以二进制格式将数字写入lua文件 [英] Write numbers to a file in lua in binary format

问题描述

我有一个很大的数组，我想写一个文件。

I have a big array with numbers I would like to write to a file.

但如果我这样做：

local out = io.open("file.bin", "wb")
local i = 4324234
out:write(i)

我只是将数字作为字符串写入文件。如何为要归档的数字写入正确的字节。我怎么能在以后阅读它。

I am just writing the number as a string to the file. How do I write the correct bytes for the number to file. And how can I later read from it.

推荐答案

试试这个

function writebytes(f,x)
    local b4=string.char(x%256) x=(x-x%256)/256
    local b3=string.char(x%256) x=(x-x%256)/256
    local b2=string.char(x%256) x=(x-x%256)/256
    local b1=string.char(x%256) x=(x-x%256)/256
    f:write(b1,b2,b3,b4)
end

writebytes(out,i)

还有这个

function bytes(x)
    local b4=x%256  x=(x-x%256)/256
    local b3=x%256  x=(x-x%256)/256
    local b2=x%256  x=(x-x%256)/256
    local b1=x%256  x=(x-x%256)/256
    return string.char(b1,b2,b3,b4)
end

out:write(bytes(0x10203040))

这些工作用于32位整数，并首先输出最高有效字节。根据需要进行调整。

These work for 32-bit integers and output the most significant byte first. Adapt as needed.

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