I want transmitting one big buffer containing all the segments, 在 2019年10月1日星期二 UTC+8上午3:23:37，Kenton Varda写道： > > Are you transmitting one big buffer containing all the segments, or are > you transmitting each segment separately? > > It looks like you're trying to do the latter, but in that case you cannot > use Serialize.read() to read it. You need to use `new > MessageReader(segments)`. > > -Kenton > > On Mon, Sep 30, 2019 at 5:52 AM 张小 <[email protected] <javascript:>> wrote: > >> First Time: >> In C++ server,I Use capnp::DynamicStruct, code like this: >> capnp::MallocMessageBuilder msg; >> capnp::DynamicStruct::Builder fullinfo_builder >> = msg.initRoot<capnp::DynamicStruct>(g_schema); >> capnp::DynamicStruct::Builder fullInfo = >> msg.initRoot<capnp::DynamicStruct>(g_schema); >> >> capnp::messageToFlatArray(msg); ---->convert it to char* send to >> java_cliet >> >> Java Client ,code like this: >> MessageReader message >> = org.capnproto.Serialize.read(capn_object_bytes.asReadOnlyByteBuffer());, >> Info.Reader adInfo = message.getRoot(Info.factory); >> >> Above ， My First Time do work , but The Second Time, I do like this ,it >> do not work: >> In C++ server, code like this: >> >> capnp::MallocMessageBuilder message; >> Info::Builder info = message.initRoot<Info>(); >> info.setId(123); >> kj::ArrayPtr<const kj::ArrayPtr<const capnp::word>> segments = >> message.getSegmentsForOutput(); >> >> then I convert the segments object to char* send to java_client by >> proto rpc_call (bytes field) >> >> >> Java Client ,code like this: >> MessageReader message >> = org.capnproto.Serialize.read(capn_object_bytes.asReadOnlyByteBuffer());, >> Info.Reader adInfo = message.getRoot(Info.factory); >> >> >> In Second Time, happen Error like this: >> >> Exception in thread "main" java.lang.IllegalArgumentException >> at java.nio.Buffer.limit(Buffer.java:275) >> at org.capnproto.Serialize.read(Serialize.java:140) >> at org.capnproto.Serialize.read(Serialize.java:111) >> >> How Can I do , In Second Time ,thanks >> >> >> >> >> >> >> 在 2019年9月30日星期一 UTC+8下午8:29:41，David Renshaw写道： >>> >>> On the Java side, you need to first read the bytes into a >>> `MessageReader`. That's typically done via one of the `Serialize.read()` >>> methods. >>> >>> The `AnyPointer.Reader()` is not intended for external use. Probably we >>> should make it private. >>> >>> >>> On Mon, Sep 30, 2019 at 6:25 AM 张小 <[email protected]> wrote: >>> >>>> C++ server send Capn Object to JavaClient like this >>>> >>>> capnp::MallocMessageBuilder message; >>>> Info::Builder info = message.initRoot<Info>(); >>>> info.setId(123); >>>> kj::ArrayPtr<const kj::ArrayPtr<const capnp::word>> segments = >>>> message.getSegmentsForOutput(); >>>> >>>> then I convert the segments object to char* send to java_client by >>>> proto rpc_call (bytes field) >>>> >>>> >>>> Then In java_client, I do like this to read the capn object >>>> com.google.protobuf.ByteString capn_object_bytes = >>>> response.getCapnObject() >>>> SegmentReader segment = new >>>> SegmentReader(capn_object_bytes.asReadOnlyByteBuffer(), null); >>>> AnyPointer.Reader any = new AnyPointer.Reader(segment, 0, 64*1024*1024); >>>> Info.Reader info = any.getAs(Info.factory); >>>> System.out.println("Id:" + info.getId()); >>>> >>>> >>>> run java_cliet ,happend error like this : >>>> Exception in thread "main" java.lang.NullPointerException >>>> at org.capnproto.WireHelpers.readStructPointer(WireHelpers.java:918) >>>> at >>>> org.capnproto.StructFactory.fromPointerReaderRefDefault(StructFactory.java:34) >>>> at org.capnproto.StructFactory.fromPointerReader(StructFactory.java:41) >>>> at org.capnproto.StructFactory.fromPointerReader(StructFactory.java:24) >>>> at org.capnproto.AnyPointer$Reader.getAs(AnyPointer.java:56) >>>> >>>> >>>> >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Cap'n Proto" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/capnproto/081ab20b-5eae-43d5-a4fc-8230ef39d4a5%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/capnproto/081ab20b-5eae-43d5-a4fc-8230ef39d4a5%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >> You received this message because you are subscribed to the Google Groups >> "Cap'n Proto" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/capnproto/816c3227-c2b2-4b72-8ead-e707759a257c%40googlegroups.com >> >> <https://groups.google.com/d/msgid/capnproto/816c3227-c2b2-4b72-8ead-e707759a257c%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >
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