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SaveImage Event

Summary

Occurs during the file save process to provide functionality for manually handling the output image data or monitoring a progress status.

Syntax

C#
VB
Java
C++
public event EventHandler<CodecsSaveImageEventArgs> SaveImage 

Public Event SaveImage As EventHandler(Of CodecsSaveImageEventArgs) 

synchronized public void addSaveImageListener(CodecsSaveImageListener listener) 
synchronized public void removeSaveImageListener(CodecsSaveImageListener listener) 

public: 
event EventHandler<CodecsSaveImageEventArgs^>^ SaveImage 

Event Data

The event handler receives an argument of type CodecsSaveImageEventArgs containing data related to this event. The following CodecsSaveImageEventArgs properties provide information specific to this event.

PropertyDescription
Buffer Gets the memory buffer containing one or more lines of output image data that the you must provide.
Remarks

This event will fire during saving images with the Save methods. If you use this event, you must copy the image data to the provided event buffer.

You can also use this event to get information about the image being saved, provide a progress status, and/or abort the save operation. For information on how to use this event as a progress status monitor, refer to CodecsSaveOptions.RetrieveDataFromImage and CodecsSaveImageEventArgs.

Example

This example will double the density of an image as it is being saved.

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
using LeadtoolsExamples.Common; 
 
public void SaveImageExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
   string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_SaveImage.cmp"); 
 
   // Load the source file (make sure to load as 24 bits/pixel) 
   RasterImage image = codecs.Load(srcFileName, 24, CodecsLoadByteOrder.Bgr, 1, 1); 
 
   // Instruct RasterCodecs to generate the saved scanlines data for us to manipulate 
   codecs.Options.Save.RetrieveDataFromImage = true; 
 
   // Add a handler to the SaveImage event 
   codecs.SaveImage += new EventHandler<CodecsSaveImageEventArgs>(codecs_SaveImage); 
 
   // Save the image 
   codecs.Save(image, destFileName, RasterImageFormat.Cmp, 24); 
 
   codecs.SaveImage -= new EventHandler<CodecsSaveImageEventArgs>(codecs_SaveImage); 
 
   image.Dispose(); 
 
   // Clean up 
   codecs.Dispose(); 
} 
 
private void codecs_SaveImage(object sender, CodecsSaveImageEventArgs e) 
{ 
   // This example works with images saved as 24-bit per pixel only 
   Debug.Assert(e.Image.BitsPerPixel == 24); 
 
   if (e.Row == 0) 
   { 
      // Show information about the image being saved 
      Console.WriteLine("Saving an image with {0} bpp to {1}", e.Image.BitsPerPixel, e.FileName); 
      Console.WriteLine("Offset: {0}, OffsetValid: {1}", e.Offset, e.OffsetValid); 
      Console.WriteLine("Page: {0} of {1}", e.Page, e.LastPage - e.FirstPage + 1); 
      Console.WriteLine("Page percent: {0}%, Total percent: {1}%", e.PagePercent, e.TotalPercent); 
   } 
 
   Console.WriteLine("Row: {0}, Lines {1}", e.Row, e.Lines); 
 
   // Get the scanlines from the image 
   int scanlineLength = e.Image.BytesPerLine; 
   byte[] scanline = new byte[scanlineLength]; 
 
   // Loop through all the scanlines in the data 
   for (int y = 0; y < e.Lines; y++) 
   { 
      // Get this row 
      e.Buffer.GetData(y * scanlineLength, scanline, 0, scanlineLength); 
 
      // We got the data, now double the intensity 
      // Remember, this is 24-bits/pixel 
      for (int x = 0; x < scanlineLength; x++) 
      { 
         scanline[x] *= 2; 
      } 
 
      // Copy it back to the event buffer 
      e.Buffer.SetData(y * scanlineLength, scanline, 0, scanlineLength); 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
} 

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
Imports Leadtools.Svg 
 
Public Sub SaveImageExample() 
   Dim codecs As New RasterCodecs() 
 
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp") 
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_SaveImage.cmp") 
 
