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divided into two types based on different receiving objects:1. Broadcast package (broadcast ). The MAC address of the broadcast packet is a FF-FF-FF-FF-FF-FF, which is forwarded to all hosts in the LAN after the switch device receives the broadcast packet.2. Non-broadcast package (non-broadcast ). Only the specified host can receive a non-broadcast packet. ARP packets can be divided into two types based on different functions:1. arp request packets ). The ARP request packet is used to obtain th

, CURLOPT_CUSTOMREQUEST, "POST"); curl_setopt ($ ch, CURLOPT_POSTFIELDS, $ sendJsonData); curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, true ); curl_setopt ($ ch, CURLOPT_HTTPHEADER, array ('content-Type: application/json', 'Content-Length :'. strlen ($ sendJsonData); $ ret = curl_exec ($ ch); if ($ ret = '00') {code executed successfully ;} elseif ($ ret = '11') {logon failed} This was originally written in this way. login failed {"Aa": "00", "bb": "

@ Property defines attributes and declares the getter and setter methods. (Note: The property is not a variable) @ Synthesize is used to implement attributes, such as the getter and setter methods. If you override setter, Getter, and method when declaring an attribute, You need to define the unrecognized variable in @ synthesize and apply the attribute access method to the variable. For example: . H file @property (nonatomic,assign)NSInteger age;@property (nonatomic,retain)NSString * name;@prope

In Linux, back up partition tables: Use the DD command 1. Back up the MBR Master Boot Record without backing up the master Partition Table: # Dd If =/dev/SDA of = MBR. Backup BS = 446 COUNT = 1 2. View in hexadecimal format:# HD-v mbr. Backup00000000 EB 63 90 D0 BC 00 7C 8e C0 8e D8 be 00 7C BF 00 |. C ...... |00000010 06 B9 00 02 FC F3 A4 50 68 1C 06 cb fb B9 04 00 | ...... pH ...... |00000020 BD be 07 80 7E 00 00 7C 0b 0f 85 0e 01 83 C5 10 | ....~.. | ...... |00000030 E2 F1 CD 18 88 56 00 55

Resolution" is the process by which a host converts a target IP address to a target MAC address before sending a frame. The basic function of ARP protocol is to inquire the MAC address of target device through the IP address of target device, so as to ensure the smooth communication. Each computer installed with the TCP/IP protocol has an ARP cache table, and the IP address in the table and the MAC address is one by one corresponding, as shown in the tables below. Host IP Address MAC address

use the TcpClient class to develop an SMTP client to send mail.3.1 Sending SMTP commandsThe SMTP server generally recognizes the UTF8 code, and all Send commands use UTF8 encoding, and each command ends with a carriage return line break. The following code implements the command's send function.private void Writetonetstream (ref networkstream netstream.string Command){String stringtosend = Command + "\ r \ n";byte[] Arraytosend = System.Text.Encoding.UTF8.GetBytes(Stringtosend.tochararray ());N

{ public static short getunsignedbyte (Bytebuffer bb) {return (short) (Bb.get () 0xff)); } public static void Putunsignedbyte (Bytebuffer bb, intValue) {Bb.put ((byte) (value 0xff)); } public static short getunsignedbyte (Bytebuffer BB, int. position) {return (short) (Bb.get (position) (short) 0xff)); } public static void Putunsignedbyte (Bytebuffer

I thought that PHP and and are the same, just the wording for readability and aesthetics, in fact I was wrong. There's a hole deep inside!Look at the following code:$bA = true;$bB = false;$b 1 = $bA and $bB;$b 2 = $bA $bB;Var_dump ($b 1); $b 1 = TrueVar_dump ($b 2); $b 2 = False$bA = false;$bB = true;$b 3 = $bA or $

host converts a target IP address to a target MAC address before sending a frame. The basic function of ARP protocol is to inquire the MAC address of target device through the IP address of target device, so as to ensure the smooth communication. Each computer installed with the TCP/IP protocol has an ARP cache table, and the IP address in the table and the MAC address is one by one corresponding, as shown in the tables below. Host IP Address MAC address A 192.168.16.1 Aa-aa-aa-aa-aa-aa B 1

