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Windows NT
Yes
Win95
Yes
Win32s
No
Import Library
kernel32.lib
Header File
winbase.h
Unicode
No
Platform Notes
None

GetCommModemStatus

The GetCommModemStatus function retrieves modem control-register values.

BOOL GetCommModemStatus(

HANDLE hFile,
// handle of communications device
LPDWORD lpModemStat
// address of control-register values
);

Parameters

hFile

Identifies the communications device. The CreateFile function returns this handle.

lpModemStat

Points to a 32-bit variable that specifies the current state of the modem control-register values. This parameter can be a combination of the following values:

Value
Meaning
MS_CTS_ON
The CTS (clear-to-send) signal is on.
MS_DSR_ON
The DSR (data-set-ready) signal is on.
MS_RING_ON
The ring indicator signal is on.
MS_RLSD_ON
The RLSD (receive-line-signal-detect) signal is on.

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, call GetLastError.

Remarks

The GetCommModemStatus function is useful when you are using the WaitCommEvent function to monitor the CTS, RLSD, DSR, or ring indicator signals. To detect when these signals change state, use WaitCommEvent and then use GetCommModemStatus to determine the state after a change occurs.

The function fails if the hardware does not support the control-register values.

See Also

CreateFile
, WaitCommEvent

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