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Cryptocurrency Ethereum Mastering Development

message signing and verification for micropayment channel

I am writing a micropayment channel for ERC20 Token, but I have pasted here a small signature verification code which is not working. The transaction doesn’t succeeds. I have to use web3py to send signed messages to verification to the contract.. Here is the piece of code to sign message and then sign transaction. signature […]

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Mastering Development

Receiving OTP SMS Via AT+CMGL Command (e.g. Whatsapp)

I’m new to GSM AT Commands and I’m using ZTE MF190S USB 3G USB Modem with Modem Nodejs Module also tried with MS Hyperterminal. The problem i’m facing that when i receive SMS using AT+CMGL=”ALL” from Whatsapp (as example) i got in sender number field 81084326797126204 witch invalid phone number and should be “Whatsapp” instead […]

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Mastering Development Software

How can I create a database in C++?

I’ve been given a homework at university that basically asks to create something similar to SQL using only C++ language. (I’ve never used SQL so I don’t even know how it works) It means that if the user writes something like CREATE TABLE CUSTOMERS ( ID INT NOT NULL AUTO_INCREMENT, NAME TEXT NOT NULL, AGE […]

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Database Development

Database ER diagram review. Is this a good database design?

I have a task to design an ER diagram and task is given as points below is the description of the problem: A telecommunicationscompanyemploys thousands of consultants. Each consultant is assigned to company department, each department might be a part higher level company division up to the CEO board (multiple levels) The personal dataforeach employee […]

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CMS Mastering Development Wordpress

What is the correct way to call a PHP Function with multiple parameters from the AJAX Handler?

Q: What is the correct way to call a PHP Function with multiple parameters from the AJAX Handler? Q: Am I calling the php function correctly? Page Element The user clicks a button. Action: The click should connect to an external server using the following params: User Name 2. IP Address 3. Port 4. Public […]

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Mastering Development

Entity Framework 6.4 + PostgreSQL Relationship One-to-One Unilateral don’t include entity [duplicate]

I have this code and relationships: namespace Tequila.Models.DTOs { public class ApplicationContext : DbContext { public ApplicationContext(DbContextOptions options) : base(options) { } public DbSet<Address> Address { get; set; } public DbSet<User> User { get; set; } } [Table(“address”)] public class Address { [Column(“id”)] public long AddressId { get; set; } [Column(“user_id”)] [ForeignKey(“User”)] public long UserId […]

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Mastering Development

SQL OUTER JOIN statements and subqueries in SQLite [closed]

LibraryDB is a database system that keeps track of information concerning the books and their circulation in an imaginary library. The schema for the LibraryDB database is given below: borrow(transactionID, personID*, borrowdate, duedate, returndate) author(authorID, firstname, middlename, lastname) book_copy(bookID, bookdescID*) book(bookdescID, title, subtitle, edition, voltitle, volnumber, language, place, year, isbn, dewey, subjectID*) borrow_copy(transactionID*, bookID*) person(personID, […]

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CMS Mastering Development Wordpress

JQuery calling a Custom PHP function (Works in Dev but not in WordPress)

My code is working fine on my localhost in my development environment which is outside of the WordPress press environment. I know the PHP function is working. I am able to send test votes to my server from my localhost on my PC. Problem: I cannot get this to work in WordPress. My Thoughts I […]

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Mastering Development Software

Class diagram using UML syntax

Draw a class diagram using the UML syntax to represent the fact that the fleet of vehicles at a travel agency consists of vehicles of the types Tata Indica, Maruti van, and Mahindra Xylo. The regular customers of the travel agency can rent any vehicle they want. The details of the customers such as the […]

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Mastering Development

Using QComboBox in QTableView properly – issues with data being set and clearing QComboBoxes

In my application im using a QTableView, QStandardItemModel and a QSortFilterProxyModel in between for filtering. The content is updated via a method for columns 1 & 2, and I want there to be a 3rd column for user to select options. I would prefer to use a QComboBox. I’ve got everything pretty much working, except […]