}//Get()
//********************************************
//Get() asynchronous
//********************************************
/// <summary>
/// <para>Invokes the WMI query, asynchronously, and binds to a watcher to deliver the results.</para>
/// </summary>
/// <param name='watcher'>The watcher that raises events triggered by the operation. </param>
public void Get(ManagementOperationObserver watcher)
{
if (null == watcher)
{
throw new ArgumentNullException("watcher");
}
Initialize();
IWbemServices wbemServices = scope.GetIWbemServices();
EnumerationOptions enumOptions = (EnumerationOptions)options.Clone();
// Ensure we switch off ReturnImmediately as this is invalid for async calls
enumOptions.ReturnImmediately = false;
// If someone has registered for progress, make sure we flag it
if (watcher.HaveListenersForProgress)
{
enumOptions.SendStatus = true;
}
WmiEventSink sink = watcher.GetNewSink(scope, enumOptions.Context);
SecurityHandler securityHandler = scope.GetSecurityHandler();
int status = (int)ManagementStatus.NoError;
try
{
//If this is a simple SelectQuery (className only), and the enumerateDeep is set, we have
//to find out whether this is a class enumeration or instance enumeration and call CreateInstanceEnum/
//CreateClassEnum appropriately, because with ExecQuery we can't do a deep enumeration.
if ((query.GetType() == typeof(SelectQuery)) &&
(((SelectQuery)query).Condition == null) &&
(((SelectQuery)query).SelectedProperties == null) &&
(options.EnumerateDeep == true))
{
//Need to make sure that we're not passing invalid flags to enumeration APIs.
//The only flags not valid for enumerations are EnsureLocatable & PrototypeOnly.
enumOptions.EnsureLocatable = false; enumOptions.PrototypeOnly = false;
if (((SelectQuery)query).IsSchemaQuery == false) //deep instance enumeration
{
status = scope.GetSecuredIWbemServicesHandler(wbemServices).CreateInstanceEnumAsync_(((SelectQuery)query).ClassName,
enumOptions.Flags,
enumOptions.GetContext(),
sink.Stub);
}
else
{
status = scope.GetSecuredIWbemServicesHandler(wbemServices).CreateClassEnumAsync_(((SelectQuery)query).ClassName,
enumOptions.Flags,
enumOptions.GetContext(),
sink.Stub);
}
}
else //we can use ExecQuery
{
//Make sure the EnumerateDeep flag bit is turned off because it's invalid for queries
enumOptions.EnumerateDeep = true;
status = scope.GetSecuredIWbemServicesHandler(wbemServices).ExecQueryAsync_(
query.QueryLanguage,
query.QueryString,
enumOptions.Flags,
enumOptions.GetContext(),
sink.Stub);
}
}
catch (COMException e)
{
//
watcher.RemoveSink(sink);
ManagementException.ThrowWithExtendedInfo(e);
}
finally
{
securityHandler.Reset();
}
if ((status & 0xfffff000) == 0x80041000)
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
else if ((status & 0x80000000) != 0)
{
Marshal.ThrowExceptionForHR(status);
}
}
//****************************************
//MoveNext
//****************************************
/// <summary>
/// Indicates whether the enumerator has moved to
/// the next object in the enumeration.
/// </summary>
/// <returns>
/// <para><see langword='true'/>, if the enumerator was
/// successfully advanced to the next element; <see langword='false'/> if the enumerator has
/// passed the end of the collection.</para>
/// </returns>
public bool MoveNext()
{
if (isDisposed)
{
throw new ObjectDisposedException(name);
}
//If there are no more objects in the collection return false
if (atEndOfCollection)
{
return(false);
}
//Look for the next object
cacheIndex++;
if ((cachedCount - cacheIndex) == 0) //cache is empty - need to get more objects
{
//If the timeout is set to infinite, need to use the WMI infinite constant
int timeout = (collectionObject.options.Timeout.Ticks == Int64.MaxValue) ?
