[Shapelib] Re: Adding a polygon to a shapefile

Joaquin Perez Valera joaquinperezvalera at gmail.com
Wed Feb 20 12:33:02 EST 2008


Hi Tom

Now I'm not in home. After I'll try to compile your version of my code.
I don't understand what means of what does this line of text

int _tmain(int argc, _TCHAR* argv[])

I don't know. Well I know part of this code is the name of the shapefile.
But the other parameters?

Well, thanks

Cheers, Joaquin


2008/2/20, shapelib-request at lists.maptools.org <
shapelib-request at lists.maptools.org>:
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>
>   1. Re: Re: Adding a polygon to a shapefile (Tom Kazimiers)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 20 Feb 2008 11:03:23 +0100
> From: Tom Kazimiers <2voodoo at gmx.de>
> Subject: Re: [Shapelib] Re: Adding a polygon to a shapefile
> To: Shapelib Development <shapelib at lists.maptools.org>
> Message-ID: <47BBFAEA.8060004 at gmx.de>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Joaquin,
>
> if I make the following to changes to your code it works for me:
> 1. include the C++ version of string (insteat of "string.h" include
> <string>)
> Without this getline could not be found for me.
> 2. Vertices is not initialized - like said before, make sure everything
> is set up correctly - If you put "Vertices = 7;" in everything is ok.
>
> In particular my version of you code is:
>
> [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[7], Y[7], X1, Y1;
>
>    X[0] = 220764;
>    Y[0]= 2343777;
>    X[1] = 220610;
>    Y[1]= 2343627;
>    X[2] = 220818;
>    Y[2]= 2343477;
>    X[3] = 221109;
>    Y[3]= 2343777;
>    X[4] = 230504;
>    Y[4]= 2343627;
>    X[5] = 221102;
>    Y[5]= 2343477;
>    X[6] = X[0];
>    Y[6] = Y[0];
>
>    X1 = 220764;
>    Y1 = 2343777;
>
>     cout << "Name of the new Shapefile" << endl;
>    getline(cin,shape_name);
>
>    cout << "The shapefile is: " << shape_name << endl;
>
>    nShapeType = 5;
>    Vertices = 7;
>
>
>    hSHP = SHPCreate( shape_name.c_str(),nShapeType);
>
>    hDBF = DBFCreate( shape_name.c_str());
>
>    psObject = SHPCreateSimpleObject( nShapeType, Vertices, X, Y, NULL);
>    SHPWriteObject( hSHP, -1, psObject );
>
>
>    DBFClose( hDBF );
>    SHPClose( hSHP );
>
>
>
>    return 0;
> }
> [/CODE]
>
>
> Cheers,
> Tom
>
> Joaquin Perez Valera schrieb:
> > Hi
> >
> > I've been trying with CreateSimpleObject but i have not good results.
> >
> > I wrote the simple code:
> >
> > [CODE]
> > #include <iostream>
> > #include <cstdlib>
> > #include "shapefil.h"
> > #include "string.h"
> >
> >
> > using namespace std;
> > int main()
> >
> > {
> >     SHPHandle    hSHP;
> >     DBFHandle    hDBF;
> >     int        nShapeType, Vertices;
> >     string  shape_name, Col1;
> >     SHPObject    *psObject;
> >
> >     double X[7], Y[7], X1, Y1;
> >
> >     X[0] = 220764;
> >     Y[0]= 2343777;
> >     X[1] = 220610;
> >     Y[1]= 2343627;
> >     X[2] = 220818;
> >     Y[2]= 2343477;
> >     X[3] = 221109;
> >     Y[3]= 2343777;
> >     X[4] = 230504;
> >     Y[4]= 2343627;
> >     X[5] = 221102;
> >     Y[5]= 2343477;
> >     X[6] = X[0];
> >     Y[6] = Y[0];
> >
> >     X1 = 220764;
> >     Y1 = 2343777;
> >
> >      cout << "Name of the new Shapefile" << endl;
> >     getline(cin,shape_name);
> >
> >     cout << "The shapefile is: " << shape_name << endl;
> >
> >     nShapeType = 5;
> >
> >
> >
> >     hSHP = SHPCreate( shape_name.c_str(),nShapeType);
> >
> >     hDBF = DBFCreate( shape_name.c_str());
> >
> >     psObject = SHPCreateSimpleObject( nShapeType, Vertices, X, Y, NULL);
> >     SHPWriteObject( hSHP, -1, psObject );
> >
> >
> >     DBFClose( hDBF );
> >     SHPClose( hSHP );
> >
> >
> >
> >     return 0;
> > }
> > [/CODE]
> >
> > And when I runs it I have the same message error and the shapefile is
> > corrupt when I want to open it with ArcCatalog.
