chromecast operation

Operation of basic files The basic operation of the file is: file Judgment, catalogue judgment, file size, reading and writing judgment, existence judgment and file time, etc. Results: Ii. operation of the directory Directory operations are: Traversal directory, delete, copy, size statistics, etc. 1, traverse the directory * * Traverse direct

If you are interested in this article, you may have encountered the following similar exception hints in programming: 1, the thread operation is invalid: it is accessed from a thread that is not creating the control "X". (x is the name of the control) 2, "the operation performed on the control is being invoked from the wrong thread." Use Control.Invoke or Control.BeginInvoke to marshal to the correct thre

Tag: is the middle Number Union Div range operation get stringManipulation of strings#redis中的string is stored in memory by a key corresponding to a valus.1 ImportRedis2 3Pool = Redis. ConnectionPool (host="192.168.1.5", port=6379, db=0)4R = Redis. Redis (connection_pool=pool)5R.set ('name','WXP')6 #print (R.keys ())7 Print(R.get ("name"))8R.mset (name1 ='W', name2 ='x')9 Print(R.mget ('name1','name2'))TenR.mset ({"a":"1","b":"2"}) One Print(R.mget ('a

Tags: parentheses random call type wildcard character important list Erro miningFirst, overview:The previous blogs focused on commands related to Redis data types, such as String, List, Set, hashes, and Sorted-set. These commands all have one thing in common, that is, all operations are for the value associated with the key. This blog will focus on the Redis commands associated with key. Learning these commands is a very important foundation for learning Redis and is a powerful tool to fully tap

This article mainly describes how to export LOB data using the table operation technique of DB2 database. If there is a table of employee information (USER_INFO. There are three fields in this table: employee ID, employee name, and employee ID card copy. Because the size of the employee ID card copy is relatively large, the LOB data type is used in the database. For example, there is a table (USER_INFO) for employee information. This table contains t

", "D", "E"]console.log (Str.split (' | ', 3)); returns ["A", "B", "C"]console.log (Str.split (')); returns ["a", "|", "b", "|", "C", "|", "D", "|", "e"]You can also use regular to splitvar str = ' a1b2c3d4e '; Console.log (Str.split (/\d/)); returns ["A", "B", "C", "D", "E"](3) toLowerCase () and toUpperCase ()Stringobject.tolowercase () stringobject.touppercase ()The toLowerCase () method converts uppercase letters in a string to lowercase, and the toUpperCase () method converts lowercase lett

. The Second optional parameter is a PHP constant that takes a value directly from the arrayVar_dump ($url _info);$result = pathinfo ($url _info[' path ');//PathInfo () can info out some information such as file name, directory name, suffix name, etc.Var_dump ($result);Array (5) {["Scheme"]=>String (4) "http"["Host"]=>String "www.google.com"["Path"]=>String (+) "/abc/xyz/fck.php"["Query"]=>String (4) "Id=1"["Fragment"]=>String (5) "Sharp"}Array (4) {["DirName"]=>String (8) "/ABC/XYZ"["BaseName"]

The dom4j operation xml demo and the dom4j operation xmldemo Package com.cn. shop. util; Import java. io. File;Import java. io. FileOutputStream;Import java. io. OutputStreamWriter;Import java. util. Iterator;Import java. util. List; Import org. dom4j. Attribute;Import org. dom4j. Document;Import org. dom4j. extends entexception;Import org. dom4j. DocumentHelper;Import org. dom4j. Element;Import org. dom4j.

Python3 tkinter simple 2048 game, button operation or keyboard operation, python3tkinter This 2048 game is relatively simple. You should not laugh First, we will introduce the 2048 game, which is a 4x4 two-dimensional array. You can change the value of the array through the upper, lower, and left operations. For example, if you move up, each column is added with adjacent and equal numbers. After the additio

Binary operation (1)-Bytes, binary operation-bytes 1. The Bytes unit is processed as a string. For example: Some presentations claim that the above procedures will produce the following results:B '\ x00 \ x00 \ x00 \ x00' This result is not available on python v2.7.10. In fact, if type (arr) is returned, str is returned. Another example: Note that len (b1) is 12, that is, there is a space after t

Php implementation code for digital operation verification code, php digital operation Verification Code The example in this article describes how to implement a digital verification code in php. The specific implementation method is as follows: Effect: The above describes how to use php to implement the verification code for Digital computation. I hope it will be helpful for your learning.

