SaveToFile does not save groups correctly

VCL TMS Diagram Studio
1

Saving a Diagram to a dgr file using the SaveToFile command saves the objects and groups however the group structure includes reference to the saving application. If the file is opened with a different application using Diagram Studio, the reference in the group structure is not recognised and so ignored.

The Group structure is stored as:

     Members = <
      item
        DControl = dmMyUnit.Obj1
      end
      item
        DControl = dmMyUnit.Obj2
      end>

Where dmMyUnit is the name of the Unit in my application. If I use the simple DiagramDemo app to open the file, the objects are displayed but are not grouped. If I then group them in DiagramDemo and save the file, a new group is added with a members list:

    Members = <
      item
        DControl = __DSOwner___.Obj1
      end
      item
        DControl = __DSOwner___.Obj2
      end>
2

Unfortunately I can't reproduce the issue. With the attached sample project, the groups are saved correctly.

TestDiagramGroupSave.zip (6.6 KB)

3

If you create the objects on the same form as the Diagram resides on then yes, it works. But if the objects are created an a different form it does not.
TestDiagramGroupSave2.zip (25.8 KB)

4

Correct, you can't do that. Always create the diagram objects owned by the same component which owns the diagram.

5

Well, actually I can do it, I have been doing it for months. You are just saying I shouldn't do it if I want to save and load the diagram. :wink:
I must say it sounds like an odd limitation if the only reason is to ensure the prefix is always __DSOwner___ - in which case, why include it at all?

6

It relies on Delphi streaming system, both at runtime and design-time. It's not trivial, and that's how you should use it for now.