Abdelrahman Said
87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/*
|
|
igraph library.
|
|
Copyright (C) 2006-2022 The igraph development team
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
02110-1301 USA
|
|
|
|
*/
|
|
|
|
#include <igraph.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h> /* unlink */
|
|
|
|
int main(void) {
|
|
igraph_t graph;
|
|
const char *infilename = "test.graphml";
|
|
const char *outfilename = "test2.graphml";
|
|
|
|
/* Initialize the library. */
|
|
igraph_setup();
|
|
|
|
/* Set up attribute handling, so graph attributes can be imported
|
|
* from the GraphML file. */
|
|
igraph_set_attribute_table(&igraph_cattribute_table);
|
|
|
|
/* Problems in the GraphML file may cause igraph to print warnings.
|
|
* If this is not desired, set a silent warning handler: */
|
|
igraph_set_warning_handler(&igraph_warning_handler_ignore);
|
|
|
|
/* Read the contents of a GraphML file. */
|
|
|
|
/* GraphML */
|
|
FILE *infile = fopen("test.graphml", "r");
|
|
if (! infile) {
|
|
fprintf(stderr, "Could not open input file '%s'.", infilename);
|
|
exit(1);
|
|
}
|
|
|
|
/* GraphML support is an optional feature in igraph. If igraph was compiled
|
|
* without GraphML support, igraph_read_graph_graphml() returns IGRAPH_UNIMPLEMENTED.
|
|
* We temporarily disable the default error handler so we can test for this condition. */
|
|
igraph_error_handler_t *oldhandler = igraph_set_error_handler(igraph_error_handler_ignore);
|
|
igraph_error_t ret = igraph_read_graph_graphml(&graph, infile, 0);
|
|
if (ret == IGRAPH_UNIMPLEMENTED) {
|
|
fprintf(stderr, "igraph was compiled without GraphML support.");
|
|
exit(77);
|
|
}
|
|
if (ret != IGRAPH_SUCCESS) {
|
|
fprintf(stderr, "Unexpected error while reading GraphML.");
|
|
exit(1);
|
|
}
|
|
igraph_set_error_handler(oldhandler);
|
|
|
|
|
|
fclose(infile);
|
|
|
|
/* Write it back into another file. */
|
|
|
|
FILE *outfile = fopen(outfilename, "w");
|
|
if (outfile) {
|
|
igraph_write_graph_graphml(&graph, outfile, true);
|
|
fclose(outfile);
|
|
|
|
/* Clean up after ourselves */
|
|
unlink(outfilename);
|
|
} else {
|
|
fprintf(stderr, "Could not write output file '%s'.", outfilename);
|
|
}
|
|
|
|
/* Destroy the graph */
|
|
igraph_destroy(&graph);
|
|
|
|
return 0;
|
|
}
|