Problem mit GDI+

Imports System.IO
Imports System.Drawing.Imaging
Public Class GalleryGenerator
    Dim stylesheetin As String
    Dim stylesheetout As String
    Public Function RotateImg(ByVal sImageFilePath As String) As Boolean
        Dim rft As RotateFlipType = RotateFlipType.RotateNoneFlipNone
        Dim img As Bitmap = Image.FromFile(sImageFilePath)
        Dim properties As PropertyItem() = img.PropertyItems
        Dim bReturn As Boolean = False
        For Each p As PropertyItem In properties
            If p.Id = 274 Then
                Dim orientation As Short = BitConverter.ToInt16(p.Value, 0)
                Select Case orientation
                    Case 1
                        rft = RotateFlipType.RotateNoneFlipNone
                    Case 3
                        rft = RotateFlipType.Rotate180FlipNone
                    Case 6
                        rft = RotateFlipType.Rotate90FlipNone
                    Case 8
                        rft = RotateFlipType.Rotate270FlipNone
                End Select
            End If
        Next
        If rft <> RotateFlipType.RotateNoneFlipNone Then
            img.RotateFlip(rft)
            System.IO.File.Delete(sImageFilePath)
            img.Save(sImageFilePath, System.Drawing.Imaging.ImageFormat.Jpeg)
            bReturn = True
        End If
        Return bReturn

    End Function
    Public Class AlphanumComparator
        Implements IComparer

        Public Function Compare(ByVal x As Object,
           ByVal y As Object) As Integer Implements IComparer.Compare

            ' [1] Validate the arguments.
            Dim s1 As String = x
            If s1 = Nothing Then
                Return 0
            End If

            Dim s2 As String = y
            If s2 = Nothing Then
                Return 0
            End If

            Dim len1 As Integer = s1.Length
            Dim len2 As Integer = s2.Length
            Dim marker1 As Integer = 0
            Dim marker2 As Integer = 0

            ' [2] Loop over both Strings.
            While marker1 < len1 And marker2 < len2

                ' [3] Get Chars.
                Dim ch1 As Char = s1(marker1)
                Dim ch2 As Char = s2(marker2)

                Dim space1(len1) As Char
                Dim loc1 As Integer = 0
                Dim space2(len2) As Char
                Dim loc2 As Integer = 0

                ' [4] Collect digits for String one.
                Do
                    space1(loc1) = ch1
                    loc1 += 1
                    marker1 += 1

                    If marker1 < len1 Then
                        ch1 = s1(marker1)
                    Else
                        Exit Do
                    End If
                Loop While Char.IsDigit(ch1) = Char.IsDigit(space1(0))

                ' [5] Collect digits for String two.
                Do
                    space2(loc2) = ch2
                    loc2 += 1
                    marker2 += 1

                    If marker2 < len2 Then
                        ch2 = s2(marker2)
                    Else
                        Exit Do
                    End If
                Loop While Char.IsDigit(ch2) = Char.IsDigit(space2(0))

                ' [6] Convert to Strings.
                Dim str1 = New String(space1)
                Dim str2 = New String(space2)

                ' [7] Parse Strings into Integers.
                Dim result As Integer
                If Char.IsDigit(space1(0)) And Char.IsDigit(space2(0)) Then
                    Dim thisNumericChunk = Integer.Parse(str1)
                    Dim thatNumericChunk = Integer.Parse(str2)
                    result = thisNumericChunk.CompareTo(thatNumericChunk)
                Else
                    result = str1.CompareTo(str2)
                End If

                ' [8] Return result if not equal.
                If Not result = 0 Then
                    Return result
                End If
            End While

