Page 1 of 1

Lazarus Pascal – Retrieve Yahoo Weather Forecast

Lazarus Pascal – Retrieve Yahoo Weather Forecast
7

I like dabbling with Lazarus Pascal, a free IDE for developing Pascal programs for Windows, MacOS X and Linux, quite similar to Delphi.

One of my projects, would look great with a weather forecast, so I went an figured out how this works by accessing the Yahoo Weather API. This took me a little bit to figure out, but I’ve got it running now, even using https.
This week I decided to put it all in a small unit, so others can use it as well.

This unit only needs Synapse, which is free as well, and uses fcl-json, which comes with Lazarus.

Lazarus Pascal – Unit to Add or Remove Autorun items (Windows/MacOSX)

Lazarus Pascal – Unit to Add or Remove Autorun items (Windows/MacOSX)
0

When developing an application, sometimes it can be useful to offer the user a way to add this application to the LoginItems (Mac) or Autorun items (Windows), so that the application starts when MacOS X or Windows starts.

Since I have developed a couple applications for which this would be helpful, and as of lately even one for both platforms, I figured, why not place this in a unit so the code can be resused easily and quickly. Sharing the code would make life easier for others as well.

So here we are – feel free to post improvements – a unit that Adds, Removes and Checks if an application build with Lazarus Pascal, from the Loginitem/Autorun items.

Lazarus – How to add data to lists with AddObject

Lazarus – How to add data to lists with AddObject
0

Some components in Lazarus Pascal (and Delphi), especially the ones that have a list of strings, allow you to add additional data by linking an object to a string. The function “AddObject” is often used for this, but it’s also the most overlooked option.

With this option you can link (add) any kind of data to rows in your string list, allowing you to add additional (non visual) data.

In this short article, I’ll show you how you can work with these objects, which allow you to extend the data stored with your lists.

App Transport Security Exceptions fixed (iOS 9+, OS X 10.11+)

App Transport Security Exceptions fixed (iOS 9+, OS X 10.11+)
1

Since I’m always looking for the “best” and “easiest” way to develop applications cross platform (so far Lazarus Pascal is the winner), I decided to give Delphi 10 Seattle a try. After I recovered from a heart-attack from seeing the price, I decided to give AppMethod a try. Mind you that AppMethod is cheaper but still very expensive.

AppMethod is pretty slick (as is Delphi 10), and supports Windows (32/64 bit), Mac OS X (I’m guessing 32 bit), Android, and iOS (32 bit and 64 bit). Development is pretty easy and deployment of your app is also very easy.

The first test I did was reading a webpage (NZBGet), which worked great on all platforms, except on iOS 9, which threw a “The resource could not be loaded because the App Transport Security policy requires the use of a secure connection” exception.

I did some research on what caused this and finally found the answer and a few work-arounds – which might be practical for other development environments as well.

How to install Lazarus Pascal on Raspberry Pi 2 (Raspbian)

How to install Lazarus Pascal on Raspberry Pi 2 (Raspbian)
278

For those of you who have visited Tweaking4All more often, you might have noticed that I really like Lazarus Pascal. I use it to develop little freeware applications for multiple platforms (if possible), like for Windows, MacOS X and Linux.

So why not on a Raspberry Pi (Raspbian)? Lazarus allows Rapid Application Development in the good old Delphi style which would be ideal for a platform like the Raspberry Pi. Specially since the Raspberry Pi  2 Model B seems to be fast enough as well.

Now me and my brother-in-law (Jean-Pierre) are planning to build an Alarm system based on a Raspberry Pi 2, use a TouchScreen and plenty of sensor. Lazarus Pascal could be ideal for this purpose.

To my disappointment, it took me a lot of time to get Lazarus to run on my new Raspberry Pi 2 Model B … so that’s why I wrote this article, which is basically a compilation of a lot of steps that I found scattered all over the Internet.

Automatic MySQL backup by using Replication

Automatic MySQL backup by using Replication
11

The past few days I have been working on setting up a second QNAP NAS as a backup for my files on my primary QNAP, using realtime syncing – which works ridiculously smooth. I have some MySQL databases on my primary QNAP as well, but syncing the data doesn’t seem to be part of the plan of the backup tools provided by QNAP.

Lucky me: MySQL has a great replication mechanism build in, so you can replicate one database (master) to another (slave). The setup is easy, albeit confusing when you just start looking into this. Synchronisation is done asynchronous, meaning: changes in the data on the master will be applied to the data on the slave, but the slave doesn’t need to be permanently connected. Missed changes, when not connected, will be “saved” and when a connection is established again, will be applied.

In this article I’ll show you how to do this for two MySQL setups (QNAP), where one serves as Master (Original) and the other as Slave (Backup).

MySQL Export and Import Data: How to backup databases

MySQL Export and Import Data: How to backup databases
2

MySQL is one of the most commonly used database engines, not just because it’s free but mostly because it’s fast, reliable and widely supported. That doesn’t mean you should not make backups …

Backups of your MySQL setup can be needed for several reason. You want a backup for safe keeping, you want to move a database to another server, just before you make some major changes, or you just want to wipe your server clean and setup everything from scratch without loosing your data.

Making a one time backup of your database(s) can be a bit unclear, so in this article a description of 3 possible methods to make a backup of one or more databases and how to import them at a later time (to the same or another MySQL server).

ASCII HTML Table – DOS ASCII versus HTML Characters

ASCII HTML Table – DOS ASCII versus HTML Characters
1

I used to have a Microsoft DOS 6.0 manual laying on my desk for the sole purpose of having an ASCII reference table. I mean literally only for that purpose.

As I started dabbling in HTML, back in the day, I created a small table on the old WeetHet website for HTML codes, only to find that I every now and then run into the limitations of that table when I’m coding …

So here, for those who care for it, a table showing all 256 ASCII (DOS) characters and their HTML counter parts … including the decimal value, hexadecimal value, HTML numerical code, HTML alpha code, display as HTML character, display as DOS character, and te descriptions that go with it …

Lazarus Free Pascal – Getting started with SQLite

Lazarus Free Pascal – Getting started with SQLite
18

Lazarus, a Free Pascal based free and open source cross-platform Delphi look-a-like software development tool, has been around for a while now and has become more and more mature. I actually used with it some of my experiments (Name My TV Series for example) to develop cross-platform applications.

In this article I’ll show you how to get started with the use of SQLite in your Lazarus applications. SQLite is an open source super compact embedded SQL engine which allows you to use an SQL database with your applications without the need to actually run a full-size SQL database server.

Some knowledge of SQL, Lazarus Pascal and databases is assumed.

Delphi – IDE Code Editor Keyboard Shortcuts

Delphi – IDE Code Editor Keyboard Shortcuts
0

If you’re like me, and are switching between different developer environments on different platforms, then at times it can be hard to remember the proper keyboard shortcuts. Or … you were never aware of these shortcuts …

In this short article an overview of keyboard shortcuts for Delphi.