空指针导致程序出错

handler/tool.go

@@ -169,7 +169,13 @@ func subscribeAndHandleMessagesV3(ws *websocket.Conn, device_id int) {
 			if img.Empty() {
 				fmt.Println("device:%d img is empty!", device_id)
 			} else {
-				buf, _ := gocv.IMEncode(".jpg", img)
+				//gocv.Matrix转为jpeg
+				buf, err := gocv.IMEncode(".jpg", img)
+				if err != nil {
+					fmt.Println("img encode err:", err)
+					worker.SetRedisSetRemove(online_conn_key, con_id)
+					goto end
+				}
 				buf1 := buf.GetBytes()
 
 				err2 := ws.WriteMessage(websocket.BinaryMessage, buf1)
@@ -193,6 +199,10 @@ func subscribeAndHandleMessagesV3(ws *websocket.Conn, device_id int) {
 		}
 		time.Sleep(100 * time.Millisecond)
 		t_count++
+		err := img.Close()
+		if err != nil {
+			fmt.Println("close img err:", err)
+		}
 	}
 
 end: