This method maps a name to a member of a type, or binds global variables and functions contained in a type library.
At a Glance
| Header file: | Oaidl.h |
| Windows CE versions: | 2.0 and later |
Syntax
HRESULT Bind(OLECHAR FAR* szName, unsigned long lHashVal, unsigned short wFlags, ITypeInfo FAR*FAR* ppTInfo,
DESCKIND FAR* pDescKind, BINDPTR FAR* pBindPtr );
Parameters
szName
NULL-terminated string that contains the name to be bound.
lHashVal
Hash value for the name computed by LHashValOfNameSys.
wFlags
Flags word that contains one or more of the Invoke flags defined in the INVOKEKIND enumeration. Specifies whether the name was referenced as a method or a property. When binding to a variable, specify the flag INVOKE_PROPERTYGET. Specify zero to bind to any type of member.
ppTInfo
If a FUNCDESC or VARDESC was returned, then ppTInfois a pointer to a pointer to the type description that contains the item to which it is bound.
pDescKind
Pointer to a DESCKIND enumerator that indicates whether the name bound to is a VARDESC, FUNCDESC, or TYPECOMP. If there was no match, points to DESCKIND_NONE.
pBindPtr
On return, contains a pointer to the bound-to VARDESC, FUNCDESC, or ITypeComp interface.
Return Values
One of the values described in the following table is returned.
| Value | Description |
| S_OK | Success. |
| E_OUTOFMEMORY | Out of memory. |
| E_INVALIDARG | One or more of the parameters is invalid. |
| TYPE_E_IOERROR | The function could not read from the file. |
| TYPE_E_INVDATAREAD | Invalid data. |
| TYPE_E_UNSUPFORMAT | The type library has an older format. |
| TYPE_E_INVALIDSTATE | The type library could not be opened. |
| TYPE_E_AMBIGUOUSNAME | More than one instance of this name occurs in the type library. |
Remarks
Use Bind for binding to the variables and methods of a type, or for binding to the global variables and methods in a type library. The returned DESCKIND pointer pDescKind indicates whether the name was bound to a VARDESC, a FUNCDESC, or to an ITypeComp instance. The returned pBindPtr points to the VARDESC, FUNCDESC, or ITypeComp.
If a data member or method is bound to, then ppTInfo points to the type description that contains the method or data member.
If Bind binds the name to a nested binding context, it returns a pointer to an ITypeComp instance in pBindPtr and a NULL type description pointer in ppTInfo. For example, if the name of a type description is passed for a module (TKIND_MODULE), enumeration (TKIND_ENUM), or coclass (TKIND_COCLASS), Bind returns the ITypeComp instance of the type description for the module, enumeration, or coclass. This feature supports languages such as Visual Basic that allow references to members of a type description to be qualified by the name of the type description. For example, a function in a module can be referenced by modulename.functionname.
The members of TKIND_ENUM, TKIND_MODULE, and TKIND_COCLASS types marked as Application objects can be bound to directly from ITypeComp, without specifying the name of the module. The ITypeComp of a coclass defers to the ITypeComp of its default interface.
As with other methods of ITypeComp, ITypeInfo, and ITypeLib, the calling code is responsible for releasing the returned object instances or structures. If a VARDESC or FUNCDESC is returned, the caller is responsible for deleting it with the returned type description and releasing the type description instance itself. Otherwise, if an ITypeComp instance is returned, the caller must release it.
Special rules apply if you call a type library’s Bind method, passing it the name of a member of an Application object class (a class that has the TYPEFLAG_FAPPOBJECT flag set). In this case, Bind returns DESCKIND_IMPLICITAPPOBJ in pDescKind, a VARDESC that describes the Application object in pBindPtr, and the ITypeInfo of the Application object class in ppTInfo. To bind to the object, ITypeInfo::GetTypeComp must make a call to get the ITypeComp of the Application object class, and then reinvoke its Bind method with the name initially passed to the type library’s ITypeComp.
The caller should use the returned ITypeInfo pointer (ppTInfo) to get the address of the member.
The wflags parameter is the same as the wflags parameter in IDispatch::Invoke.