Fornitura di dati a WMI scrivendo un provider
Un provider WMI crea un gruppo di classi, istanze ed eventi supportati per passare i dati a WMI. A sua volta, un'applicazione di gestione o uno script può chiamare i metodi del provider per modificare i dati forniti dal provider.
Il diagramma seguente illustra la relazione tra un provider associato a WMI e all'applicazione.
La procedura seguente descrive come creare un provider semplice che supporta un set di istanze. Il provider descritto qui è registrato per l'esecuzione all'interno del processo WMI. In alcuni casi, usare un provider disaccoppiato che viene eseguito in un processo diverso. Per altre informazioni sui modelli di hosting del provider, vedere Hosting e sicurezza del provider. I passaggi 1 e 2 nella procedura seguente differiscono per i provider disaccoppiati, ma in altri termini usano le stesse interfacce dei provider in-process. Per altre informazioni, vedere Incorporando un provider in un'applicazione.
Per creare un provider di istanze
Creare un'istanza di una classe __Win32Provider con codice MOF (Managed Object Format), fornendo il nome e CLSID del provider. Per altre informazioni, vedere Progettazione di classi MOF (Managed Object Format).
Nell'esempio di codice seguente viene illustrato come creare un'istanza di una classe __Win32Provider .
Instance of __Win32Provider as $P // $P is an alias { // Name that describes your provider Name = "InstProvSamp" ; ClsId = "{22CB8761-914A-11cf-B705-00AA0062CBB7}" ; } ;Nota
Per assicurarsi che tutte le definizioni di classe WMI per gli oggetti gestiti vengano ripristinate nel repository WMI se WMI ha un errore e viene riavviato, usare l'istruzione di preprocessore dell'istruzione #pragma autorecover nel file MOF.
Per altre informazioni, vedere Creazione di un'istanza e registrazione di un provider di istanze.
Creare un'istanza della classe __InstanceProviderRegistration che descrive le funzionalità del provider di istanze.
Nell'esempio di codice seguente viene illustrato come creare un'istanza della classe __InstanceProviderRegistration .
instance of __InstanceProviderRegistration { Provider = $P; // Alias to the __Win32Provider SupportsPut = FALSE; // Does not support the Put method SupportsGet = TRUE; // Supports the Get method SupportsDelete = FALSE; // Does not support the Delete method SupportsEnumeration = TRUE; // Supports enumeration. };Per altre informazioni sulle proprietà in questa sezione del codice MOF, vedere __InstanceProviderRegistration e __ObjectProviderRegistration.
Per altre informazioni, vedere Registrazione di un provider di istanze.
Usare il codice MOF per creare la classe dinamica per cui il provider fornisce istanze.
Una classe dinamica è una classe le cui istanze ricevono aggiornamenti da un provider. Questi aggiornamenti possono essere regolari o collegati a modifiche sporadiche negli oggetti rappresentati dalle istanze. È possibile visualizzare le modifiche alle istanze della classe dinamica tramite l'applicazione di gestione o il browser oggetti WMI.
Nell'esempio di codice seguente viene descritta una classe dinamica supportata dal provider "InstProvSamp".
[dynamic, provider("InstProvSamp"), // uses the InstProvSamp Provider ClassContext("whatever!")] // information is dynamically // supported by the provider class InstProvSamp { [key] // MyKey uniquely identifies this class String MyKey="HELLO"; // InstProvSamp dynamically updates MyValue [PropertyContext("Name")] uint32 MyValue; };Registrare le classi con WMI tramite il compilatore MOF.
Dal prompt dei comandi nella directory del provider digitare quanto segue per registrare il codice MOF di esempio con WMI.
mofcompinstprov.mof
Per altre informazioni, vedere Compilazione di file MOF.
Definire un oggetto COM per contenere il provider. Il codice di esempio per questo passaggio si trova in un esempio completo alla fine di questo argomento.
Come per qualsiasi oggetto COM, è necessario implementare un costruttore e un deconstructor, nonché i metodi QueryInterface, AddRef e Release .
Implementare il metodo IWbemProviderInit::Initialize nell'oggetto COM.
Lo scopo principale di Inizializzare in questo esempio consiste nell'impostare il membro m_pNamespace sullo spazio dei nomi corrente. Per altre informazioni sugli spazi dei nomi, vedere Creazione di gerarchie all'interno di WMI.
