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COMSTAT info  Overview  Group

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 12:20, local time: 2022/5/27 06:29,
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