Question

In Delphi XE2, we have use

{$ifdef Win32}
{$ifdef Win64}

to identify which platform we are in.

Is there any predefined conditional that may identify VCL and FMX?

Answer 1

As others says, there is not a conditional directive to determine if your application is VCL or FireMonkey. I think the most reliable way to determine if your app is FireMonkey or VCL is using a function instead of a conditional directive.

Something like

Uses
 Rtti;

function IsVCLApp:Boolean;
begin
 Result:= CompareText(TRttiContext.Create.GetType(TApplication.ClassInfo).QualifiedName,'Vcl.Forms.TApplication')=0;
end;

function IsFireMonkeyApp:Boolean;
begin
 Result:= CompareText(TRttiContext.Create.GetType(TApplication.ClassInfo).QualifiedName,'FMX.Forms.TApplication')=0;
end;