GetThumbnailImage(EventHandler<ProgressEventArgs>) Method (CrwPage)

In This Topic

Returns a thumbnail image associated with this image page.

Syntax

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

'Declaration

Public Overloads Overrides Function GetThumbnailImage( _
   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 GetThumbnailImage(
   System.EventHandler<ProgressEventArgs> progressDelegate
)

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

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

Parameters

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

Return Value

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

Example

Here is an example that shows how to open Canon CRW-file, get thumbnail image from CRW-file and save image to a PNG-file:

VB.NET


''' <summary>
''' Opens Canon CRW-file, gets thumbnail image from CRW-file and saves image to a PNG-file.
''' </summary>
''' <param name="crwFilename">The name of CRW-file.</param>
Public Sub GetAndSaveCrwThumbnail(crwFilename As String)
    ' open CRW-file stream
    Using fs As New System.IO.FileStream(crwFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read)
        ' open CRW-file
        Dim rawImageFile As New Vintasoft.Imaging.Codecs.ImageFiles.Raw.RawImageFile(fs)
        ' get CRW-page
        Dim crwPage As Vintasoft.Imaging.Codecs.ImageFiles.Raw.CrwPage = TryCast(rawImageFile.Page, Vintasoft.Imaging.Codecs.ImageFiles.Raw.CrwPage)
        ' if CRW-page is found in RAW-file
        If crwPage IsNot Nothing Then
            ' get thumbnail image from CRW-file
            Using cr2Thumbnail As Vintasoft.Imaging.VintasoftImage = crwPage.GetThumbnailImage()
                ' save image to a PNG file
                cr2Thumbnail.Save(crwFilename & ".png")
            End Using
        End If
    End Using
End Sub


/// <summary>
/// Opens Canon CRW-file, gets thumbnail image from CRW-file and saves image to a PNG-file.
/// </summary>
/// <param name="crwFilename">The name of CRW-file.</param>
public void GetAndSaveCrwThumbnail(string crwFilename)
{
    // open CRW-file stream
    using (System.IO.FileStream fs = new System.IO.FileStream(crwFilename, System.IO.FileMode.Open, System.IO.FileAccess.Read))
    {
        // open CRW-file
        Vintasoft.Imaging.Codecs.ImageFiles.Raw.RawImageFile rawImageFile =
            new Vintasoft.Imaging.Codecs.ImageFiles.Raw.RawImageFile(fs);
        // get CRW-page
        Vintasoft.Imaging.Codecs.ImageFiles.Raw.CrwPage crwPage =
            rawImageFile.Page as Vintasoft.Imaging.Codecs.ImageFiles.Raw.CrwPage;
        // if CRW-page is found in RAW-file
        if (crwPage != null)
        {
            // get thumbnail image from CRW-file
            using (Vintasoft.Imaging.VintasoftImage cr2Thumbnail = crwPage.GetThumbnailImage())
            {
                // save image to a PNG file
                cr2Thumbnail.Save(crwFilename + ".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

CrwPage Class
CrwPage Members

Overload List

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