VC+MapX问题（如何改变TrueType字体大小，附代码）请教

<P> CMapXStyle ftrStyle = m_ctrlMapX.GetLayers().Item("Outlets").GetStyle();
      //"ftrStyle" holds the style of the feature for the
      CY fontSize;
  fontSize.int64=64;
  ftrStyle.SetSymbolType(0);
  ftrStyle.GetSymbolFont().SetName("plao1");//plao1.ttf
  ftrStyle.SetSymbolCharacter(52); //Changes the symbol to a warehouse
  ftrStyle.SetSymbolFontColor(255); //Changes the color of the symbol to red
  ftrStyle.GetSymbolFont().SetSize(fontSize); //Changes the symbol font size</P>
<P>上述代码运行不正常，怎样修改TRUETYPE字体复好的大小？
</P>