(int)tag_WBEM_TIMEOUT_TYPE.WBEM_INFINITE : (int)collectionObject.options.Timeout.TotalMilliseconds;
//Get the next [BLockSize] objects within the specified timeout
//
SecurityHandler securityHandler = collectionObject.scope.GetSecurityHandler();
//Because Interop doesn't support custom marshalling for arrays, we have to use
//the "DoNotMarshal" objects in the interop and then convert to the "FreeThreaded"
//counterparts afterwards.
IWbemClassObject_DoNotMarshal[] tempArray = new IWbemClassObject_DoNotMarshal[collectionObject.options.BlockSize];
int status = collectionObject.scope.GetSecuredIEnumWbemClassObjectHandler(enumWbem).Next_(timeout, (uint)collectionObject.options.BlockSize, tempArray, ref cachedCount);
securityHandler.Reset();
if (status >= 0)
{
//Convert results and put them in cache.
for (int i = 0; i < cachedCount; i++)
{
cachedObjects[i] = new IWbemClassObjectFreeThreaded
(
Marshal.GetIUnknownForObject(tempArray[i])
);
}
}
if (status < 0)
{
if ((status & 0xfffff000) == 0x80041000)
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
else
{
Marshal.ThrowExceptionForHR(status);
}
}
else
{
//If there was a timeout and no object can be returned we throw a timeout exception...
// -
if ((status == (int)tag_WBEMSTATUS.WBEM_S_TIMEDOUT) && (cachedCount == 0))
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
//If not timeout and no objects were returned - we're at the end of the collection
if ((status == (int)tag_WBEMSTATUS.WBEM_S_FALSE) && (cachedCount == 0))
{
atEndOfCollection = true;
cacheIndex--; //back to last object
/* This call to Dispose is being removed as per discussion with URT people and the newly supported
* Dispose() call in the foreach implementation itself.
*
* //Release the COM object (so that the user doesn't have to)
* Dispose();
*/
return(false);
}
}
cacheIndex = 0;
}
return(true);
}
//********************************************
//Get()
//********************************************
/// <overload>
/// Invokes the specified WMI query and returns the resulting collection.
/// </overload>
/// <summary>
/// <para>Invokes the specified WMI query and returns the
/// resulting collection.</para>
/// </summary>
/// <returns>
/// <para>A <see cref='System.Management.ManagementObjectCollection'/> containing the objects that match the
/// specified query.</para>
/// </returns>
public ManagementObjectCollection Get()
{
Initialize();
IEnumWbemClassObject ew = null;
SecurityHandler securityHandler = scope.GetSecurityHandler();
EnumerationOptions enumOptions = (EnumerationOptions)options.Clone();
int status = (int)ManagementStatus.NoError;
try
{
//If this is a simple SelectQuery (className only), and the enumerateDeep is set, we have
//to find out whether this is a class enumeration or instance enumeration and call CreateInstanceEnum/
//CreateClassEnum appropriately, because with ExecQuery we can't do a deep enumeration.
if ((query.GetType() == typeof(SelectQuery)) &&
(((SelectQuery)query).Condition == null) &&
(((SelectQuery)query).SelectedProperties == null) &&
(options.EnumerateDeep == true))
{
//Need to make sure that we're not passing invalid flags to enumeration APIs.
//The only flags not valid for enumerations are EnsureLocatable & PrototypeOnly.
