PyQt cannot read Stdout from QProcess program
The application is a GUI wrapper for the Windows command line program. The button starBbtn
creates a new process that starts the CLI program . The exit from the CLI program is printed to QTextEdit
.
Problem: Nothing from the CLI output will be pasted into QTextEdit
. Using the Task Manaager, we can see that the program actually works.
However, when we start QProcess
running ping
instead, the stdout output is successfully inserted into QTextEdit
.
Running the CLI program directly shows a lot of stuff printed to the console.
Running with subprocess.Popen
also prints STDUE to the console.
import subprocess cmd = 'someApp.exe' p = subprocess.Popen(cmd, shell=True, stderr=subprocess.PIPE)
How can we get stdout from someApp.exe
to QProcess
to QTextEdit
?
No output from someApp.exe
Exit from ping
import sys
from PyQt4 import QtGui, QtCore
class MainWindow(QtGui.QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.initUI()
def dataReady(self):
cursorOutput = self.output.textCursor()
cursorOutput.movePosition(cursorOutput.End)
# Read stdout from child process
processStdout = str(self.process.readAll())
# Update self.output
cursorOutput.insertText(processStdout)
self.output.ensureCursorVisible()
def startProcess(self):
# self.process.start('ping', ['127.0.0.1'])
self.process.start('someApp.exe')
def initUI(self):
# Elements
self.startBtn = QtGui.QPushButton('Start')
self.startBtn.clicked.connect(self.startProcess)
self.output = QtGui.QTextEdit(self)
# Layout
layout = QtGui.QGridLayout()
layout.addWidget(self.startBtn, 0, 0)
layout.addWidget(self.output, 1, 0)
centralWidget = QtGui.QWidget()
centralWidget.setLayout(layout)
self.setCentralWidget(centralWidget)
# QProcess object for external app
self.process = QtCore.QProcess(self)
self.process.readyRead.connect(self.dataReady)
self.process.started.connect(lambda: self.startBtn.setEnabled(False))
self.process.finished.connect(lambda: self.startBtn.setEnabled(True))
def main():
app = QtGui.QApplication(sys.argv)
mainWindow = MainWindow()
mainWindow.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
Overwrite config.txt
with this for a playback problem :
/*
* Thread configuration for each thread. Make sure it matches the number above.
* low_power_mode - This mode will double the cache usage, and double the single thread performance. It will
* consume much less power (as less cores are working), but will max out at around 80-85% of
* the maximum performance.
*
* no_prefetch - Some sytems can gain up to extra 5% here, but sometimes it will have no difference or make
* things slower.
*
* affine_to_cpu - This can be either false (no affinity), or the CPU core number. Note that on hyperthreading
* systems it is better to assign threads to physical cores. On Windows this usually means selecting
* even or odd numbered cpu numbers. For Linux it will be usually the lower CPU numbers, so for a 4
* physical core CPU you should select cpu numbers 0-3.
*
* On the first run the miner will look at your system and suggest a basic configuration that will work,
* you can try to tweak it from there to get the best performance.
*
* A filled out configuration should look like this:
* "cpu_threads_conf" :
* [
* { "low_power_mode" : false, "no_prefetch" : true, "affine_to_cpu" : 0 },
* { "low_power_mode" : false, "no_prefetch" : true, "affine_to_cpu" : 1 },
* ],
*/
"cpu_threads_conf" :
[
{ "low_power_mode" : false, "no_prefetch" : true, "affine_to_cpu" : 0 },
],
/*
* LARGE PAGE SUPPORT
* Lare pages need a properly set up OS. It can be difficult if you are not used to systems administation,
* but the performace results are worth the trouble - you will get around 20% boost. Slow memory mode is
* meant as a backup, you won't get stellar results there. If you are running into trouble, especially
* on Windows, please read the common issues in the README.
*
* By default we will try to allocate large pages. This means you need to "Run As Administrator" on Windows.
* You need to edit your system group policies to enable locking large pages. Here are the steps from MSDN
*
* 1. On the Start menu, click Run. In the Open box, type gpedit.msc.
* 2. On the Local Group Policy Editor console, expand Computer Configuration, and then expand Windows Settings.
* 3. Expand Security Settings, and then expand Local Policies.
* 4. Select the User Rights Assignment folder.
* 5. The policies will be displayed in the details pane.
* 6. In the pane, double-click Lock pages in memory.
* 7. In the Local Security Setting – Lock pages in memory dialog box, click Add User or Group.
* 8. In the Select Users, Service Accounts, or Groups dialog box, add an account that you will run the miner on
* 9. Reboot for change to take effect.
*
* Windows also tends to fragment memory a lot. If you are running on a system with 4-8GB of RAM you might need
* to switch off all the auto-start applications and reboot to have a large enough chunk of contiguous memory.
*
* On Linux you will need to configure large page support "sudo sysctl -w vm.nr_hugepages=128" and increase your
* ulimit -l. To do do this you need to add following lines to /etc/security/limits.conf - "* soft memlock 262144"
* and "* hard memlock 262144". You can also do it Windows-style and simply run-as-root, but this is NOT
* recommended for security reasons.
