printf 02x

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0x%02x 16-Input output of the character type

Label:Problem: A character type in 16 output, the output format is 0xAB, 0x is required after 2 bits, not enough 2 bit 0, such as "0x0b".Common error practices are: #include <stdio.h> int Main () { char a = 0x41; //A = ' a '

The difference between%02x and%2x

Output minimum width A decimal integer to represent the minimum number of digits of the output. If the actual number is more than the defined width, the actual digit is output, or a space or 0 if the actual number is less than the defined width (when

WinPcap Network Programming 10 WinPcap combat, two hosts through the intermediate host communication

Tags: Network programming WinPcapNote: This blog is also not aimed at the party, the source code and so on I will not be completely public, this article written out for everyone's network programming or curriculum design to provide certain

Linux Network Programming--Original Socket instance: Analysis of MAC head message

Label:Through the Linux network programming-the original socket programming, we know that we can get the link layer packets through the raw sockets and recvfrom (), what is the link layer Packet we receive ?Link Layer envelope formatMAC head (wired

iOS tools class obtains device unique identification (compatible with ios5,6,7)

Label:Uidevice+identifieraddition.h:#import <Foundation/Foundation.h> @interface Uidevice (identifieraddition)-(NSString *) uniquedeviceidentifier ; @endUidevice+identifieraddition.m#import "Uidevice+identifieraddition.h" #import "nsstring+md5.

iOS tools class obtains device unique identification (compatible with ios5,6,7)

Tags: blog io os using AR for log onUidevice+identifieraddition.h:#import <Foundation/Foundation.h> @interface Uidevice (identifieraddition)-(NSString *) uniquedeviceidentifier ; @endUidevice+identifieraddition.m#import

LINUX get IP address and MAC address __linux

#include <stdio.h>#include <sys/types.h>#include <sys/param.h> #include <sys/ioctl.h>#include <sys/socket.h>#include <net/if.h>#include <netinet/in.h>#include <net/if_arp.h> #ifdef SOLARIS#include <s

How IOS gets the phone's MAC address _ios

First of all, the following two methods can get the phone's MAC address, but there is a limit, in the iOS7 below can be obtained. IOS7 after the Apple for SYSCTL and IOCTL technical processing, MAC address returned are 02:00:00:00:00:00. It is writt

Three ways to get the MAC address of the network card in the system by "reprint"

Label:from: concept of network card address is a bit confusing. Because there are actually two addresses, MAC address and physical address, generally say the network card address I mean

Crawl and restore of WINPCAP data packet

WINPCAP Technical Manual, in addition to the installation file Doc file under a help, here in a: Once we grab the packet with the PCAP_NEXT_EX function, we're going to start extracting the key informati

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