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MONGOC_GRIDFS_BUCKET_T(3) libmongoc MONGOC_GRIDFS_BUCKET_T(3) SYNOPSIS #include <mongoc/mongoc.h> typedef struct _mongoc_gridfs_bucket_t mongoc_gridfs_bucket_t; DESCRIPTION mongoc_gridfs_bucket_t provides a spec-compliant MongoDB GridFS imple- mentation, superseding mongoc_gridfs_t. See the GridFS MongoDB documen- tation. THREAD SAFETY mongoc_gridfs_bucket_t is NOT thread-safe and should only be used in the same thread as the owning mongoc_client_t. LIFECYCLE It is an error to free a mongoc_gridfs_bucket_t before freeing all de- rived instances of mongoc_stream_t. The owning mongoc_client_t must outlive the mongoc_gridfs_bucket_t. EXAMPLE example-gridfs-bucket.c #include <stdio.h> #include <stdlib.h> #include <mongoc/mongoc.h> int main (int argc, char *argv[]) { const char *uri_string = "mongodb://localhost:27017/?appname=new-gridfs-example"; mongoc_client_t *client; mongoc_database_t *db; mongoc_stream_t *file_stream; mongoc_gridfs_bucket_t *bucket; mongoc_cursor_t *cursor; bson_t filter; bool res; bson_value_t file_id; bson_error_t error; const bson_t *doc; char *str; mongoc_init (); if (argc != 3) { fprintf (stderr, "usage: %s SOURCE_FILE_PATH FILE_COPY_PATH\n", argv[0]); return EXIT_FAILURE; } /* 1. Make a bucket. */ client = mongoc_client_new (uri_string); db = mongoc_client_get_database (client, "test"); bucket = mongoc_gridfs_bucket_new (db, NULL, NULL, &error); if (!bucket) { printf ("Error creating gridfs bucket: %s\n", error.message); return EXIT_FAILURE; } /* 2. Insert a file. */ file_stream = mongoc_stream_file_new_for_path (argv[1], O_RDONLY, 0); res = mongoc_gridfs_bucket_upload_from_stream (bucket, "my-file", file_stream, NULL, &file_id, &error); if (!res) { printf ("Error uploading file: %s\n", error.message); return EXIT_FAILURE; } mongoc_stream_close (file_stream); mongoc_stream_destroy (file_stream); /* 3. Download the file in GridFS to a local file. */ file_stream = mongoc_stream_file_new_for_path (argv[2], O_CREAT | O_RDWR, 0); if (!file_stream) { perror ("Error opening file stream"); return EXIT_FAILURE; } res = mongoc_gridfs_bucket_download_to_stream (bucket, &file_id, file_stream, &error); if (!res) { printf ("Error downloading file to stream: %s\n", error.message); return EXIT_FAILURE; } mongoc_stream_close (file_stream); mongoc_stream_destroy (file_stream); /* 4. List what files are available in GridFS. */ bson_init (&filter); cursor = mongoc_gridfs_bucket_find (bucket, &filter, NULL); while (mongoc_cursor_next (cursor, &doc)) { str = bson_as_canonical_extended_json (doc, NULL); printf ("%s\n", str); bson_free (str); } /* 5. Delete the file that we added. */ res = mongoc_gridfs_bucket_delete_by_id (bucket, &file_id, &error); if (!res) { printf ("Error deleting the file: %s\n", error.message); return EXIT_FAILURE; } /* 6. Cleanup. */ mongoc_stream_close (file_stream); mongoc_stream_destroy (file_stream); mongoc_cursor_destroy (cursor); bson_destroy (&filter); mongoc_gridfs_bucket_destroy (bucket); mongoc_database_destroy (db); mongoc_client_destroy (client); mongoc_cleanup (); return EXIT_SUCCESS; } SEE ALSO: The MongoDB GridFS specification. The non spec-compliant mongoc_gridfs_t. AUTHOR MongoDB, Inc COPYRIGHT 2009-present, MongoDB, Inc. 1.30.2 Apr 12, 2025 MONGOC_GRIDFS_BUCKET_T(3)
SYNOPSIS | DESCRIPTION | THREAD SAFETY | LIFECYCLE | EXAMPLE | AUTHOR | COPYRIGHT
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