home *** CD-ROM | disk | FTP | other *** search
- /*
- * DKOALA2.CPP
- * Koala Object DLL Self-Registering Server Chapter 5
- *
- * Example object structured in a DLL server.
- *
- * Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
- *
- * Kraig Brockschmidt, Microsoft
- * Internet : kraigb@microsoft.com
- * Compuserve: >INTERNET:kraigb@microsoft.com
- */
-
-
- #define INITGUIDS
- #include "dkoala2.h"
-
-
- //Count number of objects and number of locks.
- ULONG g_cObj=0;
- ULONG g_cLock=0;
-
- HINSTANCE g_hInst=NULL;
-
-
- /*
- * LibMain(32)
- *
- * Purpose:
- * Entry point conditionally compiled for Win32 and Win16.
- * Provides the proper structure for each environment.
- */
-
- #ifdef WIN32
- BOOL WINAPI LibMain32(HINSTANCE hInstance, ULONG ulReason
- , LPVOID pvReserved)
- {
- if (DLL_PROCESS_DETACH==ulReason)
- {
- return TRUE;
- }
- else
- {
- if (DLL_PROCESS_ATTACH!=ulReason)
- return TRUE;
- }
-
- g_hInst=hInstance;
- return TRUE;
- }
- #else
- int PASCAL LibMain(HINSTANCE hInstance, WORD wDataSeg
- , WORD cbHeapSize, LPSTR lpCmdLine)
- {
- if (0!=cbHeapSize)
- UnlockData(0);
-
- g_hInst=hInstance;
- return (int)hInstance;
- }
- #endif
-
-
-
- /*
- * DllGetClassObject
- *
- * Purpose:
- * Provides an IClassFactory for a given CLSID that this DLL is
- * registered to support. This DLL is placed under the CLSID
- * in the registration database as the InProcServer.
- *
- * Parameters:
- * clsID REFCLSID that identifies the class factory
- * desired. Since this parameter is passed this
- * DLL can handle any number of objects simply
- * by returning different class factories here
- * for different CLSIDs.
- *
- * riid REFIID specifying the interface the caller wants
- * on the class object, usually IID_ClassFactory.
- *
- * ppv PPVOID in which to return the interface
- * pointer.
- *
- * Return Value:
- * HRESULT NOERROR on success, otherwise an error code.
- */
-
- STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, PPVOID ppv)
- {
- HRESULT hr;
- CKoalaClassFactory *pObj;
-
- if (CLSID_Koala!=rclsid)
- return ResultFromScode(E_FAIL);
-
- pObj=new CKoalaClassFactory();
-
- if (NULL==pObj)
- return ResultFromScode(E_OUTOFMEMORY);
-
- hr=pObj->QueryInterface(riid, ppv);
-
- if (FAILED(hr))
- delete pObj;
- else
- g_cObj++;
-
- return hr;
- }
-
-
-
-
-
- /*
- * DllCanUnloadNow
- *
- * Purpose:
- * Answers if the DLL can be freed, that is, if there are no
- * references to anything this DLL provides.
- *
- * Parameters:
- * None
- *
- * Return Value:
- * BOOL TRUE if nothing is using us, FALSE otherwise.
- */
-
- STDAPI DllCanUnloadNow(void)
- {
- SCODE sc;
-
- //Our answer is whether there are any object or locks
- sc=(0L==g_cObj && 0L==g_cLock) ? S_OK : S_FALSE;
- return ResultFromScode(sc);
- }
-
-
-
-
- /*
- * DllRegisterServer
- *
- * Purpose:
- * Instructs the server to create its own registry entries
- *
- * Parameters:
- * None
- *
- * Return Value:
- * HRESULT NOERROR if registration successful, error
- * otherwise.
- */
-
- STDAPI DllRegisterServer(void)
- {
- TCHAR szID[128];
- TCHAR szCLSID[128];
- TCHAR szModule[512];
-
- //Create some base key strings.
