BOOL SetCommMask(
HANDLE hFile, //标识通信端口的句柄
DWORD dwEvtMask //能够使能的通信事件
);
串口上可能发生的事件如下表所示：
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.
EV_RXCHAR:接收到一个字节并放入输入缓冲区。
EV_RXFLAG:接收到事件字符放入输入缓冲区。