snapshot.jpg of Camera IP(D-LINK DSC 4201) 在 Dashing 中不刷新

Question

感谢点击此 post，我的 RPI 3 上有一个由 Dashing 驱动的仪表板，我在其中为我的相机 IP 添加了一个小部件 (D-link DSC 4201).

有 ruby 个工作捕捉到我相机的 snapshot.jpeg :

require 'net/http'

@cameraDelay = 1 # Needed for image sync. 
@fetchNewImageEvery = '3s'

@camera1Host = "192.168.0.20"  ## CHANGE
@camera1Port = "80"  ## CHANGE
@camera1Username = 'admin' ## CHANGE
@camera1Password ='*****'
@camera1URL = "/dms?nowprofileid=1&"
@newFile1 = "assets/images/cameras/snapshot1_new.jpg"
@oldFile1 = "assets/images/cameras/snapshot1_old.jpg"


def fetch_image(host,old_file,new_file, cam_user, cam_pass, cam_url)
    `rm #{old_file}` 
    `mv #{new_file} #{old_file}`    
    Net::HTTP.start(host) do |http|
        req = Net::HTTP::Get.new(cam_url)
        if cam_user != "None" ## if username for any particular camera is set to 'None' then assume auth not required.
            req.basic_auth cam_user, cam_pass
        end
        response = http.request(req)
        open(new_file, "wb") do |file|
            file.write(response.body)
        end

        end
    new_file
end

def make_web_friendly(file)
  "/" + File.basename(File.dirname(file)) + "/" + File.basename(file)
end

SCHEDULER.every @fetchNewImageEvery do

        new_file1 = fetch_image(@camera1Host,@oldFile1,@newFile1,@camera1Username,@camera1Password,@camera1URL)

    if not File.exists?(@newFile1)
        warn "Failed to Get Camera Image"
    end
    send_event('camera1', image: make_web_friendly(@oldFile1))
    sleep(@cameraDelay)
    send_event('camera1', image: make_web_friendly(new_file1))

end

实际上我的工作只显示前两张图片（在@oldFile1、@newFile1 中），在他进入循环后他只显示前两张图片捕捉到我的仪表板。

所以，我查看了 /assets，我看到我的两个 snapshots.jpg 像我的工作一样实时刷新，但是仪表板没有显示它。

那么为什么仪表板不采用刷新图像..？

Answer 1

今天刚运行讨论这个问题。最终重写了一些东西。很确定这是浏览器缓存问题，因为文件名相同。只是附加日期时间并推送它似乎有效。

require 'net/http'
require 'open-uri'

@url = 'http://172.1.1.16/image.jpg'

SCHEDULER.every '4s', :first_in => 0 do |job|

    `find '/dashing/f12dash/assets/images/cameras/' -type f -mmin +1 -print0 | xargs -0 rm -f`

    @currentTime = Time.now.strftime("%Y-%m-%d_%H-%M-%S")
    @newFile1 = "assets/images/cameras/snapshot-" + @currentTime + "_new.jpeg"

    open(@url, :http_basic_authentication => ['root', 'CamPW']) do |f|
      open(@newFile1,'wb') do |file|
        file.puts f.read
      end
    end

    send_event('camera1', image: ("/" + File.basename(File.dirname(@newFile1)) + "/" + File.basename(@newFile1)))

end

snapshot.jpg of Camera IP(D-LINK DSC 4201) 在 Dashing 中不刷新

snapshot.jpg of Camera IP(D-LINK DSC 4201) not refresh in Dashing

ruby

ip-camera

dashing

raspberry-pi3