在lua中读取控制台输出实时 [英] Read console output realtime in lua
问题描述
如何在运行时定期读取脚本的输出?
How can I manage to periodically read the output of a script while it is running?
在youtube-dl的情况下,它会发送下载信息速度/ eta)关于正在下载到终端的视频。
In the case of youtube-dl, it sends download information (progress/speed/eta) about the video being downloaded to the terminal.
使用以下代码,我能够捕获脚本输出(在linux上)的总结果临时文件:
With the following code I am able to capture the total result of the scripts output (on linux) to a temporary file:
tmpFile = io.open("/tmp/My_Temp.tmp", "w+")
f = io.popen("youtube-dl http://www.youtube.com/watch?v=UIqwUx_0gJI", 'r')
tmpFile:write(f:read("*all"))
不等待脚本完成并写入所有数据像是能够捕获youtube-dl发送到终端的最新信息的快照。
Instead of waiting for the script to complete and writing all the data at the end, I would like able to capture "snapshots" of the latest information that youtube-dl has sent to the terminal.
我的总体目标是捕获下载信息,以设计进度条使用Iup。
My overall goal is to capture the download information in order to design a progress bar using Iup.
如果有更聪明的方式捕获下载信息,我也很乐意接受建议。
If there are more intelligent ways of capturing download information I will be happy to take advice as well.
无论如何,如果可以使用io.popen(),os.execute()或其他工具,我仍然想知道如何捕获实时控制台输出。
Regardless, if it is possible to use io.popen(), os.execute(), or other tools in such a way I would still like to know how to capture the real time console output.
推荐答案
这在Windows和Linux上都可以正常工作。线实时显示。
This works fine both on Windows and Linux. Lines are displayed in real-time.
local pipe = io.popen'ping google.com'
for line in pipe:lines() do
print(line)
end
pipe:close()
UPD:
如果以前的代码不起作用,请尝试以下操作(建议如下):
UPD :
If previous code didn't work try the following (as dualed suggested):
local pipe = io.popen'youtube-dl with parameters'
repeat
local c = pipe:read(1)
if c then
-- Do something with the char received
io.write(c) io.flush()
end
until not c
pipe:close()
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