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Create PDF ?

CraigPerreault

Does anyone have a code sample to create a PDF file using the Silverlight API?

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SomeGISGuy

Take a look at this PDF libary: http://silverpdf.codeplex.com/

MarkCederholm

That's fine as long as you're not trying to render a map with a layer defined by a URL, because then you can't access the WriteableBitmap pixels to create the image to add to the PDF. I haven't been able to find a true code-behind solution. There may be a way to do it through a custom web service, but I haven't figured out how to do that either.

DominiqueBroux

Using the SL4 print with a PDF driver is another option, but there is some UI side effect (the user has to select the PDF printer)

MarkCederholm

I did find a code-behind workaround to access the restricted Map content after all! The basic approach is to export dynamic and tiled service layers through the REST API to image streams and overlay the results in a WriteableBitmap. You can then render graphics layers and UIElements on top of that. Probably more work than just using a PDF browser extension, but what the heck.

Anyway, I've created a first draft of a PDF creation class and added it to the code gallery as well as my web site: http://www.pierssen.com/arcgis10/silverlight.htm 🙂

KevinSesock

I did find a code-behind workaround to access the restricted Map content after all! The basic approach is to export dynamic and tiled service layers through the REST API to image streams and overlay the results in a WriteableBitmap. You can then render graphics layers and UIElements on top of that. Probably more work than just using a PDF browser extension, but what the heck.

Anyway, I've created a first draft of a PDF creation class and added it to the code gallery as well as my web site: http://www.pierssen.com/arcgis10/silverlight.htm 🙂

I took a look at your code and have been playing around with it. Great work! Unfortunately, I've found a bug, or rather an intentional limitation (on the Microsoft side). Your line of code:

i = wbm.Pixels[0];

(located on line 252) is throwing a handled error of type System.Security.SecurityException. The error is: "WriteableBitmap has protected content. Pixel access is not allowed." After research, I found out this is due to accessing maps from other sites. For example, if your base layers are coming from ESRI (and maybe Bing, I'm not sure), you'll get this error. This is due to the fact that WriteableBitmap has been prevented from accessing anything in another domain. Setting clientaccess.xml or crossdomain.xml doesn't seem to help.

This is a built-in limitation with WriteableBitmap as a security measure.

More information is available here:

http://forums.silverlight.net/forums/t/148589.aspx

And here:

http://forums.silverlight.net/forums/t/118030.aspx

I'm looking through seeing how best to work around this issue, but due to the fact that some of our layers are coming from ESRI, I'm not sure how we can address this. Any ideas?

MarkCederholm

You need to study the code more closely. In the download, that line is within a try block to test for restricted content. If restricted content is encountered, then the workaround is invoked.

KevinSesock

I did find a code-behind workaround to access the restricted Map content after all! The basic approach is to export dynamic and tiled service layers through the REST API to image streams and overlay the results in a WriteableBitmap. You can then render graphics layers and UIElements on top of that. Probably more work than just using a PDF browser extension, but what the heck.

Anyway, I've created a first draft of a PDF creation class and added it to the code gallery as well as my web site: http://www.pierssen.com/arcgis10/silverlight.htm 🙂

I see where you're catching the System.Security.SecurityException from WriteableBitmap for the layer defined by the URL in your code. The situation I'm running into seems to be related to the fact that by the time the code is trying to do document.Save(_streamOutPDF) (on line 198), silverPDF (or rather PdfSharp) has already closed the document. I'm getting a "PrepareForSave: Number of deleted unreachable objects: 1" from what looks to be PdfSharp.Pdf.PdfDocument.Save, followed by two "A first chance exception of type 'System.ObjectDisposedException' occurred in mscorlib.dll". I'm not familiar with SilverPDF, not to mention PdfSharp. Any thoughts on how to work around this?

Probably a newbie situation.

MarkCederholm

Interesting. I haven't encountered that error myself, but I'm wondering if in your case it takes so long to create the image that the output stream provided by Silverlight is expiring. Try asking for the output PDF file right at the start of the PDF creation stage and see if that solves the problem.

