Tag: address

message signing and verification for micropayment channel

Post author By Crypto Questions
Post date May 31, 2020
No Comments on 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 […]

Tags ... what am I doing wrong? Contract: pragma solidity ^0.5.0; contract Verify{ address owner ; mapping (uint256 => bool) public us, 'gas':700000, 'nonce', 'nonce': w3.eth.getTransactionCount('my address')}) signed_tx = w3.eth.account.signTransaction(transaction, 'Tokens', "invalid length"); assembly { r := mload(add(sig, "private key") txn_hash = w3.eth.sendRawTransaction(signed_tx.rawTransaction) txn_receipt = w3.eth.waitForTransactionReceipt(txn_hash) thi, (v, [ "recipient address", 32)) s := mload(add(sig, 64)) v := byte(0, 96))) } if (v < 27) { v += 27; } require(v == 27 || v == 28); return (v, address, address recipientAddress, address(this), amount)); return recoverSigner(message, 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 s, bytes memory sig) internal pure returns (address) { (uint8 v, bytes memory signature) internal view returns (bool) { bytes32 message = keccak256(abi.encodePacked(reci, bytes memory signature) public { require(!usedNonces[nonce]); usedNonces[nonce] = true ; bool done ; done =, bytes32 r, bytes32 s) { require(sig.length == 65, bytes32 s) = splitSignature(sig); return ecrecover(message, I am writing a micropayment channel for ERC20 Token, less token, mload(add(sig, private_key=private_key) signed_message transaction = mygrail.functions.withdraw(w3.eth.getTransactionCount('my address'), r, recipient, s, s); } function recoverSigner(bytes32 message, signature ); emit Success(done); } event Success(bool done); function isValidSignature(address recipient, signature) == owner ; } function splitSignature(bytes memory sig) internal pure returns (uint8 v, signature).buildTransaction({'chainId': 42, token ]) output : HexBytes('0xcc40a4139efd7fd5fe58396e60d18d181cee0a3d808749faa1682590ab2ee835') from eth_account.messages import encode_def, uint256, uint256 amount, uint256 nonce, uint256 tokens, w3.eth.getTransactionCount('my address'), Web3.toChecksumAddress("contract address")

Mastering Development

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

Post author By Full Stack
Post date May 30, 2020
No Comments on 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 […]

Tags "+85291234567". The address_text Field The fourth field of the information response of the +CMGL AT command, "20/05/30, "81084326797126204", "REC UNREAD", [address_text], [service_center_time_stamp][, 14:53:55+08" FEFF000000000000000000000000000000000000020 As described in this link +CMGL: index, address, address_text will be "Alice". The AT command +CSCS (command name in text: Select TE Character Set) can be used to specify the character set f, address_type, 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, if the text "Alice" is associated to the phone number "91234567" in the phonebook, including my Nokia 6021) leave this field empty. How can i identify the message is from Whatsapp or any other services providers names?, is a string that contains the address/phone number stored in the SMS message header. If the SMS message read is an incoming SMS message, is a string that contains the text associated to address in the phonebook. For example, message_status, sms_message_body_length]sms_message_body[+CMGL: ...] The address Field The third field of the information response of the +CMGL AT command, the address field contains the originator address. If the SMS message read is an outgoing SMS message, the address field contains the recipient address. Usually the address field value is a phone number formatted using the typical ISDN / teleph

Mastering Development Software

How can I create a database in C++?

Post author By Math Dev
Post date May 30, 2020
No Comments on 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 […]

Tags “Name Surname”); DELETE FROM CUSTOMERS WHERE NAME=”Francesco Rossi”; TRUNCATE TABLE CUSTOMERS; But that's not the point. What I've really st, address, ADDRESS TEXT, adress, age INT NOT NULL, as I can't find an easy and linear way to do what I am supposed to do. Other commands I should implement are: DROP TABLE CUSTOMERS; INSERT I, because I'm dead in the water and can't actually think about something helpful., but every time I get stuck in something, const Field& col_to_add); void addElement(char type, const S& element_to_add); string printTab(); private: vector<Field> _integer; vector<Field> _floating; vector<Fie, 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, name TEXT NOT NULL, NAME) VALUES (age, PRIMARY KEY (ID) ); I must create a table with such coloumns. I've thought about loads of different ways to do that, SALARY FLOAT, string data_name); void addElement(const T& to_add); void setName(string name); string getName() const; ~Field(); private:, while the next is the class I'm using to manage the whole thing: template class Tab { public: Tab(); ~Tab(); void

Database Development

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

Post author By Jessica Alba
Post date May 28, 2020
No Comments on 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 […]

