pipe

select.select issue for sockets and pipes

由 为君一笑 提交于 2020-01-15 18:32:08
问题 I am currently in the process of writing a basic python script that makes use of both pipes and sockets. The pipe currently holds incoming data from an html form, the socket makes up a connection to a server that sends TCP/IP commands at various intervals. The form and server are on the same LAN but different computers. The code I have is as follows: #!/usr/bin/env python import os,sys,time from socket import * HOST = 'xxx.xxx.xxx.xxx' PORT = 6000 BUFSIZ = 1024 ADDR = (HOST, PORT) tcpCliSock

Multiple unix pipes not working

由 我的未来我决定 提交于 2020-01-15 11:15:52
问题 This first pipeline works fine (printing "c"): echo "a" | sed 's/a/b/' | sed 's/b/c/' This one does not do what I expect (nothing gets printed when I feed an "a" into my fifo ): mkfifo fifo; cat fifo | sed 's/a/b/' | sed 's/b/c/' However, if I remove the second "sed" command from the latter pipeline, I do get a "b" printed. I think my understanding of pipes and redirects must be too simplistic. Can someone explain to me how to fix the 2nd case so that I can run two successive commands on the

google-bigquery Error while specifying pipe delimiter in bq load command on windows

由 ぃ、小莉子 提交于 2020-01-15 09:50:07
问题 I am trying to load a PIPE delimited file and running bq load command from windows platform. It is not accepting pipe delimiter in the command. E.g. I am trying to use -F operator to specify the delimiter and could specify space delimiter but it stops working when I specify pipe delimiter. C:\Windows>bq load -F" " "cmdwh_bq_prod.testtabPIPE" "c:\temp\testPIPE.txt" PlatformVersion:int64,AnalyticsSessionID:int64,OutletGroup:string Upload complete. ..... rest of the processing...... ..... rest

How do I access these weird JSON items with jQuery? [duplicate]

由 廉价感情. 提交于 2020-01-15 05:40:11
问题 This question already has an answer here : Closed 7 years ago . Possible Duplicate: Selecting a JSON object with a colon in the key I apologize if this is a duplicate question. I searched, I really did! What I'm trying to achieve is a simple date re-format into something nicer like "Friday, March 9, 2012". I would LOVE to use one of the many convenient jQuery plugins to parse the readily available "pubDate" value into something more useful. Unfortunately there are forces preventing me from

Python: Use input from another command

由 馋奶兔 提交于 2020-01-14 10:39:09
问题 I am wondering how can I manage input from another command from a python script. Example: $ cat myfile.txt | my_python_script.py How can my script manage the input stream from the cat command ? How Can I get an input from this piped commands ? ... Thanks a lot. 回答1: An easy and quite versatile way to accomplish this is to use the fileinput module. import fileinput for line in fileinput.input() # do things with line This way you can both use the script in a pipeline (as you need to right now)

Cucumber: pipe output without losing color

由 余生长醉 提交于 2020-01-14 10:08:34
问题 I'm using cucumber to run some tests. It colorizes its output using ANSI escapes. This is great, but currently its producing more output than I care about, and shoving things I do care about off the screen. There doesn't seem to be a way to eliminate the other lines from within cucumber, but I can pipe the output through grep to pare down to the ones I care about. The downside of this solution, though, is that all the colors are lost. I know it's not my shell or grep's fault, because % echo "

Angular 5 - currencyPipe

由 ￡可爱￡侵袭症＋ 提交于 2020-01-14 08:00:30
问题 I have a problem with the already built in CurrencyPipe from Angular. I need to display a currency sign using the CurrencyPipe but I can't use it unless I provide an input number. Because the CurrencyPipe uses the current locale to get the currency sign, I was thinking that the input number could be optional. Current Behaviour: {{ 1 | currency:'USD' }} --> $1 Needed Behaviour: {{ null | currency:'USD' }} --> $ Does any of you know if this is possible with the default Pipe? Thanks!! 回答1:

popen to pass binary data between processes

由 走远了吗. 提交于 2020-01-14 05:49:06
问题 I am facing issue in passing binary data between processes. My program opens a pipe to ffmpeg using popen() and tries to capture the output and then stream it as HTTP server. I am doing something like this ffmpeg -i "input_video.avi" -ab 56 -ar 44100 -b 1500000 -r 25 -s 800x600 -f flv - (Output filename "-" diverts the output to stdout) After opening I am using fread() to read the pipe. I can read it and my program streams content, when I downloaded the file on my browser, it completed, but

Python并发编程-管道

由 非 Y 不嫁゛ 提交于 2020-01-14 03:11:15
管道的作用- 两个进程间传递消息 from multiprocessing import Pipe, Process def func(conn1,conn2): conn2.close() #子进程只需使用connection1,故关闭connection2 while True: try: msg = conn1.recv() print(msg) except EOFError: #没收数据接收的时候,才抛出的异常 conn1.close() break if __name__ == '__main__': conn1,conn2 = Pipe()#建立一个管道,管道返回两个connection Process(target=func, args=(conn1,conn2)).start() conn1.close() #主进程只需要一个connection,故关闭一个 for i in range(20): conn2.send('吃了吗') #主进程发送 conn2.close() #主进程关闭connection2 管道是进程数据不安全的 pipe有数据不安全性 - 多个消费者同时取一个数据的情况可能发送 通过IPC通讯 解决方法 -加锁 队列是进程数据安全的-队列是基于管道加锁 from multiprocessing import Process,Pipe,Lock

How does one setup a pipe between two child processes in Win32?

由 孤街醉人 提交于 2020-01-14 00:44:09
问题 For the life of me I can't figure out why this is not working. Basically, I created the pipe with the inherit bit set to true, and created two child processes, and used the STARTUPINFO structure to set the input and output handles as one would need, but the pipe seems broken (the second process writes no output to the console, even though output is expected) I know the problem does not lie in my test program ( BitTwiddler.exe ) because I performed the same operation using CMD.exe, and
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