gphoto2 1.0.0

High-level wrapper for libgphoto2
Documentation 
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
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

//! Library context
use crate::{
  abilities::AbilitiesList, camera::Camera, helper::uninit, list::CameraList, port::PortInfoList,
  try_gp_internal, Error, Result,
};
use std::ffi;

/// Context used internally by gphoto
///
/// ## Example
///
/// ```no_run
/// use gphoto2::{Context, Result};
///
/// # fn main() -> Result<()> {
/// let context = Context::new()?;
///
/// let camera_list = context.list_cameras()?;
///
/// // Use first camera in the camera list
///
/// let (model, port) = &camera_list.to_vec()?[0];
/// context.get_camera(&model.to_string(), &port.to_string());
///
/// # Ok(())
/// # }
///
/// ```
pub struct Context {
  pub(crate) inner: *mut libgphoto2_sys::GPContext,
}

impl Drop for Context {
  fn drop(&mut self) {
    unsafe { libgphoto2_sys::gp_context_unref(self.inner) }
  }
}

impl Context {
  /// Create a new context
  pub fn new() -> Result<Self> {
    let context_ptr = unsafe { libgphoto2_sys::gp_context_new() };

    if context_ptr.is_null() {
      Err(Error::new(libgphoto2_sys::GP_ERROR_NO_MEMORY))
    } else {
      Ok(Self { inner: context_ptr })
    }
  }

  /// Lists all available cameras and their ports
  ///
  /// Returns a list of (camera_name, port_path)
  /// which can be used in [`Context::get_camera`].
  pub fn list_cameras(&self) -> Result<CameraList> {
    let camera_list = CameraList::new()?;

    try_gp_internal!(libgphoto2_sys::gp_camera_autodetect(camera_list.inner, self.inner))?;

    Ok(camera_list)
  }

  /// Auto chooses a camera
  ///
  /// ```no_run
  /// use gphoto2::{Context, Result};
  ///
  /// # fn main() -> Result<()> {
  /// let context = Context::new()?;
  /// if let Ok(camera) = context.autodetect_camera() {
  ///   println!("Successfully autodetected camera '{}'", camera.abilities()?.model());
  /// } else {
  ///   println!("Could not autodetect camera");
  /// }
  /// # Ok(())
  /// # }
  /// ```
  pub fn autodetect_camera(&self) -> Result<Camera> {
    let mut camera_ptr = unsafe { uninit() };

    try_gp_internal!(libgphoto2_sys::gp_camera_new(&mut camera_ptr))?;
    try_gp_internal!(libgphoto2_sys::gp_camera_init(camera_ptr, self.inner))?;

    Ok(Camera::new(camera_ptr, self.inner))
  }

  /// Initialize a camera knowing its model name and port path
  ///
  /// ```no_run
  /// use gphoto2::{Context, Result};
  ///
  /// # fn main() -> Result<()> {
  /// let context = Context::new()?;
  /// let camera_list = context.list_cameras()?;
  /// let camera_list = camera_list.to_vec()?;
  ///
  /// if camera_list.len() < 1 {
  ///   Err("No cameras found")?
  /// }
  ///
  /// let camera = context.get_camera(&camera_list[0].0[..], &camera_list[0].1[..])?;
  /// # Ok(())
  /// # }
  pub fn get_camera(&self, model: &str, port_path: &str) -> Result<Camera> {
    let mut model_abilities = unsafe { uninit() };
    let mut camera = unsafe { uninit() };
    let abilities_list = AbilitiesList::new(self)?;
    let port_info_list = PortInfoList::new()?;

    try_gp_internal!(libgphoto2_sys::gp_camera_new(&mut camera))?;

    let model_index = try_gp_internal!(libgphoto2_sys::gp_abilities_list_lookup_model(
      abilities_list.inner,
      ffi::CString::new(model)?.as_ptr(),
    ))?;

    try_gp_internal!(libgphoto2_sys::gp_abilities_list_get_abilities(
      abilities_list.inner,
      model_index,
      &mut model_abilities
    ))?;
    try_gp_internal!(libgphoto2_sys::gp_camera_set_abilities(camera, model_abilities))?;

    let p = try_gp_internal!(libgphoto2_sys::gp_port_info_list_lookup_path(
      port_info_list.inner,
      ffi::CString::new(port_path)?.as_ptr()
    ))?;
    let port_info = port_info_list.get_port_info(p)?;
    try_gp_internal!(libgphoto2_sys::gp_camera_set_port_info(camera, port_info.inner))?;

    Ok(Camera::new(camera, self.inner))
  }
}