   ' Load the source file (make sure to load as 24 bits/pixel) 
   Dim image As RasterImage = codecs.Load(srcFileName, 24, CodecsLoadByteOrder.Bgr, 1, 1) 
 
   ' Instruct RasterCodecs to generate the saved scanlines data for us to manipulate 
   codecs.Options.Save.RetrieveDataFromImage = True 
 
   ' Add a handler to the SaveImage event 
   AddHandler codecs.SaveImage, AddressOf codecs_SaveImage 
 
   ' Save the image 
   codecs.Save(image, destFileName, RasterImageFormat.Cmp, 24) 
 
   RemoveHandler codecs.SaveImage, AddressOf codecs_SaveImage 
 
   image.Dispose() 
 
   ' Clean up 
   codecs.Dispose() 
End Sub 
 
Private Sub codecs_SaveImage(ByVal sender As Object, ByVal e As CodecsSaveImageEventArgs) 
   ' This example works with images saved as 24-bit per pixel only 
   Debug.Assert(e.Image.BitsPerPixel = 24) 
 
   If e.Row = 0 Then 
      ' Show information about the image being saved 
      Console.WriteLine("Saving an image with {0} bpp to {1}", e.Image.BitsPerPixel, e.FileName) 
      Console.WriteLine("Offset: {0}, OffsetValid: {1}", e.Offset, e.OffsetValid) 
      Console.WriteLine("Page: {0} of {1}", e.Page, e.LastPage - e.FirstPage + 1) 
      Console.WriteLine("Page percent: {0}%, Total percent: {1}%", e.PagePercent, e.TotalPercent) 
   End If 
 
   Console.WriteLine("Row: {0}, Lines {1}", e.Row, e.Lines) 
 
   ' Get the scanlines from the image 
   Dim scanlineLength As Integer = e.Image.BytesPerLine 
   Dim scanline(scanlineLength - 1) As Byte 
 
   ' Loop through all the scanlines in the data 
   For y As Integer = 0 To e.Lines - 1 
      ' Get this row 
      e.Buffer.GetData(y * scanlineLength, scanline, 0, scanlineLength) 
 
      ' We got the data, now double the intensity 
      ' Remember, this is 24-bits/pixel 
      For x As Integer = 0 To scanlineLength 
         scanline(x) = CType(scanline(x) * 2, Byte) 
      Next 
 
      ' Copy it back to the event buffer 
      e.Buffer.SetData(y * scanlineLength, scanline, 0, scanlineLength) 
   Next 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

c#[Silverlight C# Example] 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Examples; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Windows.Media; 
 
public void SaveImageExample(Stream inStreamCmp, Stream outStreamCmp) 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Load the source file (make sure to load as 24 bits/pixel) 
   RasterImage image = codecs.Load(inStreamCmp, 24, CodecsLoadByteOrder.Bgr, 1, 1); 
 
   // Add a handler to the SaveImage event 
   codecs.SaveImage += new EventHandler<CodecsSaveImageEventArgs>(codecs_SaveImage); 
 
   // Save the image 
   codecs.Save(image, outStreamCmp, RasterImageFormat.Cmp, 24); 
 
   codecs.SaveImage -= new EventHandler<CodecsSaveImageEventArgs>(codecs_SaveImage); 
 
   image.Dispose(); 
} 
 
byte[] _saveImageScanLine; 
 
void codecs_SaveImage(object sender, CodecsSaveImageEventArgs e) 
{ 
   if (e.Row == 0) 
   { 
      // Show information about the image being saved 
      Console.WriteLine("Saving an image with {0} bpp to {1}", e.Image.BitsPerPixel, e.FileName); 
      //Console.WriteLine("Offset: {0}, OffsetValid: {1}", e.Offset, e.OffsetValid); 
      Console.WriteLine("Page: {0} of {1}", e.Page, e.PageCount); 
   } 
 
   Console.WriteLine("Row: {0}, Lines {1}", e.Row, e.Lines); 
 
