stdout

问题 I'm using ffmpeg in node js. Both the standard terminal output and the error seems to be sent to stdout, so I don't know how to differentiate between error and success... Here's my code: var convertToMp3 = function(filePath) { var ffmpeg = child_process.spawn('ffmpeg',['-i', filePath, '-y', 'output.mp3']); var err = ''; ffmpeg.stderr .on('data', function(c) { err += c; }) .on('end', function() { console.log('stderr:', err); }); var d = ''; ffmpeg.stdout .on('data', function(c){d +=c;}) .on(

问题 I am attempting to stream output from a weighing scale that is written in python. This program (scale.py) runs continuously and prints the raw value every half second. import RPi.GPIO as GPIO import time import sys from hx711 import HX711 def cleanAndExit(): print "Cleaning..." GPIO.cleanup() print "Bye!" sys.exit() hx = HX711(5, 6) hx.set_reading_format("LSB", "MSB") hx.reset() hx.tare() while True: try: val = hx.get_weight(5) print val hx.power_down() hx.power_up() time.sleep(0.5) except

问题 I have lines for line in fileinput.input(file_full_path, inplace=True): newline, count = re.subn(search_str, replace_str, line.rstrip()) # ... display some messages to console ... print newline # this is sent to the file_full_path which are supposed to replace all occurrences of search_str in the file file_full_path and replace them with replace_str . The fileinput maps stdout to the given file. So, print newline and things sent to sys.stdout are sent to the file and not to the console. I

问题 I have lines for line in fileinput.input(file_full_path, inplace=True): newline, count = re.subn(search_str, replace_str, line.rstrip()) # ... display some messages to console ... print newline # this is sent to the file_full_path which are supposed to replace all occurrences of search_str in the file file_full_path and replace them with replace_str . The fileinput maps stdout to the given file. So, print newline and things sent to sys.stdout are sent to the file and not to the console. I

问题 In my QT application, I want to have it so some real-time information prints in the terminal if I run the application from the terminal. When I use printf("print this") (either in main or during the paint event), it doesn't print until I close the gui. Why is this, and how can I have it print information in real-time? (I'm using linux) Thanks! 回答1: To write to stdout, you should add this CONFIG += console to your project file config and use cout of printf for your liking. qDebug prints by

问题 In my QT application, I want to have it so some real-time information prints in the terminal if I run the application from the terminal. When I use printf("print this") (either in main or during the paint event), it doesn't print until I close the gui. Why is this, and how can I have it print information in real-time? (I'm using linux) Thanks! 回答1: To write to stdout, you should add this CONFIG += console to your project file config and use cout of printf for your liking. qDebug prints by

问题 I am trying to redirect "sys.stdout" to QTextEdit , here is my code: class Communicate(QObject): printText = pyqtSignal() def write(self, text): self.printText.emit(str(text)) class UI(QWidget): def __init__(self, parent = None): QWidget.__init__(self) ... self.textedit = QTextEdit(self) self.textedit.setGeometry(400,20,220,300) self.c = Communicate() self.c.printText.connect(self.textedit.insertPlainText) sys.stdout = self.c if __name__ == "__main__": ... When I ran the code, I got TypeError

问题 I am trying to redirect "sys.stdout" to QTextEdit , here is my code: class Communicate(QObject): printText = pyqtSignal() def write(self, text): self.printText.emit(str(text)) class UI(QWidget): def __init__(self, parent = None): QWidget.__init__(self) ... self.textedit = QTextEdit(self) self.textedit.setGeometry(400,20,220,300) self.c = Communicate() self.c.printText.connect(self.textedit.insertPlainText) sys.stdout = self.c if __name__ == "__main__": ... When I ran the code, I got TypeError

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 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