> >
> > Well
> >
> > See you and thanks.
> >
> >
> >
> > 2008/2/18, shapelib-request at lists.maptools.org
> > <mailto:shapelib-request at lists.maptools.org>
> > <shapelib-request at lists.maptools.org
> > <mailto:shapelib-request at lists.maptools.org>>:
> >
> >     Send Shapelib mailing list submissions to
> >             shapelib at lists.maptools.org
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> >     or, via email, send a message with subject or body 'help' to
> >             shapelib-request at lists.maptools.org
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> >
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> >             shapelib-owner at lists.maptools.org
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> >
> >     When replying, please edit your Subject line so it is more specific
> >     than "Re: Contents of Shapelib digest..."
> >
> >
> >     Today's Topics:
> >
> >        1. Adding a polygon to a shapefile (Joaquin Perez Valera)
> >        2. Re: Adding a polygon to a shapefile (Tom Kazimiers)
> >        3. Re: Adding a polygon to a shapefile (Tom Kazimiers)
> >
> >
> >
> ----------------------------------------------------------------------
> >
> >     Message: 1
> >     Date: Sun, 17 Feb 2008 16:30:21 -0600
> >     From: "Joaquin Perez Valera" <joaquinperezvalera at gmail.com
> >     <mailto:joaquinperezvalera at gmail.com>>
> >     Subject: [Shapelib] Adding a polygon to a shapefile
> >     To: shapelib at lists.maptools.org <mailto:shapelib at lists.maptools.org>
> >     Message-ID:
> >             <79a4e0710802171430y7dbad9c0p34780e668e3546ff at mail.gmail.com
> >     <mailto:79a4e0710802171430y7dbad9c0p34780e668e3546ff at mail.gmail.com
> >>
> >     Content-Type: text/plain; charset="iso-8859-1"
> >
> >     Hi
> >
> >     I can create shapefiles and they are valid when I work with
> >     ArcCatalog. But
> >     the shapefiles are empty.
> >
> >     Now I'm trying to add objects to my shapefile. I want to add
> polygons.
> >
> >     First I create a shapefile and a dbf file with an a simple column.
> >     Then it
> >     becomes valid for ArcCatalog.
> >     Then I create 2 arrays of 7 elements X[7] and Y[7], and give a
> >     valor to each
> >     element. Seven elements because
> >     I want to draw a polygon of six vertices.
> >
> >     After it I use psObject = SHPCreateObject to create my polygon and
> >     after
> >     SHPWriteObject( hSHP, -1, psObject ); to write it
> >     in my shapefile.
> >
> >     It's obviously that I'm doing something wrong.
> >     But I don't know what.
> >
> >     Can somebody help me or say me what I'm doing wrong?
> >
> >     Thanks.
> >
> >
> >     [CODE]
> >     #include <iostream>
> >     #include <cstdlib>
> >     #include "shapefil.h"
> >     #include "string.h"
> >
> >
> >     using namespace std;
> >     int main()
> >
> >     {
> >         SHPHandle    hSHP;
> >         DBFHandle    hDBF;
> >         int        nShapeType,   nWidth = 3, vertexcount, *panParts,
> >     ShapeId,
> >     nParts;
> >
> >         string  shape_name, Col1;
> >         Col1= "Column";
> >
> >         SHPObject    *psObject;
> >
> >
> >         cout << "Name of the new Shapefile" << endl;
> >         getline(cin,shape_name);
> >
> >         cout << "The shapefile is: " << shape_name << endl;
> >
> >         //Here I define the type of shapefile, the 5 is for a polygon.
