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LINECALLSTATUS structure (tapi.h)

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The LINECALLSTATUS structure describes the current status of a call. The information in this structure depends on the device capabilities of the address, the ownership of the call by the invoking application, and the current state of the call being queried. The lineGetCallStatus and TSPI_lineGetCallStatus functions return the LINECALLSTATUS structure.

Syntax

typedef struct linecallstatus_tag {
  DWORD      dwTotalSize;
  DWORD      dwNeededSize;
  DWORD      dwUsedSize;
  DWORD      dwCallState;
  DWORD      dwCallStateMode;
  DWORD      dwCallPrivilege;
  DWORD      dwCallFeatures;
  DWORD      dwDevSpecificSize;
  DWORD      dwDevSpecificOffset;
  DWORD      dwCallFeatures2;
#if ...
  SYSTEMTIME tStateEntryTime;
#else
  WORD       tStateEntryTime[8];
#endif
} LINECALLSTATUS, *LPLINECALLSTATUS;

Members

dwTotalSize

Total size allocated to this data structure, in bytes.

dwNeededSize

Size for this data structure that is needed to hold all the returned information, in bytes.

dwUsedSize

Size of the portion of this data structure that contains useful information, in bytes.

dwCallState

Current call state of the call using one of the LINECALLSTATE_ constants.

dwCallStateMode

Interpretation of the dwCallStateMode member is call-state-dependent. In many cases, the value will be zero. The following table shows dwCallStateMode types for a given dwCallState value.

dwCallState Meaning
LINECALLSTATE_BUSY

LINEBUSYMODE_ Constants
LINECALLSTATE_CONNECTED

LINECONNECTEDMODE_ Constants
LINECALLSTATE_DIALTONE

LINEDIALTONEMODE_ Constants
LINECALLSTATE_DISCONNECTED

LINEDISCONNECTMODE_ Constants
LINECALLSTATE_OFFERING

LINEOFFERINGMODE_ Constants
LINECALLSTATE_SPECIALINFO

LINESPECIALINFO_ Constants

dwCallPrivilege

Application's privilege for this call. This member uses one or more of the LINECALLPRIVILEGE_ constants.

dwCallFeatures

Flags that indicate the Telephony API functions that can be invoked on the call, given the availability of the feature in the device capabilities, the current call state, and call ownership of the invoking application. A zero indicates the corresponding feature cannot be invoked by the application on the call in its current state; a one indicates the feature can be invoked. This member uses LINECALLFEATURE_ Constants.

dwDevSpecificSize

Size of the device-specific field, in bytes.

dwDevSpecificOffset

Offset from the beginning of the structure to the variably sized device-specific field. The size of the field is specified by dwDevSpecificOffset.

dwCallFeatures2

Indicates additional functions can be invoked on the call, given the availability of the feature in the device capabilities, the current call state, and call ownership of the invoking application. An extension of the dwCallFeatures member. This member uses LINECALLFEATURE2_ Constants.

tStateEntryTime

Coordinated Universal Time at which the current call state was entered.

tStateEntryTime[8]

Coordinated Universal Time at which the current call state was entered.

Remarks

Device-specific extensions should use the DevSpecific (dwDevSpecificSize and dwDevSpecificOffset) variably sized area of this data structure.

The application is sent a LINE_CALLSTATE message whenever the call state of a call changes. This message only provides the new call state of the call. Additional status about a call is available with lineGetCallStatus.

The members dwCallFeatures2 and tStateEntryTime are available only to applications that open the line device with an API version of 2.0 or later.

Requirements

Requirement Value
Header tapi.h

See also

LINEDIALPARAMS

LINE_CALLSTATE

TSPI_lineGetCallStatus

lineGetCallStatus