TIEDBMultiBitmap.Read

Declaration

function Read(): Boolean; overload;
function Read(aBlobField: TBlobField; FileType: TIOFileType = ioUnknown; IOParams: TIOMultiParams = nil): Boolean; overload;

Description

Load an image from a blob field, file or stream (including all its frames) of any format supported by the TImageEnMIO class.
The Read(); overload reads the image at the current database position using the properties of DataSource, ImageBlobField and/or FilenameField.
When reading from a blob or stream you can optionally specify the Format. If ioUnknown is specified, the format is detected automatically by reading the image header.
You can optionally pass an TIOMultiParams object for the I/O parameters of the file.
Returns False on failure.

Note: Do NOT use this method when Mode = dmAllRecords

Examples

// Extract an image from a database and save it
MBMP := TIEDBMultiBitmap.Create();
MBMP.Read( MyTableImageBlob );
MBMP.Write( 'D:\MyBlobImage.jpeg' );
MBMP.Free();

// Reduce the size of an image in the database
MBMP := TIEDBMultiBitmap.Create();
MBMP.Read( MyTableImageBlobField );
MBMP.Resample( 800, 600, rfLanczos3, True);
MBMP.JpegQuality := 75;
MBMP.Write( MyTableImageBlobField, ioJPEG );
MBMP.Free();

TIEDBMultiBitmap.Read