> >         nShapeType=5;
> >
> >
> >         hSHP = SHPCreate( shape_name.c_str(), nShapeType );
> >
> >         hDBF = DBFCreate( shape_name.c_str() );
> >
> >
> >         cout <<"The shape has "<< DBFGetFieldCount( hDBF ) <<"
> >     columns" << endl;
> >
> >
> >
> >         DBFAddField( hDBF, Col1.c_str(), FTInteger,   nWidth, 0 );
> >         cout <<"Now the shape has " << DBFGetFieldCount( hDBF ) << "
> >     columns";
> >
> >         //At this point the shape is valid for ArcView
> >
> >         //Here I define an array of seven elements and I'll give a
> >     coordinate
> >     for each element
> >
> >         double X[7], Y[7];
> >         X[0] = 220764;
> >         Y[0]= 2343777;
> >         X[1] = 220610;
> >         Y[1]= 2343627;
> >         X[2] = 220818;
> >         Y[2]= 2343477;
> >         X[3] = 221109;
> >         Y[3]= 2343777;
> >         X[4] = 230504;
> >         Y[4]= 2343627;
> >         X[5] = 221102;
> >         Y[5]= 2343477;
> >         X[6] = X[0];
> >         Y[6] = Y[0];
> >
> >
> >         //I know the number of vertex is 7, six of my polygon and an
> extra
> >         //vertex to close the polygon.
> >
> >         vertexcount = 7;
> >
> >         //I can't understand what is exactly the panParts variable. :(
> >
> >         panParts[0] = 1;
> >         //What is nParts? For me my polygon has 1 part, an entire
> >     part. It is
> >     true?
> >         nParts = 1;
> >         //I give a shape id for this unique object.
> >         ShapeId=1;
> >
> >     //From the shp_api I took this line of code to create a
> feature/object
> >     //SHPCreateObject( nSHPType, iShape, nParts, panPartStart,
> >     panPartType,int
> >     nVertices, *padfX, * padfY, *padfZ, *padfM );
> >     //I have the nShapeType;
> >     //I give the ShapeId
> >     //I give the nParts
> >     //I don't know what is panParts
> >     //panPartType is NULL because it isn't a multipatch file
> >     //I know the numer of vertex
> >     //I now the number of vertex I have two arrays of coordinates.
> >     //padfZ and padfM are NULL, zero.
> >
> >         psObject = SHPCreateObject(nShapeType, ShapeId, nParts,
> >     panParts, NULL,
> >     vertexcount, X, Y, NULL, NULL );
> >
> >         SHPWriteObject( hSHP, -1, psObject );
> >
> >         SHPDestroyObject( psObject );
> >
> >         DBFClose( hDBF );
> >
> >         SHPClose( hSHP );
> >
> >
> >         return 0;
> >     }
> >
> >     [/CODE]
> >     -------------- next part --------------
> >     An HTML attachment was scrubbed...
> >     URL:
> >
> http://lists.maptools.org/pipermail/shapelib/attachments/20080217/88536964/attachment-0001.html
> >
> >     ------------------------------
> >
> >     Message: 2
> >     Date: Mon, 18 Feb 2008 00:34:51 +0100
> >     From: Tom Kazimiers <2voodoo at gmx.de <mailto:2voodoo at gmx.de>>
> >     Subject: Re: [Shapelib] Adding a polygon to a shapefile
> >     To: Shapelib Development <shapelib at lists.maptools.org
> >     <mailto:shapelib at lists.maptools.org>>
> >     Message-ID: <47B8C49B.3080801 at gmx.de <mailto:47B8C49B.3080801 at gmx.de
> >>
> >     Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> >     Hi Joaquin,
> >
> >     as fas as I understood you can not make this call:
> >     psObject = SHPCreateObject(nShapeType, ShapeId, nParts, panParts,
> >     NULL,
> >     vertexcount, X, Y, NULL, NULL );
> >
> >     have you checked if osObject is null afterwards? Please try it.
> >     Could it be that the first and the last vertex of a polygon need to
> be
> >     the same? In your code they are different.
