douxun4860 2016-08-23 22:17
浏览 234
已采纳

golang从标准输入中读取长文本

I want to read a long text from os.Stdin, but I can't make it happen. Already read everything in the subject, tried codes that supposed to work. Every method cuts after 4096 characters, no matter what.

Eg. here's a working example. After the first run of the loop, it reads the first 4096 characters, and then waits for more processing each enter, until I end it with an EOF (Ctrl+D). Same thing for fmt.Scan, bufio.NewScanner, bufio ReadLine, ioutil.ReadAll. If I save it to a file, and read it, it works as expected. From stdin it doesn't.

I'm on Arch Linux, 32 bit, Go 1.7, tested in mate-terminal 1.14, tty 8.25, same thing in both of them. And the same thing happens on the hackerrank.com page, I don't know what technology they're using.

Please help!

EDIT:

My input is just a little bit longer than 4096 characters. I checked out the link that Amd shared, and I got the following: my input is only one line containing space separated integers. When I changed the spaces to newlines, it worked. But since the excercise format on hackerrate uses long space-separated lines, the problem is still up, with a refinement.

  • 写回答

1条回答 默认 最新

  • drmy1050 2016-09-20 09:52
    关注

    I was able to solve this thanks to Ian Lance Taylor: https://groups.google.com/forum/#!topic/golang-nuts/ndh-1wdsWYs

    So the 4096 characters is the limit of my system through N_TTY_BUF_SIZE kernel parameter. The same thing worked with cat and Python as well.

    Anyway, on hackerrank.com I was able to solve the same exercise in Python, so I guess they have a wrong configuration for Go, I already asked them to find it out.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

报告相同问题?

悬赏问题

  • ¥20 while循环中OLED显示中断中的数据不正确
  • ¥15 这个视频里的stm32f4代码是怎么写的
  • ¥15 串口发送数据和接收数据
  • ¥15 JNA调用DLL报堆栈溢出错误(0xC00000FD)
  • ¥15 请教SGeMs软件的使用
  • ¥15 自己用vb.net编写了一个dll文件,如何只给授权的用户使用这个dll文件进行打包编译,未授权用户不能进行打包编译操作?
  • ¥50 深度学习运行代码直接中断
  • ¥20 需要完整的共散射点成像代码
  • ¥15 编写vba代码实现数据录入工作
  • ¥15 做过TCL海信电视小米电视相关影视会员软件私我