[geos-devel] Status (New Example)

[Dave Blasby]

Quoting Norman Vine <nhv at cape.com>:

> 
> Let me try that again I cleaned up to much of
> my debugging 'cruft' from my earlier files

I've tried running your files, but I get the same results as before.  (I put 
the words "norman" in so I was sure it was using the correct .o files).

I had a though on friday that the c++ wrapper ("test_cpp.cpp") might need more 
compile options than "-c"; say something like "-fpic".

Here's what i did (see the bottom for version info):

[dblasby at hydra work_dave]$ rm *.o
[dblasby at hydra work_dave]$ g++ -g test_cpp.cpp -c -I/usr/local/include/geos
[dblasby at hydra work_dave]$ gcc -g -o test test.c test_cpp.o -lm -lgeos -lstdc++
[dblasby at hydra work_dave]$ ./test
geom text (to be parsed norman):POLYGON((100 200,100 140,180 140,180 200,100 
200))

geom (WKTWriter):POLYGON ((100.0000000000000000 200.0000000000000000, 
100.0000000000000000 140.0000000000000000, 180.0000000000000000 
140.0000000000000000, 180.0000000000000000 200.0000000000000000, 
100.0000000000000000 200.0000000000000000))

result in C (norman) is
POLYGON ((100.0000000000000000 200.0000000000000000, 100.0000000000000000 
140.0000000000000000, inf inf, inf inf, inf inf))
[dblasby at hydra work_dave]$[dblasby at hydra work_dave]$ cat test.c
//c++ -c test_cpp.cpp
//gcc -g -o test test.c test_cpp.o -lm -lgeos -lstdc++

#include "stdio.h"
#include "geos_api.h"

extern    GeometryWrapper createGEOSFromText(char *wkt);
extern    char * GEOSasText(GeometryWrapper g1);


int main(int argC, char* argV[])
{
                        GeometryWrapper g =
createGEOSFromText("POLYGON((100 200,100 140,180 140,180 200,100 200))");

                        printf("\nresult in C (norman) is
%s\n",GEOSasText(g));
}

[dblasby at hydra work_dave]$ cat geos_api.h
#ifdef __cplusplus
#  define GEOS_C_START           extern "C" {
#  define GEOS_C_END             }
#else
#  define GEOS_C_START
#  define GEOS_C_END
#endif

GEOS_C_START;

typedef void *GeometryWrapper;

GeometryWrapper createGEOSFromText(char *wkt);
char * GEOSasText(GeometryWrapper g1);

GEOS_C_END;

[dblasby at hydra work_dave]$ cat test_cpp.cpp
// g++ -g test.cpp -c -I/usr/local/include/geos

#include <string>
#include <iostream>
#include <fstream>

#include "io.h"
#include "geos_api.h"

char *GEOSasText(GeometryWrapper g)
{
        Geometry *g1 = (Geometry *)g;

        WKTWriter *w=new WKTWriter();

        string s = w->write(g1);

        char *result = (char *)s.c_str();

        return result ;
}


GeometryWrapper createGEOSFromText(char *wkt)
{
        cout  <<"geom text (to be parsed norman):"<< wkt << endl;

    Geometry *g = new Geometry;

        WKTReader *r = new WKTReader(new GeometryFactory(new
PrecisionModel(),-1));

        g = r->read(wkt);

        WKTWriter *w=new WKTWriter();

    cout << endl << "geom (WKTWriter):"<< w->write(g) << endl;

        delete r;
    delete w;

        return (GeometryWrapper)g;
}



[dblasby at hydra work_dave]$
[dblasby at hydra work_dave]$ ldd test
        libm.so.6 => /lib/libm.so.6 (0x40028000)
        libgeos.so.1 => /usr/local/lib/libgeos.so.1 (0x4004a000)
        libstdc++-libc6.2-2.so.3 => /usr/lib/libstdc++-libc6.2-2.so.3 
(0x40100000)
        libc.so.6 => /lib/libc.so.6 (0x4014e000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)

[dblasby at hydra work_dave]$ gcc --version
2.96
[dblasby at hydra work_dave]$ g++ --version
2.96
[dblasby at hydra work_dave]$ ln --version
ln (fileutils) 4.1.5
Written by Mike Parker and David MacKenzie.

Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.