# nccGetLineStatus

Retrieves a snapshot of the port status and stores it in an NCC_LINE_STATUS structure.

#### Prototype

DWORD nccGetLineStatus ( CTAHD linehd, NCC_LINE_STATUS *linestatus, unsigned linestatussize, NCC_CALLHD callhd[], unsigned callhdsize )

Argument | Description
linehd | Line handle used to open the NCC service instance.
linestatus | A pointer to the NCC_LINE_STATUS structure to receive the information: typedef struct { DWORD size; /* No of bytes written to by linestatus */ DWORD state; /* Current state of line */ DWORD pendingcmd; /* Last command not ack'd by board */ char protocol[NCC_MAX_PNAME+1]; /* Array of protocols on line */ CTA_MVIP_ADDR port; /* MVIP address of port */ unsigned numcallhd; /* Number of unreleased call handles */ } NCC_LINE_STATUS; See the Details section for field descriptions.
linestatussize | The amount of memory available at status. This value must be large enough to receive the NCC_LINE_STATUS size return value.
callhd | An array of call handles to be set to the values of calls on this line that have not been released. Set this value to NULL if you do not want to get a list of all the call handles on the line.
callhdsize | The size in bytes of the callhd array. This value is ignored if callhd is NULL.

#### Return values

Return value | Description
SUCCESS |
CTAERR_BAD_ARGUMENT | An argument is invalid or not usable.
CTAERR_BAD_SIZE | A size argument is invalid.
CTAERR_INVALID_HANDLE | The protocol is not running on the specified handle.
CTAERR_SVR_COMM | A server communication error occurred.

#### Details

nccGetLineStatus retrieves the status of the specified line. If the application provides a buffer that is large enough, this function retrieves a list of call handles existing on the line. Upon returning from the function, the NCC_LINE_STATUS size field contains the actual number of bytes written.

The NCC_LINE_STATUS structure contains the following fields:

Field | Description
--- | ---
size | Number of bytes written at the address pointed to by linestatus.
state | Current line state. Can be any of the following: NCC_LINESTATE_UNINITIALIZED NCC_LINESTATE_IDLE NCC_LINESTATE_BLOCKING NCC_LINESTATE_OUT_OF_SERVICE NCC_LINESTATE_ACTIVE
pendingcmd | The last line command issued that the board has not yet acknowledged. This field is set when a line control command is sent to the board, and cleared on the next event that corresponds to the acknowledgment of the pending command. Possible values are: (0) No command pending. NCC_PENDINGCMD_BLOCK_CALLS NCC_PENDINGCMD_UNBLOCK_CALLS NCC_PENDINGCMD_START_PROTOCOL NCC_PENDINGCMD_STOP_PROTOCOL
protocol | Arrays containing names of protocols running on this line.
port | MVIP address of call control resource (port), if needed. Specified with ctaOpenServices.
numcallhd | Number of unreleased call handles, starting from index 0.

#### See also

nccGetCallStatus, nccGetExtendedCallStatus