16 bytes

1. OriginThe full name of MD5 is message-Digest algorithm 5 (Information-AbstractAlgorithmAt the beginning of 1990s, MIT LaboratoryDeveloped by Ronald L. Rivest of for computer science and RSA Data Security Inc,Developed by md2, md3, and md4. Http://

The following table summarizes the data types of all available fields in Microsoft Access, their usage, and storage space. Data Type Usage Big and small "Text"(Text) A combination of text or numbers, such as

GUID (Global unique identifier) is a globally unique identifier, which consists of the ID numbers on the NIC (each Nic has a unique ID number) and a 16-byte binary value generated by the unique number of the CPU clock.The GUID format is

GUID (Global unique identifier) is a globally unique identifier, which consists of the ID numbers on the NIC (each Nic has a unique ID number) and a 16-byte binary value generated by the unique number of the CPU clock. The GUID format is

1. HeadThe head is a key component of the hard disk to read data. Its main function is to convert the magnetic information stored on the disk to an electrical signal for external transmission, the working principle is that the resistance value of

I think this is a bug in the VC compiler. The inclusion sequence of header files should not cause exceptions during runtime. The same problem exists in both vs2008 and vc6, but everything works normally in C-free (using the GCC compiler. The

Determining the size of a Class ObjectBy Girish Shetty There are using factors that decide the size of an object of a class in C ++. These factors are:Size of all non-static data membersOrder of data membersByte alignment or byte paddingSize of its

This article is very detailed, the original article: http://hi.baidu.com/waybq/blog/item/3b8db64bef3dc7f583025c66.html --------------------------------------------------------------------------- Hard Disks are one of the most commonly used storage

The ATL window process adopts a call mechanism called thunk to solve the following problems:To create a window by using a UI thread, register a window class, create a window, and display a window. The corresponding API functions are registerclass,

I have made some optimizations on the memory usage of the program recently, and have achieved good results. I have summarized some experiences. I believe it will be helpful for you to write high-quality programs. The following discussion is not

The following articles mainly describe that the guid value is used as the row identifier in the SQL server data table. The GUID (Global unique identifier) is a globally unique identifier) it is a 16-byte binary value generated by the ID number on

Unicode Character Set is generated to solve the incompatibility problem of character sets. All its characters are expressed in two bytes, that is, English characters are also expressed in two bytes. If you are still struggling with this issue, let's

S50Non-contactICCard Performance Overview (M1) I,Main indicators L size: 8 K-bit EEPROM (1 K bytes) L divided into 16 sectors, each of which is 4 blocks, each with 16 bytes, block as the unit of access L each slice has an independent set of

Sys_guid () is a function provided after Oracle 8i. Sys_guid is generated and returns a globally unique identifier (original value) consisting of 16 bytes. On most platforms, the generated identifier consists of the host identifier, the process or

Int * mallocedmemory = (int *) malloc (1024 + 15 ); Alignedmemory = (int *) (INT) mallocedmemory + 15 )&~ 15 ); (Void **) alignedmemory) [-1] = mallocedmemory;Return alignedmemory; + 15 instead of + 16 For example, the address 0x00 + 15 is

A disk consists of disks, cylinders, tracks, and sectors. The relationship between them is that a track is formed by a small sector (512 bytes per sector) in a circle, and a disc is projected from the disk to the bottom of the track, that is, a

Linux disk management 1: Linux disk managementLinux disk management:MBR: Master Boot Record (512 bytes)Master Boot RecordMain Boot Record446 bytes: BootLoader, system boot program64 bytes:16 bytes: indicates a partition for each 16 bytes.2 bytes:

[Feature matching] The Sub-principle and source code analysis of BRIEF feature description. Related: Fast principle and source code analysis Harris principle and source code analysis Principle and source code analysis of SIFT Principle and source

Primary Key and foreign key in the database, primary key of the database 1. What are primary keys and Foreign keys: A record in a relational database has several attributes. If one of the attribute groups (note that it is a group) uniquely

The following method is a general summary of the massive data processing methods. Of course, these methods may not completely cover all the problems, however, such methods can basically deal with the vast majority of problems encountered. The