KevinSesock

Interesting. I haven't encountered that error myself, but I'm wondering if in your case it takes so long to create the image that the output stream provided by Silverlight is expiring. Try asking for the output PDF file right at the start of the PDF creation stage and see if that solves the problem.

That's what I'm doing, actually.

                SaveFileDialog savePDF = new SaveFileDialog();
                savePDF.DefaultExt = ".pdf";
                savePDF.ShowDialog();
                System.IO.Stream PDFstream = savePDF.OpenFile();
                PDFNew.SetOutputStream(PDFstream);
                PDFNew.DoExport();

MarkCederholm

Sorry, I should have been more specific. In PDFExporter.cs, comment out all the _streamOutPDF lines and move your SaveFileDialog lines to just before the document.Save line. If that's actually the problem, then I'll revise the class accordingly.

KevinSesock

Attempting to set a WriteTimeout (System.IO.Stream.WriteTimeout) on PDFstream.WriteTimeout =4000; fails with "Timeouts are not supported on this stream". I'm stumped, as I have no idea what alternatives I have.

Leave it to me to find the one situation that is just plain bizarre.

You're right though, when you say that it is taking a while. I think I can time the whole operation on my watch, it's easily over 5 seconds.

KevinSesock

Sorry, I should have been more specific. In PDFExporter.cs, comment out all the _streamOutPDF lines and move your SaveFileDialog lines to just before the document.Save line. If that's actually the problem, then I'll revise the class accordingly.

Close. Unfortunately SaveFileDialog has to be called by a user-initiated event, like a Button_Click event. I created a new property for a SaveFileDialog object, and passed it in from my Button_Click event after showing the dialog, then created the stream from the SaveFileDialog.OpenFile() method inside PDFExporter.cs. Thanks for the suggestion, I now have a PDF file to work with.

Unfortunately, I seem to be missing layers. How exactly does your class determine the order of your layers?

gis_KIWI4_0-1778542459789.png

KevinSesock

Close. Unfortunately SaveFileDialog has to be called by a user-initiated event, like a Button_Click event. I created a new property for a SaveFileDialog object, and passed it in from my Button_Click event after showing the dialog, then created the stream from the SaveFileDialog.OpenFile() method inside PDFExporter.cs. Thanks for the suggestion, I now have a PDF file to work with.

Unfortunately, I seem to be missing layers. How exactly does your class determine the order of your layers?

Not only am I missing layers, but a Dynamic Service Layer is drawing... oddly. As in, the colors of the Dynamic Service Layer are messed up. I assume this is in the bmp conversion method. Any thoughts?

Mark:

I'd be happy to email you the pdfs that were output if you'd like to take a look. Otherwise I'll debug later, right now I've got to get other things taken care of in my app, so maybe I can find a fix if you don't have the time.

TomArnold1

Can someone send an example of they are using the export to pdf? Thank you.

CraigPerreault

using PdfSharp.Pdf;

        private void PDFbutton_MouseLeftButtonUp(object sender, MouseEventArgs e)
        {
                    SaveFileDialog savePDF = new SaveFileDialog();
                    savePDF.Filter = "PDF file format|*.pdf";
                    savePDF.DefaultExt = ".pdf";
                    if (savePDF.ShowDialog() == true)
                    {
                        System.IO.Stream PDFstream = savePDF.OpenFile();
                        PDFExporter PDFNew = new PDFExporter();
                        PDFNew.SetMap(myMap);
                        PDFNew.SetOutputStream(PDFstream);
                        PDFNew.DoExport();
                    }
        }

DavidAshton

Can someone tell me where to place the download dll from the PDF libary: http://silverpdf.codeplex.com/

I tried to register the PDF library silverPDF.dll but no luck

So I just added it to my vs project as a ref.... but I'm getting an error message stating it could load the assembly file silverPDF.dll

If I go to the file and right click it and click register. The "Register ArcGIS Assembly" dialog window pops up. I can either select Desktop or Server. I tired both and they both give me the error "Registration Failed" - Could not load file or assembly 'System Windows, Version = 2.0.5.0 culture=neutral, PublicKeyToken 7cec85d7bea7798e or one of its dependencies. The system cannont find the specified.

