Putting the <i class="emphasis">File</i> and <i class="emphasis">Directory</i> Classes to Work

Putting the File and Directory Classes to Work

You'll find an example showing how to use the File and Directory classes on the CD-ROM. This example is called copier, and it lets you create a directory and then copy a file to that new directory. As discussed in the In Depth section of this chapter, to use the File and Directory classes, I first import the System.IO namespace, then use the Directory class's CreateDirectory method to create a new directory, using the path the user has entered into a text box. Then I use an Open File dialog box to determine what file the user wants to copy, and use the File class's Copy method to actually copy the file:

Imports System.IO

Public Class Form1
    Inherits System.Windows.Forms.Form

    'Windows Form Designer generated code

    Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click
        Try
            Directory.CreateDirectory(TextBox1.Text)
        Catch
            MsgBox("Could not create directory.")
            Exit Sub
        End Try
        MsgBox("Directory created.")
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button2.Click
        Try
            If OpenFileDialog1.ShowDialog <> DialogResult.Cancel Then
                File.Copy(OpenFileDialog1.FileName, TextBox1.Text & "\" & _
                    OpenFileDialog1.FileName.Substring(_
                    OpenFileDialog1.FileName.LastIndexOf("\")))
            End If
        Catch
            MsgBox("Could not copy file.")
            Exit Sub
        End Try
        MsgBox("File copied.")
    End Sub
End Class

And that's all it takes—I didn't need to open the file, or even create objects of the File and Directory classes. You can see the results of this code after the files has been copied to the new directory in Figure 13.4.