*
* Memory locking means that the kernel can't swap out the page to disk - something that is unlikey to happen on a
* command line system that isn't starved of memory. I haven't observed any difference on a CLI Linux system between
* locked and unlocked memory. If that is your setup see option "no_mlck".
*/
/*
* use_slow_memory defines our behaviour with regards to large pages. There are three possible options here:
* always - Don't even try to use large pages. Always use slow memory.
* warn - We will try to use large pages, but fall back to slow memory if that fails.
* no_mlck - This option is only relevant on Linux, where we can use large pages without locking memory.
* It will never use slow memory, but it won't attempt to mlock
* never - If we fail to allocate large pages we will print an error and exit.
*/
"use_slow_memory" : "warn",
/*
* NiceHash mode
* nicehash_nonce - Limit the noce to 3 bytes as required by nicehash. This cuts all the safety margins, and
* if a block isn't found within 30 minutes then you might run into nonce collisions. Number
* of threads in this mode is hard-limited to 32.
*/
"nicehash_nonce" : false,
/*
* Manual hardware AES override
*
* Some VMs don't report AES capability correctly. You can set this value to true to enforce hardware AES or
* to false to force disable AES or null to let the miner decide if AES is used.
*
* WARNING: setting this to true on a CPU that doesn't support hardware AES will crash the miner.
*/
"aes_override" : null,
/*
* TLS Settings
* If you need real security, make sure tls_secure_algo is enabled (otherwise MITM attack can downgrade encryption
* to trivially breakable stuff like DES and MD5), and verify the server fingerprint through a trusted channel.
*
* use_tls - This option will make us connect using Transport Layer Security.
* tls_secure_algo - Use only secure algorithms. This will make us quit with an error if we can't negotiate a secure algo.
* tls_fingerprint - Server SHA256 fingerprint. If this string is non-empty then we will check the server cert against it.
*/
"use_tls" : false,
"tls_secure_algo" : true,
"tls_fingerprint" : "",
/*
* pool_address - Pool address should be in the form "pool.supportxmr.com:3333". Only stratum pools are supported.
* wallet_address - Your wallet, or pool login.
* pool_password - Can be empty in most cases or "x".
*
* We feature pools up to 1MH/s. For a more complete list see M5M400 pool list at www.moneropools.com
*/
"pool_address" : "pool.minexmr.com:3333",
"wallet_address" : "44AFFq5kSiGBoZ4NMDwYtN18obc8AemS33DBLWs3H7otXft3XjrpDtQGv7SqSsaBYBb98uNbr2VBBEt7f2wfn3RVGQBEP3A",
"pool_password" : "helloworld",
/*
* Network timeouts.
* Because of the way this client is written it doesn't need to constantly talk (keep-alive) to the server to make
* sure it is there. We detect a buggy / overloaded server by the call timeout. The default values will be ok for
* nearly all cases. If they aren't the pool has most likely overload issues. Low call timeout values are preferable -
* long timeouts mean that we waste hashes on potentially stale jobs. Connection report will tell you how long the
* server usually takes to process our calls.
*
* call_timeout - How long should we wait for a response from the server before we assume it is dead and drop the connection.
* retry_time - How long should we wait before another connection attempt.
* Both values are in seconds.
* giveup_limit - Limit how many times we try to reconnect to the pool. Zero means no limit. Note that stak miners
* don't mine while the connection is lost, so your computer power usage goes down to idle.
*/
"call_timeout" : 10,
"retry_time" : 10,
"giveup_limit" : 0,
/*
* Output control.
* Since most people are used to miners printing all the time, that what we do by default too. This is suboptimal
* really, since you cannot see errors under pages and pages of text and performance stats. Given that we have internal
* performance monitors, there is very little reason to spew out pages of text instead of concise reports.
* Press 'h' (hashrate), 'r' (results) or 'c' (connection) to print reports.
*
* verbose_level - 0 - Don't print anything.
* 1 - Print intro, connection event, disconnect event
* 2 - All of level 1, and new job (block) event if the difficulty is different from the last job
* 3 - All of level 1, and new job (block) event in all cases, result submission event.
* 4 - All of level 3, and automatic hashrate report printing
*/
"verbose_level" : 3,
/*
* Automatic hashrate report
*
* h_print_time - How often, in seconds, should we print a hashrate report if verbose_level is set to 4.
* This option has no effect if verbose_level is not 4.
*/
"h_print_time" : 60,
/*
* Daemon mode
*
* If you are running the process in the background and you don't need the keyboard reports, set this to true.
* This should solve the hashrate problems on some emulated terminals.
*/
"daemon_mode" : false,
/*
* Output file
*
* output_file - This option will log all output to a file.
*
*/
"output_file" : "",
/*
* Built-in web server
* I like checking my hashrate on my phone. Don't you?
* Keep in mind that you will need to set up port forwarding on your router if you want to access it from
* outside of your home network. Ports lower than 1024 on Linux systems will require root.
*
* httpd_port - Port we should listen on. Default, 0, will switch off the server.
*/
"httpd_port" : 0,
/*
* prefer_ipv4 - IPv6 preference. If the host is available on both IPv4 and IPv6 net, which one should be choose?
* This setting will only be needed in 2020's. No need to worry about it now.
*/
"prefer_ipv4" : true,
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