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MigraDoc Sample: Document Viewer

Modified on 2015/09/14 10:17 by Thomas Hövel Categorized as MigraDoc Samples, Samples
{s:navigationPrevUpNext|HelloMigraDoc-sample|MigraDocSamples|Images-sample}
Demonstrates all techniques you need to preview and print a MigraDoc document, and convert it to a PDF, RTF, or image file.

{TOC}
==Screen Shots==
Here is a sample screen shot:

{s:ImageThumbLink|The Document Viewer application|DocumentViewer-sample%2fDocumentViewerth.png|DocumentViewer-sample%2fDocumentViewer.png}

==Source Code==
This sample uses the {s:className|MigraDoc.Rendering.Forms.DocumentPreview} class to create a preview window.

The {s:className|DocumentPreview} object receives the document as an [MigraDocDDL|MigraDoc DDL] string. You can obtain this DDL string from your {s:className|Document} object using the {s:className|DdlWriter} class.

===Initializing DocumentPreview===
Here's the constructor:
{s:beginCsharp}
public Viewer()
{
  InitializeComponent();
&nbsp;
  // Create a new MigraDoc document
  Document document = SampleDocuments.CreateSample1();
&nbsp;
  string ddl = MigraDoc.DocumentObjectModel.IO.DdlWriter.WriteToString(document);
  this.pagePreview.Ddl = ddl;
&nbsp;
  UpdateStatusBar();
}
{s:endCsharp}
===Read MigraDoc DDL from a File===
You can use the {s:className|DdlWriter} class to store a document in a [MigraDocDDL|MigraDoc DDL] file.