> >     For my writing I use: SHPCreateSimpleObject which implys some NULLs
> of
> >     yours - maybe you could try this, too.
> >
> >     bye,
> >     Tom
> >
> >
> >     Joaquin Perez Valera schrieb:
> >     > Hi
> >     >
> >     > I can create shapefiles and they are valid when I work with
> >     > ArcCatalog. But the shapefiles are empty.
> >     >
> >     > Now I'm trying to add objects to my shapefile. I want to add
> >     polygons.
> >     >
> >     > First I create a shapefile and a dbf file with an a simple column.
> >     > Then it becomes valid for ArcCatalog.
> >     > Then I create 2 arrays of 7 elements X[7] and Y[7], and give a
> valor
> >     > to each element. Seven elements because
> >     > I want to draw a polygon of six vertices.
> >     >
> >     > After it I use psObject = SHPCreateObject to create my polygon and
> >     > after   SHPWriteObject( hSHP, -1, psObject ); to write it
> >     > in my shapefile.
> >     >
> >     > It's obviously that I'm doing something wrong.
> >     > But I don't know what.
> >     >
> >     > Can somebody help me or say me what I'm doing wrong?
> >     >
> >     > Thanks.
> >     >
> >     >
> >     > [CODE]
> >     > #include <iostream>
> >     > #include <cstdlib>
> >     > #include "shapefil.h"
> >     > #include "string.h"
> >     >
> >     >
> >     > using namespace std;
> >     > int main()
> >     >
> >     > {
> >     >     SHPHandle    hSHP;
> >     >     DBFHandle    hDBF;
> >     >     int        nShapeType,   nWidth = 3, vertexcount, *panParts,
> >     > ShapeId, nParts;
> >     >
> >     >     string  shape_name, Col1;
> >     >     Col1= "Column";
> >     >
> >     >     SHPObject    *psObject;
> >     >
> >     >
> >     >     cout << "Name of the new Shapefile" << endl;
> >     >     getline(cin,shape_name);
> >     >
> >     >     cout << "The shapefile is: " << shape_name << endl;
> >     >
> >     >     //Here I define the type of shapefile, the 5 is for a polygon.
> >     >     nShapeType=5;
> >     >
> >     >
> >     >     hSHP = SHPCreate( shape_name.c_str(), nShapeType );
> >     >
> >     >     hDBF = DBFCreate( shape_name.c_str() );
> >     >
> >     >
> >     >     cout <<"The shape has "<< DBFGetFieldCount( hDBF ) <<"
> >     columns" <<
> >     > endl;
> >     >
> >     >
> >     >
> >     >     DBFAddField( hDBF, Col1.c_str(), FTInteger,   nWidth, 0 );
> >     >     cout <<"Now the shape has " << DBFGetFieldCount( hDBF ) << "
> >     columns";
> >     >
> >     >     //At this point the shape is valid for ArcView
> >     >
> >     >     //Here I define an array of seven elements and I'll give a
> >     > coordinate for each element
> >     >
> >     >     double X[7], Y[7];
> >     >     X[0] = 220764;
> >     >     Y[0]= 2343777;
> >     >     X[1] = 220610;
> >     >     Y[1]= 2343627;
> >     >     X[2] = 220818;
> >     >     Y[2]= 2343477;
> >     >     X[3] = 221109;
> >     >     Y[3]= 2343777;
> >     >     X[4] = 230504;
> >     >     Y[4]= 2343627;
> >     >     X[5] = 221102;
> >     >     Y[5]= 2343477;
> >     >     X[6] = X[0];
> >     >     Y[6] = Y[0];
> >     >
> >     >
> >     >     //I know the number of vertex is 7, six of my polygon and an
> >     extra
> >     >     //vertex to close the polygon.
> >     >
> >     >     vertexcount = 7;
> >     >
> >     >     //I can't understand what is exactly the panParts variable. :(
> >     >
> >     >     panParts[0] = 1;
> >     >     //What is nParts? For me my polygon has 1 part, an entire
> >     part. It
> >     > is true?
> >     >     nParts = 1;
> >     >     //I give a shape id for this unique object.
