In this tutorial, we will going to make a program that has a text file database which will be going to use as our database of the program.
Now, let's start this tutorial!
1.Let's start this tutorial by following the following steps in Microsoft Visual Basic 6.0: Open
Microsoft Visual Basic 6.0, click
Choose Standard EXE, and click
Open.
2.Next, add only one Button named
cmdOK and labeled it as "OK". Add two textbox named
txtUser for inputting the username and
txtPass for inputting the password.You must design your interface like this:
3. Open a notepad and on it type:
"admin","admin"
"user","user"
Save it as
Security.txt.
4.Now put this code for your code module. This code is for cmdOK_Click:
Private Sub cmdOk_Click()
Open "Security.txt" For Input As #1
Do Until EOF(1)
Input #1, user, pass
If txtUser.Text = user And txtPass.Text = pass Then
MsgBox "W E L C O M E", vbInformation
Exit Sub
End If
Loop
MsgBox "A C C E S S D E N I E D", vbInformation
Close #1
End Sub
Explanation:
We have created a syntax for opening our text file named Security.txt and as For Input As #1. The
Open Statement here enables input/output (I/O) to a file. The Open statement syntax has these parts:
Pathname - string expression that specifies a file name — may include directory or folder, and drive,
Mode - keyword specifying the file mode: Append, Binary, Input, Output, or Random. If unspecified, the file is opened for Random access,
Access - keyword specifying the operations permitted on the open file: Read, Write, or Read Write. The
#1 here in the code means reading of the text file. The we have created an EOF Do Until Loop.
EOF returns a value that indicates whether the current record position is after the last record in a Recordset object. Then we make variables user and pass as our input that is equal to the content of the text file to be read. And if it is equal txtUser and txtPass respectively, then it will prompt the user to "
Welcome". Otherwise, it will diplay "
Access Denied". The
close statement here closes the text file at the end of a request and releases resources.
Output:
Download the source code and try it! :)
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