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ITypeComp::Bind (Compact 2013)

  • Artículo

3/26/2014

This method maps a name to a member of a type, or binds global variables and functions contained in a type library.

Syntax

HRESULT Bind(
  OLECHAR FAR* szName, 
  unsigned long lHashVal, 
  unsigned short wFlags, 
  ITypeInfo FAR* FAR* ppTInfo, 
  DESCKIND FAR* pDescKind, 
  BINDPTR FAR* pBindPtr 
);

Parameters

  • szName
    [in] Null-terminated string that contains the name to be bound.
  • lHashVal
    [in] Hash value for the name computed by LHashValOfNameSys.

  • wFlags
    [in] Flags word that contains one or more of the IDispatch::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
    [out] If a FUNCDESC or VARDESC was returned, then ppTInfo is a pointer to a pointer to the type description that contains the item to which it is bound.
  • pDescKind
    [out] 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
    [out] On return, contains a pointer to the bound-to VARDESC, FUNCDESC, or ITypeComp interface.

Return Value

The following table shows the return values for this function.

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 Invoke.

Requirements

Header

oaidl.h,
oaidl.idl

Library

oleaut32.lib,
uuid.lib

See Also

Reference

ITypeComp
DESCKIND
FUNCDESC
IDispatch::Invoke
INVOKEKIND
ITypeInfo
ITypeInfo::GetTypeComp
ITypeLib
VARDESC