ImageEn, unit imageenio

TImageEnIO.ParamsFromFile

TImageEnIO.ParamsFromFile


Declaration

                                                                          function ParamsFromFile(const FileName: WideString; bUseExtension: Boolean = False): Boolean; overload;
function ParamsFromFile(const FileName: WideString; Format: TIOFileType): Boolean; overload;


Description

Reads the image properties and meta-data without loading the image (and without changing the current image).
Result is false if a loading error is encountered due to a corrupt or unknown image format.
ParamsFromFile is the same as calling LoadFromFile but without retrieving the image.

Parameter Description
FileName File name with full path
Format Image format of the file. If ioUnknown is specified then the file content is analyzed to determine the format
bUseExtension If true, the file format is based on the extension of the file, e.g. image.jpeg will be processed as ioJPEG format

Note: You do NOT need to call ParamsFromFile if you are already loading the image, e.g using LoadFromFile


Examples

// Load the parameters of an image (which may be a BMP file, but we will examine the content to be sure)
ImageEnView1.IO.ParamsFromFile( 'C:\alfa.bmp' );
Label1.Caption := 'alfa.bmp has ' + inttostr(ImageEnView1.IO.Params.BitsPerSample) + ' bits per sample';

// Load the parameters of a BMP
ImageEnView1.IO.ParamsFromFile( 'C:\alfa.bmp', ioBMP );
Label1.Caption := 'alfa.bmp has ' + inttostr(ImageEnView1.IO.Params.BitsPerSample) + ' bits per sample';

// Load the parameters of a file. It will be assumed to a BMP because of the file extension
ImageEnView1.IO.ParamsFromFile( 'C:\alfa.bmp', True );
Label1.Caption := 'alfa.bmp has ' + inttostr(ImageEnView1.IO.Params.BitsPerSample) + ' bits per sample';

// Show the EXIF date of an image
IO := TImageEnIO.Create( nil );
try
  IO.ParamsFromFile( sFilename );
  ShowMessage( DateTimeToStr(( IO.IOParams.EXIF_DateTimeOriginal2 ));
finally
  IO.Free;
end;