Jhon Chin,
> Hi, everybody:
>
> add one more question :
>
> the field name can be read 10 ascii characters, the last characters would
> be trimmed,
Not necessarily 10 ascii characters, but 10 bytes. The number of characters
that can fit on 10 bytes depends on the encoding. 1 ASCII character = 1 byte.
But for non ASCII characters such as Chinese characters, one character fits on
several bytes.
> is there anyone encounter this problem?
Yes, everybody ! This is a limitation of the > 30 year old DBF format.
I've tried the following Python script that creates a shapefile with the CP936
encoding.
{{{
# -*- coding: utf-8 -*-
from osgeo import ogr
ds = ogr.GetDriverByName('ESRI Shapefile').CreateDataSource('test_cp936.dbf')
lyr = ds.CreateLayer('test_cp936', options = ['ENCODING=CP936'])
lyr.CreateField(ogr.FieldDefn("归一化植被指数",ogr.OFTInteger))
}}}
It emits a warning about truncation since the field name cannot fit on 10 bytes
once recoded in CP936.
Here's the result:
$ ogrinfo cp936.dbf -al
INFO: Open of `cp936.dbf'
using driver `ESRI Shapefile' successful.
Layer name: cp936
Metadata:
DBF_DATE_LAST_UPDATE=2015-10-12
Geometry: Line String
Feature Count: 0
Extent: (0.000000, 0.000000) - (0.000000, 0.000000)
Layer SRS WKT:
(unknown)
归一化植被: Integer (9.0)
So the last 2 characters are lost.
>
> any help would be appreciated!
>
> Jhon Chen
>
> On Mon, Oct 12, 2015 at 3:43 PM, Jhon Chin <giantchen2...@gmail.com> wrote:
> > Hi, everybody:
> >
> > I'm now trying to write polygonized result into an esri shapefile, and I
> > tried
> >
> > to add some field to the attribute table in the shapefile. But it
> > corrupted
> >
> > when i was trying to create an *ogrfielddefn* instance.The code goes
> >
> > like this:
> > OGRFieldDefn oField("归一化植被指数",OFTInteger);
> > if(poLayer->CreateField(&oField) != OGRERR_NONE)
> > {
> >
> > printf("create 归一化植被指数 failed!");
> > exit(1);
> >
> > }
--
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