请大师帮助：开仓时显示一个大箭头，平仓时也显标一个相反方向的大箭头，如何写代码？

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请大师给出一段代码！感谢！

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ObjectCreate("myx" + DoubleToStr(g_count_188, 0), OBJ_TEXT, 0, Time[0], High[0] + 5.0 * l_point_0);
ObjectSetText("myx" + DoubleToStr(g_count_188, 0), "S", 15, "Arial", Red);