## ole-scribble library

This project contains an example that demonstrates a program written using DUIM which can be used as an embedded OLE part.

This example uses the DUIM-OLE-Server library which is documented in the Functional Developer "OLE, COM, ActiveX and DBMS" reference manual.

This is a simple drawing program, where the user can do arbitrary free-hand line drawing by dragging the mouse. The file scribble.dylan has only a couple of modifications from the original non-OLE version (in the DUIM example scribble in Examples\duim\scribble\): the scribble frame inherits from `<embeddable-frame>` instead of `<simple-frame>`, and a couple of calls to `note-embedded-data-changed` have been inserted. The file run.dylan adds some additional support for use with OLE, as well as initiating execution. The file storage.dylan implements OLE persistent storage for the part.

The program can still be run directly and works the same as the basic scribble example. But it can also be registered as an OLE part.

In order for the part to work when invoked from a container program, all of the libraries used by your part need to either be in the same directory as the part EXE file, or else in a directory which is in the system PATH (not the individual user's PATH on NT). The simplest way to accomplish this is to use the "Project > Build Release" command to create a release directory. If you wish, you can move that directory to any location you want, but you must do so before you attempt to register the part.

To register the part, run the program (from the release directory) from a DOS command prompt like this:

> `ole-scribble.exe /regserver`

This will create the necessary entries in the Windows System Registry and then terminate without creating any windows. The full pathname of the server is recorded, so you must unregister the server before you move or delete it. You can unregister it by doing:

> `ole-scribble.exe /unregserver`

Note that even though the complete pathname of the part is recorded in the registry, some containers (such as Microsoft Write) still require that it be in a directory on the PATH.

Now you should be able to insert the object into any OLE container program. For example, from Microsoft Word or WordPad, pull down the "Insert" menu, select "Object...", and then choose "Dylan DUIM Scribble" from the list in the dialog box (for "Create New"). The Scribble drawing pane will then be embedded in the compound document and you can directly draw in it. Clicking outside of the drawing pane will de-activate it. Double-clicking will activate it again.

In Microsoft Write, select "Insert Object..." from the "Edit" menu. The application will open as a separate top-level window since Write doesn't support in-place activation. When finished drawing, just exit the program and the image will be copied into the Write document.

The object name as displayed in the "Insert Object" dialog comes from the `object-title:` option when making the frame in the function `scribble` in run.dylan.