Hi, > > Where do you want to store dbf header information exactly ? In the > > DriverProperties ? > > I'm not going to store the header info. I'm going to detect that the > file exists before saving over it and read the header first. Ah, OK, I see now why you want to know when the dbf is deleted. So, here are a few questions related to your approach : how do you know that the dataset you want to "save" or "save as" still has the same schema as the original dbf ? - if you load a.shp, then add a column to the schema, then "save dataset" - if you load a.shp, then edit a user attribute from Integer to String then "save dataset"
Also here is a brief sequence to understand how "save dataset" and "save layer as" work (IMHO works well, but can be a bit confusing if user is not perfectly aware about what he does) - load a.shp, - save layer b as a.shp : a.shp is replaced by b data - modify a layer - save a layer dataset : a.shp is replaced again by a data (note that if a has not been modified, a.shp still contains b data) Michaël > > Larry > > 2010/6/22 Michaël Michaud <michael.mich...@free.fr > <mailto:michael.mich...@free.fr>> > > Larry Becker a écrit : > > Hi Michaël, > > > > The approach I'm taking to reach the same goal is quite different. > > If it works, the modification will only be in one method: > > ShapefileWriter.writeDbf(FeatureCollection featureCollection, String > > fname). What I intend is to read fname's dbf header using > > DbfFile(String file), if the file exists, and use the DbfFieldDefs > > contained within. At this point I don't know when the "Replace > > existing file" dialog occurs, and if it deletes it before > writeDbf is > > called. Do you see any other pitfalls of this approach? > Yes, the shapefile only solution will be more simple to implement. > I did > not understand why you worry about when "Replace existing file" > occurs. > Where do you want to store dbf header information exactly ? In the > DriverProperties ? > > Michaël > > > > regards, > > Larry > > > > 2010/6/22 Michaël Michaud <michael.mich...@free.fr > <mailto:michael.mich...@free.fr> > > <mailto:michael.mich...@free.fr <mailto:michael.mich...@free.fr>>> > > > > Hi Larry, > > > > As you go on working about this feature, I just want to let you > > know the > > work I did in 2004 to add new attribute types in JUMP > > You'll find a patch and a complete doc here : > > http://michael.michaud.free.fr/jump/plugins/plugins.html (hoping > > you can > > read french) > > My concern was exactly "not to change input schema". I > abandonned it > > because my concern changed, and because I could not update > every piece > > of JUMP code that should have been updated to take new > attribute > > types > > into account (especially database-access, but not only). > > > > Michaël > > > > Larry Becker a écrit : > > > I agree with Michaël. This isn't really a bug, but it is > annoying to > > > have your DBF header modified. I have already spent some > time > > trying > > > to implement a "don't modify the DBF header" approach to > > > SaveSelectedDatasets, but it seems to be a difficult > > modification and > > > I haven't gotten very far on it yet. The idea is to read the > > existing > > > header and associate with the attributes being saved (by name) > > > whenever possible, and convert using custom format specifiers. > > > > > > I'll keep working on it because this is an important > feature since > > > shape files are OJ's primary dataset. > > > > > > regards, > > > Larry > > > > > > 2010/6/22 Michaël Michaud <michael.mich...@free.fr > <mailto:michael.mich...@free.fr> > > <mailto:michael.mich...@free.fr > <mailto:michael.mich...@free.fr>> > > > <mailto:michael.mich...@free.fr > <mailto:michael.mich...@free.fr> <mailto:michael.mich...@free.fr > <mailto:michael.mich...@free.fr>>>> > > > > > > Hi, > > > > > > Would be interesting to have more details. > > > Different bytes surrounded in your pdf file is related > to a > > recent > > > discussion with Larry on the forum. > > > > > > OpenJUMP does not support length/decimal count in > attribute > > > definition. > > > It exports : > > > integers to 11 bytes long dbf field (thanks to Larry > who reduced > > > it from > > > 16 to 11) > > > doubles to 33 bytes long dbf field including 16 decimal > > digits (hence > > > the 21 10 bytes from OJ dbf instead of 0c 03 which > means 12 > > bytes > > > including 3 decimal digit) > > > > > > It is not easy to workaround this, but it can not > considered > > as a bug. > > > OpenOffice.org calc can read these files very well and > write > > the field > > > length this way : > > > before : > > > poiShapeID,N,4,0 poiTypID,N,4,0 poiName,C,50 > > > > > > after > > > poiShapeID,N,11,0 poiTypID,N,11,0 > poiName,C,32 > > > > > > > > > Notice that the character field has also been changed > because > > > there were > > > no field with more than 32 characters in the