逐行读取文件到数组中

Question

抱歉，我还在学习 lua。你能纠正我吗，为什么文件中的数据不能逐行读取？

这是我在文件 points.txt 中的示例数据：

lexxo:30:1
rey:40:2
lion:40:2
prince:50:3
royal:50:3

所以当我从上面得到的是二维数组(table)

player = {{(name),(points),(which var point earned on index)},
          {(...),(...),(...)}};

所以问题是，当我尝试循环打印文件中的所有数据时。它只打印最后一行。所以我想要打印所有这些

line_points =  {}
player_data = {{}}

local rfile = io.open("points.txt", "r")
for line in rfile:lines() do
    playername, playerpoint, playeridpoint = line:match("^(.-):(%d+):(%d+)$")
    player_data = {{playername, playerpoint, playeridpoint}}
    line_points[#line_points + 1] = player_data
end

for i = 1, #player_data do
    player_checkname = player_data[i][1] -- Get Player Name From Array for checking further
    player_checkpnt = player_data[i][3] -- Get Player ID Point From Array for checking further
    print(i..". Name: "..player_data[i][1].." Point: ".. player_data[i][2] .. " ID: " .. player_data[i][3]);
end

Answer 1

您每次都用新记录覆盖 player_data，集合保存在 line_points 中；然而，在打印时，你的循环上升到 #player_data （这将是 1）并访问 player_data 而不是 line_points.

你可能想做那样的事情¹:

table.insert(player_data, {playername, playerpoint, playeridpoint})

¹ t[#t+1]= 习惯用法也可以，只需使用正确的 table 并注意（去掉）代码中的双括号。

Answer 2

player_data 的索引始终为 1，因为您不将项目添加到 ，而是将它们添加到 line_points，即 #line_points 是5，所以改用它。

这是你想要的吗:?

line_points = {} player_data = {{}} --I think you can delete it at all... --Because it is rewriting each time. local rfile = io.open("points.txt", "r") for line in rfile:lines() do playername, playerpoint, playeridpoint = line:match("^(.-):(%d+):(%d+)$") player_data = {playername, playerpoint, playeridpoint} --I also remover double table here ^^^^^^^^^^^^^^^^^^^ line_points[#line_points + 1] = player_data end --Here i checked counts --print('#pd='..#player_data) --print('#lp='..#line_points) --After it i decided to use line_points instead of player_data for i = 1, #line_points do player_checkname = line_points[i][1] -- Get Player Name From Array for checking further player_checkpnt = line_points[i][3] -- Get Player ID Point From Array for checking further print(i..". Name: "..line_points[i][1].." Point: ".. line_points[i][2] .. " ID: " .. line_points[i][3]); end

输出：

1. Name: lexxo Point: 30 ID: 1 2. Name: rey Point: 40 ID: 2 3. Name: lion Point: 40 ID: 2 4. Name: prince Point: 50 ID: 3 5. Name: royal Point: 50 ID: 3

更新:

将第一个循环中的 player_data assignemnt 更改为单个 table 后，计数始终为 3。

逐行读取文件到数组中

Read file line by line into array

lua

lua-table

luafilesystem