[英]boost::asio::udp async response is not entirely received
My program sends an udp datagram to a server. 我的程序将udp数据报发送到服务器。 Using wireshark I see the query and the response from the server (79 Bytes).
使用wireshark,我可以查看查询和来自服务器的响应(79字节)。
void Query::start_send(const std::string data, const QueryType queryType) {
boost::shared_ptr<std::string> message(new std::string(data));
socket.async_send_to(boost::asio::buffer(*message), endPoint,
boost::bind(&Query::handler_send, this, message,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
this->queryType = queryType;
}
void Query::start_receive() {
socket.async_receive_from(
boost::asio::buffer(receiveBuffer, receiveBuffer.max_size()), endPoint,
boost::bind(&Query::handler_receive, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
}
void Query::handler_receive(const boost::system::error_code& error, std::size_t bytes_transferred)
{
if (!error || error == boost::asio::error::message_size) {
std::cout << "Bytes transferred " << bytes_transferred << std::endl << strlen((char*)this->receiveBuffer.data()) << std::endl;
}
else {
std::cout << "Receive failed" << std::endl << error.value() << std::endl << error.message() << std::endl;
}
}
Bytes transferred 79
11
The bytes_transferred value is correct but my response buffer (char vector) "receiveBuffer" contains only 11 Bytes instead of 79 Bytes. bytes_transferred值正确,但是我的响应缓冲区(字符向量)“ receiveBuffer”仅包含11个字节,而不是79个字节。
Your issue is with strlen((char*)this->receiveBuffer.data())
. 您的问题是
strlen((char*)this->receiveBuffer.data())
。
strlen
accepts a nul-terminated C-string as input. strlen
接受以n终止的C字符串作为输入。 So it stops counting when it encounters the byte 00
. 因此,当遇到字节
00
时,它将停止计数。
You seem to receive mixed binary/text data. 您似乎收到混合的二进制/文本数据。 You can't simply print it out as a string.
您不能简单地将其打印为字符串。
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