enumOptions.EnsureLocatable = false; enumOptions.PrototypeOnly = false;
if (((SelectQuery)query).IsSchemaQuery == false) //deep instance enumeration
{
status = scope.GetSecuredIWbemServicesHandler(scope.GetIWbemServices()).CreateInstanceEnum_(
((SelectQuery)query).ClassName,
enumOptions.Flags,
enumOptions.GetContext(),
ref ew);
}
else //deep class enumeration
{
status = scope.GetSecuredIWbemServicesHandler(scope.GetIWbemServices()).CreateClassEnum_(((SelectQuery)query).ClassName,
enumOptions.Flags,
enumOptions.GetContext(),
ref ew);
}
}
else //we can use ExecQuery
{
//Make sure the EnumerateDeep flag bit is turned off because it's invalid for queries
enumOptions.EnumerateDeep = true;
status = scope.GetSecuredIWbemServicesHandler(scope.GetIWbemServices()).ExecQuery_(
query.QueryLanguage,
query.QueryString,
enumOptions.Flags,
enumOptions.GetContext(),
ref ew);
}
}
catch (COMException e)
{
//
ManagementException.ThrowWithExtendedInfo(e);
}
finally
{
securityHandler.Reset();
}
if ((status & 0xfffff000) == 0x80041000)
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
else if ((status & 0x80000000) != 0)
{
Marshal.ThrowExceptionForHR(status);
}
//Create a new collection object for the results
return(new ManagementObjectCollection(scope, options, ew));
}//Get()
public ManagementBaseObject WaitForNextEvent()
{
unsafe
{
int totalMilliseconds;
ManagementBaseObject managementBaseObject = null;
this.Initialize();
lock (this)
{
SecurityHandler securityHandler = this.Scope.GetSecurityHandler();
int num = 0;
try
{
if (this.enumWbem == null)
{
num = this.scope.GetSecuredIWbemServicesHandler(this.Scope.GetIWbemServices()).ExecNotificationQuery_(this.query.QueryLanguage, this.query.QueryString, this.options.Flags, this.options.GetContext(), ref this.enumWbem);
}
if (num >= 0)
{
if (this.cachedCount - this.cacheIndex == 0)
{
IWbemClassObject_DoNotMarshal[] wbemClassObjectDoNotMarshalArray = new IWbemClassObject_DoNotMarshal[this.options.BlockSize];
if (ManagementOptions.InfiniteTimeout == this.options.Timeout)
{
totalMilliseconds = -1;
}
else
{
TimeSpan timeout = this.options.Timeout;
totalMilliseconds = (int)timeout.TotalMilliseconds;
}
int num1 = totalMilliseconds;
num = this.scope.GetSecuredIEnumWbemClassObjectHandler(this.enumWbem).Next_(num1, this.options.BlockSize, wbemClassObjectDoNotMarshalArray, ref this.cachedCount);
this.cacheIndex = 0;
if (num >= 0)
{
if (this.cachedCount == 0)
{
ManagementException.ThrowWithExtendedInfo(ManagementStatus.Timedout);
}
for (int i = 0; (long)i < (long)this.cachedCount; i++)
{
this.cachedObjects[i] = new IWbemClassObjectFreeThreaded(Marshal.GetIUnknownForObject(wbemClassObjectDoNotMarshalArray[i].NativeObject));
}
}
}
if (num >= 0)
{
ManagementEventWatcher managementEventWatcher = this;
managementEventWatcher.cacheIndex = managementEventWatcher.cacheIndex + 1;
}
}
}
finally
{
securityHandler.Reset();
}
if (num < 0)
{
if (((long)num & (long)-4096) != (long)-2147217408)
{
Marshal.ThrowExceptionForHR(num);
}
else
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)num);
}
}
}
return(managementBaseObject);
}
}
/// <summary>
/// <para>Waits for the next event that matches the specified query to arrive, and
/// then returns it.</para>
/// </summary>
/// <returns>
/// <para>A <see cref='System.Management.ManagementBaseObject'/> representing the
/// newly arrived event.</para>
/// </returns>
/// <remarks>
/// <para>If the event watcher object contains options with
/// a specified timeout, the API will wait for the next event only for the specified
/// amount of time; otherwise, the API will be blocked until the next event occurs.</para>
/// </remarks>
public ManagementBaseObject WaitForNextEvent()
{
ManagementBaseObject obj = null;
Initialize();
#pragma warning disable CA2002
lock (this)
#pragma warning restore CA2002
{
SecurityHandler securityHandler = Scope.GetSecurityHandler();
int status = (int)ManagementStatus.NoError;
try
{
if (null == enumWbem) //don't have an enumerator yet - get it
{
//Execute the query
status = scope.GetSecuredIWbemServicesHandler(Scope.GetIWbemServices()).ExecNotificationQuery_(
query.QueryLanguage,
query.QueryString,
options.Flags,
options.GetContext(),
ref enumWbem);
}
if (status >= 0)
{
if ((cachedCount - cacheIndex) == 0) //cache is empty - need to get more objects
{
//Because Interop doesn't support custom marshalling for arrays, we have to use
//the "DoNotMarshal" objects in the interop and then convert to the "FreeThreaded"
//counterparts afterwards.
