Encoder.Compression-Feld

Ein Encoder-Objekt, das der GUID für die Komprimierungs-Parameterkategorie initialisiert wird.

Namespace: System.Drawing.Imaging
Assembly: System.Drawing (in system.drawing.dll)

Syntax

'Declaration
Public Shared ReadOnly Compression As Encoder
'Usage
Dim value As Encoder

value = Encoder.Compression

public static readonly Encoder Compression

public:
static initonly Encoder^ Compression

public static final Encoder Compression

public static final var Compression : Encoder

Beispiel

Im folgenden Beispiel wird ein Bitmap-Objekt aus einer BMP-Datei erstellt. Das Bild wird als TIFF-Datei mit LZW-Komprimierung gespeichert.

Imports System
Imports System.Drawing
Imports System.Drawing.Imaging


Class Example_SetTIFFCompression
    
    Public Shared Sub Main() 
        Dim myBitmap As Bitmap
        Dim myImageCodecInfo As ImageCodecInfo
        Dim myEncoder As Encoder
        Dim myEncoderParameter As EncoderParameter
        Dim myEncoderParameters As EncoderParameters
        
        ' Create a Bitmap object based on a BMP file.
        myBitmap = New Bitmap("Shapes.bmp")
        
        ' Get an ImageCodecInfo object that represents the TIFF codec.
        myImageCodecInfo = GetEncoderInfo("image/tiff")
        
        ' Create an Encoder object based on the GUID
        ' for the Compression parameter category.
        myEncoder = Encoder.Compression
        
        ' Create an EncoderParameters object.
        ' An EncoderParameters object has an array of EncoderParameter
        ' objects. In this case, there is only one
        ' EncoderParameter object in the array.
        myEncoderParameters = New EncoderParameters(1)
        
        ' Save the bitmap as a TIFF file with LZW compression.
        myEncoderParameter = New EncoderParameter(myEncoder, Fix(EncoderValue.CompressionLZW))
        myEncoderParameters.Param(0) = myEncoderParameter
        myBitmap.Save("ShapesLZW.tif", myImageCodecInfo, myEncoderParameters)
    
    End Sub 'Main
    
    Private Shared Function GetEncoderInfo(ByVal mimeType As String) As ImageCodecInfo 
        Dim j As Integer
        Dim encoders() As ImageCodecInfo
        encoders = ImageCodecInfo.GetImageEncoders()
        
        j = 0
        While j < encoders.Length
            If encoders(j).MimeType = mimeType Then
                Return encoders(j)
            End If
            j += 1
        End While
        Return Nothing
    
    End Function 'GetEncoderInfo
End Class 'Example_SetTIFFCompression

using System;
using System.Drawing;
using System.Drawing.Imaging;
class Example_SetTIFFCompression
{
    public static void Main()
    {
        Bitmap myBitmap;
        ImageCodecInfo myImageCodecInfo;
        Encoder myEncoder;
        EncoderParameter myEncoderParameter;
        EncoderParameters myEncoderParameters;
                     
        // Create a Bitmap object based on a BMP file.
        myBitmap = new Bitmap("Shapes.bmp");
                     
        // Get an ImageCodecInfo object that represents the TIFF codec.
        myImageCodecInfo = GetEncoderInfo("image/tiff");
                     
        // Create an Encoder object based on the GUID
        // for the Compression parameter category.
        myEncoder = Encoder.Compression;
                     
        // Create an EncoderParameters object.
        // An EncoderParameters object has an array of EncoderParameter
        // objects. In this case, there is only one
        // EncoderParameter object in the array.
        myEncoderParameters = new EncoderParameters(1);
                     
        // Save the bitmap as a TIFF file with LZW compression.
        myEncoderParameter = new EncoderParameter(
            myEncoder,
            (long)EncoderValue.CompressionLZW);
        myEncoderParameters.Param[0] = myEncoderParameter;
        myBitmap.Save("ShapesLZW.tif", myImageCodecInfo, myEncoderParameters);
    }
    private static ImageCodecInfo GetEncoderInfo(String mimeType)
    {
        int j;
        ImageCodecInfo[] encoders;
        encoders = ImageCodecInfo.GetImageEncoders();
        for(j = 0; j < encoders.Length; ++j)
        {
            if(encoders[j].MimeType == mimeType)
                return encoders[j];
        }
        return null;
    }
}