> >     >     ShapeId=1;
> >     >
> >     > //From the shp_api I took this line of code to create a
> >     feature/object
> >     > //SHPCreateObject( nSHPType, iShape, nParts, panPartStart,
> >     > panPartType,int nVertices, *padfX, * padfY, *padfZ, *padfM );
> >     > //I have the nShapeType;
> >     > //I give the ShapeId
> >     > //I give the nParts
> >     > //I don't know what is panParts
> >     > //panPartType is NULL because it isn't a multipatch file
> >     > //I know the numer of vertex
> >     > //I now the number of vertex I have two arrays of coordinates.
> >     > //padfZ and padfM are NULL, zero.
> >     >
> >     >     psObject = SHPCreateObject(nShapeType, ShapeId, nParts,
> >     panParts,
> >     > NULL, vertexcount, X, Y, NULL, NULL );
> >     >
> >     >     SHPWriteObject( hSHP, -1, psObject );
> >     >
> >     >     SHPDestroyObject( psObject );
> >     >
> >     >     DBFClose( hDBF );
> >     >
> >     >     SHPClose( hSHP );
> >     >
> >     >
> >     >     return 0;
> >     > }
> >     >
> >     > [/CODE]
> >     >
> >     >
> >
> ------------------------------------------------------------------------
> >     >
> >     > _______________________________________________
> >     > Shapelib mailing list
> >     > Shapelib at lists.maptools.org <mailto:Shapelib at lists.maptools.org>
> >     > http://lists.maptools.org/mailman/listinfo/shapelib
> >     >
> >
> >
> >
> >     ------------------------------
> >
> >     Message: 3
> >     Date: Mon, 18 Feb 2008 00:43:00 +0100
> >     From: Tom Kazimiers <2voodoo at gmx.de <mailto:2voodoo at gmx.de>>
> >     Subject: Re: [Shapelib] Adding a polygon to a shapefile
> >     To: Shapelib Development <shapelib at lists.maptools.org
> >     <mailto:shapelib at lists.maptools.org>>
> >     Message-ID: <47B8C684.5040701 at gmx.de <mailto:47B8C684.5040701 at gmx.de
> >>
> >     Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> >     Joaquin,
> >
> >     sorry - I missed that you actually do have first and last elements
> the
> >     same of your vertex arrays :)
> >     But could you please write down where the error appears and what
> >     kind of
> >     error it is?
> >
> >     cheers,
> >     Tom
> >
> >     Tom Kazimiers schrieb:
> >     > Hi Joaquin,
> >     >
> >     > as fas as I understood you can not make this call:
> >     > psObject = SHPCreateObject(nShapeType, ShapeId, nParts, panParts,
> >     > NULL, vertexcount, X, Y, NULL, NULL );
> >     >
> >     > have you checked if osObject is null afterwards? Please try it.
> >     > Could it be that the first and the last vertex of a polygon need
> >     to be
> >     > the same? In your code they are different.
> >     > For my writing I use: SHPCreateSimpleObject which implys some
> >     NULLs of
> >     > yours - maybe you could try this, too.
> >     >
> >     > bye,
> >     > Tom
> >     >
> >     >
> >     > Joaquin Perez Valera schrieb:
> >     >> Hi
> >     >>
> >     >> I can create shapefiles and they are valid when I work with
> >     >> ArcCatalog. But the shapefiles are empty.
> >     >>
> >     >> Now I'm trying to add objects to my shapefile. I want to add
> >     polygons.
> >     >>
> >     >> First I create a shapefile and a dbf file with an a simple
> column.
> >     >> Then it becomes valid for ArcCatalog.
> >     >> Then I create 2 arrays of 7 elements X[7] and Y[7], and give a
> >     valor
> >     >> to each element. Seven elements because
> >     >> I want to draw a polygon of six vertices.
> >     >>
> >     >> After it I use psObject = SHPCreateObject to create my polygon
> and
> >     >> after   SHPWriteObject( hSHP, -1, psObject ); to write it
> >     >> in my shapefile.
> >     >>
> >     >> It's obviously that I'm doing something wrong.
> >     >> But I don't know what.
> >     >>
> >     >> Can somebody help me or say me what I'm doing wrong?
> >     >>
> >     >> Thanks.
