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The IRawObjectAccess custom
interface is provided for users of the IBM Informix
ESQL/C API and
the Microsoft ODBC API. IRawObjectAccess enables
you to instantiate an ActiveX value object with raw data or to extract
raw data from an existing value object.
If
you are using the IBM Informix
ESQL/C API or
the Microsoft ODBC API and a query of the
database server results in an ActiveX value object, you get the
raw data of the object. You can use this data and the methods of
the IRawObjectAccess interface to instantiate
the ActiveX value object and access its custom methods.
To instantiate the ActiveX value object and access its custom
methods
- Call CoCreateInstance() with a CLSID of CLSID_OPAQUE and
an IID of IID_RawObjectAccess to
create an empty ActiveX value object.
- Pass the raw object data to the SetDataC() method
to fill the ActiveX value object.
- Use QueryInterface() to get the IID for
the IDispatch interface (IID_IDispatch).
- Use IDispatch::Invoke() to access the
custom methods of the ActiveX value object.
The IRawObjectAccess interface provides
the following methods.
| Method |
Description |
| void * GetDataC() |
Returns a pointer to OpaqueStruct,
the C data structure that defines the opaque type that is encapsulated
as an ActiveX value object. |
| SetDataC(void *struct) |
Sets OpaqueStruct to the
values specified by struct. |
| void * GetDataCpp() |
Returns a pointer to OpaqueClient,
the C++ object that represents the ActiveX value object. |
| SetDataCpp(void * struct) |
Sets OpaqueClient (returned
by GetDataCpp) to the values specified by struct. |
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