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我试图创建一个程序在后台运行一个shell并发送用户命令给它执行并返回结果。这是代码:交互式popen()Lua调用
--note: this runs on windows but I assume replacing "cmd" with "sh" it can run on linux as well
exe,err=io.popen("cmd > stdout.txt 2> stderr.txt");
if not exe then
print("Could not run command. Error: "..err)
return
else
print("Command run successfully... ready!")
end
stdout,err=io.open("stdout.txt","r")
if not stdout then print("Could not open stdout: "..err) return end
stderr,err=io.open("stderr.txt","r")
if not stdout then print("Could not open stderr: "..err) return end
function execute(str)
exe:write(str)
return stdout:read("*all") or stderr:read("*all") or "nil"
end
repeat
print("COMMAND: ")
userinput=io.read("*line")
print("You entered: '"..userinput.."'")
if userinput=="" then print "Empty line! Exiting program..." break end
print("Result: "..execute(userinput))
until true
print "Closing..."
execute("exit")
print "1"
exe:close()
print "2"
stdout:close()
print "3"
stderr:close()
print "Finished!"
问题:退出程序时,它挂在exe:close()
调用。执行循环的表现也很奇怪(有时我必须按几次输入才能使userinput=io.read("*line")
工作。
我用google搜索了解file:close()是否也适用于io.popen()的结果文件句柄但没有发现任何东西,但这一呼吁并没有失败这只是挂断换句话说程序的输出是这样的:。
Command run successfully... ready!
COMMAND:
dir
dir
You entered: 'dirdir'
Result: Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\lua>
C:\lua>
C:\lua>
Closing...
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