- StringFromGUID2(CLSID_Koala, szID, 128);
- lstrcpy(szCLSID, TEXT("CLSID\\"));
- lstrcat(szCLSID, szID);
-
- //Create ProgID keys
- SetKeyAndValue(TEXT("Koala1.0"), NULL
- , TEXT("Koala Object Chapter 5"));
- SetKeyAndValue(TEXT("Koala1.0"), TEXT("CLSID"), szID);
-
- //Create VersionIndependentProgID keys
- SetKeyAndValue(TEXT("Koala"), NULL
- , TEXT("Koala Object Chapter 5"));
- SetKeyAndValue(TEXT("Koala"), TEXT("CurVer")
- , TEXT("Koala1.0"));
- SetKeyAndValue(TEXT("Koala"), TEXT("CLSID"), szID);
-
- //Create entries under CLSID
- SetKeyAndValue(szCLSID, NULL, TEXT("Koala Object Chapter 5"));
- SetKeyAndValue(szCLSID, TEXT("ProgID"), TEXT("Koala1.0"));
- SetKeyAndValue(szCLSID, TEXT("VersionIndependentProgID")
- , TEXT("Koala"));
- SetKeyAndValue(szCLSID, TEXT("NotInsertable"), NULL);
-
- GetModuleFileName(g_hInst, szModule
- , sizeof(szModule)/sizeof(TCHAR));
-
- #ifdef WIN32
- SetKeyAndValue(szCLSID, TEXT("InprocServer32"), szModule);
- #else
- SetKeyAndValue(szCLSID, "InprocServer", szModule);
- #endif
-
- return NOERROR;
- }
-
-
-
- /*
- * DllRegisterServer
- *
- * Purpose:
- * Instructs the server to remove its own registry entries
- *
- * Parameters:
- * None
- *
- * Return Value:
- * HRESULT NOERROR if registration successful, error
- * otherwise.
- */
-
-
- STDAPI DllUnregisterServer(void)
- {
- TCHAR szID[128];
- TCHAR szCLSID[128];
- TCHAR szTemp[256];
-
- //Create some base key strings.
- StringFromGUID2(CLSID_Koala, szID, 128);
- lstrcpy(szCLSID, TEXT("CLSID\\"));
- lstrcat(szCLSID, szID);
-
- RegDeleteKey(HKEY_CLASSES_ROOT, TEXT("Koala\\CurVer"));
- RegDeleteKey(HKEY_CLASSES_ROOT, TEXT("Koala\\CLSID"));
- RegDeleteKey(HKEY_CLASSES_ROOT, TEXT("Koala"));
-
- RegDeleteKey(HKEY_CLASSES_ROOT, TEXT("Koala1.0\\CLSID"));
- RegDeleteKey(HKEY_CLASSES_ROOT, TEXT("Koala1.0"));
-
- wsprintf(szTemp, TEXT("%s\\%s"), szCLSID, TEXT("ProgID"));
- RegDeleteKey(HKEY_CLASSES_ROOT, szTemp);
-
- wsprintf(szTemp, TEXT("%s\\%s"), szCLSID, TEXT("VersionIndependentProgID"));
- RegDeleteKey(HKEY_CLASSES_ROOT, szTemp);
-
- wsprintf(szTemp, TEXT("%s\\%s"), szCLSID, TEXT("NotInsertable"));
- RegDeleteKey(HKEY_CLASSES_ROOT, szTemp);
-
- #ifdef WIN32
- wsprintf(szTemp, TEXT("%s\\%s"), szCLSID, TEXT("InprocServer32"));
- #else
- wsprintf(szTemp, "%s\\%s", szCLSID, "InprocServer");
- #endif
- RegDeleteKey(HKEY_CLASSES_ROOT, szTemp);
-
- RegDeleteKey(HKEY_CLASSES_ROOT, szCLSID);
- return NOERROR;
- }
-
-
-
- /*
- * SetKeyAndValue
- *
- * Purpose:
- * Private helper function for DllRegisterServer that creates
- * a key, sets a value, and closes that key.
- *
- * Parameters:
- * pszKey LPTSTR to the ame of the key
- * pszSubkey LPTSTR ro the name of a subkey
- * pszValue LPTSTR to the value to store
- *
- * Return Value:
- * BOOL TRUE if successful, FALSE otherwise.
- */
-
- BOOL SetKeyAndValue(LPTSTR pszKey, LPTSTR pszSubkey
- , LPTSTR pszValue)
- {
- HKEY hKey;
- TCHAR szKey[256];
-
- lstrcpy(szKey, pszKey);
-
- if (NULL!=pszSubkey)
- {
- lstrcat(szKey, TEXT("\\"));
- lstrcat(szKey, pszSubkey);
- }
-
- if (ERROR_SUCCESS!=RegCreateKeyEx(HKEY_CLASSES_ROOT
- , szKey, 0, NULL, REG_OPTION_NON_VOLATILE
- , KEY_ALL_ACCESS, NULL, &hKey, NULL))
- return FALSE;
-
- if (NULL!=pszValue)
- {
- RegSetValueEx(hKey, NULL, 0, REG_SZ, (BYTE *)pszValue
- , (lstrlen(pszValue)+1)*sizeof(TCHAR));
- }
-
- RegCloseKey(hKey);
- return TRUE;
- }
-
-
-
-
- /*
- * ObjectDestroyed
- *
- * Purpose:
- * Function for the Koala object to call when it gets destroyed.
