AddPageNotificationHandler Delegate

This delegate is called for each page during a Encoder.AddPage/Encoder.AddPages method call.

Syntax

Visual Basic (Declaration)
Visual Basic (Usage)
C#
C++/CLI

Public Delegate Function AddPageNotificationHandler( _
   ByVal current As Integer, _
   ByVal max As Integer, _
   ByVal img As Image _
) As Boolean

Dim instance As New AddPageNotificationHandler(AddressOf HandlerMethod)

public delegate bool AddPageNotificationHandler( 
   int current,
   int max,
   Image img
)

public delegate bool AddPageNotificationHandler( 
   int current,
   int max,
   Image^ img
)

Parameters

current: 1-based index of the current page (frame).
max: Total number of pages (frames), that are queued to the encoder in the Encoder.AddPage/Encoder.AddPages method call.
img: The image passed to Encoder.AddPage/Encoder.AddPages method call.

Return Value

To encode the page, the delegate should return true; otherwise the page is not encoded.

Example

Sample to skip large images	Copy Code
Encoder enc = new Encoder(); enc.AddPageNotification += (current, max, image) => { if (image.Width > 6000 \|\| image.Height > 6000) return false; // The image is too large, we will skip this return true; }; // TIFF file may contain several pages enc.AddPages("image.tif");

Sample to skip large images

Copy Code

Encoder enc = new Encoder();
enc.AddPageNotification += (current, max, image) => {
    if (image.Width > 6000 || image.Height > 6000)
        return false; // The image is too large, we will skip this
    return true;
};
// TIFF file may contain several pages
enc.AddPages("image.tif");

Requirements

Target Platforms: Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family

Reference

AddPageNotificationHandler Members
DjVu Namespace
Encoder Class
AddPage Method
AddPages Method