Field

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4D v17.4

Field


Field ( tableNum ; fieldNum ) -> fieldPtr

Parameter	Type	Description
tableNum	Longint	Table number
fieldNum	Longint	Field number
fieldPtr	Pointer	Field pointer

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.

The following example sets the fieldPtr variable to a pointer to the second field in the third table:

FieldPtr:=Field(3;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)

The following example sets the FieldNum variable to the field number of [Table3]Field2:

FieldNum:=Field(->[Table3]Field2)