gPhoto2-Go

A more Go idiomatic interface to the gPhoto2 library.

Warning

I'm not a great Golang programmer, so this could be a complete disaster. But, if you want to use the gPhoto2 library and you'd prefer to avoid sticking cgo references all over your main Go program, this library might help.

I'm also not a great C programmer, having grown up with garbage collectors and other niceties. Therefore, this library will be riddled with memory leaks. I would appreciate any help in making it more memory efficient.

Installation

go get github.com/micahwedemeyer/gphoto2go

Requirements

You will also need libgphoto2 installed. If you are on Mac OS X, I recommend installing it with homebrew.

brew install libgphoto2

This should now compile by itself thanks to this // #cgo pkg-config: libgphoto2

Usage

The main goal with this library is to present a Go-friendly interface to the C methods of gPhoto2

Camera Initializing

camera := new(gphoto2go.Camera)
err := camera.Init()

This will create a new Camera struct and intitialize it, which prompts gphoto2 to auto-detect any connected USB cameras.

Taking a Photo

camera.TriggerCapture()

This will trigger the camera.

Downloading the Photos from the Camera

folders := camera.RListFolders("/")
for _, folder := range folders {
    files, _ := camera.ListFiles(folder)
    for _, fileName := range files {
        cameraFileReader := camera.FileReader(folder, fileName)
        fileWriter := os.Create("/tmp/" + fileName)
        io.Copy(fileWriter, cameraFileReader)

        // Important, since there is memory used in the transfer that needs to be freed up
        cameraFileReader.Close()
    }
}

Interpreting errors

Most of the functions will return an error code. If it is less than zero, that means an error has occurred. The library can translate the error integer into a human readable string.

err := camera.TriggerCapture()
if err < 0 {
    fmt.Printf(gphoto2go.CameraResultToString(err))
}