GetThumbnailImage Method

public RasterImage GetThumbnailImage()

'Declaration
 

Public Function GetThumbnailImage() As RasterImage

'Usage
 

Dim instance As DocumentPage
Dim value As RasterImage
 
value = instance.GetThumbnailImage()

public RasterImage getThumbnailImage()
            

public:
RasterImage^ GetThumbnailImage(); 

Return Value

This method uses the value set in DocumentImages.ThumbnailPixelSize to determine the size of the thumbnail image. The returned image data will have 24 bits per pixel.

This method works as follows (the "item" is a thumbnail image with the specified size):

1. If an item was found in the cache, it is returned right away. This is available if the document was created using the cache system. and Document.CacheOptions contains DocumentCacheOptions.PageThumbnailImage.

2. GetImage is used to create the thumbnail image.

3. If this document uses the cache system (Document.HasCache is true), then the RasterImage object is saved to the cache before it is returned. Next time this method is called, the image will be returned from the cache directly without loading it from the file or creating a new instance.

The returned RasterImage object is not used by this Document, the user is responsible for deleting it using RasterImage.Dispose after it has been used.

DocumentImages.GetThumbnailsGrid can be used to return the thumbnails of more than one page using a single call.

The LEADTOOLS Document Viewer uses DocumentPage.GetThumbnailImage and DocumentImages.GetThumbnailsGrid for generating the thumbnails list of a document.

Refer to Loading Using LEADTOOLS Documents Library for more information.

Target Platforms

Reference

DocumentPage Class
DocumentPage Members