#using <System.Drawing.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Drawing::Imaging;
static ImageCodecInfo^ GetEncoderInfo( String^ mimeType );
int main()
{
   Bitmap^ myBitmap;
   ImageCodecInfo^ myImageCodecInfo;
   Encoder^ myEncoder;
   EncoderParameter^ myEncoderParameter;
   EncoderParameters^ myEncoderParameters;
   
   // Create a Bitmap object based on a BMP file.
   myBitmap = gcnew Bitmap( "Shapes.bmp" );
   
   // Get an ImageCodecInfo object that represents the TIFF codec.
   myImageCodecInfo = GetEncoderInfo( "image/tiff" );
   
   // Create an Encoder object based on the GUID
   // for the Compression parameter category.
   myEncoder = Encoder::Compression;
   
   // Create an EncoderParameters object.
   // An EncoderParameters object has an array of EncoderParameter
   // objects. In this case, there is only one
   // EncoderParameter object in the array.
   myEncoderParameters = gcnew EncoderParameters( 1 );
   
   // Save the bitmap as a TIFF file with LZW compression.
   myEncoderParameter = gcnew EncoderParameter( myEncoder,(__int64)EncoderValue::CompressionLZW );
   myEncoderParameters->Param[ 0 ] = myEncoderParameter;
   myBitmap->Save( "ShapesLZW.tif", myImageCodecInfo, myEncoderParameters );
}

static ImageCodecInfo^ GetEncoderInfo( String^ mimeType )
{
   int j;
   array<ImageCodecInfo^>^encoders;
   encoders = ImageCodecInfo::GetImageEncoders();
   for ( j = 0; j < encoders->Length; ++j )
   {
      if ( encoders[ j ]->MimeType == mimeType )
            return encoders[ j ];

   }
   return nullptr;
}

import System.* ;
import System.Drawing.* ;
import System.Drawing.Imaging.*;

class Example_SetTIFFCompression
{
    public static void main(String[] args)
    {
        Bitmap myBitmap;
        ImageCodecInfo myImageCodecInfo;
        Encoder myEncoder;
        EncoderParameter myEncoderParameter;
        EncoderParameters myEncoderParameters;
          
        // Create a Bitmap object based on a BMP file.
        myBitmap = new Bitmap("Shapes.bmp");
          
        // Get an ImageCodecInfo object that represents the TIFF codec.
        myImageCodecInfo = GetEncoderInfo("image/tiff");
                  
        // Create an Encoder object based on the GUID
        // for the Compression parameter category.
        myEncoder = Encoder.Compression;
          
        // Create an EncoderParameters object.
        // An EncoderParameters object has an array of EncoderParameter
        // objects. In this case, there is only one
        // EncoderParameter object in the array.
        myEncoderParameters = new EncoderParameters(1);
          
        // Save the bitmap as a TIFF file with LZW compression.
        myEncoderParameter = new EncoderParameter(myEncoder,
                            (long)(EncoderValue.CompressionLZW));
        myEncoderParameters.get_Param().set_Item( 0 , myEncoderParameter );
        myBitmap.Save("ShapesLZW.tif", myImageCodecInfo, myEncoderParameters);
    } //main
   
    private static ImageCodecInfo GetEncoderInfo(String mimeType) 
    {
        int j;
        ImageCodecInfo encoders[];
        encoders = ImageCodecInfo.GetImageEncoders();
        for(j = 0; j < encoders.length; j++) {
            if (encoders[j].get_MimeType().Equals(mimeType)) {
                return encoders[j];
            }
        }
        return null ;
    } //GetEncoderInfo
} //Example_SetTIFFCompression

Plattformen

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

Siehe auch

Referenz

Encoder-Klasse
Encoder-Member
System.Drawing.Imaging-Namespace