Entry points in MVC routines

Overview

The standard MVC entry point is a User Function named after the Model ID and receives an array: object [1], event [2] and form/submodel [3]. Extra arguments vary by event. MODELPOS needs logical; BUTTONBAR needs a structured array. MODELCOMMITTTS runs after full persistence inside the transaction; MODELCOMMITNTTS after persistence outside it, with no expected return. TOTVS notes MODELPOS can run for validation and the model event: do not assume a single call. The community sample demonstrates dispatch but its commit description differs from the official table; the latter is authoritative. (Sources: refs. 1–3.)

Syntax

PARAMIXB = {oObject,cEvent,cForm,...}

Commented example

#Include "Protheus.ch"

User Function Ed573()
    Local aEnvelope := {Nil,"MODELPOS","EDMASTER"}
    // Synthetic envelope: not a universal entry-point implementation.
    If Len(aEnvelope) >= 3
        If ValType(aEnvelope[2]) == "C"
            ConOut(aEnvelope[2])
        EndIf
    EndIf
Return Nil

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