function specifies a set of events to be monitored for a communications
| HANDLE hFile,
||// handle of communications device
| DWORD dwEvtMask
||// mask that identifies enabled events
Identifies the communications device. The CreateFile
function returns this handle.
Specifies the events to be enabled. A value of zero disables all events. This
parameter can be a combination of the following values:
||A break was detected on input.
||The CTS (clear-to-send) signal changed state.
||The DSR (data-set-ready) signal changed state.
||A line-status error occurred. Line-status errors are CE_FRAME, CE_OVERRUN, and
||A ring indicator was detected.
||The RLSD (receive-line-signal-detect) signal changed state.
||A character was received and placed in the input buffer.
||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.
||The last character in the output buffer was sent.
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error
information, call GetLastError
function specifies the set of events that can be monitored for a particular
communications resource. A handle to the communications resource can be
specified in a call to the WaitCommEvent
function, which waits for one of the events to occur. To get the current
event mask of a communications resource, use the GetCommMask
is called for a communications resource while an overlapped wait is pending
for that resource, WaitCommEvent
returns an error.
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