A C library for reading ESRI shapefiles. The shapefile format is a geospatial vector data format for geographic information system software.
The library supports the shp, shx and dbf formats.
Requires a C compiler that supports the C99 standard and CMake.
Run the following commands to install the library:
mkdir build
cd build
cmake ..
make
make test
make install
See Makefile.PL for information on how to add the library to a Perl XS module.
#include "shapereader/shapereader.h"
void print_field(const dbf_record_t *record, const dbf_field_t *field) {
char *s;
double d;
switch (field->type) {
case DBF_TYPE_CHARACTER:
s = dbf_record_strdup(record, field);
if (s != NULL) {
puts(s);
free(s);
}
break;
case DBF_TYPE_FLOAT:
case DBF_TYPE_NUMBER:
if (dbf_record_strtod(record, field, &d)) {
printf("%lf\n", d);
}
break;
}
}
int read_dbf(const char *filename) {
int rc = -1;
FILE *stream;
dbf_file_t fh;
dbf_header_t *header;
dbf_record_t *record;
dbf_field_t *field;
stream = fopen(filename, "rb");
if (stream != NULL) {
dbf_init_file(&fh, stream, NULL);
if ((rc = dbf_read_header(&fh, &header)) > 0) {
while ((rc = dbf_read_record(&fh, &record)) > 0) {
if (!dbf_record_is_deleted(record)) {
field = header->fields;
while (field != NULL) {
print_field(record, field);
field = field->next;
}
}
free(record);
}
free(header);
}
if (rc < 0) {
fprintf(stderr, "%s\n", fh.error);
}
fclose(stream);
}
return rc;
}
void print_shape(const shp_record_t *record) {
double x, y;
switch (record->type) {
case SHP_TYPE_POINT:
x = record->shape.point.x;
y = record->shape.point.y;
printf("[%lf, %lf]\n", x, y);
break;
}
}
int read_shp(const char *filename) {
int rc = -1;
FILE *stream;
shp_file_t fh;
shp_header_t header;
shp_record_t *record;
stream = fopen(filename, "rb");
if (stream != NULL) {
shp_init_file(&fh, stream, NULL);
if ((rc = shp_read_header(&fh, &header)) > 0) {
while ((rc = shp_read_record(&fh, &record)) > 0) {
print_shape(record);
free(record);
}
}
if (rc < 0) {
fprintf(stderr, "%s\n", fh.error);
}
fclose(stream);
}
return rc;
}
int main(int argc, char *argv[]) {
read_dbf("file.dbf");
read_shp("file.shp");
return 0;
}Copyright (C) 2023 Andreas Vögele
This library is free software; you can redistribute it and/or modify it under either the terms of the ISC License or the same terms as Perl.