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This article is about how C++ converts its byte order. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

0x01 concept

Byte order is the order in which data of more than one byte type is stored in memory.

Note: network byte order is a data representation format specified in TCP/IP, which has nothing to do with the specific CPU type, operating system, etc., so as to ensure that the data can be correctly interpreted when transmitted between different hosts, and the network byte order adopts large-end sorting.

0x02 classification

Byte order is often divided into big end and small end.

Big-Endian: the high-order bytes are placed on the low-address side of the memory, and the low-order bytes are placed on the high-address side of the memory.

Little-Endian (small end): low-order bytes are placed on the low-address side of memory, while high-order bytes are placed on the high-address side of memory.

The difference between the two byte orders of 0x03

Usually our host byte order is a small-end byte order, and the network byte order is a large-end byte order, but why convert it, and what will happen if it is not converted? let's explain it in an inappropriate way here.

Let's assume that we use the big end to send a 16bit data 2, that is, 00000000000010.

Using small-end byte order storage, it looks like this.

And the big-end storage looks like this.

Because 00000010 is stored first, it will be read out first when it is read, and the data becomes 0000001000000000 or 512, rather than the number 2 that you want to enter at that time.

At this time, if you continue to read it in a big-end way, you will get the normal data value.

In C++ programming, we convert it by using htonl, ntohl, htons, and ntohs.

Thank you for reading! This is the end of the article on "how to convert the byte order of C++". I hope the above content can be of some help to you, so that you can learn more knowledge. If you think the article is good, you can share it for more people to see!

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