            ' [9] Compare lengths.
            Return len1 - len2
        End Function
    End Class
    Private Sub GenGalleryButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GenGalleryButton.Click
        Dim indir As New IO.DirectoryInfo(InDirFolderBrowserDialog.SelectedPath)
        Dim outdir As New IO.DirectoryInfo(OutDirFolderBrowserDialog.SelectedPath)
        Dim newdirs As Array = {"scaled", "thumbs", "fullsize", "html"}
        For Each newdir In newdirs
            If Not Directory.Exists(newdir) Then
                MkDir(newdir)
            End If
        Next
        Dim files As IO.FileInfo() = indir.GetFiles()
        Dim file As IO.FileInfo
        Dim imgnamenoext As New List(Of String)
        Dim imgname As New List(Of String)
        'list the names of all files in the specified directory
        Dim scaledsize As New Single
        Dim thumbsize As New Single

        Dim cssoutwithdir As String
        cssoutwithdir = outdir.FullName.ToString & "\" & stylesheetout
        FileCopy(stylesheetin, cssoutwithdir)

        If ImgMaxSizeTextBox.Text > "850" Then
            MsgBox("Size exceeds limit. Using maximum.")
            scaledsize = "850"
        ElseIf ImgMaxSizeTextBox.Text < "300" Then
            MsgBox("Size is below the limit. Using minimum.")
            scaledsize = "300"
        Else
            scaledsize = ImgMaxSizeTextBox.Text
        End If

        For Each file In files
            If (file IsNot Nothing) And (file.Extension.ToUpper = (FormatInDDB.Text.ToUpper)) Then

                imgnamenoext.Add("x")

                RotateImg(file.FullName)

                Dim bm_source As New Bitmap(Image.FromFile(file.FullName))

                Select Case FormatOutDDB.Text
                    Case ".JPG"
                        '' Stack-Trace fuehrt hierhin (Fehler)
                        bm_source.Save(outdir.FullName & "\fullsize\" & Path.GetFileNameWithoutExtension(file.FullName) & ".JPG", System.Drawing.Imaging.ImageFormat.Jpeg)
                    Case ".PNG"
                        bm_source.Save(outdir.FullName & "\fullsize\" & Path.GetFileNameWithoutExtension(file.FullName) & ".PNG", System.Drawing.Imaging.ImageFormat.Png)
                    Case ".GIF"
                        bm_source.Save(outdir.FullName & "\fullsize\" & Path.GetFileNameWithoutExtension(file.FullName) & ".GIF", System.Drawing.Imaging.ImageFormat.Gif)
                    Case ".TIFF"
                        bm_source.Save(outdir.FullName & "\fullsize\" & Path.GetFileNameWithoutExtension(file.FullName) & ".TIFF", System.Drawing.Imaging.ImageFormat.Tiff)
                    Case ".BMP"
                        bm_source.Save(outdir.FullName & "\fullsize\" & Path.GetFileNameWithoutExtension(file.FullName) & ".BMP", System.Drawing.Imaging.ImageFormat.Bmp)
                End Select

                Dim scale_factor_sc As New Single

                If bm_source.Height > bm_source.Width Then
                    scale_factor_sc = scaledsize / bm_source.Height
                Else
                    scale_factor_sc = scaledsize / bm_source.Width
                End If

                Dim bm_dest_sc As New Bitmap( _
                    CInt(bm_source.Width * scale_factor_sc), _
                    CInt(bm_source.Height * scale_factor_sc))

                Dim gr_dest_sc As Graphics = Graphics.FromImage(bm_dest_sc)
                gr_dest_sc.InterpolationMode = Drawing2D.InterpolationMode.HighQualityBicubic

                gr_dest_sc.DrawImage(bm_source, 0, 0, _
                    bm_dest_sc.Width, _
                    bm_dest_sc.Height)

