怎樣讀取串口每個引腳的值

COMSTAT

The COMSTAT structure contains information about a communications device. This structure is filled by theClearCommError function.

typedef struct _COMSTAT { 
 DWORD fDsrHold  :1;  
DWORD fXoffHold  :1;  
DWORD fEof  :1;  DWORD fReserved  :25;  
DWORD cbOutQue;
} COMSTAT, *LPCOMSTAT;

Parameters

hFile

[in] Handle to the communications device. The CreateFile function returns this handle.

lpErrors

[out] Pointer to a variable to be filled with a mask indicating the type of error. This parameter can be one or more of the following values.

Value	Meaning
CE_BREAK	The hardware detected a break condition.
CE_DNS	Windows Me/98/95: A parallel device is not selected.
CE_FRAME	The hardware detected a framing error.
CE_IOE	An I/O error occurred during communications with the device.
CE_MODE	The requested mode is not supported, or the hFile parameter is invalid. If this value is specified, it is the only valid error.
CE_OOP	Windows Me/98/95: A parallel device signaled that it is out of paper.
CE_OVERRUN	A character-buffer overrun has occurred. The next character is lost.
CE_PTO	Windows Me/98/95: A time-out occurred on a parallel device.
CE_RXOVER	An input buffer overflow has occurred. There is either no room in the input buffer, or a character was received after the end-of-file (EOF) character.
CE_RXPARITY	The hardware detected a parity error.
CE_TXFULL	The application tried to transmit a character, but the output buffer was full.

lpStat

[out] Pointer to a COMSTAT structure in which the device's status information is returned. If this parameter is NULL, no status information is returned.

Return Values

If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, callGetLastError.

Remarks

If a communications port has been set up with a TRUE value for the fAbortOnError member of the setupDCB structure, the communications software will terminate all read and write operations on the communications port when a communications error occurs. No new read or write operations will be accepted until the application acknowledges the communications error by calling the ClearCommError function.
The ClearCommError function fills the status buffer pointed to by thelpStat parameter with the current status of the communications device specified by the hFile parameter.
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