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https://github.com/Sija/gphoto2.cr

Crystal shard wrapping libgphoto2
https://github.com/Sija/gphoto2.cr

crystal gphoto2 libgphoto2 photography

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Crystal shard wrapping libgphoto2

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# gphoto2.cr [![CI](https://github.com/Sija/gphoto2.cr/actions/workflows/ci.yml/badge.svg)](https://github.com/Sija/gphoto2.cr/actions/workflows/ci.yml) [![Releases](https://img.shields.io/github/release/Sija/gphoto2.cr.svg)](https://github.com/Sija/gphoto2.cr/releases) [![License](https://img.shields.io/github/license/Sija/gphoto2.cr.svg)](https://github.com/Sija/gphoto2.cr/blob/master/LICENSE)



**gphoto2.cr** provides an FFI for common functions in [libgphoto2][gphoto].

It also includes a facade to interact with the library in a more idiomatic Crystal way.



## Installation



### Prerequisites



  * Crystal: `~> 1.11`

  * libgphoto2: `>= 2.5.2`

  * libgphoto2_port: `>= 0.10.1`



To install the latest libgphoto2, you can use `homebrew` or `apt-get`, depending on the platform:



#### Mac OS X



```

$ brew install libgphoto2

```



#### Debian/Ubuntu



```

$ apt-get install libgphoto2-6 libgphoto2-dev libgphoto2-port12

```



### Shard



Add this to your application's `shard.yml`:



```yaml

dependencies:

  gphoto2:

    github: Sija/gphoto2.cr

```



## Usage



```crystal

require "gphoto2"



# list available cameras

cameras = GPhoto2::Camera.all

# => [#, ...]



# list found cameras by model and port path

cameras.map { |c| [c.model, c.port] }

# => [["Nikon DSC D5100 (PTP mode)", "usb:250,006"], ...]



# use the first camera

camera = cameras.first



# ...or more conveniently

camera = GPhoto2::Camera.first



# search by model name

camera = GPhoto2::Camera.where(model: /nikon/i).first



# the above examples require the camera be manually closed when done

camera.close



# pass a block to automatically close the camera

GPhoto2::Camera.first do |camera|

  # ...

end



# ...or use `#autorelease` on any `Camera` instance

camera.autorelease do

  # ...

end



# check camera abilities (see `GPhoto2::CameraOperation`)

camera.can? :capture_image

# => true



# list camera configuration names

camera.config.keys

# => ["autofocusdrive", "manualfocusdrive", "controlmode", ...]



# read the current configuration value of an option

camera[:expprogram].value

# => "M"

camera[:whitebalance].value

# => "Automatic"



# compare the current configuration value

camera[:whitebalance] == "Automatic"

camera[:whitebalance] == :automatic

# => true



# list valid choices of a configuration option

camera[:whitebalance].as_radio.choices

# => ["Automatic", "Daylight", "Fluorescent", "Tungsten", ...]



# check if the configuration has changed

camera.dirty?

# => false



# change camera configuration

camera["iso"] = 800

camera["f-number"] = "f/4.5"

camera["shutterspeed2"] = "1/30"



# set radio widget value to first matching option

camera[:imageformat] = /Medium(.+?)JPEG/i



# check if the configuration has changed

camera.dirty?

# => true



# apply the new configuration to the device

camera.save



# alternatively, update the camera configuration in one go

camera.update({ iso: 200, shutterspeed2: "1/60", "f-number": "f/1.8" })



# ...do all of above while preserving camera original configuration

camera.preserving_config do

  # ...

end



# take a photo

file = camera.capture



# ...and save it to the current working directory

file.save



# ...or to a specific pathname

file.save("/tmp/out.jpg")



# traverse the camera filesystem

folder = camera/"store_00010001/DCIM/100D5100"



# generate a zip file

folder.to_zip_file # => #



# list files

files = folder.files

folder.files.map(&.name)

# => ["DSC_0001.JPG", "DSC_0002.JPG", ...]



# copy a file from the camera

file = files.first

file.save



# ...and then delete it from the camera

file.delete

```



More examples can be found in [`examples/`][examples]. Documentation can be generated using `crystal doc` task or [browsed online][docs].



[gphoto]: http://www.gphoto.org/

[examples]: https://github.com/Sija/gphoto2.cr/tree/master/examples

[docs]: https://sija.github.io/gphoto2.cr



## Development



Enable debug mode by passing `DEBUG=1` env variable:



```

DEBUG=1 crystal examples/list_cameras.cr

```



Run specs with:



```

crystal spec

```



## Contributing



1. Fork it ()

2. Create your feature branch (`git checkout -b my-new-feature`)

3. Commit your changes (`git commit -am 'Add some feature'`)

4. Push to the branch (`git push origin my-new-feature`)

5. Create a new Pull Request



## Thanks! 🎉



- The [gphoto2][gphoto] developers for building such an awesome tool

- [@zaeleus](https://github.com/zaeleus) for the [ffi-gphoto2](https://github.com/zaeleus/ffi-gphoto2) gem, on which this library is heavily inspired



## Contributors



- [@Sija](https://github.com/Sija) Sijawusz Pur Rahnama - creator, maintainer