Re: [protobuf] [De]serialization of messages to java strings
Strings contain text, not arbitrary bytes. Encoded protocol buffers are arbitrary bytes, not text. So, they aren't compatible. You would need to do something like base-64 encode the data in order to put it in a String. On Tue, Nov 24, 2009 at 3:16 PM, Will Morton will.mor...@gmail.com wrote: Hello all; I need to serialize a protobuf message to a string so that it can be passed outside my program. The below fails, I'm guessing due to UTF8 encoding issues: byte[] arr = msg.toByteArray(); String str = new String(arr); // ... pass str around ... MsgType msg2 = MsgType.parseFrom(str.getBytes()); // -- throws InvalidProtocolBufferException So, reading the API, I thought I should use ByteStrings, with their handy UTF8 encoding methods, but this doesn't work either: ByteString bs = msg.toByteString(); String str = bs.toStringUtf8(); // ... pass str around ... ByteString bs2 = ByteString.copyFromUtf8(str); MsgType msg2 = MsgType.parseFrom(bs2); // -- Still throws exception What am I doing wrong? What's the best way to do java string serialization of protobuf messages? Thanks in advance, Will -- You received this message because you are subscribed to the Google Groups Protocol Buffers group. To post to this group, send email to proto...@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.comprotobuf%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/protobuf?hl=en. -- You received this message because you are subscribed to the Google Groups Protocol Buffers group. To post to this group, send email to proto...@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
Re: [protobuf] [De]serialization of messages to java strings
2009/11/25 Adam Vartanian flo...@google.com: What am I doing wrong? What's the best way to do java string serialization of protobuf messages? If you absolutely have to pass things around as a String, you're going to need to do so in some kind of encoding that supports arbitrary data. For example, you could encode it in Base64. Great, thanks guys... I was wondering if protobuf had a more efficient string-safe encoding, but I'll just base64 it. Cheers! Will -- You received this message because you are subscribed to the Google Groups Protocol Buffers group. To post to this group, send email to proto...@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
Re: [protobuf] [De]serialization of messages to java strings
You can use TextFormat but it is probably *less* efficient than base64. On Tue, Nov 24, 2009 at 4:14 PM, Will Morton will.mor...@gmail.com wrote: 2009/11/25 Adam Vartanian flo...@google.com: What am I doing wrong? What's the best way to do java string serialization of protobuf messages? If you absolutely have to pass things around as a String, you're going to need to do so in some kind of encoding that supports arbitrary data. For example, you could encode it in Base64. Great, thanks guys... I was wondering if protobuf had a more efficient string-safe encoding, but I'll just base64 it. Cheers! Will -- You received this message because you are subscribed to the Google Groups Protocol Buffers group. To post to this group, send email to proto...@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.comprotobuf%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/protobuf?hl=en. -- You received this message because you are subscribed to the Google Groups Protocol Buffers group. To post to this group, send email to proto...@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
Re: [protobuf] [De]serialization of messages to java strings
What am I doing wrong? What's the best way to do java string serialization of protobuf messages? The native wire format of protocol buffers is just a sequence of bytes, so it can contain values that are invalid UTF-8 (or any encoding that has invalid byte sequences). Trying to pack that into a String, which holds Unicode character data, isn't going to work well; Strings are welcome to mangle the bytes however they want as long as the same characters are represented. If you want to pass a serialized protocol buffer to something else, you should generally use a ByteString, byte[], or ByteBuffer. If you absolutely have to pass things around as a String, you're going to need to do so in some kind of encoding that supports arbitrary data. For example, you could encode it in Base64. - Adam -- You received this message because you are subscribed to the Google Groups Protocol Buffers group. To post to this group, send email to proto...@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
