How can I fetch binary data from mongoDB in node.js ?

[Natalie]

How can I fetch binary data from mongoDB in node.js ?

db.collection('photos', function(err, collection) {
collection.find({'_id': '123456'}, function(err, cursor) {
cursor.toArray(function(err, items) {
..........................
});
});
});

this code not working, the server hangs up.

[maga]

If you really need to work with binary data, you should use GridFS for storing binary data in MongoDB, and so you should use GridFS functionality of node-mongodb-native to fetch or to do whatever: http://goo.gl/WIC48

[Natalie]

My data is less then 4Mb, I dont want to use GridFS.
I dont have problems with reading binary fields in C++ and php.
Maybe there's some kind of trick.
Please help me.

[Natalie]

in case of 256KB chanks, looks like GridFS makes 5 disk reads to get
1MB photo. this is not what would I expect from the best performing
server.
in our case we can even optimize majority of photos to under 256KB
size, but node-mongodb-native does not allow me to read this from
MongoDB with one disk read and without overhead of having second
table. Is it "designed drawback", or I'm doing something wrong?

[Natalie]

diff ./node/lib/mongodb/bson/bson.js ./node/lib/mongodb/bson/
bson.js.orig
303,306c302,303
< // var number_of_bytes = BinaryParser.toInt(data.substr(index,
4));
< // index = index + 4;
< var number_of_bytes=total_number_of_bytes;
---
> var number_of_bytes = BinaryParser.toInt(data.substr(index, 4));
> index = index + 4;

It helped me.