使用以下课程
标题:
namespace msgSrv {
class endPoint {
public:
asio::ip::udp::endpoint ep;
endPoint(std::string ip, int port);
};
class msgSrv {
private:
asio::ip::udp::socket *asioSocket;
asio::io_service *asioIoService;
int listenPort;
boost::array<char, 1> rcvBuff;
asio::ip::udp::endpoint lastRcvdPcktEndp;
char * sbuff;
public:
boost::condition_variable cond;
boost::mutex mut;
msgSrv(int listenPort);
virtual ~msgSrv();
void start();
void pckRcvd(const asio::error_code& error, std::size_t bytes_transferred);
void sendTo(const char* buff, int len, endPoint ep);
void sendHnd(const asio::error_code& error, std::size_t bytes_transferred);
};
}
.cpp
#include "msgSrv.h"
namespace msgSrv {
endPoint::endPoint(const std::string ip, int port) {
asio::ip::address addr = asio::ip::address::from_string(ip);
ep = asio::ip::udp::endpoint(addr, port);
}
msgSrv::msgSrv(int listenPort) {
// TODO Auto-generated constructor stub
this->listenPort = listenPort;
try {
asioIoService = new asio::io_service();
asioSocket = new asio::ip::udp::socket(*asioIoService,
asio::ip::udp::endpoint(asio::ip::udp::v4(), listenPort)); //new asio::ip::udp::socket_(*asioIoService, udp::endpoint(udp::v4(), listenPort));
} catch (std::exception &e) {
std::cerr << "Error initializing ioservice or socket:" << e.what();
}
asioIoService->run();
}
msgSrv::~msgSrv() {
// TODO Auto-generated destructor stub
delete asioIoService;
delete asioSocket;
}
void msgSrv::start() {
asioSocket->async_receive_from(asio::buffer(rcvBuff), lastRcvdPcktEndp,
boost::bind(&msgSrv::pckRcvd, this, asio::placeholders::error,
asio::placeholders::bytes_transferred));
}
void msgSrv::pckRcvd(const asio::error_code& error,
std::size_t bytes_transferred) {
std::cout << "Rcvd! " << lastRcvdPcktEndp.address().to_string() << ":"
<< lastRcvdPcktEndp.port() << "\n";
}
void msgSrv::sendTo(const char* buff, int len, endPoint ep) {
sbuff = new char[len];
mempcpy(sbuff, buff, len);
asioSocket->async_send_to(asio::buffer(sbuff, len), ep.ep, boost::bind(
&msgSrv::sendHnd, this, asio::placeholders::error,
asio::placeholders::bytes_transferred));
}
void msgSrv::sendHnd(const asio::error_code& error,
std::size_t bytes_transferred) {
std::cout << "Snt!\n";
delete sbuff;
}
}
和以下“主”文件:
int main()
{
msgSrv::msgSrv aa(4450);
aa.start();
msgSrv::endPoint ep("127.0.0.1", 4450);
std::string a("Prova!");
int len = a.length();
aa.sendTo(a.c_str(), len, ep);
std::cout << "sent...\n";
std::cout << "notified...\n";
}
我得到的只有:
terminate called after throwing an instance of 'asio::system_error'
what(): mutex: Invalid argument
sent...
notified...
怎么了?我甚至尝试在主要部分放置一段时间(1),看看是否发生了什么......我甚至试图在接收处理程序解锁的主要条件中放置一个条件......所有都保持锁定...那么什么???不知道!
答案 0 :(得分:1)
我没有看到你实际锁定任何muxtex,所以这个错误很奇怪。
但是你的问题是在构造函数中调用asioIoService->run()
,这会陷入无限循环。解决方案是创建一个新的boost::thread,女巫调用asioIoService->run()
本身。该线程将处理所有作业。您也可以使用多个线程调用asio :: io_service :: run(),以便同时处理多个作业。
m_thread = new boost::thread(boost::bind(&asio::io_service::run,asioIoService));
调用asioIoService->stop()
将强制退出asio :: io_service :: run(),从而关闭线程。您必须加入此线程以确保线程在销毁msgSrv类的析构函数中的asioIoService
指针之前终止。