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How To Create Image Converter Program In Visual Studio


How To Create Image Converter Program In Visual Studio



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Hello friends, in this post I will discuss about how to change the image format in a form using in VB.Net language in Visual Studio 2010. Image Converter is a program that can convert an image format from one extension to another, for example from .JPG to .PNG, .PNG to .BMP and so on, so we don't need to open an image processing application to do it.

Okay, first open Visual Studio and create a new project, then design the form more or less like the picture below


NOTES :

Required Components in Form:
  • 3 Textbox
  • 3 Button
  • 1 ComboBox
  • 1 PictureBox
  • 4 Label
When done, go into code and declare some global variables

Public Class Form1

    Dim SourceFilePath As String = ""
    Dim DestinationFilePath As String = ""
    Dim imgFormat As Imaging.ImageFormat   

End Class

Then, enter the following code into the Form_Load to fill the ComboBox

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load   
     cmbImageFormat.Items.Add("Select")
     cmbImageFormat.Items.Add("Bmp")
     cmbImageFormat.Items.Add("Jpeg")
     cmbImageFormat.Items.Add("Png")
     cmbImageFormat.Items.Add("Gif")
     cmbImageFormat.SelectedIndex = 0
End Sub

Then, double-click Button 1 and enter the following code to select the image you want to convert

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click   
     Dim FileDlg As New OpenFileDialog
     If FileDlg.ShowDialog = Windows.Forms.DialogResult.OK Then
         SourceFilePath = FileDlg.FileName
         TextBox1.Text = SourceFilePath
         PictureBox1.Image = Image.FromFile(SourceFilePath)
     End If
End Sub


Then, double-click Button 2 and enter the following code to determine where to save the converted image

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click   
     Dim folderDlg As New FolderBrowserDialog
     If folderDlg.ShowDialog = Windows.Forms.DialogResult.OK Then
         DestinationFilePath = folderDlg.SelectedPath
         TextBox2.Text = DestinationFilePath
     End If
End Sub





and finally, double-click Button 3 and enter the following code to process the image format as well as save to the specified location

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click   
     If SourceFilePath.Trim = "" Then
         MessageBox.Show("Please enter source file path")
         Return
     ElseIf DestinationFilePath.Trim = "" Then
         MessageBox.Show("Please enter destination file path")
         Return
     ElseIf TextBox3.Text.Trim = "" Then
         MessageBox.Show("Please enter file name")
         Return
     ElseIf cmbImageFormat.SelectedIndex = 0 Then
         MessageBox.Show("Please select image format")
         Return
     Else
         Dim LocatioFile As String = DestinationFilePath & "\" & TextBox3.Text
         Dim strformat As String = cmbImageFormat.Text
         Select Case strformat
             Case "Bmp"
                 imgFormat = Imaging.ImageFormat.Bmp
                 LocatioFile = LocatioFile & ".bmp"
             Case "Jpeg"
                 imgFormat = Imaging.ImageFormat.Jpeg
                 LocatioFile = LocatioFile & ".jpeg"
             Case "Png"
                 imgFormat = Imaging.ImageFormat.Png
                 LocatioFile = LocatioFile & ".png"
             Case "Gif"
                 imgFormat = Imaging.ImageFormat.Gif
                 LocatioFile = LocatioFile & ".gif"
         End Select
         Dim SourceImg As Image
         SourceImg = Image.FromFile(SourceFilePath)
         SourceImg.Save(LocatioFile, imgFormat)
         MessageBox.Show("Convert image successfully")
         PictureBox1.Image = Nothing
         TextBox1.Clear()
         TextBox2.Clear()
         TextBox3.Clear()
         cmbImageFormat.SelectedIndex = 0
     End If
End Sub

When finished and there is no error, the program is ready to run.

For more details, please watch the video below


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