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It is possible to save data accepted by a VB program into a storage device, such as a diskette or hard disk, or even CDRW? The answer is possible.In this chapter, we will learn how to create files by writing them into a storage device and then by reading the contents of the files how to retrieve the data using customized VB programs.
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Creating files
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To create a file , use the following command
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Open "fileName" For Output As #fileNumber
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Each file created must have a file number and a file name for identification and as for file name, you must also specify the path where the file will reside.
For example
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Open "c:\My Documents\sample.txt" For Output As #1
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will create a text file by the name of sample.txt in the My Document folder and the accompany file number is 1. If you wish to save and create the file in A drive, simply change the path, as follows"
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Open "A:\sample.txt" For Output As #1
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If you wish to create a HTML file , simple change the extension to .html as follows:
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Open "c:\My Documents\sample.html" For Output As # 2
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The following program creates a text file:
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Private Sub create_Click()
Dim intMsg As String
Dim StudentName As String
Open "c:\My Documents\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
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The above program will create a file sample.txt in the My Documents' folder and ready to receive input from users and any data input by users will be saved in this text file.
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Reading files
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To read a file created in previous example, you can use the input # statement and we can only read the file according to the format when it was written. You have to open the file according to the variable that hold the data and its file number.
We also need to declare the variable using the DIM command only.
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The following example is used to read a text file:
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Private Sub Reading_Click()
Dim variable1 As String
Open "c:\My Documents\sample.txt" For Input As #1
Input #1, variable1
Text1.Text = variable1
Close #1
End Sub
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This program will open the sample.txt file and display its contents in the Text1 textbox itself.
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