THPDFPreflightPluginEvaluate Type

THPDFPreflightPluginEvaluate = reference to function(
  const Context: THPDFPreflightPluginContext;
  out PluginResult: THPDFPreflightPluginResult;
  out ErrorMessage: AnsiString): Boolean;

評估無法安全完成時，傳回 False 並附上穩定的錯誤訊息