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LEADTOOLS Windows Forms (Leadtools.WinForms assembly)
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RasterImagePrinter Class






Members 
Leadtools.WinForms Namespace : RasterImagePrinter Class
Supports printing of an Leadtools.RasterImage
Object Model
Syntax
public class RasterImagePrinter 
'Declaration
 
Public Class RasterImagePrinter 
'Usage
 
Dim instance As RasterImagePrinter

            

        

            

            

            

        

            

            
public ref class RasterImagePrinter 

            

        

            

        

            
            
            
            
Remarks
The RasterImagePrinter provides properties and method to make the process of printing an Leadtools.RasterImage easier.



Printing using the .NET framework involves adding a handler to the System.Drawing.Printing.PrintDocument.PrintPage event. In that event handler, you setup a new instance of the RasterImagePrinter class, setup its properties as desired then call the Print method passing it the Leadtools.RasterImage to print, the page number to print and the System.Drawing.Printing.PrintPageEventArgs object obtained through your System.Drawing.Printing.PrintPageEventHandler.



Note: The RasterViewerCenterMode type has been renamed in version 15. Use the RasterPaintAlignMode enumeration instead.


            
Example
This example loads an image and then sends it to the printer. For an example on using the different rectangles associated with printing, refer to ImageRectangle.

             
    

            
            

            Copy Code
                
            

            

    

     

            
Imports Leadtools.WinForms
Imports Leadtools
Imports Leadtools.Codecs

' The image we are printing
Private myImage As RasterImage = Nothing
' The current page number being printed
Private currentPrintPageNumber As Integer
Public Sub RasterImagePrinterExample()
   ' Check if there are printers installed on this machine
   If (PrinterSettings.InstalledPrinters Is Nothing) OrElse (PrinterSettings.InstalledPrinters.Count < 1) Then
      MessageBox.Show("There are no printers installed on this machine")
      Return
   End If

   ' Load the image
   Using codecs As New RasterCodecs()
      Me.myImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif"))
   End Using

   ' Create the print document object
   Using document As New PrintDocument()
      ' Setup the document pages
      document.PrinterSettings.MinimumPage = 1
      document.PrinterSettings.MaximumPage = Me.myImage.PageCount
      document.PrinterSettings.FromPage = 1
      document.PrinterSettings.ToPage = Me.myImage.PageCount

      Dim result As DialogResult = DialogResult.OK

      ' Select the printer
      Using printDlg As New PrintDialog()
         printDlg.Document = document

         printDlg.AllowSomePages = True

         result = printDlg.ShowDialog()
      End Using

      ' Setup the page
      If result = DialogResult.OK Then
         Using pageSetupDlg As New PageSetupDialog()
            pageSetupDlg.Document = document
            pageSetupDlg.ShowDialog()
         End Using
      End If

      If result = DialogResult.OK Then
         ' Add handlers for Begin/Print and End print events
         AddHandler document.BeginPrint, AddressOf document_BeginPrint
         AddHandler document.PrintPage, AddressOf document_PrintPage
         AddHandler document.EndPrint, AddressOf document_EndPrint

         ' Use the .NET print preview dialog
         Using printPreviewDlg As New PrintPreviewDialog()
            printPreviewDlg.Document = document
            printPreviewDlg.WindowState = FormWindowState.Maximized
            result = printPreviewDlg.ShowDialog()
         End Using
      End If
   End Using

   ' Clean up
   Me.myImage.Dispose()
End Sub

Private Sub document_BeginPrint(ByVal sender As Object, ByVal e As PrintEventArgs)
   ' Reset the current page number
   ' Since we are using the print preview dialog, this event will be called twice (once
   ' to generate the print preview and once for actual printing). So, we must set this back
   ' to the first print page
   Dim document As PrintDocument = DirectCast(sender, PrintDocument)
   Me.currentPrintPageNumber = document.PrinterSettings.FromPage
End Sub

Private Sub document_EndPrint(ByVal sender As Object, ByVal e As PrintEventArgs)
   ' Nothing to do here
End Sub

Private Sub document_PrintPage(ByVal sender As Object, ByVal e As PrintPageEventArgs)
   ' Get the print document object
   Dim document As PrintDocument = DirectCast(sender, PrintDocument)

   ' Create an new LEADTOOLS image printer class
   Dim printer As New RasterImagePrinter()

   ' Set the document object so page calculations can be performed
   printer.PrintDocument = document

   ' We want to fit and center the image into the maximum print area
   printer.SizeMode = RasterPaintSizeMode.FitAlways
   printer.HorizontalAlignMode = RasterPaintAlignMode.Center
   printer.VerticalAlignMode = RasterPaintAlignMode.Center

   ' Account for FAX images that may have different horizontal and vertical resolution
   printer.UseDpi = True

   ' Print the whole image
   printer.ImageRectangle = Rectangle.Empty

   ' Use maximum page dimension ignoring the margins, this will be equivalant of printing
   ' using Windows Photo Gallery
   printer.PageRectangle = RectangleF.Empty
   printer.UseMargins = False

