ODA BimRv SDK provides the API for getting element parameters and parameter values:

• The getListParams() method from the OdBmObject class and its descendants is used for getting the list of built-in (system) element parameters. This method accepts an array of built-in parameter objects, fills and returns it. Each parameter object is an instance of OdBm::BuiltInParameterDefinition class defined in the BimRv/Include/Database/BmBuiltInParameter.h header file. This method is currently available for OdBmElement and OdBmVWall classes.
• One of the getParam() methods of the OdBmElement class (and its descendants) can be used for getting the current value of the parameter.

The OdBmElement class interface provides a set of getParam() methods. Which version of getParam() method should be used, depends on:

• The data type of the parameter value: double, OdInt32, String or an element identifier (an OdBmObjectId class instance)
• Whether the parameter is built-in (system) or not.

If you need to get the value of a built-in parameter, use one of the following methods:

OdResult getParam(const OdBm::BuiltInParameter::Enum& parameterId, double& value) const;
OdResult getParam(const OdBm::BuiltInParameter::Enum& parameterId, OdInt32& value) const;
OdResult getParam(const OdBm::BuiltInParameter::Enum& parameterId, OdString& value) const;
OdResult getParam(const OdBm::BuiltInParameter::Enum& parameterId, OdBmObjectId& value) const;

If the parameter is not built-in, you should use another method signature:

OdResult getParam(const OdBmObjectId& parameterId, double& value) const;
OdResult getParam(const OdBmObjectId& parameterId, OdInt32& value) const;
OdResult getParam(const OdBmObjectId& parameterId, OdString& value) const;
OdResult getParam(const OdBmObjectId& parameterId, OdBmObjectId& value) const;

If you don't know the storage type of a built-in parameter, you can use data type independent version of getParam() method that returns an OdTfVariant value:

OdResult getParam(const OdBm::BuiltInParameter::Enum& parameterId, OdTfVariant& value) const;

Or, for non built-in parameters:

OdResult getParam(const OdBmObjectId& parameterId, OdTfVariant& value) const;

As you can see from getParam() method definitions, this method returns an OdResult value. The getParam() method can return one of the following values:

• eOk — The requested parameter is found in the list of available parameters and the parameter value was successfully received.
• eNotImplementedYet — The requested parameter is found in the list of available parameters, but the parameter value is not yet implemented.
• eParamHasNoValue — The requested parameter is found in the list of available parameters, but the value of the parameter is absent (parameter doesn't have a value).
• eKeyNotFound — The requested parameter is not found in the list of available parameters.

See Also

Overview of Parameters
Work with Parameters