                Select Case FormatOutDDB.Text
                    Case ".JPG"
                        bm_dest_sc.Save(outdir.FullName & "\scaled\sc_" & Path.GetFileNameWithoutExtension(file.FullName) & ".JPG", System.Drawing.Imaging.ImageFormat.Jpeg)
                    Case ".PNG"
                        bm_dest_sc.Save(outdir.FullName & "\scaled\sc_" & Path.GetFileNameWithoutExtension(file.FullName) & ".PNG", System.Drawing.Imaging.ImageFormat.Png)
                    Case ".GIF"
                        bm_dest_sc.Save(outdir.FullName & "\scaled\sc_" & Path.GetFileNameWithoutExtension(file.FullName) & ".GIF", System.Drawing.Imaging.ImageFormat.Gif)
                    Case ".TIFF"
                        bm_dest_sc.Save(outdir.FullName & "\scaled\sc_" & Path.GetFileNameWithoutExtension(file.FullName) & ".TIFF", System.Drawing.Imaging.ImageFormat.Tiff)
                    Case ".BMP"
                        bm_dest_sc.Save(outdir.FullName & "\scaled\sc_" & Path.GetFileNameWithoutExtension(file.FullName) & ".BMP", System.Drawing.Imaging.ImageFormat.Bmp)
                End Select

                Dim scale_factor_th As New Single

                If bm_source.Height > bm_source.Width Then
                    scale_factor_th = thumbsize / bm_source.Height
                Else
                    scale_factor_th = thumbsize / bm_source.Width
                End If

                Dim bm_dest_th As New Bitmap( _
                    CInt(bm_source.Width * scale_factor_th), _
                    CInt(bm_source.Height * scale_factor_th))

                Dim gr_dest_th As Graphics = Graphics.FromImage(bm_dest_th)
                gr_dest_th.InterpolationMode = Drawing2D.InterpolationMode.HighQualityBicubic

                gr_dest_th.DrawImage(bm_source, 0, 0, _
                    bm_dest_th.Width, _
                    bm_dest_th.Height)
                Select Case FormatOutDDB.Text
                    Case ".JPG"
                        bm_dest_th.Save(outdir.FullName & "\thumbs\th_" & Path.GetFileNameWithoutExtension(file.FullName) & ".JPG", System.Drawing.Imaging.ImageFormat.Jpeg)
                    Case ".PNG"
                        bm_dest_th.Save(outdir.FullName & "\thumbs\th_" & Path.GetFileNameWithoutExtension(file.FullName) & ".PNG", System.Drawing.Imaging.ImageFormat.Png)
                    Case ".GIF"
                        bm_dest_th.Save(outdir.FullName & "\thumbs\th_" & Path.GetFileNameWithoutExtension(file.FullName) & ".GIF", System.Drawing.Imaging.ImageFormat.Gif)
                    Case ".TIFF"
                        bm_dest_th.Save(outdir.FullName & "\thumbs\th_" & Path.GetFileNameWithoutExtension(file.FullName) & ".TIFF", System.Drawing.Imaging.ImageFormat.Tiff)
                    Case ".BMP"
                        bm_dest_th.Save(outdir.FullName & "\thumbs\th_" & Path.GetFileNameWithoutExtension(file.FullName) & ".BMP", System.Drawing.Imaging.ImageFormat.Bmp)
                End Select
            End If
        Next

        Dim imgnamenoextsort As Array
        imgnamenoextsort = imgnamenoext.ToArray
        Array.Sort(imgnamenoextsort, New AlphanumComparator())
        My.Computer.FileSystem.WriteAllText("index.html", "<!DOCTYPE html " & vbCrLf & "  PUBLIC ""-//W3C//DTD XHTML 1.0 Transitional//EN""" & vbCrLf & "  ""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"">" & vbCrLf & "<html xmlns=""http://www.w3.org/1999/xhtml"">" & vbCrLf & "<head>" & vbCrLf & "  <title>" & PageTitleTextBox.Text & vbCrLf & "  </title>" & vbCrLf & "  <meta http-equiv=""Content-Type"" content=""text/html; charset=UTF-8"" />" & vbCrLf & "  <link rel=""stylesheet"" type=""text/css"" href=""./" & stylesheetout & """ />" & vbCrLf & "  <style type=""text/css"">" & vbCrLf & "    a {width: ""$maxpx_th""px; display:inline-block; text-align:center; margin:0px; padding:0px;}" & vbCrLf & "  </style>" & vbCrLf & "</head>" & vbCrLf & "<body>", True)
        Dim imgpg As String
        For Each img In imgnamenoextsort
            imgpg = img & ".html"
            My.Computer.FileSystem.WriteAllText("index.html", "  <a href=""html/ht_" & imgpg & """>" & vbCrLf & "    <img src=""thumbs/th_" & img & FormatOutDDB.Text & """ alt=""" & img & FormatOutDDB.Text & """ />" & vbCrLf & "  </a>", True)
        Next
        My.Computer.FileSystem.WriteAllText("index.html", "</body>" & vbCrLf & "</html>", True)

