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GetCommMask info  Overview  Group

The GetCommMask function retrieves the value of the event mask for a specified communications device.

BOOL GetCommMask(

    HANDLE hFile,

// handle of communications device

    LPDWORD lpEvtMask

// address of variable to get event mask

   );

Parameters

hFile
Identifies the communications device. The CreateFile function returns this handle.
lpEvtMask
Points to the 32-bit variable to be filled with a mask of events that are currently enabled. This parameter can be one or more of the following values:

Value

Meaning

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_EVENT1

An event of the first provider-specific type occured.

EV_EVENT2

An event of the second provider-specific type occured.

EV_PERR

A printer error occured.

EV_RING

A ring indicator was detected.

EV_RLSD

The RLSD (receive-line-signal-detect) signal changed state.

EV_RX80FULL

The receive buffer is 80 percent full.

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.

Return Values

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.

Remarks

The GetCommMask function uses a 32-bit mask variable to indicate 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 modify the event mask of a communications resource, use the SetCommMask function.

See Also

CreateFile, DCB, SetCommMask, WaitCommEvent,

 

See also:


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