写在下面的函数里

procedure CurStepChanged(CurStep: TSetupStep);

 

 

if_need_vc_x64 := NeedInstallVC8SP1_x64(); if (CurStep=ssInstall) and (if_need_vc_x64) then begin  ExtractTemporaryFile('vc_redist.x64.exe');  Exec(ExpandConstant('{tmp}/vc_redist.x64.exe'), '/qb', '', SW_SHOW, ewWaitUntilTerminated, ResultCode);  if not (ResultCode = 0)   then begin    MsgBox('VC++ 2015 Redistributable which is mandatory!',mbCriticalError, MB_OK)        end; end;