[gdal-dev] Update existing shape file

[wow]

Hi,
   I wanna set new field value to an existing shape file which has been opened with update access, but it doesn't work, my code like this:
  
   OGRFeature* pFeature = pLayer->GetFeature(2); 
  int nIdx = pFeature->GetFieldIndex("Name");
 pFeature->UnsetField(nIdx);
 pFeature->SetField( "Name", "hanJ reiver" );
  
   Anyone give me some advices? 
 ------------------
  To the world you're little, but to a person you're the world.
                                             Chen Xuexia
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