This sample also shows how to read these files:
{s:beginCsharp}
/// <summary>
/// Opens and shows a MigraDoc DDL file.
/// 
/// A MigraDoc DDL file is a text based serialization of a MigraDoc document.
/// </summary>
private void miOpen_Click(object sender, System.EventArgs e)
{
  OpenFileDialog dialog = null;
  try
  {
    dialog = new OpenFileDialog();
    dialog.CheckFileExists = true;
    dialog.CheckPathExists = true;
    dialog.Filter = "MigraDoc DDL (*.mdddl)|*.mdddl|All Files (*.*)|*.*";
    dialog.FilterIndex = 1;
    dialog.InitialDirectory = Path.Combine(Directory.GetCurrentDirectory(), "..\\..");
    //dialog.RestoreDirectory = true;
    if (dialog.ShowDialog() == DialogResult.OK)
    {
      Document document = MigraDoc.DocumentObjectModel.IO.DdlReader.DocumentFromFile(dialog.FileName);
      string ddl = MigraDoc.DocumentObjectModel.IO.DdlWriter.WriteToString(document);
      this.pagePreview.Ddl = ddl;
    }
  }
  catch (Exception ex)
  {
    MessageBox.Show(ex.Message, this.Text);
    this.pagePreview.Ddl = null; // TODO has no effect
  }
  finally
  {
    if (dialog != null)
      dialog.Dispose();
  }
  UpdateStatusBar();
}
{s:endCsharp}
===Print a Document===
This sample shows how to print a document:
{s:beginCsharp}
/// <summary>
/// Prints the current document on a printer.
/// </summary>
private void miPrint_Click(object sender, System.EventArgs e)
{
  // Reuse the renderer from the preview
  DocumentRenderer renderer = this.pagePreview.Renderer;
  if (renderer != null)
  {
    int pageCount = renderer.FormattedDocument.PageCount;
&nbsp;
    // Creates a PrintDocument that simplyfies printing of MigraDoc documents
    MigraDocPrintDocument printDocument = new MigraDocPrintDocument();
&nbsp;
    // Attach the current printer settings
    printDocument.PrinterSettings = this.printerSettings;
&nbsp;
    if (this.printerSettings.PrintRange == PrintRange.Selection)
      printDocument.SelectedPage = this.pagePreview.Page;
&nbsp;
    // Attach the current document renderer
    printDocument.Renderer = renderer;
&nbsp;
    // Print the document
    printDocument.Print();
  }
}
{s:endCsharp}
===Save the Document as an RTF File===
Saving the document as an RTF file is pretty simple:
{s:beginCsharp}
/// <summary>
/// Creates a RTF file from the current document.
/// </summary>
private void miRtf_Click(object sender, System.EventArgs e)
{
  RtfDocumentRenderer rtf = new RtfDocumentRenderer();
  rtf.Render(this.pagePreview.Document, "test.rtf", null);
&nbsp;
  Process.Start("test.rtf");
}
{s:endCsharp}
===Create an Image from the Current Page===
The same drawing routines can a draw a bitmap, too:
{s:beginCsharp}
private void miBmp_Click(object sender, System.EventArgs e)
{
  int page = this.pagePreview.Page;
&nbsp;
  // Reuse the renderer from the preview
  DocumentRenderer renderer = this.pagePreview.Renderer;
  PageInfo info = renderer.FormattedDocument.GetPageInfo(page);
&nbsp;
  // Create an image
  int dpi = 150;
  int dx, dy;
  if (info.Orientation == PdfSharp.PageOrientation.Portrait)
  {
    dx = (int)(info.Width.Inch * dpi);
    dy = (int)(info.Height.Inch * dpi);
  }
  else
  {
    dx = (int)(info.Height.Inch * dpi);
    dy = (int)(info.Width.Inch * dpi);
  }
&nbsp;
  Image image = new Bitmap(dx, dy, PixelFormat.Format32bppRgb);
&nbsp;
  // Create a Graphics object for the image and scale it for drawing with 72 dpi
  Graphics graphics = Graphics.FromImage(image);
  graphics.Clear(System.Drawing.Color.White);
  float scale = dpi / 72f;
  graphics.ScaleTransform(scale, scale);
&nbsp;
  // Create an XGraphics object and render the page
  XGraphics gfx = XGraphics.FromGraphics(graphics, new XSize(info.Width.Point, info.Height.Point));
  renderer.RenderPage(gfx, page);
  gfx.Dispose();
  image.Save("test.png", ImageFormat.Png);
&nbsp;
  Process.Start("mspaint", "test.png");  // Use MSPaint, not Photoshop...
}
{s:endCsharp}
===Create a Meta File===
Meta files are also supported:
{s:beginCsharp}
private void miMetaFile_Click(object sender, EventArgs e)
{
  int page = this.pagePreview.Page;
&nbsp;
  // Reuse the renderer from the preview
  DocumentRenderer renderer = this.pagePreview.Renderer;
  PageInfo info = renderer.FormattedDocument.GetPageInfo(page);
&nbsp;
  // Create an image
  float dx, dy;
  if (info.Orientation == PdfSharp.PageOrientation.Portrait)
  {
    dx = (float)(info.Width.Inch * 72);
    dy = (float)(info.Height.Inch * 72);
  }
  else
  {
    dx = (float)(info.Height.Inch * 72);
    dy = (float)(info.Width.Inch * 72);
  }
&nbsp;
  // Create a graphics object as reference
  Graphics graphicsDisplay = CreateGraphics();
  IntPtr hdc = graphicsDisplay.GetHdc();
&nbsp;
  // There is a little difference between the display resolution (e.g. 96 DPI) and the real physical solution of the display.
  // This must be taken into account...
  DeviceInfos devInfo = DeviceInfos.GetInfos(hdc);
&nbsp;
  // Create the metafile
  Metafile metafile = new Metafile("test.emf", hdc, 
    new RectangleF(0, 0, devInfo.ScaleX * dx, devInfo.ScaleY * dy), MetafileFrameUnit.Point);
  graphicsDisplay.ReleaseHdc(hdc);
  graphicsDisplay.Dispose();
&nbsp;
  // Create a Graphics object for the metafile and scale it for drawing with 72 dpi
  Graphics graphics = Graphics.FromImage(metafile);
  graphics.Clear(System.Drawing.Color.White);
  graphics.ScaleTransform(graphics.DpiX / 72, graphics.DpiY / 72);
&nbsp;
  // Check if size is correct
  graphics.DrawLine(Pens.Red, 0, 0, dx, dy);
&nbsp;
  // Create an XGraphics object and render the page
  XGraphics gfx = XGraphics.FromGraphics(graphics, new XSize(info.Width.Point, info.Height.Point));
  renderer.RenderPage(gfx, page);
  gfx.Dispose();
&nbsp;
  metafile.Dispose();
&nbsp;
  Process.Start("test.emf");
}
{s:endCsharp}

{s:sampleSourceCode}
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MigraDoc Sample: Document Viewer
