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RasterImagePrinter Class

Summary

Supports printing of an Leadtools.RasterImage

Syntax

C++/CLI

C++

public class RasterImagePrinter

public ref class 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.

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:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms