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
// 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;