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XSharpLoadLibrary Function (RT)

Year Function (RT)

FieldGet Function

Get the contents of a field that is identified by its position.

Namespace: XSharp.RT
Assembly: XSharp.RT (in XSharp.RT.dll) Version: 2.19

Syntax

Copy

 FUNCTION FieldGet(
	nFieldPos
) AS USUAL CLIPPER

[ClipperCallingConventionAttribute(new string[] { ... })]
public static Usual FieldGet(
	Usual nFieldPos = default
)

Request Example View Source

Parameters

nFieldPos (Optional): Type: Usual
The position of the field in the database file structure for the current work area.

Return Value

Type: Usual
The value of the specified field.
If nFieldPos does not correspond to the position of any field in the current database file, FieldGet() will generate a runtime error. Only in the Xbase++ dialect a NIL will be returned.

Remarks

FieldGet() retrieves the value of a field using its position within the database file structure rather than its field name. Within generic database service functions this allows, among other things, the retrieval of field values without use of the macro operator.

Tip
FieldGet() can be used with a BLOB field (that is, a memo field associated with a BLOB file), provided the length of the field does not exceed 64 KB. For BLOB fields longer than 64 KB, use the BLOBGet() function instead.

Examples

This example compares FieldGet() to functionally equivalent code that uses the macro operator to retrieve the value of a field:

Copy

1LOCAL nFieldPos := 1, FName, FVal
2USE customer NEW
3                                // Using macro operator
4FName := FIELDNAME(nFieldPos)            // Get field name
5FVal := &FName                        // Get field value
6                                // Using FieldGet()
7FVal := FieldGet(nFieldPos)                // Get field value

Reference

Functions, Globals and Defines

XSharp.RT Namespace

BLOBGet(Usual, Usual, Usual)

FieldGetSym(Symbol)

FieldPut(Usual, Usual)

FieldPutSym(Symbol, Usual)

VoDbFieldGetBytes(DWord, Byte)