Read/ Write File/Folder

Read a file

Node JS

Buffering Contents with fs.readFile

[js]
// synchronously
var fs = require(‘fs’);

try {
var data = fs.readFileSync(‘my-file.txt’, ‘utf8’);
console.log(data);
} catch(e) {
console.log(‘Error:’, e.stack);
}
[/js]
[js]
//Unsync
var fs = require(‘fs’);
fs.readFile(‘my-file.txt’, ‘utf8’, function(err, data) {
if (err) throw err;
console.log(data);
});
[/js]

Streaming Contents

[js]
var fs = require(‘fs’);
var data = ”;
var readStream = fs.createReadStream(‘my-file.txt’, ‘utf8’);
readStream.on(‘data’, function(chunk) {
data += chunk;
}).on(‘end’, function() {
console.log(data);
});
[/js]

Others

Read line by line an upload file, write to a temporary file, delete upload file and rename the temporary file

• C#

  [c]using (StreamReader reader = new StreamReader(upLoadFilePath))
  {
  using (StreamWriter writer = new StreamWriter(tempfile))
  {
  string line = reader.ReadLine();
  while (!reader.EndOfStream)
  {
  writer.WriteLine(line);
  line = reader.ReadLine();
  }
  }
  }[/c]

  [c] System.IO.File.Delete(upLoadFilePath);
  System.IO.File.Move(tempfile, upLoadFilePath);[/c]

Read a file, delete last character

• C#

  [c] string myFileData;
  myFileData = System.IO.File.ReadAllText(upLoadFilePath);
  <pre>if (myFileData.EndsWith(" " + Environment.NewLine))
  {
  char[] charsToTrim = {‘\r’, ‘\n’, ‘ ‘};
  System.IO.File.WriteAllText(tempfile, myFileData.TrimEnd(charsToTrim));
  }[/c]

Read line by line an upload file, delete 2 first lines

• C#

  [c]
  String line = null;
  int line_number = 0;
  int lines_to_delete = 1;
  using (StreamReader reader = new StreamReader(upLoadFilePath))
  {
  using (StreamWriter writer = new StreamWriter(tempfile))
  {
  while ((line = reader.ReadLine()) != null)
  {
  // Remove first 2 header rows
  line_number++;
  if (line_number > lines_to_delete)
  break;
  }

  while ((line = reader.ReadLine()) != null)
  {
  // Remove last character "|" of row
  if (line.Substring(line.Length – 1) == "|")
  {
  line = line.Remove(line.Length – 1);
  }
  writer.WriteLine(line);
  }
  }
  }

  if (System.IO.File.Exists(tempfile))
  {
  System.IO.File.Delete(upLoadFilePath);
  System.IO.File.Move(tempfile, upLoadFilePath);
  }[/c]