VB.NET tutorial: File Stream-Sequential Access File

VB.NET File Stream

So far we haven’t talked about writing words or sentences to a hard drive or reading from it. This part will guide you through those processes. File streams can be stored in plain text and binary format. There are two types of file streams—sequential-access file and random-access file.

Sequential Access File

In sequential-access file, you can write data to the file or read data from it sequentially from the beginning of the file to the end and vice versa.

Writing to a sequential-access file

Example:
Imports System.IO 'Don’t forget to import IO package
Module Module1

    Sub Main()
        Dim SF As New SequentialFile
        SF.writingToFile("D:\sequentialfile.txt")
        'Note: In this part, we introduce error handling with try..catch..end try block
    End Sub

    Class SequentialFile
        Public Sub writingToFile(ByVal filename As String)
            'Open file for writing
            Dim fout As New FileStream(filename, FileMode.OpenOrCreate, FileAccess.Write)
            'Create StreamWriter tool
            Dim fw As New StreamWriter(fout)
            'write text to file
            fw.WriteLine("Hello World")
            'close file
            fout.Close()
            fw.Close()
        End Sub
    End Class

End Module

Reading from a sequential-access file

Example:
Imports System.IO 'Don’t forget to import IO package
Module Module1

    Sub Main()
        Dim SF As New SequentialFile

'reading from file
SF.readingFromFile("D:\sequentialfile.txt")
'Note: In this part, we introduce error handling with try..catch..end try block

    End Sub

    Class SequentialFile

Public Sub readingFromFile(ByVal filename As String)
            Dim fn As FileStream
            Dim fr As StreamReader
            Try
                 'Open file for reading
                fn = New FileStream(filename, FileMode.Open, FileAccess.Read)
                 'Create reader tool
                fr = New StreamReader(fn)
                 'Read the content of file
                Dim filecontent As String = fr.ReadToEnd
                Console.WriteLine(filecontent)
                Console.ReadLine()
            Catch e As IOException
                MsgBox(e.Message)
            End Try
            'Close file
            fr.Close()
            fn.Close()
        End Sub
    End Class

End Module

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Posted comments

Phan Neth, CICI, year 3:

Now it is ok teacher. I can connect to database and select data from it. Than you so much teacher !!!!!

04-30-2013

Dara:

Copy and paste the link below to the address box to learn how to connect C and Mysql server:
http://www.worldbestlearningcenter.com/index_files/cpp-tutorial-connect_mysql_database.htm

04-27-2013

Phan Neth, CICI, year 3:

Hello teacher i want to connect C programming language to MySql server but it have problem. When i compile it always error with library " my_global.h
and mysql.h", so how should i do?

04-27-2013

Phan Neth, Year 3 at CICI,:

I have some problem about connection to mysql server. So I hope teacher can help me. Thank !!!!

04-26-2013

Federico:

Output appears the same also this way:

static void Main(string[] args)
{
int[,] myArray = new int[5, 5];
int row, i;
int n = 1;

for (row = 0; row < 5; row++)
{
for (i = 0; i < 5; i++)
{
myArray[row, i] = n;
if (row == 1 && i == 2) Console.Write(" \t");
else Console.Write("{0} \t", n);

if (n!=26) n++;
if((i+1)%5==0) Console.WriteLine("\n");
}
}
Console.ReadLine();
}

04-13-2013

Dara:

Let pointer p point to the index 1 elem (value=2) of the array.
int *p= a+1;
Let pointer q point to the index 6 elem (value=5) of the array.
int *q= a+6;
-Expression q-p is the subtraction of address of the index 6 element and the address of index 1 elem of the array. So, the result is 5.
-Expression *p+*q is the sum of the value of index 1 elem (2) and the value of index 6 elem (5). So, the result is 7.
In conclusion, the output is 57.

03-28-2013

Anushka :

Find the output of following code
main()
{
int a[] = {1,2,9,8,6,3,5,7,8,9};
int *p= a+1; int *q= a+6;
cout<< q-p <<*p+*q; }

03-28-2013

Dara:

Option Explicit
Dim Cn as New ADODB.Connection
Private Sub_Form_Load()
Cn.Open "Provider=SQLOLEDB; Data Source=ServerName; Initial Catalog=DatabaseName;UserID=UserName; Password=Passw"
End Sub
You will need to replace ServerName with the name of your server (installed SQL Server), DatabaseName withe the name of your data file that you want to connect to, UserName with the name of the user to login to SQL Server, and Passw with the password used to login to SQL Server.

03-13-2013

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VB.NET tutorial: File Stream-Sequential Access File

VB.NET File Stream

Sequential Access File

VB.NET programming tutorial

Posted comments