Un sink viene passato tramite il parametro pInitSink nel metodo IWbemProviderInit::Initialize per specificare che il provider ha inizializzato correttamente. Per altre informazioni sui sink, vedere IWbemObjectSink e Chiamata di un metodo.
Implementare il metodo IWbemServices::CreateInstanceEnumAsync all'interno dell'oggetto COM (anche se è possibile implementare un'ampia gamma di interfacce IWbemServices , l'esempio alla fine di questo argomento implementa solo CreateInstanceEnumAsync). In particolare, CreateInstanceEnumAsync restituisce istanze di oggetti specificati in WMI.
Implementare il metodo GetObjectAsync all'interno dell'oggetto COM.
Nell'esempio alla fine di questo argomento GetObjectAsync controlla i parametri nell'oggetto gestito, recupera l'oggetto specificato, esegue il controllo degli errori e restituisce i codici appropriati al sink.
Registrare il provider come oggetto COM usando RegSvr32.
Dal prompt dei comandi nella directory del provider digitare quanto segue:
regsvr32InstProv.dll
Il provider è ora completo. A questo punto, è necessario poter accedere alle istanze della classe InstProvSamp dall'interno di WMI.
Nell'esempio di codice seguente viene creato un oggetto COM per contenere il provider, come descritto nel passaggio 5 precedente. L'esempio completo contiene codice dal file di intestazione denominato Sample.h e file di origine denominati Instprov.cpp, Utils.cpp, Classfac.cpp e Maindll.cpp.
//*******************************************************************
// sample.h
// WMI Instance provider sample code
//
// Copyright (C) Microsoft. All Rights Reserved.
//
//*******************************************************************
#ifndef _sample_H_
#define _sample_H_
#include <wbemprov.h>
#pragma comment(lib, "wbemuuid.lib")
typedef LPVOID * PPVOID;
// Provider interfaces are provided by objects of this class
class CInstPro : public IWbemServices, public IWbemProviderInit
{
protected:
ULONG m_cRef; //Object reference count
IWbemServices* m_pNamespace;
public:
CInstPro(BSTR ObjectPath = NULL, BSTR User = NULL, BSTR Password = NULL, IWbemContext * pCtx=NULL);
~CInstPro(void);
//Non-delegating object IUnknown
STDMETHODIMP QueryInterface(REFIID, PPVOID);
STDMETHODIMP_(ULONG) AddRef(void);
STDMETHODIMP_(ULONG) Release(void);
//IWbemProviderInit
HRESULT STDMETHODCALLTYPE Initialize(
/* [in] */ LPWSTR pszUser,
/* [in] */ LONG lFlags,
/* [in] */ LPWSTR pszNamespace,
/* [in] */ LPWSTR pszLocale,
/* [in] */ IWbemServices *pNamespace,
/* [in] */ IWbemContext *pCtx,
/* [in] */ IWbemProviderInitSink *pInitSink
);
SCODE GetByPath( BSTR Path,
IWbemClassObject FAR* FAR* pObj,
IWbemContext *pCtx);
//IWbemServices
HRESULT STDMETHODCALLTYPE OpenNamespace(
/* [in] */ const BSTR Namespace,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [unique][in][out] */ IWbemServices __RPC_FAR *__RPC_FAR *ppWorkingNamespace,
/* [unique][in][out] */ IWbemCallResult __RPC_FAR *__RPC_FAR *ppResult)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE CancelAsyncCall(
/* [in] */ IWbemObjectSink __RPC_FAR *pSink)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE QueryObjectSink(
/* [in] */ long lFlags,
/* [out] */ IWbemObjectSink __RPC_FAR *__RPC_FAR *ppResponseHandler)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE GetObject(
/* [in] */ const BSTR ObjectPath,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [unique][in][out] */ IWbemClassObject __RPC_FAR *__RPC_FAR *ppObject,
/* [unique][in][out] */ IWbemCallResult __RPC_FAR *__RPC_FAR *ppCallResult)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE GetObjectAsync(
/* [in] */ const BSTR ObjectPath,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [in] */ IWbemObjectSink __RPC_FAR *pResponseHandler);
HRESULT STDMETHODCALLTYPE PutClass(
/* [in] */ IWbemClassObject __RPC_FAR *pObject,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [unique][in][out] */ IWbemCallResult __RPC_FAR *__RPC_FAR *ppCallResult)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE PutClassAsync(
/* [in] */ IWbemClassObject __RPC_FAR *pObject,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [in] */ IWbemObjectSink __RPC_FAR *pResponseHandler)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE DeleteClass(
/* [in] */ const BSTR Class,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [unique][in][out] */ IWbemCallResult __RPC_FAR *__RPC_FAR *ppCallResult)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE DeleteClassAsync(
