boost :: asio :: streambuf empty？ [英] boost::asio::streambuf empty?

问题描述

我使用boost :: asio :: streambuf来写一个ostream到我的boost socket。

I am using boost::asio::streambuf to write a ostream to my boost socket.

Name name;
name.set_name("platzhirsch");

boost::asio::streambuf b;
std::ostream os(&b);

ZeroCopyOutputStream *raw_output = new OstreamOutputStream(&os);
CodedOutputStream *coded_output = new CodedOutputStream(raw_output);

coded_output->WriteVarint32(name.ByteSize());
name.SerializeToCodedStream(coded_output);

socket.send(b.data());

但是，send返回的size_t是0.我怀疑没有数据发送。也因为客户端套接字抛出可怕的异常。我问，如果有一些奇怪的我的代码。

However, size_t returned by send is 0. I am suspicious that no data is sent at all. Also because the client socket throws horrible exceptions. I am asking, if there is something strange about my code.

换句话说，我可以测试streambuf是否为空或如果写入它的数据真的存在。

In other words, can I test if streambuf is empty or if the data written to it is really there.

推荐答案

boost :: asio没有问题，这是Google protobuf的问题。

It was no problem of boost::asio, it was a problem of Google protobuf.

为了刷新CodedOutputStream，必须删除它们：

In order to flush the CodedOutputStream, they have to be deleted:

ZeroCopyOutputStream *raw_output = new OstreamOutputStream(&os);
CodedOutputStream *coded_output = new CodedOutputStream(raw_output);

coded_output->WriteVarint32(name.ByteSize());
name.SerializeToCodedStream(coded_output);

delete coded_output;
delete raw_output;

socket.send(b.data());

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