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ZXing ("Zebra Crossing") barcode scanning library for Java , Android - zxing / zxing . ... The Barcode Scanner app can no longer be published, so it's unlikely any changes will be accepted for it. ... QR code is trademarked by Denso Wave, inc.

The String.Split method breaks a string into multiple strings based on separator characters. You tell it which characters to treat as separators by passing a char array. Example 7-8 splits on spaces, commas, and periods.

string[] items = inputString.Split( new char[] { ' ', ',', '.' }, StringSplitOptions.RemoveEmptyEntries);

While inside the mysql terminal as the toymaster user, issue the following command: SHOW DATABASES; As illustrated in Figure 12-3, this will display the available databases in your running MySQL server.

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20 Jun 2017 ... Learn how to read QR code images in Java using google's zxing library.

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2 Answers. I don't know what qualifies as best but zxing has a qr code generator for java , is actively developed, and is liberally licensed. QRGen is a good library that creates a layer on top of ZXing and makes QR Code generation in Java a piece of cake.

If inputString contained "One,Two Three, Four. Five.", this would put a five-element array into items containing the strings "One", "Two", "Three", "Four", and "Five". Example 7-8 asks Split to ignore empty items so that when we get both a period and a space in succession we don t get an empty string in the results to represent the fact that there were two separators. If you don t need to skip such things, there s a simpler overload of Split that illustrates yet another way to initialize an array:

string[] items = inputString.Split(' ', ',', '.');

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Figure 12-3. A list of currently available databases This is useful when you want to know what databases are already occupying your MySQL data directory to manage server space. In Figure 12-3, we can see the databases available in the data directory. The first is information_schema; this database contains the internal workings of MySQL. You do not have to worry about it because most of the time we will let MySQL manage it. The second is mysql, which contains information about privileges for tables and users. The third is test, a dummy database available for practice. Finally, you can see the toys database you made earlier. Exit from the MySQL prompt after viewing the contents by typing \q and pressing Enter.

It looks like we ve passed three char arguments to this method. But there s no such overload of Split this ends up calling an overload that looks like this:

public string[] Split(params char[] separator) ...

That params keyword is significant. When an argument is marked with this keyword, C# lets you use syntax that makes it look like a series of individual arguments, and it will create an array from these for you. (You re free to provide the array explicitly if you prefer.) The params keyword can be used on only the very last argument of a method, to avoid potential ambiguity about which values go into arrays and which become arguments in their own right. That s why Example 7-8 had to create the array explicitly. The examples so far contain nothing but strings. This is a poor way to represent events in a calendar it would be useful to know when each event occurs. We could add a second array of type DateTimeOffset[] whose elements correspond to the event names in the original array. But spreading related data across multiple arrays can make code awkward to write and hard to maintain. Fortunately, there s a better way.

One of the major duties of database administrators is to back up database data regularly. In order to create a backup, you need to use the utility mysqldump, which has the following syntax:

You can create an array using any type for the element type you re not limited to types provided by the .NET Framework class library. You can use a class defined in the way shown in 3, such as the calendar event type in Example 7-9.

class CalendarEvent { public string Title { get; set; }

}

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