Returns the usage of the DataField specified with the iterator.
Remarks:
A FormLayout utilizes user- or system DataField as place-holders for dynamic data. Values for such DataFields are usually provided by the user (entered manually in TFORMer Designer) or imported from a DataSource. Each DataField can be used on its own, as part of expressions (e.g. in a text- or bar-code element) or it may be computed within the FormLayout itself (e.g. pre- and post-expressions). This method queries the FormLayout and returns an enumeration (see EVarUsage) regarding the use of a specific DataField in the FormLayout.
Returns:
- The usage of the DataField in the current FormLayout. This value is only valid if peCode is ErrOk (0).
Parameters:
[in]
pInstance
The TFORMer-Instance provided by a previous call to TFormer_Init.