14.1 Introduction
Up until lesson 13 we are only creating programs that could
accept data at runtime, when a program is terminated, the data
also disappear. Is it possible to save data accepted by a VB
program into a storage device, such as a hard disk or diskette,
or even CDRW? The answer is possible. Is this chapter, we will
learn how to create files by writing them into a storage device
and then retrieve the data by reading the contents of the
files using customized VB programs.
14.2 Creating files
To create a file , use the following command
Open "fileName" For Output As #fileNumber
Each file created must have a file name and a file number for
identification. As for file name, you must also specify the
path where the file will reside.
For example
Open "c:\My ****\sample.txt" For Output As #1
will create a text file by the name of sample.txt in the My
**** folder. The accompany file number is 1. If you wish to
create and save the file in A drive, simply change the path, as
follows"
Open "A:\sample.txt" For Output As #1
If you wish to create a HTML file , simple change the
extension to .html
Open "c:\My ****\sample.html" For Output As # 2
14.2.1 Sample Program : Creating a text file
Private Sub create_****()
Dim intMsg As String
Dim StudentName As String
Open "c:\My ****\sample.txt" For Output As #1
intMsg = MsgBox("File sample.txt opened")
StudentName = InputBox("Enter the student Name")
Print #1, StudentName
intMsg = MsgBox("Writing a" & StudentName & " to sample.txt ")
Close #1
intMsg = MsgBox("File sample.txt closed")
End Sub
* The above program will create a file sample.txt in the My
****' folder and ready to receive input from users. Any
data input by users will be saved in this text file.
14.3 Reading files
To read a file created in section 14.2, you can use the input
# statement. However, we can only read the file according to
the format when it was written. You have to open the file
according to its file number and the variable that hold the
data. We also need to declare the variable using the DIM
command.
14.3.1 Sample Program: Reading file
Private Sub Reading_****()
Dim variable1 As String
Open "c:\My ****\sample.txt" For Input As #1
Input #1, variable1
Text1.Text = variable1
Close #1
End Sub
* This program will open the sample.txt file and display its
contents in the Text1 textbox.
Working with Files
ok thats good
you good in that man