GetPreviewImage(EventHandler<ProgressEventArgs>) Method (NefPage)

In This Topic

Returns a preview image associated with this image page.

Syntax

Visual Basic
C#
Managed Extensions for C++
C++/CLI

'Declaration

Public Overloads Overrides Function GetPreviewImage( _
   ByVal progressDelegateProgress delegate. Can be set to null (Nothing in Visual Basic).
 As System.EventHandler(Of ProgressEventArgs) _
) As Vintasoft.Imaging.VintasoftImage

public override Vintasoft.Imaging.VintasoftImage GetPreviewImage(
   System.EventHandler<ProgressEventArgs> progressDelegate
)

public: Vintasoft.Imaging.VintasoftImage* GetPreviewImage(
   System.EventHandler<ProgressEventArgs*>* progressDelegate
); override

public:
Vintasoft.Imaging.VintasoftImage^ GetPreviewImage(
   System.EventHandler<ProgressEventArgs^>^ progressDelegate
); override

Parameters

progressDelegate: Progress delegate. Can be set to null (Nothing in Visual Basic).

Return Value

The preview image associated with this ImagePage object if preview image was loaded successfully; otherwise, null.

Example

Here is an example that shows how to open Nikon NEF-file, get preview image from NEF-file and save image to a PNG-file:

VB.NET


''' <summary>
''' Opens Nikon NEF-file, gets preview image from NEF-file and saves image to a PNG-file.
''' </summary>
''' <param name="nefFilename">The name of NEF-file.</param>
Public Sub GetAndSaveNefPreviewImage(nefFilename As String)
    ' open NEF-file stream
    Using fs As New System.IO.FileStream(nefFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read)
        ' open CRNEFW-file
        Dim rawImageFile As New Vintasoft.Imaging.Codecs.ImageFiles.Raw.RawImageFile(fs)
        ' get NEF-page
        Dim nefPage As Vintasoft.Imaging.Codecs.ImageFiles.Raw.NefPage = TryCast(rawImageFile.Page, Vintasoft.Imaging.Codecs.ImageFiles.Raw.NefPage)
        ' if NEF-page is found in RAW-file
        If nefPage IsNot Nothing Then
            ' get preview image image from NEF-file
            Using previewImage As Vintasoft.Imaging.VintasoftImage = nefPage.GetThumbnailImage()
                ' save image to a PNG file
                previewImage.Save(nefFilename & ".png")
            End Using
        End If
    End Using
End Sub


/// <summary>
/// Opens Nikon NEF-file, gets preview image from NEF-file and saves image to a PNG-file.
/// </summary>
/// <param name="nefFilename">The name of NEF-file.</param>
public void GetAndSaveNefPreviewImage(string nefFilename)
{
    // open NEF-file stream
    using (System.IO.FileStream fs = new System.IO.FileStream(nefFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read))
    {
        // open CRNEFW-file
        Vintasoft.Imaging.Codecs.ImageFiles.Raw.RawImageFile rawImageFile =
            new Vintasoft.Imaging.Codecs.ImageFiles.Raw.RawImageFile(fs);
        // get NEF-page
        Vintasoft.Imaging.Codecs.ImageFiles.Raw.NefPage nefPage =
            rawImageFile.Page as Vintasoft.Imaging.Codecs.ImageFiles.Raw.NefPage;
        // if NEF-page is found in RAW-file
        if (nefPage != null)
        {
            // get preview image image from NEF-file
            using (Vintasoft.Imaging.VintasoftImage previewImage = nefPage.GetThumbnailImage())
            {
                // save image to a PNG file
                previewImage.Save(nefFilename + ".png");
            }
        }
    }
}

Requirements

Target Platforms: .NET9; .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5

Reference

NefPage Class
NefPage Members

Overload List

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