Recently, I have been working on a mobile app SDK for a client, both in Android and iOS. The Android SDK is packaged as an AAR while the iOS is packaged as a Swift framework. The SDK uses Google Analytics. The problem arose when using the Google Analytics iOS SDK – it works fine when …
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Had a chat recently with a colleague and the topic of Software Development Lifecycle (SDLC) came up. Whenever I talk about concepts or technical stuff with other people, I typically try to explain it in a way that is easy to understand for a non-technical person. It is a way of challenging myself cos if …
Was trying to show an alert dialog in a project’s AppDelegate.swift and ViewController.swift and decided to move it to a function in a separate utility class. Main issue was how to make it work as the class was a plain Swift class – self.present() could be used inside ViewController, self.window?.rootViewController?.present() could be used inside AppDelegate, …
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Imagine going into a restaurant. You see a nice decor, with tables laid out in an orderly fashion, pretty tablecloth, walls sprinkled with beautiful artwork, ambient lighting, etc. You pick up the nicely done up menu with attractive photos, juicy titles, succulent descriptions and a myriad of options for each dish. Hidden from your view …
References: Is there a way to print out the type of a variable/pointer in C? Why are C character literals ints instead of chars? Was trying to find out the type of char/string literals in C. Found a hackish way of doing it. Source code: test.c #include <stdio.h> int main() { char *s = “ABC”; …
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Just a simple program to see the effects of pointer initialization in C. Program: #include void main() { int *p; printf(“&p = %p, p = %p\n”, &p, p); /* // This will cause segmentation fault *p = 5; printf(“*p = %d\n”, *p); */ int *q = 0; printf(“&q = %p, q = %p\n”, &q, q); …
This post only documents a simple program to show the effects of * and & in C and does not attempt to explain what pointers are. For a quick read, check out The 5-Minute Guide to C Pointers. Program: #include <stdio.h> int main() { // lval (left-hand side value – write) = rval (right-hand side …
The following query will list the top 5 tables by table size in MySQL. SELECT TABLE_SCHEMA, TABLE_NAME, CEIL((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024) AS table_size_in_MiB, TABLE_ROWS AS estimated_row_count, AVG_ROW_LENGTH FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN (‘information_schema’, ‘innodb’, ‘mysql’, ‘performance_schema’, ‘phpmyadmin’, ‘sys’, ‘tmp’) ORDER BY table_size_in_MiB DESC LIMIT 5; Note that TABLE_ROWS is only accurate …
For more information on the ESC/POS command set which receipt printers use for printing, see What is ESC/POS and How Do I Use It by Michael Billington, also the author of the excellent escpos-php PHP library for receipt printers. Thanks to this StackOverflow post as well: printing QR codes through an ESC/POS thermal printer? 🙂 …
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For more information on the ESC/POS command set which receipt printers use for printing, see What is ESC/POS and How Do I Use It by Michael Billington, also the author of the excellent escpos-php PHP library for receipt printers. Steps to run: Save the code below as NetworkReceiptPrinter.java – change printer IP accordingly. Run javac …
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