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Save image generated by PngBitmapEncoder on server

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1 posts, 0 answers

Marcelo

28 posts

Member since:
Jul 2010
Posted 26 Oct 2011 Link to this post

Hi Guys,

We have an app that can save, as a image, its entire page, through this code:

VM:


public void ExportarParaStream(Stream fileStream, string SafeFileName)
        {
            BitmapEncoder encoder = null;
            if (SafeFileName.ToLower().EndsWith(".png"))
            {
                encoder = new PngBitmapEncoder();
            }
            else
            {
                encoder = new BmpBitmapEncoder();
            }

            Telerik.Windows.Media.Imaging.ExportExtensions.ExportToImage(PainelSelecionado.View as FrameworkElement, fileStream, encoder);

        }

        public void exportar(object sender)
        {
            SaveFileDialog saveImage = new SaveFileDialog();
            saveImage.Filter = "PNG (*.png)|*.png|Bitmap (*.bmp)|*.bmp";
            if (saveImage.ShowDialog() == true)
            {
                ExportarParaStream(saveImage.OpenFile(), saveImage.SafeFileName);
            }
        }

View/PainelSelecionado.View as FrameworkElement:

<Grid x:Name="LayoutRoot" Background="Transparent">

                <Grid.ColumnDefinitions>

                    <ColumnDefinition Width="*"/>

                    <ColumnDefinition Width="Auto"/>

                </Grid.ColumnDefinitions>

                <telerik:RadBusyIndicator [...]/>

        <ScrollViewer [...]>

                <telerik:RadDocking x:Name="xMainDock" AllowUnsafeMode="True" BorderThickness="0"

                            LayoutChangeEnded="xMainDock_LayoutChangeEnded"

                            Grid.Row="0" HasDocumentHost="False"

                            PreviewClose="xMainDock_PreviewClose">

            

                </telerik:RadDocking>

        </ScrollViewer>

        <telerik:RadPanelBar [...]>

        <telerik:RadPanelBarItem Header="Propriedades" IsChecked="{x:Null}">

               <propertyGrid:PropertyGrid OnOcorreuModificacao="PropertyGrid_OnOcorreuModificacao" SelectedObject="{Binding ObjetoSelecionado, Mode=TwoWay}" Margin="2" MaxWidth="240"/>

                    </telerik:RadPanelBarItem>

                </telerik:RadPanelBar>

    </Grid>

Now, we want to generate this image and send to our server and then save it.
What is happening is what I'm getting a odd "Parameter is not valid" exception...

Server:

[Invoke]

        [RequiresAuthentication]

        public void SalvarImagem(byte[] stream)

        {

            DirectoryInfo diretorio = new DirectoryInfo(LibGeral.getDiretorio() + "\\Imagens");

            if (!diretorio.Exists)

                diretorio.Create();

            int nImagem = 1;

            int nArquivos = diretorio.GetFiles("*.png").Count();

            string imagem = diretorio.FullName + "\\Imagem" + (nImagem + nImagem) + ".png";

            FileInfo file = new FileInfo(imagem);

            while (file.Exists)

            {

                nImagem++;

                imagem = diretorio.FullName + "\\Imagem" + (nImagem + nImagem) + ".png";

                file = new FileInfo(imagem);

            }

            MemoryStream ms = new MemoryStream();

            ms.Write(stream, 0, stream.Length);

            ms.Close();

            Bitmap bitmap = (Bitmap)Bitmap.FromStream(ms, true); /*---> Exception is throw here!

            //MemoryStream ms = new MemoryStream(stream);

            //Image img = System.Drawing.Image.FromStream(ms);

            //img.Save(imagem);

            //ms.Close();



        }

I searched and found a lot of possible resolutions and wasted a few hours trying.

One of the possible resolutions is that the image was "bad formed".
So, I'm using the PngBitmapEncoder to generate the Stream... I don't need to do the reverse thing?

You guys doesn't have a better approach? Any ideas? HELP?!

thanks in advance

Save image generated by PngBitmapEncoder on server

Marcelo