IMoniker::ParseDisplayName - OLE Programmer's Reference

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IMoniker::ParseDisplayName

Reads as many characters of the specified display name as it understands and builds a moniker corresponding to the portion read; this procedure is known as "parsing" the display name.

HRESULT ParseDisplayName(

IBindCtx *pbc,	//Bind context to be used
IMoniker *pmkToLeft,	//Moniker to the left in the composite
LPOLESTR pszDisplayName,	//Display name
ULONG *pchEaten,	//Receives number of characters consumed
IMoniker **ppmkOut	//Receives moniker built from display name
);

Parameters
pbc

[in] Points to 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. For more information, see IBindCtx.

pmkToLeft

[in] Points to the moniker that has been built out of the display name up to this point.

pszDisplayName

[in] Points to a zero-terminated string containing the remaining display name to be parsed. For Win32 applications, the LPOLESTR type indicates a wide character string (two bytes per character); otherwise, the string has one byte per character.

pchEaten

[out] Receives the number of characters in pszDisplayName that were consumed in this step.

ppmkOut

[out] Receives a pointer to the moniker that was built from pszDisplayName. If an error occurs, the implementation sets *ppmkOut to NULL. If *ppmkOut is non-NULL, the implementation must call IUnknown::AddRef on the parameter; it is the caller's responsibility to call IUnknown::Release.

Return Values
S_OK

The parsing operation was completed successfully.

MK_E_SYNTAX

Indicates an error in the syntax of the input components (pmkToLeft, this moniker, and pszDisplayName). For example, a file moniker returns this error if pmkToLeft is non-NULL, and an item moniker returns it if pmkToLeft is NULL.

E_OUTOFMEMORY

Indicates insufficient memory.

E_UNEXPECTED

Indicates an unexpected error.

IMoniker::BindToObject errors

Parsing display names may cause binding. Thus, any error associated with this function may be returned.

Comments
Notes to Callers
Moniker clients do not typically call IMoniker::ParseDisplayName directly. Instead, they call the MkParseDisplayName API function when they want to convert a display name into a moniker (for example, in implementing the Links dialog box for a container application, or for implementing a macro language that supports references to objects outside the document). That API function first parses the initial portion of the display name itself. It then calls IMoniker::ParseDisplayName on the moniker it has just created, passing the remainder of the display name and getting a new moniker in return; this step is repeated until the entire display name has been parsed.

Notes to Implementors
Your implementation may be able to perform this parsing by itself if your moniker class is designed to designate only certain kinds of objects. Otherwise, you must get an IParseDisplayName interface pointer for the object identified by the moniker-so-far (i.e., the composition of pmkToLeft and this moniker) and then return the results of calling IParseDisplayName::ParseDisplayName.

There are different strategies for getting an IParseDisplayName pointer:

You can try to get the object's CLSID (for example, by calling IPersist::GetClassID on the object), and then call the CoGetClassObject API function, requesting the IParseDisplayName interface on the class factory associated with that CLSID.
You can try to bind to the object itself to get an IParseDisplayName pointer.
You can try binding to the object identified by pmkToLeft to get an IOleItemContainer pointer, and then call IOleItemContainer::GetObject to get an IParseDisplayName pointer for the item.

Any objects that are bound should be registered with the bind context (see IBindCtx::RegisterObjectBound) to ensure that they remain running for the duration of the parsing operation.

See Also
IParseDisplayName, MkParseDisplayName

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