技术经验 • dingxiao • 阅读数:2240 • 2018年7月16日 15:36

网上收集的关于mqtt发送和接收图片的代码片段

1.github项目iot_study

iot_study  

  //capture, filter, then publish
  def capture():
      cap = cv2.VideoCapture(VIDEO_ID)
      ret,img = cap.read()
      img = cv2.convertScaleAbs(img)
      try:
          for filter_ in FILTERS:
              for func in filter_.keys():
                  args = filter_[func]
                  img = globals()[func](img,args)
          encode_param = [int(cv2.IMWRITE_JPEG_QUALITY), 100]
          result,encimg = cv2.imencode('.jpg', img, encode_param)
          client.publish('image', base64.b64encode(encimg), qos=0, retain=False)
      except Exception:
      traceback.print_exc()

2.stackoverflow问题

JavaScript - Mqtt Sending and Reciving Image

  function onMessageArrived(r_message){
   console.log(r_message);
    
   document.getElementById("ItemPreview").src = "data:image/png;base64," + convert(r_message.payloadBytes);
  }
  
  function convert(buffer) {
   var binary = '';
   var bytes = new Uint8Array(buffer);
   var len = bytes.byteLength;
   for (var i = 0; i < len; i++) {
    binary += String.fromCharCode(bytes[i]);
   }
   return window.btoa(binary);
  }

3.stackoverflow问题

How to convert image into base64 string using javascript

4.stackoverflow问题

Receiving image through websocket

5.关于MQTT库paho在JavaScript上的使用例程

Eclipse Paho JavaScript Client

6.github上phao.mqtt.python收发图片例程堪错

Error when try send a file (image)

7.stackoverflow问题

How can I publish and subscribe a image file using Mosquitto in python?

8.github项目mqtt_camera

mqtt_camera

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