有两种方法可以打开串口，一种是同步方式（NonOverlapped），另外一
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In most cases, this architecture works very well. This is especially true for applications that use traditional socket paradigms with nonoverlapped sends and receives.
多数情况下，这样的架构运行良好，特别在是应用程序采用传统的套接字下非重叠的send()和receive()模式编写的时候。
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