11.4. Getting Communications Events
The communications functions provide a way to detect certain communications events, and these events can improve the responsiveness of your programs. We can improve on Listing 11.1 to some degree by using an event character.
The API is able to sense any of the following events:
| EV_BREAK | Break was sent in the input |
| EV_CTS | The CTS line changed |
| EV_DSR | The DSR line changed |
| EV_ERR | An error was detected: CE_FRAME, CE_OVERRUN, and CE_RXPARITY are possible |
| EV_RING | The modem sensed a ring |
| EV_RLSD | The DCD line changed |
| EV_RXCHAR | A character was received |
| EV_RXFLAG | The special event character (as indicated by the EvtChar field in the DCB) was received |
| EV_TXEMPTY | The last character of the last WriteFile operation was sent |
The event most ...
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