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456 lines
8.9 KiB
456 lines
8.9 KiB
/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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com.c
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Abstract:
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Implements the required code for a COM server. This module is specific to
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the COM interfaces exposed by osuninst.dll
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Author:
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Jim Schmidt (jimschm) 21-Feb-2001
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Revision History:
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<alias> <date> <comments>
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--*/
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#include "pch.h"
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#include "compguid.h"
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#include "com.h"
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#include "undop.h"
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//
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// Globals
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//
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INT g_DllObjects;
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INT g_DllLocks;
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//
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// Implementation
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//
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STDAPI
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DllGetClassObject (
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IN REFCLSID ClassId,
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IN REFIID InterfaceIdRef,
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OUT PVOID *InterfacePtr
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)
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/*++
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Routine Description:
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DllGetClassObject is the DLL-to-COM connection. It is exported from the DLL,
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so that COM can call it with CoGetClassObject. COM is the only one who calls
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this entry point, and finds the dll through registration of the CLSID in
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HKCR.
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Arguments:
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ClassId - Specifies the class factory desired. This arg allows a single DLL
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to implement multiple interfaces.
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InterfaceIdRef - Specifies the interface the caller wants on the class
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object, usually IID_ClassFactory.
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InterfacePtr - Receives the interface pointer, or NULL if an error occurs.
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Return Value:
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E_INVALIDARG - The caller specified an invalid argument
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E_OUTOFMEMORY - Failed to alloc memory for interface
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E_UNEXPECTED - Some random problem
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S_OK - Success
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CLASS_E_CLASSNOTAVAILABLE - Requested class is not supported
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--*/
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{
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BOOL result = FALSE;
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HRESULT hr = S_OK;
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PUNINSTALLCLASSFACTORY uninstallClassFactory = NULL;
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__try {
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DeferredInit();
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//
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// Initialize out arg
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//
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__try {
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*InterfacePtr = NULL;
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}
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__except(1) {
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hr = E_INVALIDARG;
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}
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if (hr != S_OK) {
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DEBUGMSG ((DBG_ERROR, __FUNCTION__ ": Invalid InterfacePtr arg"));
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__leave;
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}
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//
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// Is this a request for a disk cleanup class? If not, fail with
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// CLASS_E_CLASSNOTAVAILABLE.
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//
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if (!IsEqualCLSID (ClassId, CLSID_UninstallCleaner)) {
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DEBUGMSG ((DBG_ERROR, "Uninstall: Requested class not supported"));
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hr = CLASS_E_CLASSNOTAVAILABLE;
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__leave;
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}
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//
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// Return our IClassFactory for making CCompShellExt objects
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//
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uninstallClassFactory = new CUninstallClassFactory ();
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if (!uninstallClassFactory) {
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hr = E_OUTOFMEMORY;
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__leave;
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}
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//
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// Test if our class factory support the requested interface
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//
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hr = uninstallClassFactory->QueryInterface (InterfaceIdRef, InterfacePtr);
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}
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__finally {
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if (FAILED (hr) && uninstallClassFactory) {
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//
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// failure -- clean up object
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//
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delete uninstallClassFactory;
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}
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}
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return hr;
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}
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STDAPI
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DllCanUnloadNow (
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VOID
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)
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/*++
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Routine Description:
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Indicatates if this DLL is in use or not. If it is not in use, COM will
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unload it.
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Arguments:
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None.
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Return Value:
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S_OK - The DLL is not in use
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S_FALSE - The DLL is used at least once
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--*/
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{
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if (g_DllObjects || g_DllLocks) {
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return S_FALSE;
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}
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return S_OK;
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}
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/*++
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Routine Descriptions:
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This constructor is a generic class factory that supports multiple object
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types. Upon creation, the object interface pointer ref count is set to zero,
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and the global number of objects for the dll is incremented.
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The destructor simply decrements the DLL object count.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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CUninstallClassFactory::CUninstallClassFactory (
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VOID
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)
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{
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//
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// -Initialize the interface pointer count
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// -Increment the DLL's global count of objects
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//
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_References = 0;
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g_DllObjects++;
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}
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CUninstallClassFactory::~CUninstallClassFactory (
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VOID
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)
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{
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g_DllObjects--;
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}
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STDMETHODIMP
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CUninstallClassFactory::QueryInterface (
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IN REFIID InterfaceIdRef,
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OUT PVOID *InterfacePtr
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)
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{
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HRESULT hr = S_OK;
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DEBUGMSG ((DBG_VERBOSE, __FUNCTION__ ": Entering"));
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__try {
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//
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// Initialize out arg
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//
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__try {
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*InterfacePtr = NULL;
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}
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__except(1) {
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hr = E_INVALIDARG;
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}
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if (hr != S_OK) {
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DEBUGMSG ((DBG_ERROR, __FUNCTION__ ": Invalid InterfacePtr arg"));
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__leave;
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}
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//
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// Test for the supported interface
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//
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if (IsEqualIID (InterfaceIdRef, IID_IUnknown)) {
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DEBUGMSG ((DBG_VERBOSE, "Caller requested IUnknown"));
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*InterfacePtr = (LPUNKNOWN)(LPCLASSFACTORY) this;
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AddRef();
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__leave;
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}
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if (IsEqualIID (InterfaceIdRef, IID_IClassFactory)) {
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DEBUGMSG ((DBG_VERBOSE, "Caller requested IClassFactory"));
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*InterfacePtr = (LPCLASSFACTORY)this;
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AddRef();
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__leave;
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}
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DEBUGMSG ((DBG_WARNING, "Caller requested unknown interface"));
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hr = E_NOINTERFACE;
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}
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__finally {
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}
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DEBUGMSG ((DBG_VERBOSE, __FUNCTION__ ": Leaving"));
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return hr;
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}
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/*++
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Routine Description:
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AddRef is the standard IUnknown member function that increments the object
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reference count.
