Field
Field ( tableNum ; fieldNum ) -> fieldPtr
Field ( fieldPtr ) -> fieldNum
| Parameter | Type | Description | |
|---|---|---|---|
| tableNum | Integer | → | Table number |
| fieldNum | Integer | → | Field number |
| fieldPtr | Pointer | ← | Field pointer |
| Field ( fieldPtr ) -> fieldNum | |||
| Parameter | Type | Description | |
| fieldPtr | Pointer | → | Field pointer |
| fieldNum | Integer | ← | Field number |
Description
The Field command has two forms:
- If you pass a table number in tableNum and a field number in fieldNum, Field returns a pointer to the field.
- If you pass a field pointer in fieldPtr, Field returns the field number of the field.
Example 1
The following example sets the fieldPtr variable to a pointer to the second field in the third table:
FieldPtr:=Field(3;2)
Example 2
Passing fieldPtr (a pointer to the second field of a table) to Field returns the number 2. The following line sets FieldNum to 2:
FieldNum:=Field(FieldPtr)
Example 3
The following example sets the FieldNum variable to the field number of [Table3]Field2:
FieldNum:=Field(->[Table3]Field2)