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Exemplo: 

oQrCode:Refresh()

Exemplo:

#INCLUDE "PROTHEUS.CH"

//Consulte: http://tdn.totvs.com.br/display/mp/FwQrCode
User Function TstQrCode()
Local oDLG := Nil
Local cCodigo := "http://www.totvs.com.br" + Space(60)
Private oQrCode

//Cria a Dialog
DEFINE MSDIALOG oDlg TITLE "RDMAKE para teste da classe FwQrCode" FROM 0,0 TO 400,800 PIXEL

//Cria o objeto FwQrCode
oQrCode := FwQrCode():New({25,25,200,200},oDlg,cCodigo)

//Get com o codigo exibido
@25,150 GET oGet VAR cCodigo OF oDlg SIZE 200,10 PIXEL

//Botao Gerar
@45,150 BUTTON "Gerar" SIZE 30,20 PIXEL OF oDlg ACTION MsgRun("Gerando QRCode","Aguarde",{|| MyRefresh(cCodigo)}) PIXEL

//Exibe a Dialog em Video
ACTIVATE MSDIALOG oDlg CENTERED

Return

Function MyRefresh(cNewCod)
oQrCode:SetCodeBar(cNewCod)
oQrCode:Refresh()
Return