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Release is the standard IUnknown member function that decrements the object
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reference count.
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Arguments:
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None.
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Return Value:
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The number of interface references.
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--*/
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STDMETHODIMP_(ULONG)
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CUninstallClassFactory::AddRef (
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VOID
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)
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{
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return ++_References;
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}
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STDMETHODIMP_(ULONG)
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CUninstallClassFactory::Release (
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VOID
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)
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{
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if (!_References) {
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DEBUGMSG ((DBG_ERROR, "Can't release because there are no references"));
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} else {
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_References--;
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if (!_References) {
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delete this;
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return 0;
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}
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}
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return _References;
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}
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STDMETHODIMP
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CUninstallClassFactory::CreateInstance (
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IN LPUNKNOWN IUnknownOuterInterfacePtr,
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IN REFIID InterfaceIdRef,
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OUT PVOID * InterfacePtr
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)
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/*++
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Routine Description:
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CreateInstance establishes an object.
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Arguments:
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IUnknownOuterInterfacePtr - Specifies the IUnknown interface that
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is the outer layer in objects derrived from us. This happens only when
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additional objects inherit out interfaces.
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InterfaceIdRef - Specifies the interface that the caller wants to
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instantiate
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InterfacePtr - Receives the pointer to the interface, or NULL on an error
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Return Value:
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S_OK - The object was created and its reference is returned in InterfacePtr
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E_OUTOFMEMORY - Not enough memory available to instantiate the object
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E_INVALIDARG - The caller specified an invalid InterfacePtr arg
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E_UNEXPECTED - Some random error condition was encountered
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E_NOINTERFACE - InterfaceIdRef is not supported
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--*/
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{
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HRESULT hr = S_OK;
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PUNINSTALLDISKCLEANER uninstallDiskCleaner = NULL;
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__try {
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//
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// Initialize out arg
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//
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__try {
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*InterfacePtr = NULL;
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}
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__except(1) {
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hr = E_INVALIDARG;
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}
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if (hr != S_OK) {
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DEBUGMSG ((DBG_ERROR, __FUNCTION__ ": Invalid InterfacePtr arg"));
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__leave;
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}
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//
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// Shell extensions typically don't support aggregation (inheritance)
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//
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if (IUnknownOuterInterfacePtr) {
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hr = CLASS_E_NOAGGREGATION;
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__leave;
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}
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//
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// Create the disk cleaner object
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//
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if (IsEqualIID (InterfaceIdRef, IID_IEmptyVolumeCache)) {
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DEBUGMSG ((DBG_VERBOSE, __FUNCTION__ ": Creating CUninstallDiskCleaner"));
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uninstallDiskCleaner = new CUninstallDiskCleaner();
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if (!uninstallDiskCleaner) {
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hr = E_OUTOFMEMORY;
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__leave;
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}
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hr = uninstallDiskCleaner->QueryInterface (InterfaceIdRef, InterfacePtr);
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__leave;
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}
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DEBUGMSG ((DBG_ERROR, __FUNCTION__ ": Unknown InterfaceIdRef"));
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hr = E_NOINTERFACE;
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}
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__finally {
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if (FAILED(hr)) {
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if (uninstallDiskCleaner) {
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delete uninstallDiskCleaner;
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}
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}
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}
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return hr;
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}
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STDMETHODIMP
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CUninstallClassFactory::LockServer (
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IN BOOL Lock
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)
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/*++
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Routine Description:
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LockServer is the standard IUnknown interface that is used to keep a server
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in memory. Its implementation tracks the lock count in a global.
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Arguments:
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Lock - Specifies TRUE to increment the loc count, or FALSE to decrement it.
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Return Value:
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S_OK - Server was locked (or unlocked)
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E_FAIL - No locks exist/can't unlock
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--*/
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{
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HRESULT hr = S_OK;
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if (Lock) {
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g_DllLocks++;
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} else {
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if (g_DllLocks) {
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g_DllLocks--;
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} else {
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DEBUGMSG ((DBG_ERROR, __FUNCTION__ ": Attempt to unlock when no locks exist"));
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hr = E_FAIL;
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}
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}
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return hr;
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}
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