> >     >>
> >     >>
> >     >> [CODE]
> >     >> #include <iostream>
> >     >> #include <cstdlib>
> >     >> #include "shapefil.h"
> >     >> #include "string.h"
> >     >>
> >     >>
> >     >> using namespace std;
> >     >> int main()
> >     >>
> >     >> {
> >     >>     SHPHandle    hSHP;
> >     >>     DBFHandle    hDBF;
> >     >>     int        nShapeType,   nWidth = 3, vertexcount, *panParts,
> >     >> ShapeId, nParts;
> >     >>
> >     >>     string  shape_name, Col1;
> >     >>     Col1= "Column";
> >     >>       SHPObject    *psObject;
> >     >>          cout << "Name of the new Shapefile" << endl;
> >     >>     getline(cin,shape_name);
> >     >>
> >     >>     cout << "The shapefile is: " << shape_name << endl;
> >     >>
> >     >>     //Here I define the type of shapefile, the 5 is for a
> polygon.
> >     >>     nShapeType=5;
> >     >>           hSHP = SHPCreate( shape_name.c_str(), nShapeType );
> >     >>
> >     >>     hDBF = DBFCreate( shape_name.c_str() );
> >     >>                  cout <<"The shape has "<< DBFGetFieldCount( hDBF
> )
> >     >> <<" columns" << endl;
> >     >>            DBFAddField( hDBF, Col1.c_str(), FTInteger,
> >     nWidth, 0 );
> >     >>     cout <<"Now the shape has " << DBFGetFieldCount( hDBF ) << "
> >     >> columns";
> >     >>        //At this point the shape is valid for ArcView
> >     >>
> >     >>     //Here I define an array of seven elements and I'll give a
> >     >> coordinate for each element
> >     >>        double X[7], Y[7];
> >     >>     X[0] = 220764;
> >     >>     Y[0]= 2343777;
> >     >>     X[1] = 220610;
> >     >>     Y[1]= 2343627;
> >     >>     X[2] = 220818;
> >     >>     Y[2]= 2343477;
> >     >>     X[3] = 221109;
> >     >>     Y[3]= 2343777;
> >     >>     X[4] = 230504;
> >     >>     Y[4]= 2343627;
> >     >>     X[5] = 221102;
> >     >>     Y[5]= 2343477;
> >     >>     X[6] = X[0];
> >     >>     Y[6] = Y[0];
> >     >>           //I know the number of vertex is 7, six of my polygon
> and
> >     >> an extra
> >     >>     //vertex to close the polygon.
> >     >>        vertexcount = 7;
> >     >>        //I can't understand what is exactly the panParts
> >     variable. :(
> >     >>        panParts[0] = 1;
> >     >>     //What is nParts? For me my polygon has 1 part, an entire
> part.
> >     >> It is true?
> >     >>     nParts = 1;
> >     >>     //I give a shape id for this unique object.
> >     >>     ShapeId=1;
> >     >>    //From the shp_api I took this line of code to create a
> >     >> feature/object
> >     >> //SHPCreateObject( nSHPType, iShape, nParts, panPartStart,
> >     >> panPartType,int nVertices, *padfX, * padfY, *padfZ, *padfM );
> >     >> //I have the nShapeType;
> >     >> //I give the ShapeId
> >     >> //I give the nParts
> >     >> //I don't know what is panParts
> >     >> //panPartType is NULL because it isn't a multipatch file
> >     >> //I know the numer of vertex
> >     >> //I now the number of vertex I have two arrays of coordinates.
> >     >> //padfZ and padfM are NULL, zero.
> >     >>
> >     >>     psObject = SHPCreateObject(nShapeType, ShapeId, nParts,
> >     panParts,
> >     >> NULL, vertexcount, X, Y, NULL, NULL );
> >     >>        SHPWriteObject( hSHP, -1, psObject );
> >     >>        SHPDestroyObject( psObject );
> >     >>        DBFClose( hDBF );
> >     >>       SHPClose( hSHP );
> >     >>               return 0;
> >     >> }
> >     >>
> >     >> [/CODE]
> >     >>
> >     >>
> >
> ------------------------------------------------------------------------
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