        If MagScriptCheckBox.Checked = True Then
            Dim sc As Object = CreateObject("Shell.Application")
            My.Computer.Network.DownloadFile("http://www.nihilogic.dk/labs/mojomagnify/mojomagnify.zip", CurDir() & "\mojomagnify.zip")
            Dim input As Shell32.Folder = sc.NameSpace("mojomagnify.zip")
            Dim output As Shell32.Folder = sc.NameSpace(CurDir)
            output.CopyHere(input.Items, 4)
        End If

        ChDir("html")
        Dim prevpage As String
        Dim nextpage As String
        For Each img In imgnamenoextsort
            imgpg = "ht_" & img & ".html"
            My.Computer.FileSystem.WriteAllText(imgpg, "<!DOCTYPE html " & vbCrLf & "  ""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"">" & vbCrLf & "<html xmlns=""http://www.w3.org/1999/xhtml"" xml:lang=""de_DE"" lang=""de_DE"">" & vbCrLf & "<head>" & vbCrLf & "  <title>" & PageTitleTextBox.Text & vbCrLf & "  </title>" & vbCrLf & "  <meta http-equiv=""Content-Type"" content=""text/html; charset=UTF-8"" />" & vbCrLf & "  <link type=""text/css"" href=""../" & stylesheetout & """ rel=""stylesheet"" />" & vbCrLf, True)
            If MagScriptCheckBox.Checked = True Then
                My.Computer.FileSystem.WriteAllText(imgpg, "<link type=""text/css"" href=""../mojomagnify.css"" rel=""stylesheet"" />" & vbCrLf & "  <script type=""text/javascript"" src=""../mojomagnify.js""></script>", True)
            End If
            My.Computer.FileSystem.WriteAllText(imgpg, vbCrLf & "</head>" & vbCrLf & "<body>" & vbCrLf & "  <div>" & vbCrLf & "    <p onclick=""return false;"">" & vbCrLf & "      <img src=""../scaled/sc_" & img & FormatOutDDB.Text & """ alt=""" & img & FormatOutDDB.Text & """", True)
            If MagScriptCheckBox.Checked = True Then
                My.Computer.FileSystem.WriteAllText(imgpg, " data-magnifysrc=""../fullsize/" & img & FormatOutDDB.Text & """", True)
            End If

            If Array.IndexOf(imgnamenoextsort, img) = "0" Then
                prevpage = "ht_" & imgnamenoextsort(UBound(imgnamenoextsort)) & ".html"
            Else
                prevpage = "ht_" & imgnamenoextsort(Array.IndexOf(imgnamenoextsort, img) - 1) & ".html"
            End If

            If Array.IndexOf(imgnamenoextsort, img) = UBound(imgnamenoextsort) Then
                nextpage = "ht_" & imgnamenoextsort(0) & ".html"
            Else
                nextpage = "ht_" & imgnamenoextsort(Array.IndexOf(imgnamenoextsort, img) + 1) & ".html"
            End If