/* [in] */ const BSTR Class,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [in] */ IWbemObjectSink __RPC_FAR *pResponseHandler)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE CreateClassEnum(
/* [in] */ const BSTR Superclass,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [out] */
IEnumWbemClassObject __RPC_FAR *__RPC_FAR *ppEnum)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE CreateClassEnumAsync(
/* [in] */ const BSTR Superclass,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [in] */ IWbemObjectSink __RPC_FAR *pResponseHandler)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE PutInstance(
/* [in] */ IWbemClassObject __RPC_FAR *pInst,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [unique][in][out] */ IWbemCallResult __RPC_FAR *__RPC_FAR *ppCallResult)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE PutInstanceAsync(
/* [in] */ IWbemClassObject __RPC_FAR *pInst,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [in] */ IWbemObjectSink __RPC_FAR *pResponseHandler)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE DeleteInstance(
/* [in] */ const BSTR ObjectPath,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [unique][in][out] */ IWbemCallResult __RPC_FAR *__RPC_FAR *ppCallResult)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE DeleteInstanceAsync(
/* [in] */ const BSTR ObjectPath,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [in] */ IWbemObjectSink __RPC_FAR *pResponseHandler)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE CreateInstanceEnum(
/* [in] */ const BSTR Class,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [out] */ IEnumWbemClassObject __RPC_FAR *__RPC_FAR *ppEnum)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE CreateInstanceEnumAsync(
/* [in] */ const BSTR Class,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [in] */ IWbemObjectSink __RPC_FAR *pResponseHandler);
HRESULT STDMETHODCALLTYPE ExecQuery(
/* [in] */ const BSTR QueryLanguage,
/* [in] */ const BSTR Query,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [out] */ IEnumWbemClassObject __RPC_FAR *__RPC_FAR *ppEnum)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE ExecQueryAsync(
/* [in] */ const BSTR QueryLanguage,
/* [in] */ const BSTR Query,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [in] */ IWbemObjectSink __RPC_FAR *pResponseHandler)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE ExecNotificationQuery(
/* [in] */ const BSTR QueryLanguage,
/* [in] */ const BSTR Query,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [out] */ IEnumWbemClassObject __RPC_FAR *__RPC_FAR *ppEnum)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE ExecNotificationQueryAsync(
/* [in] */ const BSTR QueryLanguage,
/* [in] */ const BSTR Query,
/* [in] */ long lFlags,
/* [in] */ IWbemContext __RPC_FAR *pCtx,
/* [in] */ IWbemObjectSink __RPC_FAR *pResponseHandler)
{return WBEM_E_NOT_SUPPORTED;};
HRESULT STDMETHODCALLTYPE ExecMethod( const BSTR,
const BSTR,
long,
IWbemContext*,
IWbemClassObject*,
IWbemClassObject**,
IWbemCallResult**)
{return WBEM_E_NOT_SUPPORTED;}
HRESULT STDMETHODCALLTYPE ExecMethodAsync( const BSTR,
const BSTR,
long,
IWbemContext*,
IWbemClassObject*,
IWbemObjectSink*)
{return WBEM_E_NOT_SUPPORTED;}
};
typedef CInstPro *PCInstPro;
// This class is the class factory for CInstPro objects.
class CProvFactory : public IClassFactory
{
protected:
ULONG m_cRef;
public:
CProvFactory(void);
~CProvFactory(void);
//IUnknown members
STDMETHODIMP QueryInterface(REFIID, PPVOID);
STDMETHODIMP_(ULONG) AddRef(void);
STDMETHODIMP_(ULONG) Release(void);
//IClassFactory members
STDMETHODIMP CreateInstance(LPUNKNOWN, REFIID, PPVOID);
STDMETHODIMP LockServer(BOOL);
};
typedef CProvFactory *PCProvFactory;
// These variables keep track of
// when the module can be unloaded
extern long g_cObj;
extern long g_cLock;
// General purpose utilities.
DWORD GetCurrentImpersonationLevel ();
SCODE CreateInst( IWbemServices * pNamespace,
LPWSTR pKey, long lVal,
IWbemClassObject ** pNewInst,
WCHAR * pwcClassName,
IWbemContext *pCtx);
typedef struct {
WCHAR * pwcKey;
long lValue;
} InstDef;
extern InstDef MyDefs[];
extern long glNumInst;
#endif
Il file di origine Instpro.cpp contiene codice che implementa le funzioni per il provider dichiarato nel file di intestazione Sample.h.
