c# qr code reader Scanning files with this method is especially helpful when looking through very large files. in Visual C#.NET

Generation QR Code in Visual C#.NET Scanning files with this method is especially helpful when looking through very large files.

Scanning files with this method is especially helpful when looking through very large files.
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Input/Output (I/O)
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The StreamWriter Class
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The StreamWriter class provides the basic functionality to read data from a Stream derived class. Table 2-24 and Table 2-25 show the most important StreamWriter properties and methods, respectively.
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Table 2-24 StreamWriter Properties
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Name AutoFlush
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Description Gets or sets an indicator that shows whether every call to the Write method should flush changes to the underlying stream. Gets the underlying stream that the reader is reading. Gets the current encoding used for the underlying stream. Gets or sets a string that contains the line terminator string. Normally used only if you need to change the string that terminates an individual line.
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StreamWriter Methods
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BaseStream Encoding NewLine
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Table 2-25
Name Close Write WriteLine
Description Closes the writer and the underlying stream Writes to the stream Writes data to the stream followed by the string that terminates an individual line
How to Write to a File
Before you can write to a file, you have to open the file for writing. This process is similar to opening a file for reading. For example, you can open a file for writing as shown here:
' VB FileStream theFile = File.Create("c:\somefile.txt") // C# FileStream theFile = File.Create(@"c:\somefile.txt");
Lesson 2: Reading and Writing Files
Unlike the code for opening a file for reading, this code actually creates a new file with a FileStream object ready to be written to. With the FileStream object in hand, you can write to the stream directly, if you want. More often, however, you will want to use a StreamWriter object to write data to the new file, as shown in this code:
' VB Dim writer As StreamWriter = New StreamWriter(theFile) writer.WriteLine("Hello") writer.Close() theFile.Close() // C# StreamWriter writer = new StreamWriter(theFile); writer.WriteLine("Hello"); writer.Close(); theFile.Close();
You can use the StreamWriter to write text directly into your new file. This pattern is much like the pattern for reading a file. Also, as demonstrated earlier for reading, the File class supports creating a StreamWriter object directly with the CreateText method:
' VB Dim writer As StreamWriter = _ File.CreateText("c:\somefile.txt") writer.WriteLine("Hello") writer.Close() // C# StreamWriter writer = File.CreateText(@"c:\somefile.txt"); writer.WriteLine("Hello"); writer.Close();
The File class also supports the WriteAllText method that writes a string to a new file, as shown here:
' VB File.WriteAllText("c:\somefile.txt", "Hello") // C# File.WriteAllText(@"c:\somefile.txt", "Hello");
This process is straightforward, but there are times when you need to write to an existing file. Writing to an existing file is similar except for how you actually open the file. To open a file for writing, you use the File class s Open method but specify that you want to write to the stream that is returned, as shown in this example:
' VB Dim theFile As FileStream
2
Input/Output (I/O)
theFile = File.Open("c:\somefile.txt", _ FileMode.Open, _ FileAccess.Write) // C# FileStream theFile = null; theFile = File.Open(@"c:\somefile.txt", FileMode.Open, FileAccess.Write);
The File class has the OpenWrite method, which is a shortcut for accomplishing this and simplifies opening existing files for writing. Instead of calling the Open method of the File class and specifying that you want to open it for writing, you can simply use code like this:
' VB theFile = File.OpenWrite("c:\somefile.txt") // C# theFile = File.OpenWrite(@"c:\somefile.txt");
These code snippets work only if the file exists. On many occasions, you will want to either open an existing file or create a new one. Unfortunately, the OpenWrite method will open only an existing file. You could write code to test for the existence of the file and create the file if it doesn t exist, but luckily, you can use the Open method of the File class to specify that you want to open or create a file, as shown here:
' VB theFile = File.Open("c:\somefile.txt", _ FileMode.OpenOrCreate, _ FileAccess.Write) // C# theFile = File.Open(@"c:\somefile.txt", FileMode.OpenOrCreate, FileAccess.Write);
The FileMode.OpenOrCreate enumeration value allows you to avoid writing procedural code to deal with the issue of whether you are dealing with a new or existing file.
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