Tags: repeatableThe transaction isolation level is repeatable read in caseTransaction 2 does not execute a commit and cannot read the newly added record for transaction 1.Transaction 2 executes a commit and can read the newly added record to transaction 1.Session1 Execution Transaction 1: Insert and commit onlyMysql> SELECT @ @tx_isolation;+-----------------+| @ @tx_isolation |+-----------------+| Repeatable-read |+-----------------+1 row in Set (0.00 sec)Mysql>mysql> start transaction;Query OK,

string such as: D:/fqf.txt*/Public void movefile (string oldpath, string newpath){Copyfile (oldpath, newpath );Delfile (oldpath );}/*** Move a file to a specified directory* @ Param oldpath string such as: C:/fqf.txt* @ Param newpath string such as: D:/fqf.txt*/Public void movefolder (string oldpath, string newpath){Copyfolder (oldpath, newpath );Delfolder (oldpath );}Public static void main (string ARGs []){String AA, BB;Boolean exitnow = false;Syst

Often a friend asks a question like this, The data in the table is as follows ID AA BB 1 123 456 1 4535 54 1 60 6564 1 60 656 2 50 664 2 60 6 3 89 89 4 40 4242 The hope is that the result will be ID AA BB 1 123 456 2 50 664 3 89 89 4 40 4242 Of course, the environment is SQL Server The answers and analysis are as follows: 1, many friends want to use distinct to solve the problem, but it is impossible, Disct

If php5.4 is used for reference, an error is returned. if php5.4 is used for reference, an error is returned. If php5.4 is used for reference, an error is reported. if php5.4 is used for reference, an error is reported. if php5.4 is used for reference, an error is returned. For your reference, refer to the following for details: Error analysis when using php5.4 in the php5.3 series, and error when using php5.4. This example analyzes the error message returned when php5.4 is referenced. We will

Is the object ajaxpost in js directly converted to an array in php? This post was last edited by zhoumengkang at 10:03:14 Jquery was introduced in advance. var str ="{'a':'b','aa':'bb'}";var str2 = eval('('+str+')');var type = typeof(str2);console.log(str);console.log(type);//objectconsole.log(str2);$.post('./bb.php',{'data':str2}); Bb. php code $data = $_POST['data'];var_dump($data); The returned res

I want to put keywords in the software search function, such as "apple", I want to get Baidu search Apple link: http://www.baidu.com/baidu? WD = % C6 % BB % B9 % FB Q = 3 How can this link be generated? If not, what search engine can easily achieve such a search link: http://www.baidu.com/baidu? WD = "apple "??? Search "apple ":Baidu: http://www.baidu.com/baidu? WD = % C6 % BB % B9 % FB Q = 3QQ. Soso: ht

This article mainly introduces the problem of errors reported by reference in php5.4, and analyzes the problem and solution of errors reported by reference in php5.4 based on the instance form, which has some reference value, if you need it, you can refer to the example in this article to analyze the error message returned when you reference php5.4. We will share this with you for your reference. The details are as follows: There is no problem in transferring references from php5.3 series and e

php5.4 quoted times wrong problem analysis, php5.4 quoted times wrong In this paper, the author analyzes the php5.4 of quoted times. Share to everyone for your reference, as follows: php5.3 Series version and previous version, reference no problem, after upgrading to php5.4, the place of reference, full error Fatal error:call-time pass-by-reference have been removed in F:\work\wamp\www\test\test.php on line 6. take a look at the following example. Example 1, recursive reference, PHP 5.3 and ver

[Description] Given a tree with N nodes, calculate the maximum distance between each node and other nodes.[Input format]The first line of the input is a natural number N (N Line I contains two natural numbers, indicating the node number connected to the node numbered I and the length of the network cable ..The total length cannot exceed 10 ^ 9. Two numbers in each line are separated by spaces.[Output format]The output contains N rows. line I indicates the Si distance between the node that is far

1. String Conversions to arraysSplit ();Console.log ("AABBCC". Split (")"); Print: ["A", "a", "B", "B", "C", "C"]2. Array conversion to stringJoin ();Console.log ([' AA ', ' BB ', ' VV '].join (")"); Print: AABBVV3. Finding elements in an arrayIndexOf (); Used to find whether an element is in an array, returns an index of an array if it exists, or returns-1;["AA", ' BB '].indexof ('

1. Command functionRM: Delete a directory or file2. Command formatRM [Options] Directory or file3. Command parameters-I: Interactive delete-R: Recursive Delete, delete directory-F: Force delete-V: Show more information4. Command instancesExample 1: Interactive Delete[Email protected] ~]# Rm-ir ABCRm:remove directory ' abc '? Yes[[email protected] ~]# lsAnaconda-ks.cfg Desktop file1 file2 gg install.log install.log.syslogExample 2: Delete directory, recursive delete[Email protected] ~]# MKDIR-PV