- * Since we're in a DLL we only track the number of objects here,
- * letting DllCanUnloadNow take care of the rest.
- */
-
- void ObjectDestroyed(void)
- {
- g_cObj--;
- return;
- }
-
-
-
-
-
- /*
- * CKoalaClassFactory::CKoalaClassFactory
- * CKoalaClassFactory::~CKoalaClassFactory
- *
- * Constructor Parameters:
- * None
- */
-
- CKoalaClassFactory::CKoalaClassFactory(void)
- {
- m_cRef=0L;
- return;
- }
-
- CKoalaClassFactory::~CKoalaClassFactory(void)
- {
- return;
- }
-
-
-
-
- /*
- * CKoalaClassFactory::QueryInterface
- * CKoalaClassFactory::AddRef
- * CKoalaClassFactory::Release
- */
-
- STDMETHODIMP CKoalaClassFactory::QueryInterface(REFIID riid
- , PPVOID ppv)
- {
- *ppv=NULL;
-
- if (IID_IUnknown==riid || IID_IClassFactory==riid)
- *ppv=this;
-
- if (NULL!=*ppv)
- {
- ((LPUNKNOWN)*ppv)->AddRef();
- return NOERROR;
- }
-
- return ResultFromScode(E_NOINTERFACE);
- }
-
-
- STDMETHODIMP_(ULONG) CKoalaClassFactory::AddRef(void)
- {
- return ++m_cRef;
- }
-
-
- STDMETHODIMP_(ULONG) CKoalaClassFactory::Release(void)
- {
- if (0L!=--m_cRef)
- return m_cRef;
-
- delete this;
- ObjectDestroyed();
- return 0L;
- }
-
-
-
-
-
-
-
- /*
- * CKoalaClassFactory::CreateInstance
- *
- * Purpose:
- * Instantiates a Koala object returning an interface pointer.
- *
- * Parameters:
- * pUnkOuter LPUNKNOWN to the controlling IUnknown if we are
- * being used in an aggregation.
- * riid REFIID identifying the interface the caller
- * desires to have for the new object.
- * ppvObj PPVOID in which to store the desired
- * interface pointer for the new object.
- *
- * Return Value:
- * HRESULT NOERROR if successful, otherwise E_NOINTERFACE
- * if we cannot support the requested interface.
- */
-
- STDMETHODIMP CKoalaClassFactory::CreateInstance(LPUNKNOWN pUnkOuter
- , REFIID riid, PPVOID ppvObj)
- {
- PCKoala pObj;
- HRESULT hr;
-
- *ppvObj=NULL;
- hr=ResultFromScode(E_OUTOFMEMORY);
-
- //Verify that a controlling unknown asks for IUnknown
- if (NULL!=pUnkOuter && IID_IUnknown!=riid)
- return ResultFromScode(CLASS_E_NOAGGREGATION);
-
- //Create the object passing function to notify on destruction.
- pObj=new CKoala(pUnkOuter, ObjectDestroyed);
-
- if (NULL==pObj)
- return hr;
-
- if (pObj->Init())
- hr=pObj->QueryInterface(riid, ppvObj);
-
- //Kill the object if initial creation or Init failed.
- if (FAILED(hr))
- delete pObj;
- else
- g_cObj++;
-
- return hr;
- }
-
-
-
-
-
-
- /*
- * CKoalaClassFactory::LockServer
- *
- * Purpose:
- * Increments or decrements the lock count of the DLL. If the
- * lock count goes to zero and there are no objects, the DLL
- * is allowed to unload. See DllCanUnloadNow.
- *
- * Parameters:
- * fLock BOOL specifying whether to increment or
- * decrement the lock count.
- *
- * Return Value:
- * HRESULT NOERROR always.
- */
-
- STDMETHODIMP CKoalaClassFactory::LockServer(BOOL fLock)
- {
- if (fLock)
- g_cLock++;
- else
- g_cLock--;
-
- return NOERROR;
- }
-