Real-time value display

[KOHAK]

import sys

# On Windows it looks like cp850 is used for my console. We need it to decode the QByteArray correctly.
# Based on https://forum.qt.io/topic/85064/qbytearray-to-string/2
import ctypes
CP_console = "cp" + str(ctypes.cdll.kernel32.GetConsoleOutputCP())

from PyQt5 import QtCore, QtGui, QtWidgets

class gui(QtWidgets.QMainWindow):
    def __init__(self):
        super(gui, self).__init__()
        self.initUI()

    def dataReady(self):
        cursor = self.output.textCursor()
        cursor.movePosition(cursor.End)

        # Here we have to decode the QByteArray
        cursor.insertText(str(self.process.readAll().data().decode(CP_console)))
        self.output.ensureCursorVisible()

    def callProgram(self):
        # run the process
        # `start` takes the exec and a list of arguments
        self.process.start('ipconfig')

    def initUI(self):
        # Layout are better for placing widgets
        layout = QtWidgets.QVBoxLayout()
        self.runButton = QtWidgets.QPushButton('Run')
        self.runButton.clicked.connect(self.callProgram)

        self.output = QtWidgets.QTextEdit()

        layout.addWidget(self.output)
        layout.addWidget(self.runButton)

        centralWidget = QtWidgets.QWidget()
        centralWidget.setLayout(layout)
        self.setCentralWidget(centralWidget)

        # QProcess object for external app
        self.process = QtCore.QProcess(self)
        # QProcess emits `readyRead` when there is data to be read
        self.process.readyRead.connect(self.dataReady)

        # Just to prevent accidentally running multiple times
        # Disable the button when process starts, and enable it when it finishes
        self.process.started.connect(lambda: self.runButton.setEnabled(False))
        self.process.finished.connect(lambda: self.runButton.setEnabled(True))


#Function Main Start
def main():
    app = QtWidgets.QApplication(sys.argv)
    ui=gui()
    ui.show()
    sys.exit(app.exec_())
#Function Main END

if __name__ == '__main__':
    main()

The above is a code found on the Internet.
I want to change the ping command in that content to the code that runs Java below. Can you help me?

java -Xms16G -Xmx16G -jar spigot.jar

[jsulm]

@KOHAK said in Real-time value display:

Can you help me?

Did you read https://doc.qt.io/qt-5/qprocess.html ? There is also an example. Else please say what exactly is the problem.

[KOHAK]

@jsulm ```
import sys

On Windows it looks like cp850 is used for my console. We need it to decode the QByteArray correctly.

Based on https://forum.qt.io/topic/85064/qbytearray-to-string/2

import ctypes
CP_console = "cp" + str(ctypes.cdll.kernel32.GetConsoleOutputCP())

from PyQt5 import QtCore, QtGui, QtWidgets

class gui(QtWidgets.QMainWindow):
def init(self):
super(gui, self).init()
self.initUI()

def dataReady(self):
    cursor = self.output.textCursor()
    cursor.movePosition(cursor.End)

    # Here we have to decode the QByteArray
    cursor.insertText(str(self.process.readAll().data().decode(CP_console)))
    self.output.ensureCursorVisible()

def callProgram(self):
    # run the process
    # `start` takes the exec and a list of arguments
    self.process.start('java -Xms16G -Xmx16G -jar spigot.jar')

def initUI(self):
    # Layout are better for placing widgets
    layout = QtWidgets.QVBoxLayout()
    self.runButton = QtWidgets.QPushButton('Run')
    self.runButton.clicked.connect(self.callProgram)

    self.output = QtWidgets.QTextEdit()

    layout.addWidget(self.output)
    layout.addWidget(self.runButton)

    centralWidget = QtWidgets.QWidget()
    centralWidget.setLayout(layout)
    self.setCentralWidget(centralWidget)

    # QProcess object for external app
    self.process = QtCore.QProcess(self)
    # QProcess emits `readyRead` when there is data to be read
    self.process.readyRead.connect(self.dataReady)

    # Just to prevent accidentally running multiple times
    # Disable the button when process starts, and enable it when it finishes
    self.process.started.connect(lambda: self.runButton.setEnabled(False))
    self.process.finished.connect(lambda: self.runButton.setEnabled(True))

#Function Main Start
def main():
app = QtWidgets.QApplication(sys.argv)
ui=gui()
ui.show()
sys.exit(app.exec_())
#Function Main END

if name == 'main':
main()

This code is not working Is it possible to resolve it?

[jsulm]

@KOHAK said in Real-time value display:

self.process.start('java -Xms16G -Xmx16G -jar spigot.jar')

That should be

self.process.start('java', ['-Xms16G', '-Xmx16G', '-jar', 'spigot.jar'])

Please read documentation to do it correctly.

Add error handling to your code to see what exactly happens, else only guessing is possible.
See https://doc.qt.io/qt-5/qprocess.html#errorOccurred

And I guess you have to provide absolute path to the java executable.