Serg ReDetection

Useful resources that were used to build the memory graph application. This is also a set of interesting materials which are related to memory understanding.

Source code

The Memory Graph Project builds the memory graph of the application
Python implementation of searching object's references and other interesting features via (lldb) script import lldb.macosx.heap
C++ implementation of searching object's references
FLEX set of in-app debugging and exploration tools for iOS development

Materials and media

WWDC 2018 session iOS Memory Deep Dive

Now that you can finally™ submit iPhone X screenshots of your apps to iTunes Connect, here's an easy Terminal command to take a proper screenshot:

xcrun simctl io booted screenshot "~/Desktop/Simulator Screen Shot - iPhone X - $(date +'%Y-%m-%d at %H.%M.%S').png"

This will use Xcode's built-in Simulator command line utility to save a full-frame screenshot of the iPhone X simulator (assuming it's the only one running), without cutting of the notch and rounded corners like cmd+s does. Name is formatted the same as cmd+s would do it and it's also saved to desktop.

Important thing to note: if Debug -> Optimize Rendering for Window Scale is on, screenshot might be saved at wrong resolution, so either turn that off or make sure it's at 100% scale before taking the screenshot (not "Actual Size", but 100%).

Editors

resources

Exposing your clipboard over SSH

I frequently administer remote servers over SSH, and need to copy data to my clipboard. If the text I want to copy all fits on one screen, then I simply select it with my mouse and press CMD-C, which asks relies on m y terminal emulator (xterm2) to throw it to the clipboard.

This isn't practical for larger texts, like when I want to copy the whole contents of a file.

If I had been editing large-file.txt locally, I could easily copy its contents by using the pbcopy command:

	// MIT License
	//
	// Copyright (c) 2017 Dariusz Rybicki Darrarski
	//
	// Permission is hereby granted, free of charge, to any person obtaining a copy
	// of this software and associated documentation files (the "Software"), to deal
	// in the Software without restriction, including without limitation the rights
	// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	// copies of the Software, and to permit persons to whom the Software is
	// furnished to do so, subject to the following conditions:

	# Defaults / Configuration options for homebridge
	# The following settings tells homebridge where to find the config.json file and where to persist the data (i.e. pairing and others)
	HOMEBRIDGE_OPTS=-U /var/lib/homebridge

	# If you uncomment the following line, homebridge will log more
	# You can display this via systemd's journalctl: journalctl -f -u homebridge
	# DEBUG=*

	#import <Foundation/Foundation.h>

	// VARIABLE must be a variable declaration (NSString *foo)
	// VALUE is what you are checking is not nil
	// WHERE is an additional BOOL condition

	#define iflet(VARIABLE, VALUE) \
	ifletwhere(VARIABLE, VALUE, YES)

	#define ifletwhere(VARIABLE, VALUE, WHERE) \

	if [ ${CONFIGURATION} == "AppStore" ]; then
	buildNumber=$(git rev-list HEAD \| wc -l \| tr -d ' ')
	/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "${PROJECT_DIR}/AppName/AppName-Info.plist"
	/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "${PROJECT_DIR}/AppName WatchKit App/Info.plist"
	/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "${PROJECT_DIR}/AppName WatchKit Extension/Info.plist"
	fi;

	if [ ${CONFIGURATION} == "Release" ]; then
	buildNumber=$(git rev-list HEAD \| wc -l \| tr -d ' ')
	/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "${PROJECT_DIR}/AppName/AppName-Info.plist"

	func standardDeviation(arr : [Double]) -> Double
	{
	let length = Double(arr.count)
	let avg = arr.reduce(0, {$0 + $1}) / length
	let sumOfSquaredAvgDiff = arr.map { pow($0 - avg, 2.0)}.reduce(0, {$0 + $1})
	return sqrt(sumOfSquaredAvgDiff / length)
	}

	let responseTimes = [ 18.0, 21.0, 41.0, 42.0, 48.0, 50.0, 55.0, 90.0 ]

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>items</key>
	<array>
	<dict>
	<key>assets</key>
	<array>
	<dict>