O.K. Here's a little more info. After just adding it to the references in VS I ran debug and got an error stating it was being blocked but I unblocked it after downloading so I went into the debug directory and unblocked again. No the application luanches but it just hangs and never gets past the original silverlight blue logo. When I take out all the PDF stuff the app is fine.

Thanks

DavidAshton

I got it....

Thanks Kevin! Great Tool.

VikramS

Hi DAvid ,

Can u please tell me how did u register silver.dll . I am also getting the same error .. Thank u very much

I got it....

Thanks Kevin! Great Tool.

DavidAshton

I just opened my project in VS.
Right click on References
Click Add Reference
Click the Browse button and browse to the dll. This add the dll to your VS project

DavidFlack

Great tool Kevin! It worked for me pretty quickly even though I have very limited knowledge of Server, C#, and Silverlight.

I did find an unhandled exception when I accidentally left a PDF open and went to create one with the same file name/location. Nothing serious- just something you may want to consider for a new version. Thanks again.

DarinaTchountcheva

Kevin, thank you for sharing this great tool with us. Awsome!

David, I have encountered the same exception, and fixing it wasn't as straight forward as catching the error, so I have decided to share my solution and the sources I have used. Maybe someone will come with a better one.

There seems to be a bug in Silverlight's SaveFileStream, which is discussed in greater details here:

http://betaforums.silverlight.net/forums/p/176869/440957.aspx

I have also noticed that silverPDF is a pretty big library. My .xap jumped to 990 KB from 140 KB just by adding it as reference. And of course this affects the loading time of the application. To avoid this I have implemented a dynamic loading on demand of this library when the user decides to create a PDF. Here is the article I have followed:

http://msdn.microsoft.com/en-us/library/cc903931(VS.95).aspx

And this is my final code:

#region PDF creation

        AssemblyPart apSilverPDF;
        System.IO.Stream PDFStream;


        /// <summary>
        /// Handle "Create PDF" button click
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            LoadPDFLibraryAndSaveFile();
        }
        
        /// <summary>
        /// Load the silverPDF library if it hasn't been loaded already
        /// or use the library if already loaded        
        /// </summary>
        private void LoadPDFLibraryAndSaveFile()
        {
            SaveFileDialog savePDF = new SaveFileDialog();
            savePDF.Filter = "PDF file format|*.pdf";
            savePDF.DefaultExt = ".pdf";
            if (savePDF.ShowDialog() == true)
            {
                //catch the error if the user tries to save over a file that is currently open
                try                
                {
                    PDFStream = savePDF.OpenFile();
                    //if silverPDF library is not loaded already, load it
                    if (apSilverPDF == null)
                    {
                        LoadPDFLibrary();
                    }
                    else
                    {
                        //if the library is loaded, just save the PDF file
                        SavePDF();
                    }
                }
                catch (IOException ioe)
                {
                    //tell the user the file is open
                    MessageBox.Show("Selected PDF file is open. Close the file and try again!", "Open File Error", MessageBoxButton.OK);
                }                
            }
        }

        /// <summary>
        /// Send a request to load the silverPDF library dynamically
        /// </summary>
        private void LoadPDFLibrary()
        {
            WebClient client = new WebClient();
            client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
            client.OpenReadAsync(new Uri("silverPDF.dll", UriKind.Relative));
        }

        /// <summary>
        /// Load the library and use it to create the PDF
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
        {
            if ((e.Error == null) && (e.Cancelled == false))
            {
                apSilverPDF = new AssemblyPart();
                apSilverPDF.Load(e.Result);

