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The COMSTAT structure contains information about a communications
device. This structure is filled by the ClearCommError
function.
typedef struct _COMSTAT { // cst
DWORD fCtsHold : 1; // Tx waiting for CTS signal
DWORD fDsrHold : 1; // Tx waiting for DSR signal
DWORD fRlsdHold : 1; // Tx waiting for RLSD signal
DWORD fXoffHold : 1; // Tx waiting, XOFF char rec'd
DWORD fXoffSent : 1; // Tx waiting, XOFF char sent
DWORD fEof : 1; // EOF character sent
DWORD fTxim : 1; // character waiting for Tx
DWORD fReserved : 25; // reserved
DWORD cbInQue; // bytes in input buffer
DWORD cbOutQue; // bytes in output buffer
} COMSTAT, *LPCOMSTAT;
Members
-
fCtsHold
-
Specifies whether transmission is waiting for the CTS (clear-to-send) signal
to be sent. If this member is TRUE, transmission is waiting.
-
fDsrHold
-
Specifies whether transmission is waiting for the DSR (data-set-ready) signal
to be sent. If this member is TRUE, transmission is waiting.
-
fRlsdHold
-
Specifies whether transmission is waiting for the RLSD
(receive-line-signal-detect) signal to be sent. If this member is TRUE,
transmission is waiting.
-
fXoffHold
-
Specifies whether transmission is waiting because the XOFF character was
received. If this member is TRUE, transmission is waiting.
-
fXoffSent
-
Specifies whether transmission is waiting because the XOFF character was
transmitted. If this member is TRUE, transmission is waiting. Transmission
halts when the XOFF character is transmitted to a system that takes the next
character as XON, regardless of the actual character.
-
fEof
-
Specifies whether the end-of-file (EOF) character has been received. If this
member is TRUE, the 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
-
Specifies the number of bytes received by the serial provider but not yet read
by a ReadFile operation.
-
cbOutQue
-
Specifies the number of bytes of user data remaining to be transmitted for all
write operations. This value will be zero for a nonoverlapped write.
See Also
ClearCommError, ReadFile,
TransmitCommChar
file: /Techref/os/win/api/win32/struc/src/str02_6.htm, 3KB, , updated: 2000/4/7 11:20, local time: 2024/12/24 04:49,
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