The MODEMDEVCAPS structure contains information about the capabilities of a modem.
typedef struct modemdevcaps_tag {
DWORD dwActualSize; // size of returned data, in bytes
DWORD dwRequiredSize; // total size of structure
DWORD dwDevSpecificOffset; // offset of provider-defined data
DWORD dwDevSpecificSize; // size of provider-defined data
// Product and version identification
DWORD dwModemProviderVersion; // provider version number
DWORD dwModemManufacturerOffset; // offset of manufacturer name
DWORD dwModemManufacturerSize; // length of manufacturer name
DWORD dwModemModelOffset; // offset of model name
DWORD dwModemModelSize; // length of model name
DWORD dwModemVersionOffset; // offset of version name
DWORD dwModemVersionSize; // length of version name
// Local option capabilities
DWORD dwDialOptions; // bitmap of supported values
DWORD dwCallSetupFailTimer; // maximum in seconds
DWORD dwInactivityTimeout; // maximum in tenths of seconds
DWORD dwSpeakerVolume; // bitmap of supported values
DWORD dwSpeakerMode; // bitmap of supported values
DWORD dwModemOptions; // bitmap of supported values
DWORD dwMaxDTERate; // maximum value in bit/s
DWORD dwMaxDCERate; // maximum value in bit/s
// Variable portion for strings and provider-specific data
BYTE abVariablePortion [1]; // variable-length data
} MODEMDEVCAPS, *PMODEMDEVCAPS, *LPMODEMDEVCAPS;
Value |
Meaning |
DIALOPTION_DIALBILLING |
Specifies that the modem supports waiting for billing tone (bong). |
DIALOPTION_DIALQUIET |
Specifies that the modem supports waiting for quiet. |
DIALOPTION_DIALDIALTONE |
Specifies that the modem supports waiting for a dial tone. |
Value |
Meaning |
MDMVOLFLAG_LOW |
The modem supports low (MDMVOL_LOW) volume. |
MDMVOLFLAG_MEDIUM |
The modem supports medium (MDMVOL_MEDIUM) volume. |
MDMVOLFLAG_HIGH |
The modem supports high (MDMVOL_HIGH) volume. |
Value |
Meaning |
MDMSPKRFLAG_OFF |
The modem supports the MDMSPKR_OFF speaker mode. |
MDMSPKRFLAG_DIAL |
The modem supports the MDMSPKR_DIAL speaker mode. |
MDMSPKRFLAG_ON |
The modem supports the MDMSPKR_ON speaker mode. |
MDMSPKRFLAG_CALLSETUP |
The modem supports the MDMSPKR_CALLSETUP speaker mode. |
MDM_BLIND_DIAL |
MDM_FLOWCONTROL_SOFT |
MDM_CCITT_OVERRIDE |
MDM_FORCED_EC |
MDM_CELLULAR |
MDM_SPEED_ADJUST |
MDM_COMPRESSION |
MDM_TONE_DIAL |
MDM_ERROR_CONTROL |
MDM_V23_OVERRIDE |
MDM_FLOWCONTROL_HARD |
When MODEMDEVCAPS is used to set modem options, as part of the MODEMSETTINGS structure, these values are used as follows:
Value |
Meaning |
MDM_CCITT_OVERRIDE |
When set, CCITT modulations are enabled for V.21 and V.22 or V.23. When clear, bell modulations are enabled for 103 and 212A. |
MDM_V23_OVERRIDE |
When set, CCITT modulations are enabled for V.23. When clear, CCITT modulations are enabled for V.21 and V.22. |
For V.23 to be set, both MDM_CCITT_OVERRIDE and MDM_V23_OVERRIDE must be set.
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