//*******************************************************************
// INSTPRO.CPP
//
// Module: WMI Instance provider sample code
//
// Purpose: Defines the CInstPro class. An object of this class is
// created by the class factory for each connection.
// Copyright (C) Microsoft. All Rights Reserved.
//
//*******************************************************************
#define _WIN32_WINNT 0x0500
#include <objbase.h>
#include "sample.h"
#include <process.h>
#include <strsafe.h>
#include <sddl.h>
InstDef MyDefs[] = {{L"a", 1}, {L"b", 2}, {L"c", 3}};
long glNumInst = sizeof(MyDefs)/sizeof(InstDef);
//*******************************************************************
//
// CInstPro::CInstPro
// CInstPro::~CInstPro
//
//*******************************************************************
CInstPro::CInstPro(BSTR ObjectPath,
BSTR User,
BSTR Password,
IWbemContext * pCtx)
{
m_pNamespace = NULL;
m_cRef=0;
InterlockedIncrement(&g_cObj);
return;
}
CInstPro::~CInstPro(void)
{
if(m_pNamespace)
m_pNamespace->Release();
InterlockedDecrement(&g_cObj);
return;
}
//*******************************************************************
//
// CInstPro::QueryInterface
// CInstPro::AddRef
// CInstPro::Release
//
// Purpose: IUnknown members for CInstPro object.
//*******************************************************************
STDMETHODIMP CInstPro::QueryInterface(REFIID riid, PPVOID ppv)
{
*ppv=NULL;
// Because you have dual inheritance,
// it is necessary to cast the return type
if(riid== IID_IWbemServices)
*ppv=(IWbemServices*)this;
if(IID_IUnknown==riid || riid== IID_IWbemProviderInit)
*ppv=(IWbemProviderInit*)this;
if (NULL!=*ppv)
{
AddRef();
return NOERROR;
}
else
return E_NOINTERFACE;
}
STDMETHODIMP_(ULONG) CInstPro::AddRef(void)
{
return ++m_cRef;
}
STDMETHODIMP_(ULONG) CInstPro::Release(void)
{
ULONG nNewCount = InterlockedDecrement((long *)&m_cRef);
if (0L == nNewCount)
delete this;
return nNewCount;
}
/********************************************************************
*
* CInstPro::Initialize
*
* Purpose: This is the implementation of IWbemProviderInit.
* The method is required to initialize with CIMOM.
*
********************************************************************/
STDMETHODIMP CInstPro::Initialize(LPWSTR pszUser,
LONG lFlags,
LPWSTR pszNamespace,
LPWSTR pszLocale,
IWbemServices *pNamespace,
IWbemContext *pCtx,
IWbemProviderInitSink *pInitSink)
{
if(! pNamespace)
{
pInitSink->SetStatus(WBEM_E_FAILED , 0);
}
else
{
m_pNamespace = pNamespace;
m_pNamespace->AddRef();
pInitSink->SetStatus(WBEM_S_INITIALIZED, 0);
}
return WBEM_S_NO_ERROR;
}
//*******************************************************************
//
// CInstPro::CreateInstanceEnumAsync
//
// Purpose: Asynchronously enumerates the instances.
//
//*******************************************************************
SCODE CInstPro::CreateInstanceEnumAsync( const BSTR RefStr,
long lFlags,
IWbemContext *pCtx,
IWbemObjectSink FAR* pHandler)
{
//Impersonate the client
HRESULT hr = CoImpersonateClient () ;
if ( FAILED ( hr ) )
{
pHandler->SetStatus ( 0 , hr , NULL , NULL ) ;
return hr ;
}
// Check to see if call is at lower than
// RPC_C_IMP_LEVEL_IMPERSONATE level. If that is the case,
// the provider will not be able to impersonate
// the client to access the protected resources.
