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In the previous chapter, you learned how to extract all the images from a page, but what if you want to pick one specific image programmatically An image is a stored in a stream object. Each stream consists of a dictionary followed by zero or more bytes bracketed between the keywords stream and endstream (see table 13.2). The entries of the stream dictionary are filled in by iText. In the case of images, you ll have at least entries for the width and the height of the image, and a value defining the compression filter, but there s no reference to the original filename. The original bits and bytes of the image may have been changed completely. One of the mailing-list subscribers wanted to solve the problem of retrieving specific images by adding an extra entry to the image stream dictionary. Listing 16.1 was written in answer to his question.

Image img = Image.getInstance(RESOURCE); img.scaleAbsolute(400, 300); img.setAbsolutePosition(0, 0); PdfImage stream = new PdfImage(img, "", null); stream.put(new PdfName("ITXT_SpecialId"), new PdfName("123456789")); PdfIndirectObject ref = writer.addToBody(stream); img.setDirectReference(ref.getIndirectReference()); document.add(img);

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PDO::ERRMODE_EXCEPTION); } catch (PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } } // Return the database handler return self::$_mHandler; } } > 3. Add the Close method to the DatabaseHandler class. This method will be called to close the database connection: // Clear the PDO class instance public static function Close() { self::$_mHandler = null; } 4. Add the Prepare method to DatabaseHandler. This method uses PDO s prepare method, and you ll use it for preparing SQL statements for execution. // Wrapper method for PDO::prepare public static function Prepare($queryString) { // Execute code catching potential exceptions try { // Get the database handler and prepare the query $database_handler = self::GetHandler(); $statement_handler = $database_handler->prepare($queryString); // Return the prepared statement return $statement_handler; } catch (PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } }

You create an instance of the high-level Image object, and set some properties, as described in chapter 2. You use this Image object to create a low-level PdfImage object. This object extends the PdfStream class. With the second parameter, you can pass a name for the image; the third parameter can be used for the reference to a mask image.

In a pivot table layout, subtotals for the Row fields can appear above or below the items that they subtotal. Currently, the Service field in your pivot table has its subtotals displayed above its items. You ll change one of the pivot table settings to display all the subtotals again and select a position in which to display the row subtotals: 1. Select a cell in the pivot table. 2. On the Ribbon, under the PivotTable Tools tab, click the Design tab. 3. At the far left, in the Layout group, click the Subtotals command. 4. Click Show All Subtotals at Top of Group.

PdfStream extends PdfDictionary. Just like with plain dictionaries, you can add key-

5. Add the Execute method to DatabaseHandler. This method uses the PDOStatement::execute method to run queries that don t return records (INSERT, DELETE, or UPDATE queries): // Wrapper method for PDOStatement::execute public static function Execute($statementHandler, $params = null) { try { // Try to execute the query $statementHandler->execute($params); } catch(PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } } 6. Add the GetAll function, which is the wrapper method for fetchAll. You ll call this function for retrieving a complete result set from a SELECT query. // Wrapper method for PDOStatement::fetchAll public static function GetAll($statementHandler, $params = null, $fetchStyle = PDO::FETCH_ASSOC) { // Initialize the return value to null $result = null; // Try executing the prepared statement received as parameter try { self::Execute($statementHandler, $params); $result = $statementHandler->fetchAll($fetchStyle); } catch(PDOException $e) { // Close the database handler and trigger an error self::Close(); trigger_error($e->getMessage(), E_USER_ERROR); } // Return the query results return $result; }

value pairs. In this case, you choose a name for the key using the prefix reserved for iText (ITXT): ITXT_SpecialId. The value of the entry is also a name of your choice, in this case /123456789.

You add the stream object to the body of the file that is written by the PdfWriter object. The addToBody() method returns a PdfIndirectObject. Because it s the first element that s added to the writer in this example, the reference of this object will be 1 0 R.