[Shapelib] Adding a polygon to a shapefile (Tom Kazimiers)
Tom Kazimiers
2voodoo at gmx.de
Wed Feb 20 20:02:43 EST 2008
Hi Joaquin,
hm, yes I do use Visual Studio to write my code. As said before you can
ignore the inclusion of "stdafx.h" - I do not use it either.
I will try to compile and run the example with Dev C++ tomorrow.
Unfortunately, I do not have ArcCatalog to test the shapefiles. I use a
little tool called "shape viewer" which displays the map just fine.
Also, a tool I wrote has had no problems with the generated file.
But in general it should not depend on the IDE and the compiler with
this code.
Could you send me the generated shape files?
Cheers,
Tom
Joaquin Perez Valera schrieb:
>
> Hi Tom
>
> I'm in home.
>
> I already compiled your version of the code, but there is not good
> results.
> A shapefile is generated, but I can't read it with ArcCatalog.
>
> Ah, do you have an IDE to write the code, I know this because I saw
> your header #include "stdafx.h".
>
> Do you have Visual C++?
>
> Or wich IDE?
>
> I have Dev-C`++
>
> Thanks.
>
>
>
> 2008/2/20, 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 <mailto:2voodoo at gmx.de>>
> Subject: Re: [Shapelib] Re: Adding a polygon to a shapefile
> To: Shapelib Development <shapelib at lists.maptools.org
> <mailto:shapelib at lists.maptools.org>>
> Message-ID: <47BBFAEA.8060004 at gmx.de <mailto: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>
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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>
> > <mailto: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>
> <mailto:shapelib at lists.maptools.org
> <mailto:shapelib at lists.maptools.org>>
> > Message-ID:
> >
> <79a4e0710802171430y7dbad9c0p34780e668e3546ff at mail.gmail.com
> <mailto:79a4e0710802171430y7dbad9c0p34780e668e3546ff at mail.gmail.com>
> >
> <mailto: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>
> <mailto: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>
> > <mailto:shapelib at lists.maptools.org
> <mailto:shapelib at lists.maptools.org>>>
> > Message-ID: <47B8C49B.3080801 at gmx.de
> <mailto:47B8C49B.3080801 at gmx.de> <mailto: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>
> <mailto: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>
> <mailto: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>
> > <mailto:shapelib at lists.maptools.org
> <mailto:shapelib at lists.maptools.org>>>
> > Message-ID: <47B8C684.5040701 at gmx.de
> <mailto:47B8C684.5040701 at gmx.de> <mailto: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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