   // Get the scanlines from the image 
   int lastRow = e.Row + e.Lines; 
   int bytesPerLine = e.Image.BytesPerLine; 
   RasterNativeBuffer buffer = e.Buffer; 
 
   // See if we need to re-allocate the managed buffer 
   if (_saveImageScanLine == null || _saveImageScanLine.Length < bytesPerLine) 
      _saveImageScanLine = new byte[bytesPerLine]; 
 
   long offset = 0; 
   for (int y = e.Row; y < lastRow; y++) 
   { 
      // Get the row into the managed buffer 
      e.Image.Access(); 
      e.Image.GetRow(y, _saveImageScanLine, 0, bytesPerLine); 
      e.Image.Release(); 
 
      // We got the data, now double the intensity 
      // Remember, this is 24-bits/pixel 
      for (int x = 0; x < bytesPerLine; x++) 
         _saveImageScanLine[x] *= 2; 
 
      // Copy the data into the buffer 
      buffer.SetData(offset, _saveImageScanLine, 0, bytesPerLine); 
 
      // Move the pointer to the position in the buffer for the next row 
      offset += bytesPerLine; 
   } 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Windows.Media 
 
Public Sub SaveImageExample(ByVal inStreamCmp As Stream, ByVal outStreamCmp As Stream) 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   ' Load the source file (make sure to load as 24 bits/pixel) 
   Dim image As RasterImage = codecs.Load(inStreamCmp, 24, CodecsLoadByteOrder.Bgr, 1, 1) 
 
   ' Add a handler to the SaveImage event 
   AddHandler codecs.SaveImage, AddressOf codecs_SaveImage 
 
   ' Save the image 
   codecs.Save(image, outStreamCmp, RasterImageFormat.Cmp, 24) 
 
   RemoveHandler codecs.SaveImage, AddressOf codecs_SaveImage 
 
   image.Dispose() 
End Sub 
 
Private _saveImageScanLine As Byte() 
 
Private Sub codecs_SaveImage(ByVal sender As Object, ByVal e As CodecsSaveImageEventArgs) 
   If e.Row = 0 Then 
      ' Show information about the image being saved 
      Console.WriteLine("Saving an image with {0} bpp to {1}", e.Image.BitsPerPixel, e.FileName) 
      'Console.WriteLine("Offset: {0}, OffsetValid: {1}", e.Offset, e.OffsetValid); 
      Console.WriteLine("Page: {0} of {1}", e.Page, e.PageCount) 
   End If 
 
   Console.WriteLine("Row: {0}, Lines {1}", e.Row, e.Lines) 
 
   ' Get the scanlines from the image 
   Dim lastRow As Integer = e.Row + e.Lines 
   Dim bytesPerLine As Integer = e.Image.BytesPerLine 
   Dim buffer As RasterNativeBuffer = e.Buffer 
 
   ' See if we need to re-allocate the managed buffer 
   If _saveImageScanLine Is Nothing OrElse _saveImageScanLine.Length < bytesPerLine Then 
      _saveImageScanLine = New Byte(bytesPerLine - 1) {} 
   End If 
 
   Dim offset As Long = 0 
   Dim y As Integer = e.Row 
   Do While y < lastRow 
      ' Get the row into the managed buffer 
      e.Image.Access() 
      e.Image.GetRow(y, _saveImageScanLine, 0, bytesPerLine) 
      e.Image.Release() 
 
      ' We got the data, now double the intensity 
      ' Remember, this is 24-bits/pixel 
      Dim x As Integer = 0 
      Do While x < bytesPerLine 
         _saveImageScanLine(x) *= 2 
         x += 1 
      Loop 
 
      ' Copy the data into the buffer 
      buffer.SetData(offset, _saveImageScanLine, 0, bytesPerLine) 
 
      ' Move the pointer to the position in the buffer for the next row 
      offset += bytesPerLine 
      y += 1 
   Loop 
End Sub 

Requirements

Target Platforms

Help Version 20.0.2018.6.21
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Leadtools.Codecs Assembly