| Input Parameters | Significance |
| DtvLong idf | field Id |
| DtvLong row | row position in the field |
| Output Parameters | Significance |
| DtvLong *num | integer |
| Return Code | Significance |
| 0 | no error |
| -1 | field Id is NULL |
| 1 | wrong row position |
| 3 | wrong field type |
You can only apply the function to fields of the types integer, string, and calculate.