Leverera data till WMI genom att skriva en leverantör
En WMI-provider skapar en grupp klasser, instanser och händelser som stöds för att skicka data till WMI. I sin tur kan ett hanteringsprogram eller skript anropa providermetoder för att manipulera data som tillhandahålls av leverantören.
Följande diagram illustrerar relationen mellan en provider som är kopplad till WMI och programmet.
Följande procedur beskriver hur du skapar en enkel provider som stöder en uppsättning instanser. Providern som beskrivs här är registrerad för att köras i WMI-processen. I vissa fall använder du en frikopplad leverantör som körs i en annan process. Mer information om värdmodeller för leverantörer finns i Provider Hosting and Security. Steg 1 och 2 i följande procedur skiljer sig åt för frikopplade leverantörer, men i andra avseenden använder de samma gränssnitt som processleverantörer. Mer information finns i Integrera en leverantör i en applikation.
Skapa en instansprovider
Skapa en instans av en __Win32Provider-klass med MOF-kod (Managed Object Format), och ange namnet samt CLSID för providern. Mer information finns i Utforma MOF-klasser (Managed Object Format).
I följande kodexempel visas hur du skapar en instans av en __Win32Provider-klass.
Instance of __Win32Provider as $P // $P is an alias { // Name that describes your provider Name = "InstProvSamp" ; ClsId = "{22CB8761-914A-11cf-B705-00AA0062CBB7}" ; } ;Not
För att säkerställa att alla WMI-klassdefinitioner för hanterade objekt återställs till WMI-lagringsplats om WMI har ett fel och startar om använder du instruktionen #pragma automatisk återställning instruktionsförprocessor i MOF-filen.
Mer information finns i Skapa en instans och registrera en instansprovider.
Skapa en instans av klassen __InstanceProviderRegistration som beskriver instansproviderns funktioner.
I följande kodexempel visas hur du skapar en instans av klassen __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. };Mer information om egenskaperna i det här avsnittet av MOF-kod finns i __InstanceProviderRegistration och __ObjectProviderRegistration.
Mer information finns i Registrering av en instansleverantör.
Använd MOF-kod för att skapa den dynamiska klass som providern tillhandahåller instanser för.
En dynamisk klass är en klass vars instanser tar emot uppdateringar från en provider. Dessa uppdateringar kan vara regelbundna eller länkade till sporadiska ändringar i de objekt som instanserna representerar. Du kan visa ändringar i dynamiska klassinstanser via ditt eget hanteringsprogram eller WMI Object Browser.
I följande kodexempel beskrivs en dynamisk klass som stöds av instProvSamp-providern.
[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; };Registrera dina klasser med WMI via MOF-kompilatorn.
Från kommandotolken i providerkatalogen skriver du följande för att registrera MOF-exempelkoden med WMI.
mofcompinstprov.mof
Mer information finns i Kompilera MOF-filer.
Definiera ett COM-objekt som ska innehålla providern. Exempelkoden för det här steget finns i ett fullständigt exempel i slutet av det här avsnittet.
Precis som med alla COM-objekt måste du implementera en konstruktor och en dekonstruktion, samt metoderna QueryInterface, AddRefoch Release.
Implementera IWbemProviderInit::Initiera metoden i COM-objektet.
Huvudsyftet med Initiera i det här exemplet är att ange den m_pNamespace medlemmen till det aktuella namnområdet. Mer information om namnområden finns i Skapa hierarkier i WMI-.
En mottagare skickas via parametern pInitSink i parametern IWbemProviderInit::Initiera metod för att ange att providern har initierats. Mer information om mottagare finns i IWbemObjectSink och Anropa en metod.
Implementera metoden IWbemServices::CreateInstanceEnumAsync i COM-objektet (även om du kan implementera en mängd olika IWbemServices-gränssnitt implementerar exemplet i slutet av det här avsnittet endast CreateInstanceEnumAsync). Mer specifikt returnerar CreateInstanceEnumAsync instanser av angivna objekt till WMI.
Implementera metoden GetObjectAsync i COM-objektet.
I exemplet i slutet av det här avsnittet GetObjectAsync kontrollerar parametrarna för det hanterade objektet, hämtar det angivna objektet, utför felkontroll och returnerar lämpliga koder till mottagaren.
Registrera providern som ett COM-objekt med Hjälp av RegSvr32.
I kommandotolken i providerkatalogen skriver du följande:
regsvr32InstProv.dll
Din leverantör är nu klar. Nu bör du kunna komma åt instanser av klassen InstProvSamp inifrån WMI.
I följande kodexempel skapas ett COM-objekt som ska innehålla din provider enligt beskrivningen i steg 5 ovan. Det fullständiga exemplet innehåller kod från huvudfilen med titeln Sample.h och källfiler med titeln Instprov.cpp, Utils.cpp, Classfac.cpp och 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
Den Instpro.cpp källfilen innehåller kod som implementerar funktionerna för providern som deklarerats i Sample.h-huvudfilen.
//*******************************************************************
// 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;
}
Den Utils.cpp källfilen innehåller kod som implementerar verktygsfunktionerna för providern som deklareras i Sample.h-huvudfilen.
//*******************************************************************
// 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 ;
}
Den Classfac.cpp källfilen innehåller kod som skapar objekt när anslutningar begärs.
//*******************************************************************
//
// 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;
}
Den Maindll.cpp källfilen innehåller kod som styr när DLL:n kan tas bort genom att spåra antalet objekt och lås samt rutiner som stöder självregistrering.
//*******************************************************************
// 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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