问题描述
我最近开始学习c ++和汇编语言，当我在IDA中反汇编某些内容并用伪代码查看该功能时，我遇到了LOBYTE.
i recently started learning c++ and assembly and i came across LOBYTE when i disassembled something in IDA and viewed the function in pseudo code.
阅读msdn: http://msdn.microsoft.com/zh-CN/library/windows/desktop/ms632658(v = vs.85).aspx
我还是不明白.什么是低位字节?有人可以告诉我更多关于它的用途以及在c ++中的用法示例吗?
i still dont understand.What is a low order byte? Can someone tell me more on what its used for and an example of its usage in c++ ?
推荐答案
LOBYTE 和 HIBYTE 以及 HIWORD 和 LOWORD 是用于从较大的一组字节/单词中提取一个单词或一个字节的宏.
LOBYTE and HIBYTE along with HIWORD and LOWORD, are macros used to extract a word or a byte from a larger set of bytes/words.
作为一个例子，假设您有两个字节 24 FF ，它们组成一个单词.您已将此值存储在程序中的 unsigned short ushortvar 中.现在，您可以使用 HIBYTE(ushortvar)或 LOBYTE(ushortvar)提取两个字节之一.第一个等于 0x24 ，第二个等于 0xff .您可以分别使用 LOWORD 和 HIWORD ，对 unsigned int 进行相同操作以提取单词中的一个.
As an example, say you have the two bytes 24 FF, which make a word. You have this value stored in a unsigned short ushortvar in your program. Now you can extract either of the two bytes by using HIBYTE(ushortvar) or LOBYTE(ushortvar). The first will be equal to 0x24, and the latter will be equal to 0xff. You can do the same with a unsigned int to extract a one of the words by using LOWORD respectively HIWORD.
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