## GypsyControl GypsyControl — Control object for gypsy-daemon |

## Synopsis

                        GypsyControl;
    #define             GYPSY_CONTROL_DBUS_SERVICE
    #define             GYPSY_CONTROL_DBUS_PATH
    #define             GYPSY_CONTROL_DBUS_INTERFACE
    GypsyControl *      gypsy_control_get_default           (void);
    char *              gypsy_control_create                (GypsyControl *control,
                                                             const char *device_name,
                                                             GError **error);

## Object Hierarchy

      GObject
       +----GypsyControl

## Description

GypsyControl is the object that controls the gypsy-daemon process. It is a singleton object, meaning that there will only be one instance of it per application. Once the object has been created (or referenced if it had already been created for the application) with `gypsy_control_get_default()`, it can be used to tell gypsy-daemon what GPS device to connect to with `gypsy_control_create()`. This call returns the D-Bus object path to the GPS object in gypsy-daemon. This object path is then used to create other objects, such as GypsyPosition, or GypsyCourse.

As gypsy-daemon is able to connect to multiple GPS devices, the one GypsyControl can be used to create them, returning a different path for each GPS device. Gypsy-daemon can connect to both serial port devices which have an entry in `/dev` and Bluetooth devices natively without the need to use rfcomm to set up a `/dev` entry. To do this you pass either the device path or the Bluetooth address of the device to `gypsy_control_create()`.

Once the program has finished with the GPS, the GypsyControl object should by unreferenced with `g_object_unref()`.

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    . . .

    <a class="link" href="gypsy-gypsy-control.html#GypsyControl">GypsyControl</a> *control;
    char *path_bt, *path_dev;
    GError *error = NULL;

    . . .

    control = gypsy_control_get_default ();
    / * Use a Bluetooth device * /
    path_bt = gypsy_control_create (control, "aa:bb:cc:dd:ee", &error);
    if (path_bt == NULL) {
      g_warning ("There was an error creating aa:bb:cc:dd:ee - %s", error->message);
      g_error_free (error);
      error = NULL;
    }

    / * Use a serial port device * /
    path_dev = gypsy_control_create (control, "/dev/gps", &error);
    if (path_dev == NULL) {
      g_warning ("There was an error creating /dev/gps - %s", error->message);
      g_error_free (error);
      error = NULL;
    }

    . . .

    / * Use the paths here to create listener objects * /

    . . .

    g_free (path_bt);
    g_free (path_dev);

    . . .

    / * The program has finished with Gypsy now, unref the object. * /
    g_object_unref (G_OBJECT (control));

## Details

### GypsyControl

    typedef struct _GypsyControl GypsyControl;

There are no public fields in GypsyControl.

### GYPSY_CONTROL_DBUS_SERVICE

    #define GYPSY_CONTROL_DBUS_SERVICE "org.freedesktop.Gypsy"

A define containing the service name of the control service

### GYPSY_CONTROL_DBUS_PATH

    #define GYPSY_CONTROL_DBUS_PATH "/org/freedesktop/Gypsy"

A define containing the object path of the Gypsy object

### GYPSY_CONTROL_DBUS_INTERFACE

    #define GYPSY_CONTROL_DBUS_INTERFACE "org.freedesktop.Gypsy.Server"

A define containing the name of the Control interface

### gypsy_control_get_default ()

    GypsyControl *      gypsy_control_get_default           (void);

Retrieves the default GypsyControl object.

Returns : | A singleton GypsyControl. Once the program has finished using the GypsyControl, it should be unreferenced with `g_object_unref()`.

### gypsy_control_create ()

    char *              gypsy_control_create                (GypsyControl *control,
                                                             const char *device_name,
                                                             GError **error);

Creates a object on the server that refers to the GPS device at `device_name`. When this object is finalized, the remote object on the server will be shutdown after which any calls to the object at the returned path are not guaranteed to work.

`control` : | The GypsyControl device
`device_name` : | The path to the device file, or Bluetooth address
`error` : | A GError to return errors in, or `NULL`
Returns : | The path to the created object.