什么是“const char far * inStrSource”意思？ [英] What does "const char far* inStrSource" mean?

问题描述

我关注有关引导加载程序的文章，

（ http://www.codeproject.com/KB/tips/boot-loader.aspx?msg=3745692#xx3745692xx ）

我发现这个部分：

I'm following article about boot loader,
( http://www.codeproject.com/KB/tips/boot-loader.aspx?msg=3745692#xx3745692xx )
and I found this part:

"const char far* inStrSource"

整个事物：

typedef unsigned char   byte;
typedef unsigned short  word;
typedef unsigned long   dword;
typedef char            bool;

byte CString::Strlen( const char far* inStrSource )
{
        byte lenghtOfString = 0;

        while(*inStrSource++ != '\0')
        {
            ++lenghtOfString;
        }
        return lenghtOfString;
}

任何人都可以解释我，为什么他将char类型定义为bool，这个指针事件发生了什么？

Can anyone explain me please, why does he define char type as bool, and what is going on with this pointer thing?

MVC ++ 10将这些视为错误（typedef char bool和char far * intSource），但是用16bit VC 1.52工程

MVC++ 10 recognize those as an error ( typedef char bool, and char far* intSource), however compiling with 16bit VC 1.52 works with no doubt.

推荐答案

这是一个 far指针：一个可以比< em>正常指针更长的指针（即：获取更多的位）。

It's a far pointer: a pointer which can be longer (ie: take more bits) than normal pointers.

它用于表示不能被正常指针寻址的存储单元（即：如果系统上的指针由8位组成，则只能引用最多2 ^ 8个存储单元;如果需要寻址更多内存你可以使用far指针）。

It's used to refer memory cells which couldn't be addressed by normal pointers (ie: if pointers on your systems are made of 8 bits, you can only refer up to 2^8 memory cells; if you need to address more memory you could use a far pointer).

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