dataset > > > > > > If OpenJUMP dbf cannot be uploaded to access with > Borland-BDE, I > > > suppose > > > there is another problem. > > > I do not understand what is the matter with the length of > > file names. > > > > > > my 2 cents > > > > > > Michaël > > > > > > > > > > > > Stefan Steiniger a écrit : > > > > Hei All/Developers, > > > > > > > > I got an email from Bernd describing the following > problem > > with > > > > OpenJUMP writing shape/dbf files. [my translation]: > > > > > > > > ============= > > > > It seem like the dbf headers written by OpenJUMP are not > > conform to > > > > the DBASE III standard. > > > > > > > > Working with Borland-BDE dbase-tests failed and an Error > > 8961 is > > > > returned. The BDE was/is actually used to include > the dbf > > files > > > into a > > > > MS Access database - in particular as the BDE supports > > long file > > > names. > > > > > > > > With short file names the BDE is not used and hence > there > > are no > > > > problems, also other programs don't seem to test for the > > correct dbf > > > > header. but... short filenames are not so > comfortable, etc. > > > > > > > > Attached is a file (hexdump_dbf.pdf) that shows the > > differences > > > before > > > > and after OJ writes the shape file - and the changes in > > the header. > > > > > > > > The saved file contains several spaces and quite a > bit of > > digits > > > after > > > > the comma [sound very similar to what Michael looked > into > > lately?] - > > > > hence the file size is bigger too. > > > > > > > > ============== > > > > > > > > Anyone who is interested in fixing that or has any > > suggestions? > > > > > > > > the dbase standard description is also attached > > > > > > > > mhm.. I actually would not be surprised when the > original > > shape file > > > > writer is from the 90ies > > > > > > > > stefan > > > > > > > > -------- Original Message -------- > > > > Subject: OpenJump, Shape und Dbase > > > > Date: Thu, 17 Jun 2010 13:41:52 +0200 > > > > From: <bernd.we...@erfurt.de > <mailto:bernd.we...@erfurt.de> > > <mailto:bernd.we...@erfurt.de > <mailto:bernd.we...@erfurt.de>> <mailto:bernd.we...@erfurt.de > <mailto:bernd.we...@erfurt.de> > > <mailto:bernd.we...@erfurt.de <mailto:bernd.we...@erfurt.de>>>> > > > > To: <sst...@geo.uzh.ch > <mailto:sst...@geo.uzh.ch> <mailto:sst...@geo.uzh.ch > <mailto:sst...@geo.uzh.ch>> > > <mailto:sst...@geo.uzh.ch <mailto:sst...@geo.uzh.ch> > <mailto:sst...@geo.uzh.ch <mailto:sst...@geo.uzh.ch>>>> > > > > > > > > > > > > > > > > Hallo Stefan, > > > > > > > > Im speziellen Fall geht es um die numerischen > Datenfelder (Typ > > > double) > > > > aus den DBF-Dateien, die nicht ganz den > Spezifikationen von > > > DBASE III > > > > genügen. Mitbekommen habe ich das bei Einsatz der > Borland-BDE, > > > die den > > > > Header offensichtlich genau prüft und einen Fehler 8961 > > meldet. > > > > > > > > Viele Programme scheint die Veränderung des Headers > nicht zu > > > stören, die > > > > BDE schon. Zur Erinnerung: Ich habe die BDE ausprobiert, > > um die > > > DBFs aus > > > > den SHAPES in eine MS-ACCESS-Datenbank einzubinden, weil > > die BDE > > > auch > > > > lange Dateinamen unterstützt. ACCESS deswegen, weil ich > > dort mit > > > > einfachen Abfragen aus Sachdatenbanken (Informix) > die Geodaten > > > ergänzen > > > > und aufwerten kann. > > > > > > > > Mit kurzen Dateinamen brauche ich die BDE nicht, > habe keine > > > Probleme mit > > > > ACCESS, aber GIS mit kurzen Dateinamen sieht recht > komisch > > aus. > > > > > > > > Hier nun meine Forschungsergebnisse: > > > > > > > > 1. Daten im Originalzustand in File hexdump_ok.pdf > > > > hier ist nach den Datentypen N=Numerical zu > erkennen, daß die > > > Feldgrößen > > > > sich in typischen Werten bewegen. > > > > 2. Daten im File hexdump_err.pdf > > > > Nach "Speichern unter …" im Openjump sind diese > Eintragungen > > > deutlich > > > > anders und die numerischen Werte haben führende > > Leerzeichen und ganz > > > > viele Nachkommastellen. > > > > > > > > Dieses Verhalten erklärt auch, warum Fremddaten nach > > Bearbeitung > > > mit OJ > > > > mehr Speicherplatz brauchen als im Original. > > > > > > > > Die DBASE-Spezifikationen habe ich Dir als 3. Datei > angehängt. > > > > > > > > In der Hoffnung, daß Du jemanden findest, der das > Problem > > lösen > > > kann, > > > > verbleibe ich mit vielen Grüßen aus dem sonnigen > Thüringen. > > > > > > > > Bernd Wehle > > > > Tiefbau- und Verkehrsamt Erfurt > > > > 99085 Erfurt, Steinplatz1 > > > > Tel.: 0361 655 3108 > > > > Fax: 0361 655 3178 > > > > e-Mail: ___bernd.we...@erfurt.de_ > > <mailto:bernd.we...@erfurt.de <mailto:bernd.we...@erfurt.de> > <mailto:bernd.we...@erfurt.de <mailto:bernd.we...@erfurt.de>> > > > <mailto:bernd.we...@erfurt.de > <mailto:bernd.we...@erfurt.de> <mailto:bernd.we...@erfurt.de > <mailto:bernd.we...