HasAttachedThumbnail Method (GdPictureImaging)

In This Topic

Some images embed a thumbnail bitmap for previewing purpose. This method helps to determine if a specific GdPicture image has one.

Syntax

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

'Declaration
 
Public Function HasAttachedThumbnail( _
   ByVal ImageID As Integer _
) As Boolean

public bool HasAttachedThumbnail( 
   int ImageID
)

public function HasAttachedThumbnail( 
    ImageID: Integer
): Boolean;

public function HasAttachedThumbnail( 
   ImageID : int
) : boolean;

public: bool HasAttachedThumbnail( 
   int ImageID
)

public:
bool HasAttachedThumbnail( 
   int ImageID
)

Parameters

ImageID: GdPicture image identifier.

Return Value

True if a thumbnail bitmap is attached to the image, False otherwise.

Remarks

Use the GetStat() method to check if this method has completed successfully.

This method requires the Image Documents component to run.

Example

Removing the existing thumbnail and creating and attaching a new one to a GdPicture image.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.jpg");
 
    int thumbnailID = 0;
    if (gdpictureImaging.HasAttachedThumbnail(imageID))
    {
        // Get the already attached thumbnail and save it as an image, then detach it.
        thumbnailID = gdpictureImaging.GetAttachedThumbnail(imageID);
        gdpictureImaging.SaveAsJPEG(thumbnailID, "thumbnail.jpg", 75);
        gdpictureImaging.DetachThumbnail(imageID);
        gdpictureImaging.ReleaseGdPictureImage(thumbnailID);
    }
 
    // Create a new thumbnail with a system-defined size and attach it to an image.
    thumbnailID = gdpictureImaging.CreateThumbnail(imageID, 0, 0);
    gdpictureImaging.AttachThumbnail(imageID, thumbnailID);
 
    // Release used resources.
    gdpictureImaging.ReleaseGdPictureImage(thumbnailID);
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
GetAttachedThumbnail Method