In previous posts we discussed about casting using the ‘as’ operator instead of using the ‘classic way’ of casting (more info here). But there are a few things we need be careful when using ‘as’ and ‘is’ operators.
Let’s assume that you wish to call a method that has a return value and also accepts an out variable, but you do not wish to use the contents of the out variable that will be returned.
So far we were creating a dummy variable that will later not be used, or discarded.
With C# 7 you can now use Discards
Last year I upgraded from Boyfriend 5.0 to Husband 1.0 and noticed that the new program began making unexpected changes to the accounting software; severely limiting access to wardrobe, flower and jewelry applications that operated flawlessly under Boyfriend 5.0. No mention of this phenomenon was included in the product brochure. In addition, Husband 1.0 un-installs many other valuable programs such as Dinner Dancing 7.5, Cruise Ship 2.3, and Opera Night 6.1. It also installs new, undesirable programs such as Poker Night 1.3, Saturday Football 5.0, Golf 2.4 and Clutter Everywhere 4.5. Conversation 8.0 no longer runs. When I click on it, the system crashes. Under no circumstances will it run Diaper Changing 14.1 or House Cleaning 2.6.
I’ve tried running Nagging 5.3 to fix Husband 1.0, but this all purpose utility is of limited effectiveness. Can you help, please!!!!
There are quite a few ways to connect the Raspberry Pi with a GPS receiver:
- Using a bluetooth GPS and the bluetooth dongle we already setup
- Using a GPSHat from Adafruit (or something similar)
- Using a USB GPS and permanently occupy one of your USB ports.
Our next stop will be to setup bluetooth for our Pi. We will need bluetooth for many bluetooth enabled services. We will discuss in future posts what we will do with bluetooth. For now assume we need it 🙂
If you are using RPi 2 you are going to need a bluetooth dongle. I used the following but in no way I am endorsing or selling it. Just pointing out what I used and how it might help, since I have heard many cases in which people bought bluetooth dongles that did not work with Raspberry Pi.
In this part of the tutorial we will focus on how to give your Raspberry Pi a static IP address in your network. We set up remote access to our Pi, now we will set up a static IP address so whenever we turn it on and it connects to our network it will always obtain the same IP address so we will always know what IP we want to connect to via remote desktop.
CustomObject a = new CustomObject(); object b = (object)a;
Okay I am using an overly trivial example here but I think you get the point.
Now imagine the following example. We are given an enumerable form of data through the network, in JSON format let’s say, We are aware that this enumerable has different forms of data, some are objects, some are strings, some are ints etc. Bear with me here, I know this is a crazy scenario which has no meaning but let’s suspend our disbelief for a moment and go through with it. So let’s say we have the following Enumerable
Well implicit type casting is a feature of C# that helps you convert instances of custom Classes you created from one to another.
So we continue with our basic setup for our Raspberry Pi. We need to add ability to connect to Wifi networks and in order to not occupy a screen every time we want to work on our Pi we will also setup a way to have a remote connection on our Pi.
If you are using Raspberry Pi one or two then you will need a Wifi Dongle for this. The one I bought and works out of the box is this one. It’s cheap, works out of the box, but it’s from china. So depending on your location it might take some time to arrive, so chose what you please 🙂
Since our Raspberry Pi is now operational let’s move on to the next part. In this part of the tutorial we will setup our Pi to always boot to the Linux GUI (boot to desktop) and expand our Operating System to utilize the full storage of the SD card we are using.
Continue reading RPi Car Computer Part 2: Boot to Desktop, Expand root and Change Password