Specifies the database field that contains the name or filename of the image. It must be the name of a TStringField or TMemoField.
TIEDBBitmap can be used in two ways: ◼Reading images directly from a database blob field, by setting ImageBlobField to a valid field. In this situation FilenameField specifies a display name for the image (and is optional). ◼Reading files stored in a local folder and referenced by a database string field, by setting ImageBlobField to ''. In this case FilenameField should either be a full path to a local file, or a name only with the folder specified by ImagePath
// Display content of a table where images are stored in a blob field fDBBitmap := TIEDBBitmap.create(); fDBBitmap.DataSource := DataSource1; fDBBitmap.ImageBlobField := 'ImageBlob'; ImageEnView1.SetExternalBitmap( fDBBitmap );
// Display content of a table where images are stored in a blob field and name of image is stored in "ImageName" field fDBBitmap := TIEDBBitmap.create(); fDBBitmap.DataSource := DataSource1; fDBBitmap.FilenameField := 'ImageName'; fDBBitmap.ImageBlobField := 'ImageBlob'; ImageEnView1.SetExternalBitmap( fDBBitmap );
// Display content of a table where images are stored in a folder and their path and filename is referenced by the "ImageFilename" field fDBBitmap := TIEDBBitmap.create(); fDBBitmap.DataSource := DataSource1; fDBBitmap.FilenameField := 'ImageFilename'; ImageEnView1.SetExternalBitmap( fDBBitmap );
// Display content of a table where images are stored in a folder named "My Folder" and their filename is referenced by the "ImageName" field fDBBitmap := TIEDBBitmap.create(); fDBBitmap.DataSource := DataSource1; fDBBitmap.ImagePath := 'C:\My Folder\'; fDBBitmap.FilenameField := 'ImageName'; ImageEnView1.SetExternalBitmap( fDBBitmap );
Note: Don't forget to free the object... procedure TMainForm.FormDestroy(Sender: TObject); begin FreeAndNil( fDBBitmap ); end;