crash when creating an empty shapefile and insert a new feature into it

[mhugent@…]

Hi, 
 
I'm not sure if this is a bug in OGR or in my program. What i try to do is to 
create an empty shapefile and later to open this shapefile and insert features 
into it. When i try to add the feature, a crash happens. Also i noticed that a 
field, which i created on the empty shapefile is not recognised when the empty 
layer is opened. Below is my source code and the debugger backtrace after the 
crash. A .tgz of the created files (.shp,.dbf,etc.) befor adding a feature is 
on ftp://ftp.geo.unizh.ch/pub/mhugent/newlayertest.tgz 
 
thanks, 
Marco 
 
 
//create an empty layer and add a field to it 
OGRwkbGeometryType geomtype=(OGRwkbGeometryType)((int)vectortype); 
    QString mOutputFormat = "ESRI Shapefile"; 
    QString mOutputFileName = uri; 
#ifdef WIN32  
    QString 
outname=mOutputFileName.mid(mOutputFileName.findRev("\\")+1,mOutputFileName.length()); 
#else 
    QString 
outname=mOutputFileName.mid(mOutputFileName.findRev("/")+1,mOutputFileName.length()); 
#endif 
    OGRSFDriverRegistrar* driverregist = OGRSFDriverRegistrar::GetRegistrar(); 
     
    if(driverregist==0) 
    { 
	return false; 
    } 
    OGRSFDriver* driver = driverregist->GetDriverByName(mOutputFormat); 
    if(driver==0) 
    { 
	return false; 
    } 
    OGRDataSource* datasource = driver->CreateDataSource(mOutputFileName,NULL); 
    if(datasource==0) 
    { 
	return false; 
    } 
 
    OGRSpatialReference reference; 
    OGRLayer* layer = datasource->CreateLayer(outname.latin1
(),&reference,geomtype,NULL); 
    if(layer==0) 
    { 
	return false; 
    } 
 
    OGRFieldDefn fielddef("dummy",OFTReal); 
    fielddef.SetWidth(1); 
    fielddef.SetPrecision(1); 
    if(layer->CreateField(&fielddef,FALSE)!=OGRERR_NONE) 
    { 
	return false; 
    } 
 
the debugger output when inserting a new feature afterwards: 
 
Program received signal SIGSEGV, Segmentation fault. 
[Switching to Thread 1091298272 (LWP 25403)] 
0x40a70218 in DBFGetRecordCount () from /usr/local/lib/libgdal.so.1 
(gdb) backtrace 
#0  0x40a70218 in DBFGetRecordCount () from /usr/local/lib/libgdal.so.1 
#1  0x40b0992f in SHPWriteOGRFeature () from /usr/local/lib/libgdal.so.1 
#2  0x40af4936 in OGRShapeLayer::CreateFeature () 
from /usr/local/lib/libgdal.so.1 
#3  0x41923027 in QgsShapeFileProvider::commitFeature (this=0x85a0668, 
f=0x85f7cb0) at qgsshapefileprovider.cpp:820 
#4  0x41922e14 in QgsShapeFileProvider::commitChanges (this=Variable "this" is 
not available. 
) at stl_list.h:167