@erfurt.de>>>> > > > > > > > > <<hexdump_ok.pdf>> <<hexdump_err.pdf>> > > <<dbase_strukturen.pdf>> > > > > > > > > > > > > > > ------------------------------------------------------------------------ > > > > > > > > > > > > > > > ------------------------------------------------------------------------------ > > > > ThinkGeek and WIRED's GeekDad team up for the Ultimate > > > > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > > > > lucky parental unit. See the prize list and enter > to win: > > > > http://p.sf.net/sfu/thinkgeek-promo > > > > > > > > > > ------------------------------------------------------------------------ > > > > > > > > _______________________________________________ > > > > Jump-pilot-devel mailing list > > > > Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net> > > <mailto:Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net>> > > > <mailto:Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net> > > <mailto:Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net>>> > > > > > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > > > > > > > > > > > > > ------------------------------------------------------------------------------ > > > ThinkGeek and WIRED's GeekDad team up for the Ultimate > > > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > > > lucky parental unit. See the prize list and enter to win: > > > http://p.sf.net/sfu/thinkgeek-promo > > > _______________________________________________ > > > Jump-pilot-devel mailing list > > > Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net> > > <mailto:Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net>> > > > <mailto:Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net> > > <mailto:Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net>>> > > > > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > > > > > > > > ------------------------------------------------------------------------ > > > > > > > > > > ------------------------------------------------------------------------------ > > > ThinkGeek and WIRED's GeekDad team up for the Ultimate > > > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > > > lucky parental unit. See the prize list and enter to win: > > > http://p.sf.net/sfu/thinkgeek-promo > > > > > > ------------------------------------------------------------------------ > > > > > > _______________________________________________ > > > Jump-pilot-devel mailing list > > > Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net> > > <mailto:Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net>> > > > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > > > > > > > ------------------------------------------------------------------------------ > > ThinkGeek and WIRED's GeekDad team up for the Ultimate > > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > > lucky parental unit. See the prize list and enter to win: > > http://p.sf.net/sfu/thinkgeek-promo > > _______________________________________________ > > Jump-pilot-devel mailing list > > Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net> > > <mailto:Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net>> > > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > > > ------------------------------------------------------------------------ > > > > > > ------------------------------------------------------------------------------ > > ThinkGeek and WIRED's GeekDad team up for the Ultimate > > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > > lucky parental unit. See the prize list and enter to win: > > http://p.sf.net/sfu/thinkgeek-promo > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > Jump-pilot-devel mailing list > > Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net> > > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > > ------------------------------------------------------------------------------ > ThinkGeek and WIRED's GeekDad team up for the Ultimate > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > lucky parental unit. See the prize list and enter to win: > http://p.sf.net/sfu/thinkgeek-promo > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > <mailto:Jump-pilot-devel@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------------ > ThinkGeek and WIRED's GeekDad team up for the Ultimate > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > lucky parental unit. See the prize list and enter to win: > http://p.sf.net/sfu/thinkgeek-promo > ------------------------------------------------------------------------ > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > ------------------------------------------------------------------------------ ThinkGeek and WIRED's GeekDad team up for the Ultimate GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the lucky parental unit. See the prize list and enter to win: http://p.sf.net/sfu/thinkgeek-promo _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
