MongoDB C++ gridfs worked example
#include <mongoc.h>#include
<stdio.h>
#include
<stdlib.h>
#include
<fcntl.h>
class MongoGridFS {
public:
MongoGridFS(const char* db);
~MongoGridFS();
void saveFile(const char* input_file_path, const char* filename);
private:
mongoc_gridfs_t *gridfs;
mongoc_client_t *client;
};
MongoGridFS::MongoGridFS(const char* db) {
assert(db != NULL);
mongoc_init ();
/* connect to localhost client */
client = mongoc_client_new ("mongodb://127.0.0.1:27017?appname=gridfs-example");
assert (client);
mongoc_client_set_error_api (client, 2);
/* grab a gridfs handle in test prefixed by fs */
bson_error_t error;
gridfs = mongoc_client_get_gridfs (client, db, "fs", &error);
assert (gridfs);
}
void MongoGridFS::saveFile(const char* input_file_path, const char* filename) {
assert(input_file_path != NULL && filename != NULL);
mongoc_stream_t *stream = mongoc_stream_file_new_for_path (input_file_path, O_RDONLY, 0);
assert (stream);
mongoc_gridfs_file_opt_t opt = {0};
opt.filename = filename;
/* the driver generates a file_id for you */
mongoc_gridfs_file_t *file = mongoc_gridfs_create_file_from_stream (gridfs, stream, &opt);
assert (file);
mongoc_gridfs_file_save (file);
mongoc_gridfs_file_destroy (file);
}
MongoGridFS::~MongoGridFS() {
mongoc_gridfs_destroy (gridfs);
mongoc_client_destroy (client);
mongoc_cleanup ();
}
int
main (int argc, char *argv[])
{
MongoGridFS gridfs("test2gridfs");
gridfs.saveFile("test.py", "test.py");
return 0;
}
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