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MODEMSETTINGS structure

Applies to: desktop apps only

Contains information about a modem's configuration.

Syntax

Copy

typedef struct modemsettings_tag {
  DWORD dwActualSize;
  DWORD dwRequiredSize;
  DWORD dwDevSpecificOffset;
  DWORD dwDevSpecificSize;
  DWORD dwCallSetupFailTimer;
  DWORD dwInactivityTimeout;
  DWORD dwSpeakerVolume;
  DWORD dwSpeakerMode;
  DWORD dwPreferredModemOptions;
  DWORD dwNegotiatedModemOptions;
  DWORD dwNegotiatedDCERate;
  BYTE  abVariablePortion[1];
} MODEMSETTINGS, *PMODEMSETTINGS, *LPMODEMSETTINGS;

Members

dwActualSize

The size of the data actually returned to the application, in bytes. This member may be less than the dwRequiredSize member if an application did not allocate enough space for the variable-length portion of the structure.

dwRequiredSize

The number of bytes required for the entire MODEMDEVCAPS structure, including the variable-length portion.

dwDevSpecificOffset

The offset of the provider-defined portion of the structure, in bytes relative to the beginning of the structure.

dwDevSpecificSize

The size of the provider-defined portion of the structure, in bytes.

dwCallSetupFailTimer

The maximum number of seconds the modem should wait, after dialing is completed, for an indication that a modem-to-modem connection has been established. If a connection is not established in this interval, the call is assumed to have failed. This member is equivalent to register S7 in Hayes® compatible modems.

dwInactivityTimeout

The maximum number of seconds of inactivity allowed after a connection is established. If no data is either transmitted or received for this period of time, the call is automatically terminated. This time-out is used to avoid excessive long-distance charges or online service charges if an application unexpectedly locks up or the user leaves.

dwSpeakerVolume

The volume level of the monitor speaker when the speaker is on. This member can be one of the following values.

Value	Meaning
MDMVOL_HIGH 0x00000002	High volume.
MDMVOL_LOW 0x00000000	Low volume.
MDMVOL_MEDIUM 0x00000001	Medium volume.

The MODEMDEVCAPS structure specifies the speaker volumes a modem supports. Actual volumes are hardware-specific.

dwSpeakerMode

The speaker mode. This member can be one of the following values.

Value	Meaning
MDMSPKR_CALLSETUP 0x00000008	The speaker is on until a connection is established.
MDMSPKR_DIAL 0x00000002	The speaker is on until a connection is established, except that it is off while the modem is actually dialing.
MDMSPKR_OFF 0x00000001	The speaker is always off.
MDMSPKR_ON 0x00000004	The speaker is always on.

dwPreferredModemOptions

The modem options requested by the application. The local and remote modems negotiate modem options during call setup; this member specifies the initial negotiating position of the local modem.

The dwModemOptions member of the MODEMDEVCAPS structure specifies the modem options supported by the local modem. For a list of modem options, see the description of the MODEMDEVCAPS structure.

dwNegotiatedModemOptions

The modem options that are actually in effect. This member is filled in after a connection is established and the local and remote modems negotiate modem options.

dwNegotiatedDCERate

The DCE rate in effect. This member is filled in after a connection is established and the local and remote modems negotiate modem modulations.

abVariablePortion

Optional provider-defined information.

Requirements

Minimum supported client	Windows XP
Minimum supported server	Windows Server 2003
Header	Mcx.h (include Windows.h)

MODEMSETTINGS structure

Syntax

Members

Requirements

See also