Tags 'Advertising', 'Last Name', ['date', address, and arbitrarily long description. Each ticket has a status flag (e.g. registered, and whether it requires any change. Thanks!, but I really appreciate if someone can tell me "How good" my design is, each department might be a part higher level company division up to the CEO board (multiple levels) The personal dataforeach employee includ, each employee has a specific primary and optionally secondary role assigned. The company collects information about clients including their, I have a task to design an ER diagram and task is given as points below is the description of the problem: A telecommunicationscompanyemploy, in progress) and for closed tickets the closure summary is added. I designed an ER diagram and it is below my question is that is it a good, issue, maintenance, phone numberandemail. The company provides different types of services –online sales, sold devices and active premiumservices. Each contact with a customer is registered in dedicated service ticketincluding type of service (co, start and end dateand customer id The ticket tracks aprogress of particular case by recordingeach activity performedby theemployee using a s

CMS Mastering Development Wordpress

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

Post author By Marcia D.
Post date May 25, 2020
No Comments on 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 […]

Tags `status`, __file__, '-----BEGIN PUBLIC KEY-----\n%s\n-----END PUBLIC KEY-----' ); $key = wordwrap($public_key, 'my_ajax_handler' ); */ add_action( 'wp_ajax_my_vote_count', 'my_ajax_handler'); function my_ajax_handler() { /* check_ajax_referer('votifier_response_key'); */ $username = $_POST["username, 'my_script_enqueuer' ); function my_script_enqueuer() { wp_enqueue_script( 'my_voter_script', 'myAjax', 'VOTE\n%s\n%s\n%s\n%d\n' ); define( 'PUBLIC_KEY_FORMAT', { key: $.trim($("#field_yjr62").val()), \"" . $service_name . "\");"; wp_die(); // All ajax handlers die when finished } Console Results The console results are good, $crypted, $crypted)) { fclose($socket); return true; } } } ?> /* ===== WP_ENQUEUE SCRIPTS ==== */ /* ===== JQue, $key); $socket = @fsockopen($server_ip, $key); if (php_sapi_name() !== 'cli') { //Detect proxy and use correct IP. $address = isset($_SERVER['HTTP_X_FORWA, $port); if ($socket) { if (fwrite($socket, $service_name) { define( 'VOTE_FORMAT', $username, 1 0, 65, address, array( 'ajaxurl' => admin_url( 'admin-ajax.php' ))); } /* ===== My AJAX Handler ==== */ /* add_action( 'wp_ajax_nopriv_my_vote_count', array( 'jquery' ), but the other server is not responding. I tested the PHP code locally from my personal computer and Server B is responding. Request URL:http, data : { action: "my_vote_count", dataType: 'JSON', ip: $('input[name="item_meta[40]"]').val(), n, plugins_url('sendvote.js', port, port: $('input[name="item_meta[42]"]').val(), public_key, Q: What is the correct way to call a PHP Function with multiple parameters from the AJAX Handler? Q: Am I calling the php function correctly, SERVER_IP, service_name, service: "Votifier", success: function(data, time()); openssl_public_encrypt($data, true); $key = sprintf(PUBLIC_KEY_FORMAT, true); wp_localize_script( 'my_voter_script', url: myAjax.ajaxurl, use server name. $address = $_SERVER['SERVER_NAME']; } $data = sprintf(VOTE_FORMAT, username: $('input[name="item_meta[59]"]').val() }, xhr){ alert("Data: " + data); alert("Status: " + status); alert("xhr: " + xhr);

Mastering Development

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

Post author By Full Stack
Post date May 25, 2020
No Comments on 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 […]

Tags ..., ... Address -> id, [u].[Name], address, but I don't have success. I'm not understanding what is happening with this problem. EDIT I call the Include in context in my repository l, but I still didn't succeed. EDIT 2 I use this struture for to do this query of eager load. I tried to do another query with eager load too, Column("id")] public long UserId { get; set; } public Address Address { get; set; } } } User -> id, I have this code and relationships: namespace Tequila.Models.DTOs { public class ApplicationContext : DbContext { public App, Name, the SQL has generate is: SELECT u.id, u.password FROM user AS u WHERE u.id = @__Id_0 LIMIT 1 I've already tried many other ideas by documents official and community, user_id... When I execute this route for find a user and your address

Mastering Development

SQL OUTER JOIN statements and subqueries in SQLite [closed]

Post author By Full Stack
Post date May 24, 2020
No Comments on 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, […]

Tags `title`, 'City'], 'postcode', 'subtitle', "middlename", address, authorId, bookdescID*) book(bookdescID, bookID*) person(personID, borrowdate, dewey, DueDate, edition, EmailAddress, firstname, idcardno) publisher(publisherID, ISBN, language, lastname: '', lastname) book_copy(bookID, LibraryDB is a database system that keeps track of information concerning the books and their circulation in an imaginary library. The schem, PersonId, phoneNumber, place, publisherfullname) written_by(bookdescID*, publisherID*, returndate) author(authorID, role) published_by(bookdescID*, role) subject(subjectID, studentno, subjectID*) borrow_copy(transactionID*, subjecttype) The primary keys are underlined. The foreign keys are denoted by asterisks (*). Write an SQL query to display the titles of bo, volnumber, voltitle, Year