   ' Print the current page
   printer.Print(Me.myImage, Me.currentPrintPageNumber, e)

   ' Go to the next page
   Me.currentPrintPageNumber = Me.currentPrintPageNumber + 1

   ' Inform the printer whether we have more pages to print
   If Me.currentPrintPageNumber <= document.PrinterSettings.ToPage Then
      e.HasMorePages = True
   Else
      e.HasMorePages = False
   End If

   ' De-couple our PrintDocument from the RasterImagePrinter
   printer.PrintDocument = Nothing
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

            

   

     

            
using Leadtools.WinForms;
using Leadtools;
using Leadtools.Codecs;

// The image we are printing
private RasterImage myImage = null;
// The current page number being printed
private int currentPrintPageNumber;
public void RasterImagePrinterExample()
{
   // Check if there are printers installed on this machine
   if(PrinterSettings.InstalledPrinters == null || PrinterSettings.InstalledPrinters.Count < 1)
   {
      MessageBox.Show("There are no printers installed on this machine");
      return;
   }

   // Load the image
   using(RasterCodecs codecs = new RasterCodecs())
   {
      this.myImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir,"Ocr1.tif"));
   }

   // Create the print document object
   using(PrintDocument document = new PrintDocument())
   {
      // Setup the document pages
      document.PrinterSettings.MinimumPage = 1;
      document.PrinterSettings.MaximumPage = this.myImage.PageCount;
      document.PrinterSettings.FromPage = 1;
      document.PrinterSettings.ToPage = this.myImage.PageCount;

      DialogResult result = DialogResult.OK;

      // Select the printer
      using(PrintDialog printDlg = new PrintDialog())
      {
         printDlg.Document = document;

         printDlg.AllowSomePages = true;

         result = printDlg.ShowDialog();
      }

      // Setup the page
      if(result == DialogResult.OK)
      {
         using(PageSetupDialog pageSetupDlg = new PageSetupDialog())
         {
            pageSetupDlg.Document = document;
            pageSetupDlg.ShowDialog();
         }
      }

      if(result == DialogResult.OK)
      {
         // Add handlers for Begin/Print and End print events
         document.BeginPrint += new PrintEventHandler(document_BeginPrint);
         document.PrintPage += new PrintPageEventHandler(document_PrintPage);
         document.EndPrint += new PrintEventHandler(document_EndPrint);

         // Use the .NET print preview dialog
         using(PrintPreviewDialog printPreviewDlg = new PrintPreviewDialog())
         {
            printPreviewDlg.Document = document;
            printPreviewDlg.WindowState = FormWindowState.Maximized;
            result = printPreviewDlg.ShowDialog();
         }
      }
   }

   // Clean up
   this.myImage.Dispose();
}

private void document_BeginPrint(object sender, PrintEventArgs e)
{
   // Reset the current page number
   // Since we are using the print preview dialog, this event will be called twice (once
   // to generate the print preview and once for actual printing). So, we must set this back
   // to the first print page
   PrintDocument document = sender as PrintDocument;
   this.currentPrintPageNumber = document.PrinterSettings.FromPage;
}

private void document_EndPrint(object sender, PrintEventArgs e)
{
   // Nothing to do here
}

private void document_PrintPage(object sender, PrintPageEventArgs e)
{
   // Get the print document object
   PrintDocument document = sender as PrintDocument;

   // Create an new LEADTOOLS image printer class
   RasterImagePrinter printer = new RasterImagePrinter();

   // Set the document object so page calculations can be performed
   printer.PrintDocument = document;

   // We want to fit and center the image into the maximum print area
   printer.SizeMode = RasterPaintSizeMode.FitAlways;
   printer.HorizontalAlignMode = RasterPaintAlignMode.Center;
   printer.VerticalAlignMode = RasterPaintAlignMode.Center;

   // Account for FAX images that may have different horizontal and vertical resolution
   printer.UseDpi = true;

   // Print the whole image
   printer.ImageRectangle = Rectangle.Empty;

   // Use maximum page dimension ignoring the margins, this will be equivalant of printing
   // using Windows Photo Gallery
   printer.PageRectangle = RectangleF.Empty;
   printer.UseMargins = false;

   // Print the current page
   printer.Print(this.myImage, this.currentPrintPageNumber, e);

   // Go to the next page
   this.currentPrintPageNumber++;

   // Inform the printer whether we have more pages to print
   if(this.currentPrintPageNumber <= document.PrinterSettings.ToPage)
      e.HasMorePages = true;
   else
      e.HasMorePages = false;

   // De-couple our PrintDocument from the RasterImagePrinter
   printer.PrintDocument = null;
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

            

   

      
	
      
	
    

            
           
            
Requirements
Target Platforms

            
            
See Also
Reference
RasterImagePrinter Members

Leadtools.WinForms Namespace




        
    

	
    

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