IMoniker::IsRunning method

Determines whether the object identified by this moniker is currently loaded and running.

Syntax


HRESULT IsRunning(
  [in]  IBindCtx *pbc,
  [in]  IMoniker *pmkToLeft,
  [in]  IMoniker *pmkNewlyRunning
);

Parameters

pbc [in]

A pointer to the IBindCtx interface on the bind context to be used in this binding operation. The bind context caches objects bound during the binding process, contains parameters that apply to all operations using the bind context, and provides the means by which the moniker implementation should retrieve information about its environment.

pmkToLeft [in]

A pointer to the IMoniker interface on the moniker to the left of this moniker if this moniker is part of a composite. This parameter is used primarily by moniker implementers to enable cooperation between the various components of a composite moniker; moniker clients can usually pass NULL.

pmkNewlyRunning [in]

A pointer to the IMoniker interface on the moniker most recently added to the running object table (ROT). This can be NULL. If non-NULL, the implementation can return the results of calling IMoniker::IsEqual on the pmkNewlyRunning parameter, passing the current moniker. This parameter is intended to enable IsRunning implementations that are more efficient than just searching the ROT, but the implementation can choose to ignore pmkNewlyRunning without causing any harm.

Return value

This method can return the standard return values E_UNEXPECTED, as well as the following values.

Return codeDescription
S_OK

The moniker is running.

S_FALSE

The moniker is not running.

 

Remarks

Notes to Callers

If speed is important when you're requesting services from the object identified by the moniker, you may want those services only if the object is already running (because loading an object into the running state may be time-consuming). In such a situation, you should call IsRunning to determine whether the object is running.

For the monikers stored within linked objects, IsRunning is primarily called by the default handler's implementation of IOleLink::BindIfRunning.

Notes to Implementers

To get a pointer to the ROT, your implementation should call IBindCtx::GetRunningObjectTable on the pbc parameter. Your implementation can then call IRunningObjectTable::IsRunning to determine whether the object identified by the moniker is running. The object identified by the moniker must have registered itself with the ROT when it first began running.

Implementation-specific Notes

ImplementationNotes
Anti-moniker

This method checks the ROT to see whether the object is running.

Class moniker

This method returns E_NOTIMPL.

File moniker

If pmkNewlyRunning is non-NULL, this method returns TRUE if that moniker is equal to this moniker. Otherwise, the method asks the ROT whether this moniker is running. The method ignores pmkToLeft.

Generic composite moniker

If pmkToLeft is non-NULL, this method composes pmkToLeft with this moniker and calls IsRunning on the result.

If pmkToLeft is NULL, this method returns TRUE if pmkNewlyRunning is non-NULL and is equal to this moniker.

If pmkToLeft and pmkNewlyRunning are both NULL, this method checks the ROT to see whether the moniker is running. If so, the method returns S_OK; otherwise, it recursively calls IsRunning on the rightmost component of the composite, passing the remainder of the composite as the pmkToLeft parameter for that call. This handles the case where the moniker identifies a pseudo-object that is not registered as running; see the item moniker implementation for more details.

Item moniker

If pmkToLeft is NULL, this method returns TRUE if pmkNewlyRunning is non-NULL and is equal to this moniker. Otherwise, the method checks the ROT to see whether this moniker is running.

If pmkToLeft is non-NULL, the method calls IMoniker::BindToObject on the pmkToLeft parameter, requesting an IOleItemContainer interface pointer. The method then calls IOleItemContainer::IsRunning, passing the string contained within this moniker.

OBJREF moniker

Because OBJREF monikers represent a running object instance, this method returns TRUE unless the object is known to be no longer running because a recent call failed. The method ignores pmkToLeft.

Pointer moniker

This method always returns S_OK, because the object identified by a pointer moniker must always be running.

URL moniker

Returns S_OK if this moniker is currently running. Otherwise, it returns S_FALSE. The URL moniker determines whether it is running by first checking whether it is equal to the newly running moniker, by making the following call: pmkNewlyRunning->IsEqual. Typically, this call is an inexpensive operation. If this does not succeed, the moniker next checks to see whether it is registered with the ROT of the passed-in bind context.

 

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

ObjIdl.h

IDL

ObjIdl.idl

IID

IID_IMoniker is defined as 0000000f-0000-0000-C000-000000000046

See also

IMoniker
IOleLink::BindIfRunning
IRunningObjectTable::IsRunning

 

 

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