File Input & Output

Directories
In order to handle Directories, we have to first import the
System.IO et System.Text libraries.

Exists
A Boolean that returns TRUE if the Folder/File Specified in the path string is found , else FALSE.

Code:

string path_str = @"C:\Sleeper\";
if(!Directory.Exists(path_str))
...
string path_str = path_str +"config.cfg";
if(!File.Exists(path_str))
...


System.IO.StreamReader
Used to explore streams that aren't files.

Constructor(path)
Constructs a Read line stream from the file in the specified path (default UTF .

Fields
bool EndOfStream , returns true if the stream was read entirely.

Methods

Close
Closes the stream and liberates the resources allocated for the stream, MUST DO after finishing.

Peek
Returns the next character in the stream without consuming a Read

Read
Consumes one character. //Conversion from int to char needed.

Read(CharTab, index,length)
Reads length charrs from index and stores them in CharTab // Conversion needed (char)

ReadLine
Returns the next line in the stream or null if it's it's end.

ReadToEnd

Code:

1. using System;
2. using System.IO;
3.
4. namespace Chap3 {
5. class Program {
6. static void Main(string[] args) {
7. // répertoire d'exécution
8. Console.WriteLine("Répertoire d'exécution : "+Environment.CurrentDirectory);
9. string ligne = null;
10. StreamReader fluxInfos = null;
11. // lecture contenu du fichier infos.txt
12. try {
13. // lecture 1
14. Console.WriteLine("Lecture 1----------------");
15. using (fluxInfos = new StreamReader("infos.txt")) {
16. ligne = fluxInfos.ReadLine();
17. while (ligne != null) {
18. Console.WriteLine(ligne);
19. ligne = fluxInfos.ReadLine();
20. }
21. }
22. // lecture 2
23. Console.WriteLine("Lecture 2----------------");
24. using (fluxInfos = new StreamReader("infos.txt")) {
25. Console.WriteLine(fluxInfos.ReadToEnd());
26. }
27. } catch (Exception e) {
28. Console.WriteLine("L'erreur suivante s'est produite : " + e.Message);
29. }
30. }
31. }
32. }

System.IO.StreamWriter

Constructor(pathToFile)

Fields
virtual boolean : AutoFlush
Writing mode in the file : False = the writing n the stream is not imediate, there is first writing on a temporary memory then on the file.
Use TRUE ON network.

METHODS

Close
Must be used or file will be unusable.

Flush
Quick write ?

WriteLine
Self Defined.