Strange happening creating thumbnail...

[djpaul]

Hello,
I have this program and when i want to load pictures it crashes at the form.showdialog()....???

Here it goes:

 Private Sub CmbPath_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CmbPath.SelectedIndexChanged
 
 
        Dim Table As DataTable
        Dim i As Integer
        Dim ThumbSize As Integer = 160
        Dim ThumbNail As Image = Nothing
 
        FlowLayoutPanel1.Controls.Clear()
 
        Dim SQL As String = "SELECT fotonaam, fotomap, textveld FROM foto WHERE (fotomap = '" & Replace(CmbPath.Text, "'", "''") & "');"
 
        Table = SelectQuery(SQL)
        Dim ThumbPicturearr(Table.Rows.Count) As PictureBox
        Dim TextField(Table.Rows.Count) As TextBox
        Dim FlowPanel(Table.Rows.Count) As FlowLayoutPanel
 
        While Table.Rows.Count <> i
 
            Dim Photo As Image = Image.FromFile((Table.Rows(i).Item("fotomap") & "\" & Table.Rows(i).Item("fotonaam")))
            Try
 
                'Determine the scale of the imahe
                Dim Scale As Single = CSng(IIf(Photo.Width > Photo.Height, ThumbSize / Photo.Width, ThumbSize / Photo.Height))
 
                Dim Width As Integer = CInt(Photo.Width * Scale)
                Dim Height As Integer = CInt(Photo.Height * Scale)
 
                ThumbNail = Photo.GetThumbnailImage(Width, Height, Nothing, New IntPtr)
 
            Catch ex As Exception
 
                MsgBox("Error creating thumbnail:" & vbCr & ex.Message)
 
            End Try
 
            Try
                ThumbPicturearr(i) = New PictureBox
                ThumbPicturearr(i).Name = "Foto" & i
                ThumbPicturearr(i).Height = 130
                ThumbPicturearr(i).Width = 160
                ThumbPicturearr(i).BackColor = Color.DarkGray
                ThumbPicturearr(i).Image = ThumbNail
                ThumbPicturearr(i).SizeMode = PictureBoxSizeMode.Zoom
                ThumbPicturearr(i).BorderStyle = BorderStyle.Fixed3D
 
                TextField(i) = New TextBox
                TextField(i).BackColor = Color.DarkGray
                TextField(i).ForeColor = Color.WhiteSmoke
                TextField(i).Font = New Font("Ms sans serif", 12, FontStyle.Regular, GraphicsUnit.Pixel)
                TextField(i).Size = New Size(160, 20)
                TextField(i).TextAlign = HorizontalAlignment.Center
                TextField(i).Text = Table.Rows(i).Item("textveld")
                TextField(i).BorderStyle = BorderStyle.FixedSingle
                TextField(i).Enabled = False
                TextField(i).Location = New Point(ThumbPicturearr(i).Location.X - 10, ThumbPicturearr(i).Location.Y + 5)
 
                FlowPanel(i) = New FlowLayoutPanel
                FlowPanel(i).Size = New Size(170, 170)
                FlowPanel(i).BackColor = Color.DarkGray
                FlowPanel(i).FlowDirection = FlowDirection.TopDown
 
                FlowPanel(i).Controls.Add(ThumbPicturearr(i))
                FlowPanel(i).Controls.Add(TextField(i))
 
                FlowLayoutPanel1.Controls.Add(FlowPanel(i))
 
                ThumbNail.Dispose()
 
                'Increase the counter
                i = i + 1
 
            Catch ThumbError As Exception
 
                MsgBox("Error creating thumbnails for pictureboxes:" & vbCr & ThumbError.Message)
 
            End Try
 
        End While
 
        Table.Dispose()
 
 
    End Sub
 
' AND THEN HERE IT CRASHES AFTER I CALLED THE FORM YOU"LL SEE A PART OF IT UP HERE
 
 Dim EditPhoto As New Bewerk
 
        EditPhoto.ShowDialog()
 
 

At editPhoto.ShowDialog() i get the error: Parameter is not valid.
Strange, because the form has already been loaded....

Anybody an idea?

ohyeah, when i replace "ThumbPicturearr(i).Image = ThumbNail" with "ThumbPicturearr(i).Image = Image.FromFile("c:\" & Table.rows(i).Item("fotonaam")" it's working but i don't want him to make al kind of little pictures but directly add the thumbs to the pictureboxes...

Thanks in advance!

Paul

[Plater]

Which line does the error actually say it is occuring on? It shouldn't be on the ShowDialog() call, unless that form was already loaded and visible maybe?

Also, when you call .Dispose() on the iamge, it disposes all references to it.
So you would need to change this:
ThumbPicturearr(i).Image = ThumbNail
to this:
ThumbPicturearr(i).Image = ThumbNail.Clone()

If you want to call .Dispose() on the image.

[djpaul]

Hmm, Why are some answers so simpel, as the question looks very difficult???

That worked perfect!
Just added .clone beheind there an that was it!

Thanks!

(p.s. i like this forum, it's great!)

Regards, Paul