显示带有 0 个字符的字符串的完整字符串
show full string from string with chars
char data_[4096];
...
socket_.async_read_some(boost::asio::buffer(data_, 4096),
boost::bind(&client::handle_read_header, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
触发函数 handle_read_header
时,data_
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