IWbemClassObject_DoNotMarshal[] tempArray = new IWbemClassObject_DoNotMarshal[options.BlockSize];
int timeout = (ManagementOptions.InfiniteTimeout == options.Timeout)
? (int)tag_WBEM_TIMEOUT_TYPE.WBEM_INFINITE :
(int)options.Timeout.TotalMilliseconds;
status = scope.GetSecuredIEnumWbemClassObjectHandler(enumWbem).Next_(timeout, (uint)options.BlockSize, tempArray, ref cachedCount);
cacheIndex = 0;
if (status >= 0)
{
//Convert results and put them in cache. Note that we may have timed out
//in which case we might not have all the objects. If no object can be returned
//we throw a timeout exception.
if (cachedCount == 0)
{
ManagementException.ThrowWithExtendedInfo(ManagementStatus.Timedout);
}
for (int i = 0; i < cachedCount; i++)
{
cachedObjects[i] = new IWbemClassObjectFreeThreaded(Marshal.GetIUnknownForObject(tempArray[i]));
}
}
}
if (status >= 0)
{
obj = new ManagementBaseObject(cachedObjects[cacheIndex]);
cacheIndex++;
}
}
}
finally
{
securityHandler.Reset();
}
if (status < 0)
{
if ((status & 0xfffff000) == 0x80041000)
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
else
{
Marshal.ThrowExceptionForHR(status, WmiNetUtilsHelper.GetErrorInfo_f());
}
}
}
return(obj);
}
/// <summary>
/// <para>Waits for the next event that matches the specified query to arrive, and
/// then returns it.</para>
/// </summary>
/// <returns>
/// <para>A <see cref='System.Management.ManagementBaseObject'/> representing the
/// newly arrived event.</para>
/// </returns>
/// <remarks>
/// <para>If the event watcher object contains options with
/// a specified timeout, the API will wait for the next event only for the specified
/// amount of time; otherwise, the API will be blocked until the next event occurs.</para>
/// </remarks>
public ManagementBaseObject WaitForNextEvent()
{
ManagementBaseObject obj = null;
Initialize();
lock (this)
{
SecurityHandler securityHandler = Scope.GetSecurityHandler();
int status = (int)ManagementStatus.NoError;
try
{
if (null == enumWbem) //don't have an enumerator yet - get it
{
//Execute the query
status = Scope.GetIWbemServices().ExecNotificationQuery_(
query.QueryLanguage,
query.QueryString,
options.Flags,
options.GetContext(),
out enumWbem);
//Set security on enumerator
if (status >= 0)
{
securityHandler.Secure(enumWbem);
}
}
if (status >= 0)
{
if ((cachedCount - cacheIndex) == 0) //cache is empty - need to get more objects
{
#if true
//Because Interop doesn't support custom marshalling for arrays, we have to use
//the "DoNotMarshal" objects in the interop and then convert to the "FreeThreaded"
//counterparts afterwards.
