stdout

问题 In Python, for example, I can do the following: realout = sys.stdout sys.stdout = StringIO.StringIO() some_function() # prints to stdout get captured in the StringIO object result = sys.stdout.getvalue() sys.stdout = realout Can you do this in Go? 回答1: I agree you should use the fmt.Fprint functions if you can manage it. However, if you don't control the code whose output you're capturing, you may not have that option. Mostafa's answer works, but if you want to do it without a temporary file

问题 I am starting a subprocess in python through this command: result = subprocess.Popen([sys.executable, "/subscript.py"] + parameter,stdout=subprocess.PIPE ) result.wait() out, err = result.communicate() for line in out.splitlines(): print line The problem that I am facing with this approach is that all the print statements in subscript.py are kind of buffered till the end and are printed on the terminal at the end of the execution. So if my subscript.py takes about 15 minutes in execution then

问题 I try to create a sub-process using the subprocess module in MAC OS. Below is my code: import subprocess p = subprocess.Popen("app", stdin = subprocess.PIPE, stdout = subprocess.PIPE, stderr = subprocess.PIPE, shell = True) p.stdin.write(bytes("3\n", "ascii")) p.stdin.write(bytes("4\n", "ascii")) print(p.stdout.read()) The source code of app is : #include <iostream> using namespace std; int main() { int x, y; cout << "input x: " << endl; cin >> x; cout << "input y: " << endl; cin >> y; cout <

问题 I am struggling for quite some time with outputting a raw type to standard output. Here is what I tried and did not work the desired way: r <- as.raw(c(0x41, 0x00, 0x43)) # r = "A\0C" cat(rawToChar(r)) # displays warning and skips data after NULL (outputs "A") cat(r) # outputs "41 00 43" writeBin(r, stdout()) # error: can only write to binary connection I am looking for a way to get all three bytes / characters printed to stdout. 回答1: If you are using an operating system that has a 'cat' or

问题 I'm specifically looking for a solution for PuTTY but also interested for other terminal emulators, like Gnome Terminal. My thought is it would be useful if I start a tar zxvf to be able to set a trigger on the terminal emulator, minimize it, and on next output to stdout/stderr I get a notification in the task bar that the command has finished. 回答1: This works for me: echo -e "\a" Then update your PuTTY session to use the Visual Bell, and set "Taskbar/caption indication on bell" to Flashing

问题 I have been trying to figure out a way to take the Tomcat 5.5 stderr and stdout log files and roll them over when they get too large, but I have been unable to do so. Now, please understand this is NOT for web app logging. This is just the stdout and stderr logs that are automatically created by Tomcat. Again, they get too large, and I just need a method to roll them over when they get too large and/or on a time interval (i.e. every day, every hour). I tried using log4j, but that appears to

问题 In Linux bash, I am trying to run a command and grep for an argument: command | grep However, I need to redirect the result of the commad to the stdout and simultaneously pipe it to grep (I need to see both the grep result and the command result in stdout). I googled a bit and tried some variations, such as: command | tee /dev/tty | grep But, no luck. I don't want to use sth like command command | grep as it is ugly :) Thanks, 回答1: Try command | tee >(grep whatever) Note that there's no space

问题 I wrote the following two functions, and call the second ("callAndWait") from JavaScript running inside Windows Script Host. My overall intent is to call one command line program from another. That is, I'm running the initial scripting using cscript, and then trying to run something else (Ant) from that script. function readAllFromAny(oExec) { if (!oExec.StdOut.AtEndOfStream) return oExec.StdOut.ReadLine(); if (!oExec.StdErr.AtEndOfStream) return "STDERR: " + oExec.StdErr.ReadLine(); return

问题 I recently switched OS and am using a newer Python (2.7). On my old system, I used to be able to print instantaneously. For instance, suppose I had a computationally intense for loop: for i in range(10): huge calculation print i then as the code completed each iteration, it would print i However, on my current system, python seems to cache the stdout so that the terminal is blank for several minutes, after which it prints: 1 2 3 in short succession. Then, after a few more minutes, it prints:

问题 The question is pretty simple, yet I can't seem to find how to do it: how do I write to StdOut in Windows/FASM? There does not seem to be any documentation online. Ideas? 回答1: There are a few options... 1) Use the WinAPI. This is either WriteConsole OR by using CreateFile with the filename as CON and then using WriteFile 2) Using msvcrt, and printf as you would in a c program. 来源： https://stackoverflow.com/questions/7263097/how-to-write-to-stdout-in-windows-and-fasm