VBA - Bentley MAP detach XFM Feature record from graphical element.

Hi Josef,

so the complete workflow is:

1. There are some shape files with the same structure (cadastral map areas).
2. There is XFM project designed based on SHP files structure. (Note: It's possible to import SHP file both with and without XFM project, so it's the reason of this question)
3. You use MapInteroperability tool in Bentley Map to import SHP file
4. You want to convert such file into "mslink style", which includes:
   
   1. To move properties from XFM to database
   2. To establish mslinkg to this newle created record
   3. To drop XFM element into normal MicroStation element

Is it correct?

With regards,

 Jan

Hi Jan,

I use Bentley Map only for import SHP Files, no XFM project.

Command:

>File >Import >Gis Data Types >Imports >New Import >Add File >Import

With regards,

Josef

Attached my MVBA script.

dbXFM2DB.mvba

Hi Josef,

I have had not enough time to check your code (but for the first sight it looks not bad, even if talking about its structure). I did some quick testing and in my opinion this code should work:

Dim ftEnum As FeatureEnumerator
Set ftEnum = locateOp.GetLocatedFeatures

Do While ftEnum.MoveNext
	Dim currentFeature As feature
	Set currentFeature = ftEnum.Current
	
	Dim pureElement As element
	Set pureElement = xft.FeatureMgr.RemoveFeatureLinkages(currentFeature.Geometry)
	
	'Do whatever you need with the new element
	pureElement.Level = ActiveDesignFile.Levels.Find("Default")
	
	pureElement.Rewrite
Loop

I guess you should add it to your process feature class to OnFinished method.

With regards,

 Jan

Hi Jan,
First thank you for your effort!

If I understand you correctly, then I have to work through all selected features and not like my approach through the selected elements.
My basic code is (was):
Dim ee As ElementEnumerator
Set ee = locateOp.GetLocatedElements
ShowPrompt "Elements: " & CStr(locateOp.LocatedElementsCount)
Do While ee.MoveNext

Set ele = ee.Current
ele.Redraw msdDrawingModeHilite
If Not ele.HasAnyDatabaseLinks Then
insertRow ele ' convert xfm data to ODBC record an attach to element
End If
Loop

I must substitute this approach with your code.
Is this correct?

With regards,
Josef R.

Hi Josef,

Unknown said:

f I understand you correctly, then I have to work through all selected features and not like my approach through the selected elements.

My experience with Bentley Map XFT API is not good enough to say if you have to and if it's the only way, but it's the approach that seems to work ;-)

If I understand BM API approach right, the feature is the core, not element (which representing the feature geometry and is not mandatory for some feature types like collections or data). This is in parallel with GIS approach as used in e.g. OGC and presented in many APIs (GeoTools, PostGIS etc.). So if you want to "defeaturize" a particular object, you have to enumerate features, not plain elements. Maybe your approach to work with elements directly can work also, but XFT API is quite high level, so there is a limited freedom to define what exactly will happen automatically and what not.

In my opinion you can use my code to receive a plain MicroStation element (this is not a new element, but the original element representing the feature geometry and now it's "defeaturized") and to add mslink to this element using already existing your code.

Unknown said:

I must substitute this approach with your code.

I assume it should not be a huge effort. Fortunately it's still about the same Locate class and OnFinished method. The only important thing is that you have to drop XFM feature data from an element after you migrate XFM attributes to a database, because after the element is "defeaturized", it's not possible to receive any XFM data anymore. Something like (enumerating features step by step):

1. Read XFM properties from a feature
2. Store the properties in a database (you will receive mslink)
3. Remove XFM linkages from the feature
4. Rewrite the element
5. Add mslink to the element

With regards,

 Jan