IWbemClassObject_DoNotMarshal[] tempArray = new IWbemClassObject_DoNotMarshal[options.BlockSize];
int timeout = (ManagementOptions.InfiniteTimeout == options.Timeout)
? (int)tag_WBEM_TIMEOUT_TYPE.WBEM_INFINITE :
(int)options.Timeout.TotalMilliseconds;
status = enumWbem.Next_(timeout, (uint)options.BlockSize,
tempArray, out cachedCount);
cacheIndex = 0;
if (status >= 0)
{
//Convert results and put them in cache. Note that we may have timed out
//in which case we might not have all the objects. If no object can be returned
//we throw a timeout exception... - TODO: what should happen if there was a timeout
//but at least some objects were returned ??
if (cachedCount == 0)
{
ManagementException.ThrowWithExtendedInfo(ManagementStatus.Timedout);
}
for (int i = 0; i < cachedCount; i++)
{
cachedObjects[i] = new IWbemClassObjectFreeThreaded(Marshal.GetIUnknownForObject(tempArray[i]));
}
}
#else
//This was workaround when using TLBIMP we couldn't pass in arrays...
IWbemClassObjectFreeThreaded cachedObject = cachedObjects[0];
int timeout = (ManagementOptions.InfiniteTimeout == options.Timeout)
? (int)tag_WBEM_TIMEOUT_TYPE.WBEM_INFINITE :
(int)options.Timeout.TotalMilliseconds;
status = enumWbem.Next_(timeout, 1, out cachedObjects, out cachedCount);
cacheIndex = 0;
if (status >= 0)
{
//Create ManagementObject for result. Note that we may have timed out
//in which case we won't have an object
if (null == cachedObject)
{
ManagementException.ThrowWithExtendedInfo(ManagementStatus.Timedout);
}
cachedObjects[0] = cachedObject;
}
#endif
}
if (status >= 0)
{
obj = new ManagementBaseObject(cachedObjects[cacheIndex]);
cacheIndex++;
}
}
}
finally
{
securityHandler.Reset();
}
if (status < 0)
{
if ((status & 0xfffff000) == 0x80041000)
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
else
{
Marshal.ThrowExceptionForHR(status);
}
}
}
return(obj);
}
//****************************************
//MoveNext
//****************************************
/// <summary>
/// Moves to the next object in the enumeration
/// </summary>
public bool MoveNext()
{
if (isDisposed)
{
throw new ObjectDisposedException("ManagementObjectEnumerator");
}
//If there are no more objects in the collection return false
if (atEndOfCollection)
{
return(false);
}
//Look for the next object
cacheIndex++;
if ((cachedCount - cacheIndex) == 0) //cache is empty - need to get more objects
{
//If the timeout is set to infinite, need to use the WMI infinite constant
int timeout = (collectionObject.options.Timeout.Ticks == Int64.MaxValue) ?
(int)tag_WBEM_TIMEOUT_TYPE.WBEM_INFINITE : (int)collectionObject.options.Timeout.TotalMilliseconds;
//Get the next [BLockSize] objects within the specified timeout
// TODO - cannot use arrays of IWbemClassObject with a TLBIMP
// generated wrapper
SecurityHandler securityHandler = collectionObject.scope.GetSecurityHandler();
int status = (int)ManagementStatus.NoError;
#if false
status = enumWbem.Next(timeout, collectionObject.options.BlockSize, out cachedObjects, out cachedCount);
#else
IWbemClassObjectFreeThreaded obj = null;
try {
status = enumWbem.Next_(timeout, 1, out obj, out cachedCount);
}
catch (Exception e) {
ManagementException.ThrowWithExtendedInfo(e);
}
if ((status & 0xfffff000) == 0x80041000)
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
else if ((status & 0x80000000) != 0)
{
Marshal.ThrowExceptionForHR(status);
}
cachedObjects[0] = obj;
#endif
// BUGBUG : Review this
//Check the return code - might be failure, timeout or WBEM_S_FALSE...
