Releasing a JPG from the Image control

Question

Hello,

I have to use the Image control in an application I'm writing in VB in VS 2012. I cannot get the control to release the jpg. When I try to move the jpg, I get the error saying the file cannot be move because it is in use by another process.

I've tried to clear the Image box by saying:

picBox.Image = Nothing

picBox.Image.Dispose

picBox = Nothing

How can I get the Image box to release the file?

I use the following code to load the jpg:

    Public Sub DisplayPic(strPicName As String, picBox As PictureBox)

        Dim intPicBoxHeight As Integer
        Dim intPicBoxWidth As Integer

        Dim scale_factor_height As Single
        Dim scale_factor_width As Single
        Dim bm_source As Bitmap
        Dim bm_destination As Bitmap
        Dim gr_destination As Graphics

        bm_source = New Bitmap(strPicName)

        intPicBoxHeight = picBox.Size.Height
        intPicBoxWidth = picBox.Size.Width

        scale_factor_height = intPicBoxHeight / bm_source.Height
        scale_factor_width = intPicBoxWidth / bm_source.Width
        bm_destination = New Bitmap( _
                    CInt(bm_source.Width * scale_factor_width), _
                    CInt(bm_source.Height * scale_factor_height))

        gr_destination = Graphics.FromImage(bm_destination)
        gr_destination.DrawImage(bm_source, 0, 0, _
            bm_destination.Width + 1, _
            bm_destination.Height + 1)
        picBox.Image = bm_destination
        picBox.Visible = True

    End Sub

where strPicName is the name of the jpg file.

Thanks

Answer 1

When I try to move the jpg, I get the error saying the file cannot be move because it is in use by another process.

I've tried to clear the Image box by saying:

picBox.Image = Nothing

The reference that is preventing the file from being moved is bm_source, not the picture box. You are copying the file from bm_source to bm_destination, so you no longer need bm_source.

Answer 2

Hi,

you'll have to Dispose the initial image you get from a file, here its bm_source.

After redrawing it to your bm_destination simply call:

bm_source.Dispose()
bm_source = Nothing

Then you can move the file.

Regards,

  Thorsten

Answer 3

It worked! Thank you