Latest Questions

Subtraction of two nullptr values guaranteed to be zero?

Is it guaranteed by the C++ standard that if I have two pointers of the same type whose value is equal to nullptr, that the difference between those pointers is

Facing issue while joining a org to the existing channel in hyperledger fabric

We are using Fabric v2.2. Our network setup has 5 channels. Org1 is a part of all the channels. Other than that each channel has 2 individual orgs. So totally 3

How do I update/reload beans server side after ajax events?

I'm trying to set up a Timeline (primefaces element), to display an agenda. Each line is a colleague, with an object "Identite" I created. Each event is an obje

Subtraction of two nullptr values guaranteed to be zero?

Is it guaranteed by the C++ standard that if I have two pointers of the same type whose value is equal to nullptr, that the difference between those pointers is

How to set background color from parameter in jasper report designer

I am using jasper report for designing report. I have a report where there is a static text. I want to set the background color of it by parameter value. In the

Debugging undefined is not an object (evaluating 'Object.keys(routeConfigs)')

I'm using Expo and React Native to create a simple iOS app. I am currently getting this error and have no idea how to fix it. I've tried various other solutions

/Main.java:17: error: non-static variable this cannot be referenced from a static context ^ 1 error [duplicate]

In this simple code can anyone explain me what's wrong ? public class Main { public class UserValidator { public void validateName(String

Python docstring convention for private properties

Is it necessary to write a docstring for private properties? https://peps.python.org/pep-0008/ says that "Docstrings are not necessary for non-public methods, b

Special characters in About section on a Microsoft Teams app

I'm creating an app for Microsoft Teams from App studio. In the Developer name there is a special character. Does anyone have the same issue? I tried escape cha

How to add collation in indexes for mongodb?

I work with Mongoengine in Django, got task to sort by first_name, last_name fields ignoring case and leading whitespaces that is why add collation in queryset:

I have been trying to add a chat sdk to my project

I added the cometchat sdk to my project but each time i try to run my app i get the following errors org.gradle.api.internal.artifacts.ivyservice.DefaultLenient

Xamarin Send data via Nfc in IOS is possible?

I can't understand if is possible to create an app that simulate an Nfc card on your IOS device. (Send data to nfc reader like a Pos) In Android is possible and

Broken project in XCODE objective c

Hi, Does someone have a clue what is the reason for this broken project in xcode 13.3.1 The tab with the project settings, properties is empty!!! Check the scr

How do I set the default c# file in my Visual Studio Code c# Project?

I am new to using Visual Studio Code. I have always used Visual Studio IDE in Windows. I am trying to run a simple Hello World Program on Mac with VS Code. I ra

Algolia optionalFilters acts like filters on virtual index

I have my index and virtual index, on my index query like: { "facetFilters": [["objectID:12345", "tag:Luxury","tag:Makeup"]], // 12345 or luxury or makeup "op

Accessing browser dev tools and capturing network traffic using Watir

Have a requirement to capture network traffic from the browser while running automation test cases. Came across below post but not sure if it has been included

Discord.py bot not sending messages in a discord server but sends messages in DM's

I have a discord.py bot that when the command is sent through DM, it works. When the command is ran through a server, nothing happens. There is no errors or tra

'bytes' object has no attribute 'condition'

I am trying to stream my Rpi (zero) camera (v2.0) to HTML using cv2.VideoCapture. However, I am facing a lot of errors and I'm currently stuck on this one as th

Can't create an mysqlpump equivalent to mysqldump --all-databases

I want to create logical backups of my mysql instance. The instance contains a couple of databases and a few users. I want to backup all of them without explici

In Java how to synchronize cache read and write operations

I am working on implementing a simple cache using ArrayList in my application. I would like to synchronize cache update operations, while updating the cache I s

How do I implement rank function for nearest values for a column in dataframe?

df.head(): run_time match_datetime country league home_team away_team 0 2021-08-07

docker discord.py ffmpeg.exe was not found

My code works on windows fine I'm just stumped on how to migrate it to my docker server for stability reasons and my old vm shit the bed. bellow is my main play

dojox.grid.DataGrid sort order bug on mixed case strings?

I know Dojo is getting quite old now but we still have apps that are using it. One thing that was pointed out was the sort facility on the dojox.grid.DataGrid t

NEO 6M GPS does not respond to configuration except if commands are sent immediately after powering up gps

I am trying to configure my neo 6m GPS to stop automatic sending of information. I used Hterm serial terminal to send the proprietary messages ($PUBX,40,GLL,1,0

How to handle React props correctly

I posted this here because I am relatively new to React and didn't know what exactly should I google. In my React project, I have a kendo grid that has a custom

'bytes' object has no attribute 'condition'

I am trying to stream my Rpi (zero) camera (v2.0) to HTML using cv2.VideoCapture. However, I am facing a lot of errors and I'm currently stuck on this one as th

How can I get a variable valued current working directory (pwd) in powershell profile

I was trying to use anaconda as my Python virtual environment, and my virtual environment is stored in project directory. Manually, I need to use following comm

Why are orders in my trading algo not working? (QuantConnect algo)

I'm currently learning and trying to build my first algo which is a variation of an opening range break on the SPY. Would anyone know why my orders aren't worki

Discard audio before certain time from Hls.js stream

I am using Hls.js to live stream an audio feed into an audio element in my HTML. In my custom audio controls I limit the user to only be able to scroll back to

Why is this public address different for an ethereum signature?

I have a signature created using metamask and the personal_sign RPC method. Now I want to verify this signature in my C# backend. In order to do so I have found