if (status != 0) //not success
{
//If it's anything but WBEM_S_FALSE (which means end of collection) - we need to throw
if (status != (int)tag_WBEMSTATUS.WBEM_S_FALSE)
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
//if we got less objects than we wanted, need to check why...
if (cachedCount < collectionObject.options.BlockSize)
{
//If no objects were returned we're at the very end
if (cachedCount == 0)
{
atEndOfCollection = true;
cacheIndex--; //back to last object
//Release the COM object (so that the user doesn't have to)
Dispose();
return(false);
}
}
}
cacheIndex = 0;
securityHandler.Reset();
}
else
{
//Advance the index to the next
cacheIndex++;
}
return(true);
}
//int statusFromMTA;
void InitializeGuts(object o)
{
ManagementScope threadParam = (ManagementScope)o;
IWbemLocator loc = (IWbemLocator) new WbemLocator();
if (null == options)
{
threadParam.Options = new ConnectionOptions();
}
string nsPath = threadParam.prvpath.GetNamespacePath((int)tag_WBEM_GET_TEXT_FLAGS.WBEMPATH_GET_SERVER_AND_NAMESPACE_ONLY);
// If no namespace specified, fill in the default one
if ((null == nsPath) || (0 == nsPath.Length))
{
// NB: we use a special method to set the namespace
// path here as we do NOT want to trigger an
// IdentifierChanged event as a result of this set
bool bUnused;
nsPath = threadParam.prvpath.SetNamespacePath(ManagementPath.DefaultPath.Path, out bUnused);
}
// If we have privileges to enable, now is the time
SecurityHandler securityHandler = GetSecurityHandler();
int status = (int)ManagementStatus.NoError;
//If we're on XP or higher, always use the "max_wait" flag to avoid hanging
if ((Environment.OSVersion.Platform == PlatformID.Win32NT) &&
(Environment.OSVersion.Version.Major >= 5) &&
(Environment.OSVersion.Version.Minor >= 1))
{
threadParam.options.Flags |= (int)tag_WBEM_CONNECT_OPTIONS.WBEM_FLAG_CONNECT_USE_MAX_WAIT;
}
try
{
status = loc.ConnectServer_(
nsPath,
threadParam.options.Username,
threadParam.options.GetPassword(),
threadParam.options.Locale,
threadParam.options.Flags,
threadParam.options.Authority,
threadParam.options.GetContext(),
out threadParam.wbemServices);
//Set security on services pointer
GetSecurityHandler().Secure(threadParam.wbemServices);
//
// RAID: 127453 [marioh]
// Make sure we enable RPC garbage collection to avoid tons
// of useless idle connections not being recycled. This only
// has impact on Win2k and below since XP has this enabled by
// default.
//
if (rpcGarbageCollectionEnabled == false)
{
RpcMgmtEnableIdleCleanup( );
rpcGarbageCollectionEnabled = true;
}
Marshal.ReleaseComObject(loc);
loc = null;
}
catch (Exception e)
{
// BUGBUG : securityHandler.Reset()?
ManagementException.ThrowWithExtendedInfo(e);
}
finally
{
securityHandler.Reset();
}
//statusFromMTA = status;
if ((status & 0xfffff000) == 0x80041000)
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
else if ((status & 0x80000000) != 0)
{
Marshal.ThrowExceptionForHR(status);
}
}
internal void Initialize()
{
//If the path is not set yet we can't do it
if (null == path)
{
throw new InvalidOperationException();
}
/*
* If we're not connected yet, this is the time to do it... We lock
* the state to prevent 2 threads simultaneously doing the same
* connection. To avoid taking the lock unnecessarily we examine
* isConnected first
*/
if (!IsConnected)
{
lock (this)
{
if (!IsConnected)
{
IWbemLocator loc = (IWbemLocator) new WbemLocator();
if (null == options)
{
Options = new ConnectionOptions();
}
string nsPath = path.NamespacePath;
// If no namespace specified, fill in the default one
if ((null == nsPath) || (0 == nsPath.Length))
{
// NB: we use a special method to set the namespace
// path here as we do NOT want to trigger an
// IdentifierChanged event as a result of this set
path.SetNamespacePath(ManagementPath.DefaultPath.Path);
}
// If we have privileges to enable, now is the time
SecurityHandler securityHandler = GetSecurityHandler();
int status = (int)ManagementStatus.NoError;
try {
status = loc.ConnectServer_(
path.NamespacePath,
options.Username,
options.GetPassword(),
options.Locale,
options.Flags,
options.Authority,
options.GetContext(),
out wbemServices);
//Set security on services pointer
Secure(wbemServices);
} catch (Exception e) {
// BUGBUG : securityHandler.Reset()?