DWORD t_CurrentImpersonationLevel =
GetCurrentImpersonationLevel () ;
if ( t_CurrentImpersonationLevel < RPC_C_IMP_LEVEL_IMPERSONATE )
{
// Revert before you perform any operations
CoRevertToSelf () ;
hr = WBEM_E_ACCESS_DENIED;
pHandler->SetStatus ( 0 , hr , NULL , NULL ) ;
return hr ;
}
SCODE sc;
int iCnt;
IWbemClassObject FAR* pNewInst;
// Do a check of arguments and ensure
// you have a pointer to Namespace
if(pHandler == NULL || m_pNamespace == NULL)
return WBEM_E_INVALID_PARAMETER;
for(iCnt=0; iCnt < glNumInst; iCnt++)
{
sc = CreateInst(m_pNamespace,MyDefs[iCnt].pwcKey, MyDefs[iCnt].lValue, &pNewInst, RefStr, pCtx);
if(sc != S_OK)
break;
// Send the object to the caller
pHandler->Indicate(1,&pNewInst);
pNewInst->Release();
}
// Set status
pHandler->SetStatus(0,sc,NULL, NULL);
return sc;
}
//*******************************************************************
//
// CInstPro::GetObjectByPath
// CInstPro::GetObjectByPathAsync
//
// Purpose: Creates an instance given a particular path value.
//
//*******************************************************************
SCODE CInstPro::GetObjectAsync(const BSTR ObjectPath,
long lFlags,
IWbemContext *pCtx,
IWbemObjectSink FAR* pHandler)
{
//Impersonate the client
HRESULT hr = CoImpersonateClient () ;
if ( FAILED ( hr ) )
{
pHandler->SetStatus ( 0 , hr , NULL , NULL ) ;
return hr ;
}
// Check to see if call is at the
// RPC_C_IMP_LEVEL_IDENTIFY level. If that is the case,
// the provider will not be able to impersonate
// the client to access the protected resources.
if (GetCurrentImpersonationLevel () == RPC_C_IMP_LEVEL_IDENTIFY)
{
hr = WBEM_E_ACCESS_DENIED;
pHandler->SetStatus ( 0 , hr , NULL , NULL ) ;
return hr ;
}
SCODE sc;
IWbemClassObject FAR* pObj;
BOOL bOK = FALSE;
// Do a check of arguments and ensure
// you have a pointer to Namespace
if(ObjectPath == NULL ||
pHandler == NULL ||
m_pNamespace == NULL)
return WBEM_E_INVALID_PARAMETER;
// do the get, pass the object on to the notify
sc = GetByPath(ObjectPath,&pObj, pCtx);
if(sc == S_OK)
{
pHandler->Indicate(1,&pObj);
pObj->Release();
bOK = TRUE;
}
sc = (bOK) ? S_OK : WBEM_E_NOT_FOUND;
// Set Status
pHandler->SetStatus(0,sc, NULL, NULL);
return sc;
}
//*******************************************************************
//
// CInstPro::GetByPath
//
// Purpose: Creates an instance given a particular Path value.
//
//*******************************************************************
SCODE CInstPro::GetByPath(BSTR ObjectPath,
IWbemClassObject FAR* FAR* ppObj,
IWbemContext *pCtx)
{
SCODE sc = S_OK;
int iCnt;
// Do a simple path parse. The path looks like
// InstProvSamp.MyKey="a"
// Create a test string with just the part between quotes.
WCHAR wcTest[MAX_PATH+1];
memset(wcTest, NULL, sizeof(wcTest));
StringCbCopyW(wcTest, sizeof(wcTest), ObjectPath);
WCHAR * pwcTest, * pwcCompare = NULL;
int iNumQuotes = 0;
for(pwcTest = wcTest; *pwcTest; pwcTest++)
if(*pwcTest == L'\"')
{
iNumQuotes++;
if(iNumQuotes == 1)
{
pwcCompare = pwcTest+1;
}
else if(iNumQuotes == 2)
{
*pwcTest = NULL;
break;
}
}
else if(*pwcTest == L'.')
*pwcTest = NULL; // isolate the class name.
if(iNumQuotes != 2)
return WBEM_E_FAILED;
// check the instance list for a match.
for(iCnt = 0; iCnt < glNumInst; iCnt++)
{
if(!_wcsicmp(MyDefs[iCnt].pwcKey, pwcCompare))
{
sc = CreateInst(m_pNamespace,MyDefs[iCnt].pwcKey, MyDefs[iCnt].lValue, ppObj, wcTest, pCtx);
return sc;
}
}
return WBEM_E_NOT_FOUND;
}
Il file di origine Utils.cpp contiene codice che implementa le funzioni di utilità per il provider dichiarato nel file di intestazione Sample.h.
//*******************************************************************
// UTILS.CPP
// Module: WMI Instance provider sample code
// Purpose: General purpose utilities.
