CBaseDispatch Class
The CBaseDispatch class is a base class that implements the IDispatch interface for use in a dual interface. A dual interface provides Automation and custom interface access to an interface.
CMediaControl and CMediaPosition (and other dual-interface support classes) are derived from this class or have members that are instances of this class.
For more information about the IDispatch methods, see the COM documentation included with the Microsoft® Platform Software Development Kit (SDK).
Member Functions
CBaseDispatch Constructs a CBaseDispatch object.
Implemented IDispatch Methods
GetIDsOfNames Maps a single member function and an optional set of parameters to a corresponding set of integer dispatch identifiers, which can be used upon subsequent calls to the IDispatch::Invoke method. GetTypeInfo Retrieves a type-information object, which can retrieve the type information for an interface. GetTypeInfoCount Retrieves the number of type-information interfaces provided by an object.
CBaseDispatch::CBaseDispatch
CBaseDispatch Class
Constructs a CBaseDispatch object.
Syntax
CBaseDispatch(void);
Return Value
No return value.
CBaseDispatch::GetIDsOfNames
CBaseDispatch Class
Maps a single member function and an optional set of parameters to a corresponding set of integer dispatch identifiers, which can be used upon subsequent calls to the IDispatch::Invoke method.
Syntax
HRESULT GetIDsOfNames(
REFIID riid,
OLECHAR **rgszNames,
UINT cNames,
LCID lcid,
DISPID *rgdispid
);
Parameters
- riid
- Reference identifier. Reserved for future use. Must be NULL.
- rgszNames
- Address of a pointer to a passed-in array of names to be mapped.
- cNames
- Count of the names to be mapped.
- lcid
- Local context in which to interpret the names.
- rgdispid
- Pointer to a caller-allocated array, each element of which contains an identifier that corresponds to one of the names passed in the rgszNames parameter. The first element represents the member name; the subsequent elements represent each of the member's parameters.
Return Value
Returns one of the following values.
S_OK Success. E_OUTOFMEMORY Out of memory. DISP_E_UNKNOWNNAME One or more of the names were not known. The returned DISPIDs contain DISPID_UNKNOWN for each entry that corresponds to an unknown name. DISP_E_UNKNOWN_CLSID The class identifier was not recognized.
CBaseDispatch::GetTypeInfo
CBaseDispatch Class
Retrieves a type-information object, which can retrieve the type information about an interface.
Syntax
HRESULT GetTypeInfo(
UINT itinfo,
LCID lcid,
ITypeInfo **pptinfo
);
Parameters
- itinfo
- Type information to return. Pass zero to retrieve type information for the IDispatch implementation.
- lcid
- Local identifier for the type information. An object can return different type information for different languages. This capability is important for classes that support localized member names. For classes that do not support localized member names, ignore this parameter.
- pptinfo
- Address of a pointer to the type-information object requested.
Return Value
Returns an E_POINTER if pptinfo is invalid. Returns TYPE_E_ELEMENTNOTFOUND if itinfo is not zero. Returns S_OK if is successful. Otherwise, returns an HRESULT from one of the calls to retrieve the type. The HRESULT indicates the error and can be one of the following standard constants, or other values not listed:
E_FAIL Failure. E_POINTER Null pointer argument. E_INVALIDARG Invalid argument. S_OK or NOERROR Success.
CBaseDispatch::GetTypeInfoCount
CBaseDispatch Class
Retrieves the number of type-information interfaces provided by an object.
Syntax
HRESULT GetTypeInfoCount(
UINT *pctinfo
);
Parameters
- pctinfo
- Pointer to the location that receives the number of type-information interfaces that the object provides. If the object provides type information, this number is 1; otherwise, the number is 0.
Return Value
Returns E_POINTER if pctinfo is invalid; otherwise, returns S_OK.
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