COMSTAT structure (winbase.h)
Contains information about a communications device. This structure is filled by the ClearCommError function.
Syntax
typedef struct _COMSTAT {
DWORD fCtsHold : 1;
DWORD fDsrHold : 1;
DWORD fRlsdHold : 1;
DWORD fXoffHold : 1;
DWORD fXoffSent : 1;
DWORD fEof : 1;
DWORD fTxim : 1;
DWORD fReserved : 25;
DWORD cbInQue;
DWORD cbOutQue;
} COMSTAT, *LPCOMSTAT;
Members
fCtsHold
If this member is TRUE, transmission is waiting for the CTS (clear-to-send) signal to be sent.
fDsrHold
If this member is TRUE, transmission is waiting for the DSR (data-set-ready) signal to be sent.
fRlsdHold
If this member is TRUE, transmission is waiting for the RLSD (receive-line-signal-detect) signal to be sent.
fXoffHold
If this member is TRUE, transmission is waiting because the XOFF character was received.
fXoffSent
If this member is TRUE, transmission is waiting because the XOFF character was transmitted. (Transmission halts when the XOFF character is transmitted to a system that takes the next character as XON, regardless of the actual character.)
fEof
If this member is TRUE, the end-of-file (EOF) character has been received.
fTxim
If this member is TRUE, there is a character queued for transmission that has come to the communications device by way of the TransmitCommChar function. The communications device transmits such a character ahead of other characters in the device's output buffer.
fReserved
Reserved; do not use.
cbInQue
The number of bytes received by the serial provider but not yet read by a ReadFile operation.
cbOutQue
The number of bytes of user data remaining to be transmitted for all write operations. This value will be zero for a nonoverlapped write.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP |
| Minimum supported server | Windows Server 2003 |
| Header | winbase.h (include Windows.h) |