// (c) Microsoft. All rights reserved.
//
//*******************************************************************
#include <objbase.h>
#include "sample.h"
//*******************************************************************
//
// CreateInst
//
// Purpose: Creates a new instance and sets
// the initial values of the properties.
//
// Return: S_OK if all is well, otherwise an error code is returned
//
//*******************************************************************
SCODE CreateInst(IWbemServices * pNamespace,
LPWSTR pKey,
long lVal,
IWbemClassObject ** pNewInst,
WCHAR * pwcClassName,
IWbemContext *pCtx)
{
SCODE sc;
IWbemClassObject * pClass = NULL;
sc = pNamespace->GetObject(pwcClassName, 0, pCtx, &pClass, NULL);
if(sc != S_OK)
return WBEM_E_FAILED;
sc = pClass->SpawnInstance(0, pNewInst);
pClass->Release();
if(FAILED(sc))
return sc;
VARIANT v;
// Set the key property value.
v.vt = VT_BSTR;
v.bstrVal = SysAllocString(pKey);
if (!v.bstrVal)
return WBEM_E_OUT_OF_MEMORY;
sc = (*pNewInst)->Put(L"MyKey", 0, &v, 0);
VariantClear(&v);
if(FAILED(sc))
return sc;
// Set the number property value.
v.vt = VT_I4;
v.lVal = lVal;
sc = (*pNewInst)->Put(L"MyValue", 0, &v, 0);
return sc;
}
/********************************************************************
*
* Name: GetCurrentImpersonationLevel
* Description: Get COM impersonation level of caller.
*
*******************************************************************/
DWORD GetCurrentImpersonationLevel ()
{
DWORD t_ImpersonationLevel = RPC_C_IMP_LEVEL_ANONYMOUS ;
HANDLE t_ThreadToken = NULL ;
BOOL t_Status = OpenThreadToken(GetCurrentThread(),TOKEN_QUERY,TRUE,&t_ThreadToken);
if ( t_Status )
{
SECURITY_IMPERSONATION_LEVEL t_Level = SecurityAnonymous ;
DWORD t_Returned = 0 ;
t_Status = GetTokenInformation( t_ThreadToken,
TokenImpersonationLevel,
&t_Level,
sizeof(SECURITY_IMPERSONATION_LEVEL),
&t_Returned);
CloseHandle ( t_ThreadToken ) ;
if ( t_Status == FALSE )
{
t_ImpersonationLevel = RPC_C_IMP_LEVEL_ANONYMOUS ;
}
else
{
switch ( t_Level )
{
case SecurityAnonymous:
{
t_ImpersonationLevel = RPC_C_IMP_LEVEL_ANONYMOUS;
}
break;
case SecurityIdentification:
{
t_ImpersonationLevel = RPC_C_IMP_LEVEL_IDENTIFY;
}
break ;
case SecurityImpersonation:
{
t_ImpersonationLevel = RPC_C_IMP_LEVEL_IMPERSONATE;
}
break ;
case SecurityDelegation:
{
t_ImpersonationLevel = RPC_C_IMP_LEVEL_DELEGATE ;
}
break ;
default:
{
t_ImpersonationLevel = RPC_C_IMP_LEVEL_ANONYMOUS ;
}
break ;
}
}
}
else
{
ULONG t_LastError = GetLastError () ;
if ( t_LastError == ERROR_NO_IMPERSONATION_TOKEN ||
t_LastError == ERROR_NO_TOKEN )
{
t_ImpersonationLevel = RPC_C_IMP_LEVEL_DELEGATE ;
}
else
{
if ( t_LastError == ERROR_CANT_OPEN_ANONYMOUS )
{
t_ImpersonationLevel = RPC_C_IMP_LEVEL_ANONYMOUS ;
}
else
{
t_ImpersonationLevel = RPC_C_IMP_LEVEL_ANONYMOUS ;
}
}
}
return t_ImpersonationLevel ;
}
Il file di origine Classfac.cpp contiene codice che crea oggetti quando vengono richieste le connessioni.
//*******************************************************************
//
// CLASSFAC.CPP
// Module: WMI Instance provider sample code
// Purpose: Contains the class factory. This creates objects when
// connections are requested.
// Copyright (C) Microsoft. All Rights Reserved.
