我希望在编译FMX或VCL时,在uses
子句中使用不同的单位列表。在下面的代码中,我试图测试FireMonkeyVersion
,这在FMX项目中有效(label1.Text
为“FMX”)。当我将$IF语句移动到uses
子句中时,会出现错误消息([dcc32 Error] fmx_text.pas(7): E2026 Constant expression expected
)。是否有任何方法实现所需的条件编译?
unit fmx_text;
interface
uses
System.SysUtils, System.Types, System.UITypes, System.Rtti, System.Classes,
System.Variants, FMX.Controls, FMX.Forms, FMX.Dialogs, FMX.Types;
{$IF FireMonkeyVersion >= 16}
{$DEFINE HAS_FMX}
{$ELSE}
{$DEFINE HAS_VCL}
{$IFEND}
type
TForm2 = class(TForm)
Label1: TLabel;
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form2: TForm2;
implementation
{$R *.fmx}
procedure TForm2.FormCreate(Sender: TObject);
begin
label1.Text := 'Undefined';
{$IFDEF HAS_FMX}
label1.Text := 'FMX';
{$ENDIF}
{$IFDEF HAS_VCL}
label1.Text := 'VCL';
{$ENDIF}
end;
end.