Camera.jpg（D-LINK DSC 4201）在Dashing中沒有刷新

Question

感謝您點擊這篇文章，我有一個儀表板供電Dashing在我的RPI 3，在那裏我添加一個小部件，我的相機IP（D - 鏈接DSC 4201）。

Camera-widget Link

還有誰趕上我的相機snapshot.jpeg紅寶石工作：

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 

其實我的工作只顯示前兩個圖像（@ oldFile1，@ newFile1）和後他在一個循環中股票，他只顯示前兩個圖像趕上我的儀表板。

因此，我查看了/ assets，並且看到我的兩個snapshots.jpg實時刷新，就像我的工作一樣，但是這個dashing dashboard不顯示它。

那麼，爲什麼儀表板不採取刷新圖像..？

Answer 1

今天剛剛遇到這個問題。結束了一些重寫。很確定這是一個瀏覽器緩存問題，因爲文件名是相同的。只需附加日期時間並推動它似乎工作。

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