object oriented programming - file input & output
TRANSCRIPT
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
File Input & Output 1Q3M1
Dudy Fathan Ali, S.Kom (DFA)2015
CEP - CCITFakultas Teknik Universitas Indonesia
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.
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.
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:
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:
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
File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of input data with FileStream and StreamWriter
Consider the following code:
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.KomFachran Nazarullah S.KomTri Agus Riyadi S.KomRiza Muhammad Nurman S.KomMusawarman S.Kom
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
File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of reading data with FileStream and StreamWriter
Consider the following code:
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 StreamReaderBuka FileReader
Data SearchData 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
File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of search data with FileStream and StreamWriter
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.KomFachran Nazarullah S.KomTri Agus Riyadi S.KomRiza Muhammad Nurman S.KomMusawarman S.Kom
File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Delimiter
o Delimiter = Pemisaho Simbol bisa digunakan untuk delimiter (#, $, &, ~)o Implementasinya menggunakan array
File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Delimiter
o Penggunaan Delimiter :o Contoh input data pelanggan:
o ID Pelanggan : 8934o Nama Pelanggan : Joni Simanjuntako Jenis Kelamin : Priao Alamat : Jakarta
8934#Joni Simanjuntak#Pria#Jakarta
8934;Joni Simanjuntak;Pria;Jakarta
Memiliki delimiter dengan simbol ‘#’
Memiliki delimiter dengan simbol ‘;’
File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Mengapa harus menggunakan delimiter?
Berikut data pelanggan---------------------------------ID Pelanggan : 8934Nama Pelanggan : Joni SimanjuntakJenis Kelamin : PriaAlamat : 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
File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of input data with delimiter format.
Consider the following code:
File Input & Output
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Process of reading data with delimiter format.
Consider the following code:
Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Thank You!Dudy Fathan Ali S.Kom