//
//*******************************************************************
#include <objbase.h>
#include "sample.h"
//*******************************************************************
//
// CProvFactory::CProvFactory
// CProvFactory::~CProvFactory
//
// Constructor Parameters:
// None
//*******************************************************************
CProvFactory::CProvFactory()
{
m_cRef=0L;
return;
}
CProvFactory::~CProvFactory(void)
{
return;
}
//*******************************************************************
//
// CProvFactory::QueryInterface
// CProvFactory::AddRef
// CProvFactory::Release
//
// Purpose: Standard Ole routines needed for all interfaces
//
//*******************************************************************
STDMETHODIMP CProvFactory::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 E_NOINTERFACE;
}
STDMETHODIMP_(ULONG) CProvFactory::AddRef(void)
{
return ++m_cRef;
}
STDMETHODIMP_(ULONG) CProvFactory::Release(void)
{
ULONG nNewCount = InterlockedDecrement((long *)&m_cRef);
if (0L == nNewCount)
delete this;
return nNewCount;
}
//*******************************************************************
//
// CProvFactory::CreateInstance
//
// Purpose: Instantiates a Locator object
// and returns an interface pointer.
//
// Parameters:
// pUnkOuter LPUNKNOWN to the controlling IUnknown if
// being used in an aggregation.
// riid REFIID identifies 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 you cannot support the requested interface.
//*******************************************************************
STDMETHODIMP CProvFactory::CreateInstance(LPUNKNOWN pUnkOuter, REFIID riid, PPVOID ppvObj)
{
CInstPro * pObj;
HRESULT hr;
*ppvObj=NULL;
// This object does not support aggregation.
if (NULL!=pUnkOuter)
return CLASS_E_NOAGGREGATION;
// Create the locator object.
pObj=new CInstPro();
if (NULL==pObj)
return E_OUTOFMEMORY;
hr=pObj->QueryInterface(riid, ppvObj);
//Kill the object if initial creation or Init failed.
if (FAILED(hr))
delete pObj;
return hr;
}
//*******************************************************************
//
// CProvFactory::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 CProvFactory::LockServer(BOOL fLock)
{
if (fLock)
InterlockedIncrement(&g_cLock);
else
InterlockedDecrement(&g_cLock);
return NOERROR;
}
Il file di origine Maindll.cpp contiene codice che controlla quando la DLL può essere scaricata monitorando il numero di oggetti e blocchi, nonché routine che supportano la registrazione automatica.
//*******************************************************************
// MAINDLL.CPP
// Module: WMI Instance provider sample code
// Purpose: Contains DLL entry points. Also has code that controls
// when the DLL can be unloaded by tracking the number of
// objects and locks as well as routines that support
// self registration.
//
// Copyright (C) Microsoft. All Rights Reserved.
//
//*******************************************************************
#include <objbase.h>
#include <initguid.h>
#include <strsafe.h>
#include "sample.h"
HMODULE ghModule;
// TODO, GuidGen should be used to generate a unique number for any
// providers that are going to be used for anything more extensive
// than just testing.
DEFINE_GUID(CLSID_instprovider, 0x22cb8761, 0x914a, 0x11cf, 0xb7, 0x5, 0x0, 0xaa, 0x0, 0x62, 0xcb, 0xb7);
// {22CB8761-914A-11cf-B705-00AA0062CBB7}
//Count number of objects and number of locks.
long g_cObj=0;
long g_cLock=0;
//*******************************************************************
//
// LibMain32
//
// Purpose: Entry point for DLL.
//
// Return: TRUE if OK.
//
//*******************************************************************
BOOL WINAPI LibMain32(HINSTANCE hInstance, ULONG ulReason, LPVOID pvReserved)
{
if (DLL_PROCESS_ATTACH==ulReason)
ghModule = hInstance;
return TRUE;
}
//*******************************************************************
//
// DllGetClassObject
//
// Purpose: Called by Ole when some client wants a class factory.
// Return one only if it is the sort of
// class this DLL supports.
//
//*******************************************************************
STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, PPVOID ppv)
{
HRESULT hr;
CProvFactory *pObj;
if (CLSID_instprovider!=rclsid)
return E_FAIL;
pObj=new CProvFactory();
if (NULL==pObj)
return E_OUTOFMEMORY;
hr=pObj->QueryInterface(riid, ppv);
if (FAILED(hr))
delete pObj;
return hr;
}
//*******************************************************************
//
// DllCanUnloadNow
//
// Purpose: Called periodically by Ole to determine if the
// DLL can be freed.
//
// Return: S_OK if there are no objects in use and the class factory
// is not locked.
