TImageEnIO.Seek

Declaration

function Seek(Destination: TIEIOSeekDestination; FileName : WideString = ''): Integer; overload;
function Seek(Destination: TIEIOSeekDestination; Stream: TStream; FileFormat: TIOFileType = ioUnknown): Integer; overload;

Description

Load the specified page/frame from the last loaded multipage file, including TIFF, GIF, AVI and other video types.
This method uses LoadFromFile to load the file (hence the file name must be provided).
Returns the loaded page index, or -1 if loading failed.

Note:
◼You can abort loading by setting Aborting to true
◼Using Seek() is the same as setting ImageIndex and then reloading the image
◼Seek is called automatically by some methods, such as TImageEnView Buttons
◼You can use OnImageSeek to control image loading behavior

Demo

Demos\InputOutput\IEViewMulti\IEViewMulti.dpr

Example

// load first page
ImageEnView1.IO.Seek(ieioSeekFirst, 'D:\multipage.tiff');

// Which is the same as:
ImageEnView1.IO.Params.ImageIndex := 0;
ImageEnView1.IO.LoadFromFile('D:\multipage.tiff');

// load next page
ImageEnView1.IO.Seek(ieioSeekNext);

// Print all pages of a TIFF
ImageEnView1.IO.LoadFromFile('C:\input.tif');
Printer.Title := 'TIFF Pages';
Printer.BeginDoc();
ImageEnView1.IO.PrintImage();
idx := 0;
while ImageEnView1.IO.Seek( ieioSeekNext ) <> idx do
begin
  ImageEnView1.IO.PrintImage();
  inc(idx);
end;
Printer.EndDoc();

// Save all pages of a TIFF as JPEG
fn := 'D:\TIFF_4pages.tiff';
io := TImageEnIO.Create(nil);
try
  idx := 0;
  io.LoadFromFile( fn );
  Repeat
    io.SaveToFileJpeg('D:\TiffOut_' + idx.ToString + '.jpg');
    inc( idx );
  Until io.Seek( ieioSeekNext, fn ) <> idx;
finally
  io.Free();
end;

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