char ErrorChar; // error replacement character char EofChar; // end of input character char EvtChar; // received event character WORD wReserved1; // reserved; do not use } DCB; 读写串口
值 事件描述 EV_BREAK A break was detected on input. EV_CTS The CTS (clear-to-send) signal changed state. EV_DSR The DSR(data-set-ready) signal changed state. EV_ERR A line-status error occurred. Line-status errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY. EV_RING A ring indicator was detected. EV_RLSD The RLSD (receive-line-signal-detect) signal changed state. EV_RXCHAR A character was received and placed in the input buffer. EV_RXFLAG The event character was received and placed in the input buffer. The event character is specified in the device's DCB structure, which is applied to a serial port by using the SetCommState function. EV_TXEMPTY The last character in the output buffer was sent. 在设置好事件掩模后，我们就可以利用WaitCommEvent()函数来等待串口上发生事件，其函数原型为：
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