This structure contains communication device data. This structure is filled by the ClearCommError function.
At a Glance
| Header file: | Winbase.h |
| Windows CE versions: | 1.0 and later |
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
Specifies if the transmission is waiting to receive the CTS (Clear to Send) signal. If this member is TRUE, the transmission is waiting.
fDsrHold
Specifies if the transmission is waiting to receive the DSR (Data Set Ready) signal. If this member is TRUE, the transmission is waiting.
fRlsdHold
Specifies if the transmission is waiting to receive the RLSD (Receive Line Signal Detect) signal. If this member is TRUE, the transmission is waiting.
fXoffHold
Specifies if the transmission is waiting because the XOFF character was received. If this member is TRUE, the transmission is waiting.
fXoffSent
Specifies if the transmission is waiting because the XOFF character was transmitted. If this member is TRUE, the 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 if 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 communication device by way of the TransmitCommChar function. The communication 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