COMSTAT

3.1 

typedef struct tagCOMSTAT {   /* cmst                            */
    BYTE status;              /* status of transmission          */
    UINT cbInQue;             /* count of characters in Rx Queue */
    UINT cbOutQue;            /* count of characters in Tx Queue */
} COMSTAT;

The COMSTAT structure contains information about a communications device.

Members

status

Specifies the status of the transmission. This member can be one or more of the following flags:

Flag Meaning

CSTF_CTSHOLD Specifies whether transmission is waiting for the CTS (clear-to-send) signal to be sent.
CSTF_DSRHOLD Specifies whether transmission is waiting for the DSR (data-set-ready) signal to be sent.
CSTF_RLSDHOLD Specifies whether transmission is waiting for the RLSD (receive-line-signal-detect) signal to be sent.
CSTF_XOFFHOLD Specifies whether transmission is waiting as a result of the XOFF character being received.
CSTF_XOFFSENT Specifies whether transmission is waiting as a result of the XOFF character being transmitted. Transmission halts when the XOFF character is transmitted and used by systems that take the next character as XON, regardless of the actual character.
CSTF_EOF Specifies whether the end-of-file (EOF) character has been received.
CSTF_TXIM Specifies whether a character is waiting to be transmitted.

cbInQue

Specifies the number of characters in the receive queue.

cbOutQue

Specifies the number of characters in the transmit queue.

See Also

GetCommError