JQuery node element attribute operation method, jquery node Operation Method This document describes how to operate element attributes of a JQuery node. Share it with you for your reference. The specific analysis is as follows: In JQuery, the attr () method is used to obtain and set element attributes. The removeAttr () method is used to delete element attributes. Get and set attributes To obtain the attrib

connection address of the current db. getMongo (); Help command prompt help db. help (); db. yourColl. help (); db. youColl. find (). help (); rs. help (); clone the database db from the specified host. cloneDatabase ("127.0.0.1 ");?? Clone the database data on the specified machine to the current database and copy the data from the specified machine to a database. copyDatabase ("mydb", "temp", "127.0.0.1 ″);? Copy the mydb data of the local machine to the temp database to repair the current da

MySql DATA partition operation-new partition operation, mysql Data Partition added If you want to partition a created table and use alter to add a partition, mysql will prompt an error:Copy codeThe Code is as follows:ERROR 1505 The correct method is to create a new table with partitions with the same structure, and then use insert into Partition Table select * from original table; Create a partition table F

Basic MySQL Data Table operation 2: Table Structure View, modification, and table operation 1. view the data table structure 1) view the basic table structure statement DESCRIBE Syntax:DESCRIBETable Name; Example: mysql> DESCRIBE product;+--------------+--------------+------+-----+---------+----------------+| Field | Type | Null | Key | Default | Extra |+--------------+--------------

The 10 Best PHP image operation libraries ThomasBoutell and many developers have created a well-known graphics software library: GD graphics library that can be used to dynamically process graphics images. GD provides support for many programming languages, such as C, Perl, Python, PHP, and OCaml. Thomas Boutell and many developers have created a well-known graphics software library: GD graphics library, which can be used to dynamically process graphi

Positioning of a pair of elementsIn JS, you can use the ID, class, name, tag name for element positioningID, class is used in the clientName is used on the service sideLocate with ID --only one can be found by IDvar a = document.getElementById ( "id name" ) --Change the found to the variable aUse class to locatevar a = documen.getelementsbyclassname ( "class name")--Find the array according to ClassName.Positioning with Markers var a = document.getElementsByTagName ("tag name")--based on the tag

corresponding Rootfs path in the/mnt/sysroot directory, for example, if the original path of the copied file is/usr/bin/useradd, it is copied to the/mnt/sysroot/usr/bin/directory;(3) Copy the library files that this command relies on to the corresponding Rootfs path in the/mnt/sysroot directory, and the rules related to the above command;For:#!/bin/bashmkdir-p/mnt/sysrootdestpath= "/mnt/sysroot" read-p "Enter a command:" Commandwhich--skip-alias ${command} Amp;>/dev/null[$-ne 0] echo "command

, shutdown, Poweroff, reboot, Hwclock, the use of the date command , and is elaborated in conjunction with the corresponding example.Ifconfig: Mainly used to display and configure the network interface;[[Emailprotected]_13_60_centosroot]$ifconfigeth0:flags=4163-a displays all currently available interfaces: [[Emailprotected]_13_60_centosroot]$ifconfig-aeth0:flags=4163-S displays a short list: [[emailprotected]_13_60_centosroot]$ifconfig-s IfaceMTURX-OKRX-ERRRX-DRP rx-ovrtx-oktx-errtx-drptx-ovr

The document is the JSON that the array turns intoOriginal array:Array0 =>3,1 =>3,2 =>4,3 =>5,4 =>5,5 =>6)Insert the Times error after removing the repeating elements in the array with Array_unique.Reason:After the array_unique is removed, the subscript of the original array is retained. Array isArray (0 =>3,2 =>4,3 =>5,5 =>6)In the Json_encode array, the subscript discontinuous array is parsed into a JSON string such as {"0": "3", "2": "4", "3": "5", "5": 6}. Expect {["3", "4", "5", "6"]}. The