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     Logger是BOpenlive SDK的调试输出工具，主要用于文本内容输出。
     </td></tr><tr class="prow1"><td class="summaryTablePaddingCol">&nbsp;</td><td class="summaryTableSecondCol"><a href="SignUtility.html">SignUtility</a>&nbsp;<img src="../../images/AirIcon12x12.gif" width="12" height="12" hspace="0" vspace="0" alt="AIR-only" title="Only available in the AIR runtime"></td><td class="su