ENVITaskFromProcedure::PreExecute
The PreExecute method is called first when ENVITask::Execute runs. It performs the following actions:
- Resets all output parameters to !NULL.
- Updates input parameter values from keywords set on ENVITask::Execute.
- Generates temporary files and folders for input ENVIURI and ENVIVirtualizableURI parameters, if not set by the end user.
- Verifies that input URI parameters that generate output have write permissions and do not already exist.
- Validates that all required input parameters are set.
Syntax
In most cases, the PreExecute method is called by ENVITask::Execute. The only time it should be called explicitly is when a base class other than ENVITaskFromProcedure overrides ENVITask::Execute. When called explicitly, the syntax is as follows:
Obj -> [ENVITaskFromProcedure::]PreExecute, _REF_EXTRA=refExtra
Routine Signature
To overload an object class in order to add more functionality to PreExecute, implement a method with the following signature:
PRO class::PreExecute, _REF_EXTRA=refExtra
Version History
|
ENVI 5.2. 1 |
Introduced |
API Version
4.2