ManagementException.ThrowWithExtendedInfo(e);
} finally {
securityHandler.Reset();
}
if ((status & 0xfffff000) == 0x80041000)
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
else if ((status & 0x80000000) != 0)
{
Marshal.ThrowExceptionForHR(status);
}
}
}
}
}
/// <summary>
/// <para>Waits until the next event that matches the specified query arrives,
/// and returns it</para>
/// </summary>
/// <remarks>
/// If the event watcher object contains
/// options with a specified timeout, this API will wait for the next event only for
/// the specified time. If not, the API will block until the next event occurs.
/// </remarks>
public ManagementBaseObject WaitForNextEvent()
{
Trace.WriteLine("Entering WaitForNextEvent...");
ManagementBaseObject obj = null;
Initialize();
lock (this)
{
SecurityHandler securityHandler = Scope.GetSecurityHandler();
int status = (int)ManagementStatus.NoError;
try
{
if (null == enumWbem) //don't have an enumerator yet - get it
{
//Execute the query
status = Scope.GetIWbemServices().ExecNotificationQuery_(
query.QueryLanguage,
query.QueryString,
options.Flags,
options.GetContext(),
out enumWbem);
//Set security on enumerator
if ((status & 0x80000000) == 0)
{
securityHandler.Secure(enumWbem);
}
}
if ((status & 0x80000000) == 0)
{
if ((cachedCount - cacheIndex) == 0) //cache is empty - need to get more objects
{
// TODO - due to TLBIMP restrictions IEnumWBemClassObject.Next will
// not work with arrays - have to set count to 1
#if false
enumWbem.Next((int)options.Timeout.TotalMilliseconds, (uint)options.BlockCount,
out cachedObjects, out cachedCount);
#else
IWbemClassObjectFreeThreaded cachedObject = cachedObjects[0];
int timeout = (ManagementOptions.InfiniteTimeout == options.Timeout)
? (int)tag_WBEM_TIMEOUT_TYPE.WBEM_INFINITE :
(int)options.Timeout.TotalMilliseconds;
status = enumWbem.Next_(timeout, 1, out cachedObject, out cachedCount);
cacheIndex = 0;
if ((status & 0x80000000) == 0)
{
//Create ManagementObject for result. Note that we may have timed out
//in which case we won't have an object
if (null == cachedObject)
{
ManagementException.ThrowWithExtendedInfo(ManagementStatus.Timedout);
}
cachedObjects[0] = cachedObject;
}
#endif
}
if ((status & 0x80000000) == 0)
{
obj = new ManagementBaseObject(cachedObjects[cacheIndex]);
cacheIndex++;
}
}
} catch (Exception e) {
// BUGBUG : securityHandler.Reset()?
if (e is ManagementException)
{
throw; //just let it propagate
}
ManagementException.ThrowWithExtendedInfo(e);
}
finally {
securityHandler.Reset();
Trace.WriteLine("Returning from WaitForNextEvent...");
}
if ((status & 0xfffff000) == 0x80041000)
{
ManagementException.ThrowWithExtendedInfo((ManagementStatus)status);
}
else if ((status & 0x80000000) != 0)
{
Marshal.ThrowExceptionForHR(status);
}
}
return(obj);
}