Difference between revisions of "SDK Function Levels"
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Functions available at [[Overview of Level 3|level 3]] are low-level functions separated into the following category dependent usage. | Functions available at [[Overview of Level 3|level 3]] are low-level functions separated into the following category dependent usage. | ||
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Revision as of 13:26, 30 March 2009
The API (Applications Programming Interface) provides a library of 'C' functions that are divided into four different levels.
Level 1
Functions available at level 1 are for use with parameter passing between Recital and your C function. These are used to check the type and number of parameters passed and to convert Recital data types to C data types. A 'C' UDF which uses the RECITAL/API can have a variable number of parameters passed to it from Recital. For example:
store "RECITAL" to m_string store 7.0 to m_value m_result = dbapi_udf ( m_string, m_value)
Level 2
Functions available at level 2 are high-level functions used to execute RECITAL commands and evaluate expressions.
Level 3
Functions available at level 3 are low-level functions separated into the following category dependent usage.
| TYPE | DESCRIPTION |
|---|---|
| ARRAY | Recital array access |
| BLOB | Operations on binary large objects |
| CHARACTER | Character string functions |
| CURRENCY | Currency functions |
| DATE | Date, datetime and time functions |
| DBF | Database I/O operations |
| FIELD | Field I/O operations |
| MEMO | Memo I/O operations |
| MEMVAR | Recital memory variable operations |
Level 4
Functions available at [[Overview of Level 4|level 4] are for use with building classes and managing objects.