            My.Computer.FileSystem.WriteAllText(imgpg, " />" & vbCrLf & "    </p>" & vbCrLf & "  </div>     " & vbCrLf & "  <div>" & vbCrLf & "    <table>" & vbCrLf & "      <tr>" & vbCrLf & "        <td align=""left"">" & vbCrLf & "          <a href=""" & prevpage & """>" & vbCrLf & "            &#9664; previous" & vbCrLf & "          </a>" & vbCrLf & "        </td>" & vbCrLf & "        <td>" & vbCrLf & "          <p>Entry " & Array.IndexOf(imgnamenoextsort, img) & " of " & UBound(imgnamenoextsort) & "</p>" & vbCrLf & "        </td>" & vbCrLf & "        <td align=""right"">" & vbCrLf & "          <a href=""" & nextpage & """>" & vbCrLf & "            &#9654; next" & vbCrLf & "          </a>" & vbCrLf & "        </td>" & vbCrLf & "        <td align=""right"">" & vbCrLf & "          <a href=""../index.html"">" & vbCrLf & "            &#9650; index" & vbCrLf & "          </a>" & vbCrLf & "        </td>" & vbCrLf & "      </tr>" & vbCrLf & "    </table>", True)

            If MagScriptCheckBox.Checked = True Then
                My.Computer.FileSystem.WriteAllText(imgpg, vbCrLf & "    <noscript><h4>Allow JavaScript for zooming!</h3></noscript>", True)
            End If

            My.Computer.FileSystem.WriteAllText(imgpg, vbCrLf & "  </div>" & vbCrLf & "</body>" & vbCrLf & "</html>", True)
        Next
    End Sub

    Private Sub InitInFolderDialogueButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles InitInFolderDialogueButton.Click
        If InDirFolderBrowserDialog.ShowDialog() = DialogResult.OK Then
            Dim indir As New IO.DirectoryInfo(InDirFolderBrowserDialog.SelectedPath)
            InDirToolTip.SetToolTip(InitInFolderDialogueButton, "Input Directory: " & indir.FullName)
        End If
    End Sub

    Private Sub InitOutFolderDialogueButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles InitOutFolderDialogueButton.Click
        If OutDirFolderBrowserDialog.ShowDialog() = DialogResult.OK Then
            Dim outdir As New IO.DirectoryInfo(OutDirFolderBrowserDialog.SelectedPath)
            OutDirToolTip.SetToolTip(InitOutFolderDialogueButton, "Output Directory: " & outdir.FullName)
            FileSystem.ChDir(outdir.FullName)
        End If
    End Sub

    Private Sub GalleryGenerator_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim indir As New IO.DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments))
        InDirFolderBrowserDialog.SelectedPath = indir.FullName
        FormatInDDB.SelectedIndex = 0
        InDirToolTip.SetToolTip(InitInFolderDialogueButton, "Input Directory: " & indir.FullName & " (default)")
        Dim outdir As New IO.DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments))
        OutDirFolderBrowserDialog.SelectedPath = outdir.FullName
        FormatOutDDB.SelectedIndex = 0
        FileSystem.ChDir(outdir.FullName)
        OutDirToolTip.SetToolTip(InitOutFolderDialogueButton, "Output Directory: " & outdir.FullName & " (default)")
        ImgMaxSizeTextBox.MaxLength = 3
        ThumbMaxSizeTextBox.MaxLength = 3
    End Sub

    Private Sub ImgMaxSizeTextBox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles ImgMaxSizeTextBox.KeyPress
        If Not Char.IsDigit(e.KeyChar) And Not Char.IsControl(e.KeyChar) Then
            e.Handled = True
        End If
    End Sub

    Private Sub ThumbMaxSizeTextBox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles ThumbMaxSizeTextBox.KeyPress
        If Not Char.IsDigit(e.KeyChar) And Not Char.IsControl(e.KeyChar) Then
            e.Handled = True
        End If
    End Sub

    Private Sub CSSBrowseButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CSSBrowseButton.Click
        CSSBrowseDialog.ShowDialog()
        stylesheetin = CSSBrowseDialog.FileName
        stylesheetout = Path.GetFileName(stylesheetin)
        CSSToolTip.SetToolTip(CSSBrowseButton, "Stylesheet: " & stylesheetin)
    End Sub
End Class