CMS Mastering Development Wordpress

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

Post author By Marcia D.
Post date May 23, 2020
No Comments on 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 […]

Tags { key: $.trim($("#field_yjr62").val()), $crypted, $crypted)) { fclose($socket); return true; } } return false; } ?>, $port); if ($socket) { if (fwrite($socket, $public_key); $socket = @fsockopen($server_ip, $public_key); return $public_key; } function sendVote($username, $service_name) { if (php_sapi_name() !== 'cli') { //Detect proxy and use correct IP. $address = isset($_SERVER['HTTP_X_F, $service_name); function formatPublicKey($public_key) { $public_key = wordwrap($public_key, $username, 65, address, but I've tried putting the PHP script in the root and using a full path. I am not getting any errors in the web browser console (f12). WordP, function(data, I know I should put it in the footer.) The Button Try it Localhost Version <s, ip: $('input[name="item_meta[40]"]').val(), My code is working fine on my localhost in my development environment which is outside of the WordPress press environment. I know the PHP fun, n, port, port: $('input[name="item_meta[42]"]').val(), public_key, SERVER_IP, service_name, service: "Votifier", status){ alert("Data: " + data + "\nStatus: " + status); }); }); }); My Custom PHP Script <?php const VOTE_FORMAT =, status){ alert("Data: " + data + "\nStatus: " + status); }); }); }); WordPress Version jQuery(document).read, time()); openssl_public_encrypt($data, true); $public_key = sprintf(PUBLIC_KEY_FORMAT, use server name. $address = $_SERVER['SERVER_NAME']; } $data = sprintf(VOTE_FORMAT, username: $('input[name="item_meta[59]"]').val() }

Mastering Development Software

Class diagram using UML syntax

Post author By Math Dev
Post date May 22, 2020
No Comments on 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 […]

Tags address, and Mahindra Xylo. The regular customers of the travel agency can rent any vehicle they want. The details of the customers such as the name, and phone number are maintained by the agency. I don't know how to deal with items (Tata Indica, 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 typ, Mahindra Xylo)?, Maruti van

Mastering Development

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

Post author By Full Stack
Post date May 20, 2020
No Comments on 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 […]

Tags 'CC'] def createEditor(self, 'editor', 'Option']) self.tableview.verticalHeader().hide() self.tableview.setSelectionBehavior(QtWidgets.QTableView.SelectRows), "widget", $option, 200) self.setMaximumSize(1500, 200) self.setWindowTitle('Application') def clear(self): ###clear tableview comboboxes in column 3 print("clear", address, 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, editor.currentText()) else: QtWidgets.QItemDelegate.setModelData(editor, emailItem]) @QtCore.pyqtSlot(str) def onTextChanged(self, entry in enumerate(entries): if entry.Type == "EX": user = entry.GetExchangeUser() if user is not, except that when I select the item from the QComboBox in any of the cells in column 3, i've found such things as using deleteLater() or setting the QTableView's setItemDelegateForColumn() to None and re-apply. Obviously these a, In my application im using a QTableView, index) def setModelData(self, index) def updateEditorGeometry(self, index): editor = QtWidgets.QComboBox(widget) editor.addItems(self.items) return editor def setEditorData(self, index): editor.setGeometry(option.rect) def paint(self, index): if index.column() == 2: editor.blockSignals(True) text = index.model().data(index, index): if index.column() == 2: model.setData(index, index): print("Do stuff") def fillModel(self, index): QtWidgets.QApplication.style().drawControl(QtWidgets.QStyle.CE_ItemViewItem, it doesn't populate. Does it have something to do with my setModelData() method? I also have a clear button that I would like to reset all o, model, model): """Fills model from outlook address book """ nameList = [] addressList = [] for row, painter, painter) class App(QtWidgets.QMainWindow): def __init__(self): super().__init__() self.initUI() def initUI(self):, parent=None): super().__init__(parent) self.items = ['', QStandardItemModel and a QSortFilterProxyModel in between for filtering. The content is updated via a method for columns 1 & 2, QtCore.Qt.AscendingOrder) self.proxyModel.setSortCaseSensitivity(QtCore.Qt.CaseInsensitive) self.tableview.setModel(self.prox, QtCore.Qt.EditRole) try: i = self.items.index(text) except ValueError: i = 0, QtGui, QtWidgets outApp = win32com.client.gencache.EnsureDispatch("Outlook.Application") outGAL = outApp.Session.GetGlobalAddressList() entries = o, self.delegate) self.lay.addWidget(self.button) self.lay.addWidget(self.resetbutton) self.setMinimumSize(450, text): self.proxyModel.setFilterRegExp(text) if __name__ == '__main__': import sys app = QtWidgets.QApplication(sys.argv), to