                SavePDF();
            }
            else
            {
                MessageBox.Show("There was a problem loading PDF Library", "PDF Library Loading Error", MessageBoxButton.OK);
            }
        }

        
        /// <summary>
        /// Save the PDF File
        /// </summary>
        private void SavePDF()
        {
            PDFExporter PDFNew = new PDFExporter();
            //add map to the PDF
            PDFNew.SetMap(Map);
            //add navigation with scale bar to the PDF
            PDFNew.AddElement(navigationGrid);            
            PDFNew.SetOutputStream(PDFStream);
            PDFNew.DoExport();
        }

        #endregion

And in App.xaml.cs:

private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            // If the app is running outside of the debugger then report the exception using
            // the browser's exception mechanism. On IE this will display it a yellow alert 
            // icon in the status bar and Firefox will display a script error.
            if (!System.Diagnostics.Debugger.IsAttached)
            {

                // NOTE: This will allow the application to continue running after an exception has been thrown
                // but not handled. 
                // For production applications this error handling should be replaced with something that will 
                // report the error to the website and stop the application.
                e.Handled = true;

                //This is required to swallow an error when saving a file over a file that is open.
                //This is a bug, and application crashes if this line is not there.
                if (e.ExceptionObject.StackTrace.IndexOf("SaveFileStream") != -1) return;
                Deployment.Current.Dispatcher.BeginInvoke(delegate { ReportErrorToDOM(e); });
            }
        }

MikkelHylden

I have this all working pretty well, except for the Image Service layer in my map. That throws the dreaded "Catastrophic Failure" message, and then I just get the last layer added to my map. If I leave out the image service layer from the map, I can get the image as expected (visible layers as on map).

Does anyone have a way to successfully get an image service layer to be incorporated in this solution? I have already modified the URI section to not include the format (since f=image is not a valid format for the image server service export function). I tried passing BMP and PNG instead, but those don't work either.

MarkCederholm

Actually, ArcGIS image server does support the f=image option. The whole point of the PDF exporter class is that it depends upon services being able to stream bytes directly to the client. It works with the image service I use just fine.

MarkCederholm

Whoops, I take back what I said. I found a couple of bugs after all in the uploaded version. I've just uploaded a new version (1.1) with these fixes: 1) Uses "exportImage" rather than "export" for image services, 2) Sets bboxSR for layers with a different SR than the map.

I've started thinking about the best way to deal with stale output stream handles, and may set up an optional two-stage export process.

DavidFlack

Thanks Darina- that try/catch block did the trick. I wasn't able to get the dynamic loading figured out that this point, but I'll probably get back to that someday. My app will get fairly heavy printing use, so I don't think it's terrible to pre-load it in this case.

For others, my code is as follows

       private void Print(object sender, RoutedEventArgs e)
        {
            SaveFileDialog savePDF = new SaveFileDialog();
            savePDF.Filter = "PDF file format|*.pdf";
            savePDF.DefaultExt = ".pdf";
            if (savePDF.ShowDialog() == true)
            {
                try
                {
                    System.IO.Stream PDFstream = savePDF.OpenFile();
                    PDFExporter PDFNew = new PDFExporter();
                    PDFNew.SetMap(MyMap);
                    PDFNew.SetOutputStream(PDFstream);
                    PDFNew.DoExport();
                }
                catch (IOException ioe)
                {
                    //tell user the file is open
                    MessageBox.Show("Selected PDF file is open. Close file and try again!", "Open File Error", MessageBoxButton.OK);
                }
                
            }
        }

ErikEngstrom

I am trying to implement a PDF printing option and have chosen to use the sample code from Mark C. The problem I am having is that I get the "Map Not Set" error in the PDFExporter IntStartExport() catch. So, my map is essentially coming up as null.

My question then, is how do I set my map resource for this?

