[Shapelib] Shapelib Digest, Vol 73, Issue 1

[Juan Antonio Pastor]

Hi.

You must write data in the DBF.

Use DBFAddField and: DBFWriteStringAttribute, DBFWriteIntegerAttribute... to
write values into fields.

For example you can write the x and y values (double values):

DBFAddField(hDBF, "X", FTDouble, 15, 15);
DBFAddField(hDBF, "Y", FTDouble, 15, 15);

for(int i=0;i<3;i++) {
  DBFWriteDoubleAttribute(hDBF, i, 0,X[i]);
  DBFWriteDoubleAttribute(hDBF, i, 1,Y[i]);
}

Good luck!


2011/5/31 <shapelib-request at lists.maptools.org>

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> Today's Topics:
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>   1. Point shp file is created with empty dbf. (Rakib Solaimani)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 31 May 2011 01:03:30 +0600
> From: Rakib Solaimani <rakib114 at gmail.com>
> Subject: [Shapelib] Point shp file is created with empty dbf.
> To: shapelib at lists.maptools.org
> Message-ID: <BANLkTinzpKCdF3jNrzPOS4r39Wu6OUuZ7g at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi,
>
> I am new to shapelib. I want to create a simple shp file. I want to draw
> point on specific latitude and longitude. I tried to execute the following
> code which I found by google research.
> I successfully create the shp file and viewed it by ShapeViewer but I found
> my dbf file empty. I am wondering if data in dbf file is created while
> creating new shp file or should it be created
> manually? If so how can I link shp and dbf file. Basically I want to apply
> some rule on dbf file. Can anyone help me please. Here I attach my sample
> code.
>
>
>  #include "stdafx.h"
>  #include <iostream
>  #include <cstdlib
>  #include "shapefil.h"
>  #include <string
>
>  using namespace std;
>
>  int _tmain(int argc, _TCHAR* argv[])
>  {
>     SHPHandle    hSHP;
>     DBFHandle    hDBF;
>     int        nShapeType, Vertices;
>     string  shape_name, Col1;
>     SHPObject    *psObject;
>
>     double X[3], Y[3];
>
>     X[0] = -130;
>     Y[0]= 54;
>
>     X[1] = -120;
>     Y[1]= 30;
>
>     X[2] = -100;
>     Y[2]= 10;
>
>     nShapeType = MultiPoint;
>     Vertices = 3;
>
>
>     hSHP = SHPCreate( "T:\\shapefolder\\test.shp",
> nShapeType);
>
>     hDBF = DBFCreate(T:\\shapefolder\\test.dbf);
>
>     psObject = SHPCreateSimpleObject( nShapeType, Vertices, X, Y, NULL);
>     SHPWriteObject( hSHP, -1, psObject );
>
>
>     DBFClose( hDBF );
>     SHPClose( hSHP );
>
>
>
>     return 0;
>  }
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