1. Ch 10 Sequential Access Files

2. Files Text files Reading a file Writing to a file Input files
Output files
Sequential access files

3. Creating a Stream for Output
Declare a StreamWrite Variable
Dim outFile As IO.StreamWriter

4. Opening a File for Output
Opening a sequential access file
IO.File.CreateText opens a file for output
IO.File.AppendText opens a file for append
Examples
outFile = IO.File.CreateText(“F:\\VB2015\Chap10\employee.txt”)
outFile = IO.File.AppendText(“report.txt”)

5. Writing Data to a File

6. Creating a Stream for Input
‘ declare a StreamReader variable Dim inFile As IO.StreamReader

7. Opening a File for Input
‘ Open a sequential access file inFile = IO.File.OpenText(“report.txt”)

8. Checking the Existence of the Input File
‘ determine whether the report.txt file exists ‘ in the current project folder If IO.File.Exists(“report.txt”) Then inFile = IO.File.OpenText(“report.txt”) Else MessageBox(“Can’t fine the report.txt file”, _ “Output”, MessageBoxButtons.OK, _ MessageBoxIcon.Information) End IF

9. Reading Data From a File
‘ read a line of text
message = inFile.ReadLine
‘ read data from a file line by line
Do Until inFile.Peek = -1
line = inFile.ReadLine
MessageBox.Show(line)
Loop

10. Contestant names appear in the Contestants box
An Example
Contestant names appear in the Contestants box

11. Names contained in the contestants.txt file
Data in the File
Names contained in the contestants.txt file

12. An Example (Cont.)

13. An Example (Cont.)