Set Actionlist Enabled Property to True

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1

I store in a table the name of my actions, and dynamically through a query, I return them on screen, as follows:

declare a variable of type:

MinhaACL : TAction;

Begin
   MinhaACL := TAction(qryActions.FieldByName('nomeacl').Asstring);
   MinhaACL.Enabled := True;
End;

But when I try to Enable it, the system shows the following error:

Access Violation at address 3B90C301 in module 'Betterfuell.exe'. Read of address 3B90C301

Is there any other way I can do that? If someone can give me a Light.

OBS: And I’ve tried to put it like this

MinhaACL := TAction('NomeDaMinhaACL'); 
MinhaACL.Enabled := True;
delphi actions

  • No, I’ve already tested, she’s returning the data. Dei um Showmessage(qryActions.Fieldbyname('nomecl').Asstring) and returns the data correctly. E already tried to put it like this Minhaacl := Taction('Name daminhaacl'); Minhaacl.Enabled := True; E returns with the same error

  • You’re trying to convert a string to a Taction object... of course it’s a mistake. You need to use the string to search for the action, maybe for the components of your form, for example.

  • @Tiago-Rodrigues, you would have an example of how to locate an action through a string ?

2 answers

2

The problem is that Voce has the name of the action but cannot directly convert it to a Taction type Object. Assuming your Actions are inside a Tactionlist (correct me if I’m wrong), you can make a function to receive the name of a Taction, loop the Tactionlist and return the Taction that has the desired name. Something like

function FindActionByName(SearchName:String;ActionList:TActionList):TAction;
var
  at:TAction;
  a: Integer;
begin
  result:=nil;
  for a := 0 to ActionList.ActionCount-1 do
    if ActionList[a].Name=SearchName then
    begin
      result:= TAction(ActionList[a]);
      break;
    end;
end;

  • Thanks, gave it right here @Tiago-Rodrigues.

1

Complete code as help received:

procedure TMainForm.ValidaFormsLiberados;
var
 // Declarei as variáveis necessárias
  ArrQtdReg : Array of string;
  Registros, i, a: Integer;
  ChaveACL : string;
begin
  // Buscando Registros na minha query
  with qryPermitidos do
    begin
      Close;
      Open;
      Last;
      First;
    end;

  with qryFormsLocate do
    begin
      Close;
      Open;
    end;

    // Contando Registros
    Registros := qryPermitidos.RecordCount;
    SetLength(ArrQtdReg, Registros);

    // Desativando todas as minhas Actions
    for a := 0 to aclMenuPrincipal.ActionCount-1 do
      begin
        TCustomAction(aclMenuPrincipal.Actions[a]).Visible := False;
      end;


    // Liberando somente as Actions cadastradas na minha Query

    for I := 1 to Registros do
      begin
          ChaveACL          := qryPermitidosform_actionlist.AsString;
          ArrQtdReg[I]      := 'String '+ChaveACL;
          qryPermitidos.Next;

          for a := 0 to aclMenuPrincipal.ActionCount-1 do
            if aclMenuPrincipal[a].Name=ChaveACL then
            begin
              TCustomAction(aclMenuPrincipal.Actions[a]).Visible := True;
              break;
            end;
      end;

end;

Then I only called my prior when creating my main form.

Thanks to Tiago Rodrigues for his help.

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