[gdal-dev] shapefile; modify field value; write to disk

Fri Aug 2 14:05:17 PDT 2013

Hello,
I'm using OGR via the swig/C# wrapper. Everything works great, except that I cannot get my changed field values saved to disk. I open the .shp for update, calls Feature.SetField and DataSource.SyncToDisk but the changed field value does not appear in the .dbf. No files are being written. How do I get my changed fields to persist back on the disk?

My code:

OSGeo.OGR.DataSource ds = OSGeo.OGR.Ogr.Open(shpFileName, 1);
OSGeo.OGR.Layer lyr = ds.GetLayerByIndex(0);
lyr.ResetReading();
OSGeo.OGR.Feature feat = lyr.GetNextFeature();
while (feat != null)
{
    feat.SetField("Lat", -999);
    feat = lyr.GetNextFeature();
}
ds.SyncToDisk();

-Tom
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