This is what I did:
First, I downloaded the SilverPDF DLL and added it to my project as a reference.
I then added a UserControl (ExportPDF.XAML) to my application and used the code from Mark C's download. I also added the PDFExporter.cs to my project (both the user control and the PDFExporter are in the root of the project). I created a namespace to my project and call the usercontrol from the namespace, ie:
<showTest:ExportPDF x:Name="whatever" >
</showTest:ExportPDF>

There doesn't seem to be a Map="" property available to bind the map to the user control.
I've played with this from PDFExporter.cs:

        
public void SetMap(Map TheMap)
    {
        _Map = TheMap;
    }

And this from ExportPDF.xaml.cs:

        public void SetMap(Map TheMap)
        {
            _Exporter.SetMap(TheMap);
        }

For reference my project is named "showTest" and my map element name is "MyMap"
I'm no code junky, so I apologize for not being able to get too specific. I also will not claim that the answer is not totally obvious, because it probably is...

Thanks for any and all help!!!!

DouglasGennetten

Is anyone doing PDF exporting from the WPF API? Any examples?

victorruiz

I had this problem too, with bitmap conversion, so I'm using this.

1. First I changed Bitmap2Stream to this

private void Bitmap2Stream()
    {
// Encode to stream

        int hgt = _wbm.PixelHeight;
        int wdth = _wbm.PixelWidth;
        EditableImage ei = new EditableImage(wdth, hgt);

        for (int y = 0; y < hgt; y++)
        {
            for (int x = 0; x < wdth; x++)
            {
                int pixel = _wbm.Pixels[((y * wdth) + x)];
                ei.SetPixel(x, y, (byte)((pixel >> 16) & 0xff), (byte)((pixel >> 😎 & 0xff), (byte)(pixel & 0xff), (byte)((pixel >> 24) & 0xff));
            }
        }

        //Get the stream from the encoder and create byte array from it
        System.IO.Stream pngStream = ei.GetStream();
        _stream = pngStream;
        _wbm = null;
}

The EditableImage class you can get it from the attachment file, I can't remember the Url where I got this files sorry ='C.

2 Second you must add the "format" parameter with the jpg option in the Layer2Bitmap function
string sData = "?f=image";
sData += "&format=jpg";

Doing this you will get a nice image inside your PDF.

Bye

Helpers.rar

ErikEngstrom

I am trying to implement a PDF printing option and have chosen to use the sample code from Mark C. The problem I am having is that I get the "Map Not Set" error in the PDFExporter IntStartExport() catch. So, my map is essentially coming up as null.

My question then, is how do I set my map resource for this?

This is what I did:
First, I downloaded the SilverPDF DLL and added it to my project as a reference.
I then added a UserControl (ExportPDF.XAML) to my application and used the code from Mark C's download. I also added the PDFExporter.cs to my project (both the user control and the PDFExporter are in the root of the project). I created a namespace to my project and call the usercontrol from the namespace, ie:
<showTest:ExportPDF x:Name="whatever" >
</showTest:ExportPDF>

There doesn't seem to be a Map="" property available to bind the map to the user control.
I've played with this from PDFExporter.cs:
        
public void SetMap(Map TheMap)
    {
        _Map = TheMap;
    }
And this from ExportPDF.xaml.cs:
        public void SetMap(Map TheMap)
        {
            _Exporter.SetMap(TheMap);
        }
For reference my project is named "showTest" and my map element name is "MyMap"
I'm no code junky, so I apologize for not being able to get too specific. I also will not claim that the answer is not totally obvious, because it probably is...

Thanks for any and all help!!!!

I'm still having issues with this... Any advice?

PauloVerissimo

An easier option is to print using a pdf printer driver.
You can choose what to print, in this example, I only print the Map.
Here is the C# code:
...
using System.Windows.Ink;
using System.Windows.Printing;
private void buttonPrint_Click(object sender, System.Windows.RoutedEventArgs e)
{     PrintDocument document = new PrintDocument();
      document.PrintPage += (s, args) =>
      {    args.PageVisual = Map;
      };
      document.Print("Map");
}

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