File Input & Output

1. Q3M1 – OOP C# Dudy Fathan Ali S.Kom
File Input & Output 1
Q3M1
Dudy Fathan Ali, S.Kom (DFA)
2015
CEP - CCIT
Fakultas Teknik Universitas Indonesia

2. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
o The stream is a sequence of bytes travelling from a source to a
destination over a communication path.
o The two basic streams used are the input and output streams.
o Input stream is used for a read operation.
o Output stream is used for performing a write operation.
o The System.IO namespace includes various classes, which are
used to perform operations, such as file creation, file deletion,
and the read-write operations to files.

3. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Common Class of System.IO Namespace
The following table describes some commonly used classes in the System.IO namespace.

4. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
FileStream Class
Most file Input/Output (I/O) support in the .NET Framework is implemented in
the System.IO namespace. You can use the FileStream class in the
System.IO namespace to read from, to write, and to close files.
FileStream [ObjName] = new FileStream([FileName],
[FileMode], [FileAccess])
Code Structure:
FileStream fs = new FileStream(“MyFile.txt”,
FileMode.Open, FileAccess.Read);
Example:

5. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
StreamReader and StreamWriter Class
The Stream class is used to read from and to write data in the text files. If data
of a file is only text, then you can use the StreamReader class and the
StreamWriter class to accomplish the reading and writing tasks
StreamReader sr = new StreamReader([ObjFileStream])
Code Structure:
FileStream fs = new FileStream(“MyFile.txt”,
FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fs);
Example:

6. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of input data with FileStream and StreamWriter
File
Input.txt
FileStream StreamWriter
Write Data to
Stream
Mengosongkan
memori
Pembacaan data bisa
dari input user atau
dari cara yang lain
Data di simpan ke
dalam file Input.txt
Buka
StreamWriter
Buka
FileStream
Read Data
From User
Close SW &
FS
Tutup
StreamWriter dan
FileStream
Flush

7. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of input data with FileStream and StreamWriter
Consider the following code:

8. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Latihan Mandiri
Diketahui nama dosen sebagai berikut :
Masukkan lah nama-nama tersebut kedalam satu file dengan nama datadosen.txt
dengan menggunakan FileStream.
Catatan:
Nama dosen harus dimasukkan berdasarkan inputan user (bukan nilai statis dari
variable)
Dudy Fathan Ali S.Kom
Fachran Nazarullah S.Kom
Tri Agus Riyadi S.Kom
Riza Muhammad Nurman S.Kom
Musawarman S.Kom

9. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of reading data with FileStream and StreamReader
File
Output.txt
FileStream
Tampilkan
Data
Next Data
Y
N
Close SR
Close FS
Tutup
StreamReader
Tutup
FileStream
(b) Buka
StreamReader
(a) Buka
FileStream
(a)  Membuka File
(b)  Memuat Isi File ke dalam object
sr !=
null
StreamReader

10. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of reading data with FileStream and StreamWriter
Consider the following code:

11. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of search data with FileStream and StreamReader
File
Output.txt
FileStream StreamReader
sr !=
null
Y
N
Close SR
Close FS
Tutup
StreamReader
Tutup
FileStream
Buka StreamReader
Buka
FileReader
Data Search
Data yang di
cari
Variabel dataUntuk menampung
hasil pencarian data
Hasil cari
simpan ke
variabel data
Y
a
Cetak data
Apakah text yang di cari ada,
Jika iya maka akan di simpan
ke variabel data
Untuk pengecekan, anda bisa
menggunakan Contains
aNext Data
Y

12. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of search data with FileStream and StreamWriter

13. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Latihan Mandiri
Anda ditugaskan untuk mencari nama lengkap dari orang yang bernama “Fachran”
dari file datadosen.txt yang berisi data sebagai berikut :
Tampilkan data yang dicari sehingga menghasilkan output sebagai berikut :
Catatan :
Parameter pencarian harus dari inputan user (bukan nilai statis dari variable)
Data yang dicari : Fachran Nazarullah S.Kom
Dudy Fathan Ali S.Kom
Fachran Nazarullah S.Kom
Tri Agus Riyadi S.Kom
Riza Muhammad Nurman S.Kom
Musawarman S.Kom

14. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Delimiter
o Delimiter = Pemisah
o Simbol bisa digunakan untuk delimiter (#, $, &, ~)
o Implementasinya menggunakan array

15. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Delimiter
o Penggunaan Delimiter :
o Contoh input data pelanggan:
o ID Pelanggan : 8934
o Nama Pelanggan : Joni Simanjuntak
o Jenis Kelamin : Pria
o Alamat : Jakarta
8934#Joni Simanjuntak#Pria#Jakarta
8934;Joni Simanjuntak;Pria;Jakarta
Memiliki delimiter
dengan simbol ‘#’
Memiliki delimiter
dengan simbol ‘;’

16. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Mengapa harus menggunakan delimiter?
Berikut data pelanggan
---------------------------------
ID Pelanggan : 8934
Nama Pelanggan : Joni Simanjuntak
Jenis Kelamin : Pria
Alamat : Jakarta
Terkadang developer membutuhkan tampilan seperti ini:
Dengan menggunakan
delimiter, developer dapat
lebih mudah memecah data
yang satu dengan yang lain.
8934#Joni Simanjuntak#Pria#Jakarta
array[0] = 8394 array[1] = Joni
Simanjuntak
array[2] = Pria array[3] =
Jakarta

17. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of input data with delimiter format.
Consider the following code:

18. File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of reading data with delimiter format.
Consider the following code:

19. Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Thank You!
Dudy Fathan Ali S.Kom
dudy.fathan@eng.ui.ac.id