First, overview:
A string type is the most basic type of data storage in Redis, and it is binary safe in Redis, which means that the type can accept data in any format, such as JPEG image data or JSON object description information. The value of
I didn't plan to write this article, but everyone knows the importance of the file. In device I/O, a device is called a file device. This is an abstract concept. You just need to understand it as a file.
File device, which can be opened through the
Here is the address format of the IPV4, the total length 32 bits = 4 Segments * 8 bits, each paragraph is used. Split, each paragraph is a decimal value between 0-255.The 0-255 is represented by a regular expression, which can be divided into
First, overview:The string type is the most basic type of data storage in Redis, which is binary safe in Redis, which means that the type can accept data in any format, such as JPEG image data or JSON object description information. The value of the
The binary uses only the numbers 0 and 1, where each number corresponds to one bit (bits). In general, we will use each 4-bit or 8-bit as a group, which is called half-byte (nibble) and Byte, respectively.We are interested in the binary value
In the process of learning Stm32 encountered the problem of macro definition, so, write to everyone to learn togetherSource of the problem:where \ is the escape character in the language, used to connect the context, because the macro definition can
Brief introductionIn the code of a group of numbers, if any two adjacent code is different from only one binary number, it is called the gray Code , and also because the maximum number and the minimum number are only one digit difference , that is,
Signed integer:Short at least 16 digits;int at least as long as short-;Long at least 32 bits, and at least int--like length;A long long is at least 64 bits long and at least long--like;unsigned integer:unsigned shortunsigned intunsigned (equals
There is such a requirement:
Identify orders from the database that contain "goods 1" and "Commodities 2";
Identify orders from the database that contain "goods 1" or "Commodities 2";
Identify orders from the database that contain
The DT block format
This chapter defines the format of the FDT (flattened device tree) passed to the kernel. The properties it contains and the attributes required by the kernel are described in subsequent chapters.Note: The DT block should be
A single line definition of a macro#define A (x) t_# #x#define B (x) #@x#define C (x) #xWe assume: x=1, then there are:A (1)------〉t_1B (1)------' 1 'C (1)------"1"
. How to define macros, cancel macrosDefining macros#define [macroname]
TCP/IP packet structure
In general, we only need to call encapsulated functions or components to complete most of network programming. However, in some special cases, we need to have a deep understanding of the structure of network data packets,
The debug system can be easily and intuitively observed using Bochs. The following is a selection of an XP boot actual fragment, as follows:
Sregcs:s=0x001b, Dl=0x0000ffff, Dh=0x00cffa00, valid=1ds:s=0x0023, Dl=0x0000ffff,
Java Multithreading Series--"Juc thread pool" 04 thread pool principle (iii)This chapter describes the life cycle of the thread pool. In the Java Multithreading Series-Basic concepts of 01, we've introduced threads in 5 states: New state, ready
First, overview:
A string type is the most basic type of data storage in Redis, and it is binary safe in Redis, which means that the type can accept data in any format, such as JPEG image data or JSON object description information. The value of
Version 1 domain: indicates the IP protocol corresponding to the datagram. Currently, it is 4 (representing IPv4, but IPv6 may have to replace IPv4)
2 Header Length: 4 bits, IP header length, indicating the number of 32 bits contained in the
In general, for network programming, we only need to call encapsulated functions or components to complete most of the work, but in some special cases, we need to have a deep understanding.
Network Packet structure and protocol analysis. Such as
Do not allow Win10 to automatically restart the computer after installing updates.
After Windows 10 is installed and updated, you usually need to restart the computer to complete the update and installation. The default installation and update
In general, we only need to call encapsulated functions or components for network programming. However, in some special cases, it is necessary to thoroughly understand the structure of network data packets and protocol analysis. Such as network
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