must determine a CLSID of an object in the DLL, the DLL's location, and keep track of its module handle after you load it The CLSID is a moving target if you don't set the DLL's compatibility level to the project or binary level There are several ways to determine the CLSID You can use a low-level type library browser (such as OleViewExe), the TLI (TypeLib Information) objects included with VB, or a utility called DumpClassDataExe included with the book DumpClassData generates a CLSID constant for each creatable class in a type library and a runtime license key for licensed objects in
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ADVANCED VISUAL BASIC 6
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a DLL or OCX Run DumpClassData by specifying a file on the command line or by selecting one in a dialog In either case, the utility generates clipboard data that looks something like this 'Target control Private Const strCLSID_Target As String = _ "{C33A1760-A296-IID3-BBF5-D41203C10000}" Private Const RTLic_Target As String = "mkjmmmrlhmknmo" Once you have obtained the CLSID, you can use this calling code to load and unload the DLL This code loads from a single DLL, and doesn't cache the class factory You can modify the code to track multiple DLLs or cache the class factory Const strDllObjectCLSID As String = _ "{C33A1760-A296-IID3-BBF5-D41203C10000}" Dim CLSID_DllObject As CLSID Dim m_hModMyDll As Long Sub CreateMyDllObject(RelPath As String) As MyDllObject Dim pCF As IClassFactory If m_hModMyDll = 0 Then 'Load or reload the DLL CLSID_DllObject = GUIDFromString(strDllObjectCLSID) Set pCF = GetDLLClassObject(AppPath & "\" & _ RelPath, CLSID_DllObject, m_hModMyDll) Else Set pCF = GetDllClassObject(vbNullString, _ CLSID_DllObject, m_hModMyDll) End If 'Create the instance IID_IUnknown is declared in 'COMDllLoaderBas Set CreateMyDllObject = _ pCFCreateInstance(Nothing, IID_IUnknown) End Sub Sub UnloadDll() TestUnloadDll m_hModMyDll End Sub
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