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Download Test Project Introduction A common requirement is to have applications share data with other programs. Writing articles quotes there are interfaces available to work with, for example, Microsoft Excel data files, this approach is generally complex, involves a fair amount of overhead, and requires that support libraries accompany your application.
Note that the code below is a complete rewrite of the code presented when this article was first published. I decided to make the code more robust and add a number of new features that include support for multi-line values and the ability to change the characters used for delimiters and quotes.
I also added several options to control how the CSV reader class handles empty lines. CSV files can easily be read and written by many programs, including Microsoft Excel. For the most part, reading and writing CSV files is trivial.
As the name suggestions, a CSV file is simply a plain text file that contains one or more values per line, separated by commas. Each value is a field or column in a spreadsheetand each line is a record or row in a spreadsheet.
However, there is slightly more work involved. Double quotes are used to wrap values that contain special characters such as commas, double quotes, new lines, etc. This is required to prevent those special characters from being interpreted as value delimiters, etc.
In addition, double quotes that exist within a double quoted value must appear as two double quote characters together to distinguish them from the double quote character at the end of the value.
Layout matters. Good articles start with introductions, continue with a clear structure, and end with standard appendices such as references and related articles. I honestly believe Ursula Le Guin will go down in history as one of the greatest writers, literary or otherwise, of the 20th century. Here are 10 quotes on her process as a writer. “You can only write regularly if you’re willing to write badly Accept bad writing as a way of priming the pump, a warm-up exercise that allows you to write well.” The Effortless Effort of Creativity: Jane Hirshfield on Storytelling, the Art of Concentration, and Difficulty as a Consecrating.
So this seems like a perfect task for a handy little C class. Clear ; return true; case EmptyLineBehavior. CurrLine may be set to null on return. Write columns[i] ; else Writer.
This also simplifies the code because neither class needs to worry about which mode the file is in or protect against the user switching modes.
Starting at the top of the code is the EmptyLineBehavior enum. After careful review, I realized there were a few valid ways to interpret an empty line within a CSV file. So the CsvFileReader class' constructor takes an argument of this type to specify how empty lines should be handled.
Note that this does not affect empty lines within a quoted value, or an empty line at the end of the input file. Next is my CsvFileCommon class. There are a few settings common to both the reader and writer classes and so I use this abstract base class to track the special characters within a CSV value that require the value to be enclosed in quotes.
It also provides a way to change the characters used as delimiters and quotes. The CsvFileReader class comes after that. This is the class that reads data from a CSV file and is the most complex class presented here. There are two constructors: As mentioned previously, both constructors also accept an EmptyLineBehavior argument to control how empty lines are handled.
For each value, it dispatches the appropriate parsing routine based on whether or not the first character is a quote character.Layout matters. Good articles start with introductions, continue with a clear structure, and end with standard appendices such as references and related articles.
The Purdue University Online Writing Lab serves writers from around the world and the Purdue University Writing Lab helps writers on Purdue's campus. Before you use quotes or excerpts of other works in your own writing, learn the basics of copyright law and how to seek permission to quote.
Layout matters. Good articles start with introductions, continue with a clear structure, and end with standard appendices such as references and related articles. Experience Visual Stories! Visual Stories are full-screen, tap-through, visually rich and immersive user experiences.
Explore visually appealing, highly engaging, inspiring, entertaining and informative content in a brand new, fast-loading format. “You can only write regularly if you’re willing to write badly Accept bad writing as a way of priming the pump, a warm-up exercise that allows you to write well.” The Effortless Effort of Creativity: Jane Hirshfield on Storytelling, the Art of Concentration, and Difficulty as a Consecrating.