One of the main features of the new 4D Write Pro object is the ability to import and convert existing 4D Write documents. This will allow you to migrate applications that currently rely on the 4D Write plug-in.

Compatibility notes:

• Only 4D Write documents of the last generation ("4D Write v7") are supported.
• Copying-pasting from a 4D Write document to a 4D Write Pro area is not supported for the moment. A 4D Write document can only be imported using 4D Write Pro language commands.
• Carriage returns (CR) in formulas behave differently in 4D Write and 4D Write Pro. In 4D Write, they are always interpreted as paragraph breaks, whereas in 4D Write Pro they are interpreted as line breaks by default. To maintain CR in formulas as paragraph breaks in imported 4D Write documents, after conversion use:
  
   WP SET ATTRIBUTES(wp;wk break paragraphs in formulas;wk true)
  
  For more information, see Managing formulas.

4D Write Pro objects offer two ways to import 4D Write documents:

• For 4D Write files stored on disk, you use the WP Import document command,
• For 4D Write areas stored in BLOB fields, you use the WP New command.

For more information, please refer to the description of these commands.

To facilitate your migration from the 4D Write plug-in to 4D Write Pro, we want to support as many 4D Write features as possible in 4D Write Pro objects.

This paragraph lists the 4D Write plug-in properties that are currently recovered in a 4D Write Pro area after an import using the WP Import document or WP New commands.

Note however that a few differences can be seen, which are not considered as bugs. This is due, for example, to the default font used in 4D Write Pro for bullets, or small conversions in the Underline type.

Note: The system separator (as returned by GET SYSTEM FORMAT) is used as decimal separator for decimal tabs. You can change this parameter using the WP SET ATTRIBUTES command. 

Compatibility notes: 

• Picture display modes are automatically imported as of 4D Write Pro v19 R2, using WP Import document. You can restore the previous behavior (all images are scaled to fit) using the importDisplayMode attribute. 
• On Windows, images having the Mac OS PICT format are imported but cannot be rendered in 4D Write Pro. If you import a document containing images of this type, you need to convert them to another format. Support of PICT format has been removed since 4D v18 and can no longer be used.

• (*) Starting with 4D v16 R4, URL links are converted to editable attributes. For more information, please refer to Link commands.
• (**) You need to adapt parameters received within the called methods:
  

  Parameters	4D Write plug-in	4D Write Pro
  $1	Longint - 4D Write area reference	Text - 4D Write Pro area name
  $2	Text - Link label	Object - Link description: .method - Link's method name. Must be be allowed with the SET ALLOWED METHODS command. .parameter - User parameter value passed to the method (if used) .range - Range of the link's label. See Range handling commands
  $3	Longint - User parameter (methodRef)	-

*Use the WP SET ATTRIBUTES command with the wk break paragraphs in formulas attribute to transform CR returned by formulas into paragraph breaks in the imported document (line breaks by default). (See Managing formulas) 

**can be imported as text between ##htmlBegin## and ##htmlEnd## tags if you use the wk import html expressions as text constant.