//
//*******************************************************************
STDAPI DllCanUnloadNow(void)
{
SCODE sc;
//It is OK to unload if there are no objects or locks on the
// class factory.
sc=(0L==g_cObj && 0L==g_cLock) ? S_OK : S_FALSE;
return sc;
}
//*******************************************************************
//
// DllRegisterServer
//
// Purpose: Called during setup or by regsvr32.
//
// Return: NOERROR if registration successful, error otherwise.
//*******************************************************************
STDAPI DllRegisterServer(void)
{
char szID[128];
WCHAR wcID[128];
char szCLSID[128];
TCHAR szModule[MAX_PATH + 1];
const char * pName = "WMI Sample Instance Provider";
const char * pModel = "Both";
HKEY hKey1, hKey2;
// Create the path.
memset(wcID, NULL, sizeof(wcID));
memset(szID, NULL, sizeof(szID));
StringFromGUID2(CLSID_instprovider, wcID, sizeof(wcID)/sizeof(WCHAR));
wcstombs(szID, wcID, sizeof(szID));
StringCbCopy(szCLSID, sizeof(szCLSID), "Software\\classes\\CLSID\\");
StringCbCat(szCLSID, sizeof(szCLSID), (LPCTSTR)szID);
// Create entries under CLSID
LONG lRet = RegCreateKeyEx( HKEY_LOCAL_MACHINE,
szCLSID,
0,
NULL,
REG_OPTION_NON_VOLATILE,
KEY_WRITE,
NULL,
&hKey1,
NULL );
if (lRet != ERROR_SUCCESS)
{
return E_FAIL;
}
lRet = RegSetValueEx(hKey1, NULL, 0, REG_SZ, (BYTE *)pName, strlen(pName)+1);
if (lRet != ERROR_SUCCESS)
{
RegCloseKey(hKey1);
return E_FAIL;
}
lRet = RegCreateKeyEx( hKey1, "InprocServer32", 0, NULL, REG_OPTION_NON_VOLATILE, KEY_WRITE, NULL, &hKey2, NULL );
if (lRet != ERROR_SUCCESS)
{
RegCloseKey(hKey1);
return E_FAIL;
}
memset(&szModule, NULL, sizeof(szModule));
GetModuleFileName(ghModule, szModule, sizeof(szModule)/sizeof(TCHAR) - 1);
lRet = RegSetValueEx(hKey2, NULL, 0, REG_SZ, (BYTE *)szModule, strlen(szModule)+1);
if (lRet != ERROR_SUCCESS)
{
RegCloseKey(hKey2);
RegCloseKey(hKey1);
return E_FAIL;
}
lRet = RegSetValueEx(hKey2, "ThreadingModel", 0, REG_SZ, (BYTE *)pModel, strlen(pModel)+1);
if (lRet != ERROR_SUCCESS)
{
RegCloseKey(hKey2);
RegCloseKey(hKey1);
return E_FAIL;
}
RegCloseKey(hKey1);
RegCloseKey(hKey2);
return NOERROR;
}
//*******************************************************************
//
// DllUnregisterServer
//
// Purpose: Called when it is time to remove the registry entries.
//
// Return: NOERROR if registration successful, error otherwise.
//*******************************************************************
STDAPI DllUnregisterServer(void)
{
TCHAR szID[128];
WCHAR wcID[128];
TCHAR szCLSID[128];
HKEY hKey;
// Create the path using the CLSID
memset(wcID, NULL, sizeof(wcID));
memset(szID, NULL, sizeof(szID));
StringFromGUID2(CLSID_instprovider, wcID, sizeof(wcID)/sizeof(WCHAR));
wcstombs(szID, wcID, sizeof(szID));
StringCbCopy(szCLSID, sizeof(szCLSID), "Software\\classes\\CLSID\\");
StringCbCat(szCLSID, sizeof(szCLSID), (LPCTSTR)szID);
// First delete the InProcServer subkey.
DWORD dwRet = RegOpenKeyEx(HKEY_LOCAL_MACHINE, szCLSID, 0, KEY_WRITE, &hKey);
if(dwRet == NO_ERROR)
{
RegDeleteKey(hKey, "InProcServer32");
RegCloseKey(hKey);
}
dwRet = RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\classes\\CLSID", 0, KEY_WRITE, &hKey);
if(dwRet == NO_ERROR)
{
RegDeleteKey(hKey,szID);
RegCloseKey(hKey);
}
return NOERROR;
}
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