Low-byte High-byte order

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Ok.. so I made a server-socket based tetris game using the winsock2 Windows Socket API. I finished the program, it works fine, and i actually have no problem in setting up the socket or the WSA. But there's something i don't understand from the winsock2 API. The function MAKEWORD(BYTE bLow,BYTE bHigh).
What does it mean? Can anyone give me a good example of what does this function mean.
I've looked up for the macro, i don't have any problem understanding it. the only problem is i don't understand the concept of MAKEWORD or what is it for.
can anyone help me?
Any help would be really appreciated.

Posted 3-Jan-13 22:37pm

yudhistira dewanata

Updated 3-Jan-13 22:39pm

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CPallini · Accepted Answer · 2013-01-03T22:43:00

Solution 1

The documentation [^] says it all: "Creates a WORD value by concatenating the specified (byte) values".
It is just an auxiliary macro, useful if you have two bytes and need to 'glue' them in a word. A similar macro (whose usefulness is apparent) is RGB[^].

Posted 3-Jan-13 22:43pm

CPallini

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fjdiewornncalwe 4-Jan-13 16:43pm

+5.

H.Brydon · Accepted Answer · 2013-01-04T06:10:00

A BYTE contains 8 (usable) bits. In this context, a WORD contains 16 bits or 2 BYTEs. These can be represented as

           +--------+--------+
2 BYTEs    |bbbbbbbb|bbbbbbbb|
           +--------+--------+
1 WORD     +wwwwwwww wwwwwwww|
           +--------+--------+

You can build a WORD out of 2 BYTEs. There is an upper BYTE and lower BYTE. The macro you describe does exactly that.

Low-byte High-byte order

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Low-byte High-byte order

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