public static GdPictureStatus GetDocumentPreview( 
   Stream FileStream,
   string FileName,
   int ThumbnailWidth,
   int ThumbnailHeight,
   int BackColor,
   bool ThumbnailFitToPageSize,
   ref DocumentFormat DocumentFormat,
   ref int ThumbnailID,
   ref int PageCount
)

public function GetDocumentPreview( 
    FileStream: Stream;
    FileName: String;
    ThumbnailWidth: Integer;
    ThumbnailHeight: Integer;
    BackColor: Integer;
    ThumbnailFitToPageSize: Boolean;
   var  DocumentFormat: DocumentFormat;
   var  ThumbnailID: Integer;
   var  PageCount: Integer
): GdPictureStatus; static; 

public static function GetDocumentPreview( 
   FileStream : Stream,
   FileName : String,
   ThumbnailWidth : int,
   ThumbnailHeight : int,
   BackColor : int,
   ThumbnailFitToPageSize : boolean,
   DocumentFormat : DocumentFormat,
   ThumbnailID : int,
   PageCount : int
) : GdPictureStatus;

public: static GdPictureStatus GetDocumentPreview( 
   Stream* FileStream,
   string* FileName,
   int ThumbnailWidth,
   int ThumbnailHeight,
   int BackColor,
   bool ThumbnailFitToPageSize,
   ref DocumentFormat DocumentFormat,
   ref int ThumbnailID,
   ref int PageCount
) 

public:
static GdPictureStatus GetDocumentPreview( 
   Stream^ FileStream,
   String^ FileName,
   int ThumbnailWidth,
   int ThumbnailHeight,
   int BackColor,
   bool ThumbnailFitToPageSize,
   DocumentFormat% DocumentFormat,
   int% ThumbnailID,
   int% PageCount
) 

'Declaration
 
Public Overloads Shared Function GetDocumentPreview( _
   ByVal FileStream As Stream, _
   ByVal FileName As String, _
   ByVal ThumbnailWidth As Integer, _
   ByVal ThumbnailHeight As Integer, _
   ByVal BackColor As Integer, _
   ByVal ThumbnailFitToPageSize As Boolean, _
   ByRef DocumentFormat As DocumentFormat, _
   ByRef ThumbnailID As Integer, _
   ByRef PageCount As Integer _
) As GdPictureStatus

Parameters

FileStream

A System.IO.Stream object. This stream object must be initialized before it can be sent into this method and it should remain open for subsequent use. At the same, the provided stream object must support seeking, otherwise the method will fail.

FileName

The name of the original file. It can be an empty string. Providing this parameter can help the format detection algorithm to distinguish format using the same signature pattern.

ThumbnailWidth

The required width of the generated thumbnail of the first page, in pixels.

ThumbnailHeight

The required height of the generated thumbnail of the first page, in pixels.

BackColor

The required background color of the generated thumbnail, in ARGB format.

ThumbnailFitToPageSize

Specifies if the size of the produced thumbnail is automatically adjusted to don't have any margin.

DocumentFormat

Output parameter. A member of the DocumentFormat enumeration. The format of the specified document.

ThumbnailID

Output parameter. The unique image identifier of a newly generated thumbnail image of the first page of the specified document. Be aware that you need to subsequently release this image from memory using the GdPictureDocumentUtilities.DisposeImage method after you have used it.

PageCount

Output parameter. The total number of pages of the specified document.

Return Value

Be aware that the specified stream should remain open during running this method and it needs to be closed by the user as well. At the same, the provided stream must support seeking, otherwise the method will fail.

Likewise, you need to release the thumbnail's image resource from memory using the GdPictureDocumentUtilities.DisposeImage method.

This method requires the Image Conversion component to run.

Reference

GdPictureDocumentUtilities Class
GdPictureDocumentUtilities Members
Overload List
DisposeImage Method