Language Environment Interface Reference

Processing Input Parameters

The Net.Data language environments use the dtw_execute() interface to receive and process parameters. The dtw_execute() interface works with the dtw_lei_t structure, which is used by Net.Data to communicate with the language environment. Use the following recommendations for input parameter processing, when writing your language environment.

• Specify any implicit parameters in the ENVIRONMENT statement for the language environment, in the Net.Data initialization file. Net.Data passes the parameters specified here on all function calls to the language environment after it passes the parameters specified by the macro writer on the FUNCTION block being executed.
• Receive input parameters to the dtw_execute() interface as part of the dtw_lei_t structure. The macro writer determines the order that Net.Data passes the parameters when specifying them in the FUNCTION block definition of the Net.Data macro.

The processInputParms() routine in the program template, in Appendix B, Language Environment Template shows one method of processing input parameters.