对于Windows系统,我不确定设置TCP_NODELAY是否有帮助。我尝试过了,但延迟仍然很高。有人建议我尝试使用UDP,而那确实解决了问题。
一些复杂的UDP示例对我来说并没有起作用,但我找到了一个简单的示例,它解决了问题...
#include <Winsock2.h>
#include <WS2tcpip.h>
#include <system_error>
#include <string>
#include <iostream>
class WSASession
{
public:
WSASession()
{
int ret = WSAStartup(MAKEWORD(2, 2), &data);
if (ret != 0)
throw std::system_error(WSAGetLastError(), std::system_category(), "WSAStartup Failed");
}
~WSASession()
{
WSACleanup();
}
private:
WSAData data;
};
class UDPSocket
{
public:
UDPSocket()
{
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock == INVALID_SOCKET)
throw std::system_error(WSAGetLastError(), std::system_category(), "Error opening socket");
}
~UDPSocket()
{
closesocket(sock);
}
void SendTo(const std::string& address, unsigned short port, const char* buffer, int len, int flags = 0)
{
sockaddr_in add;
add.sin_family = AF_INET;
add.sin_addr.s_addr = inet_addr(address.c_str());
add.sin_port = htons(port);
int ret = sendto(sock, buffer, len, flags, reinterpret_cast<SOCKADDR *>(&add), sizeof(add));
if (ret < 0)
throw std::system_error(WSAGetLastError(), std::system_category(), "sendto failed");
}
void SendTo(sockaddr_in& address, const char* buffer, int len, int flags = 0)
{
int ret = sendto(sock, buffer, len, flags, reinterpret_cast<SOCKADDR *>(&address), sizeof(address));
if (ret < 0)
throw std::system_error(WSAGetLastError(), std::system_category(), "sendto failed");
}
sockaddr_in RecvFrom(char* buffer, int len, int flags = 0)
{
sockaddr_in from;
int size = sizeof(from);
int ret = recvfrom(sock, buffer, len, flags, reinterpret_cast<SOCKADDR *>(&from), &size);
if (ret < 0)
throw std::system_error(WSAGetLastError(), std::system_category(), "recvfrom failed");
buffer[ret] = 0;
return from;
}
void Bind(unsigned short port)
{
sockaddr_in add;
add.sin_family = AF_INET;
add.sin_addr.s_addr = htonl(INADDR_ANY);
add.sin_port = htons(port);
int ret = bind(sock, reinterpret_cast<SOCKADDR *>(&add), sizeof(add));
if (ret < 0)
throw std::system_error(WSAGetLastError(), std::system_category(), "Bind failed");
}
private:
SOCKET sock;
};
服务器
#define TRANSACTION_SIZE 8
static void startService(int portNumber)
{
try
{
WSASession Session;
UDPSocket Socket;
char tmpBuffer[TRANSACTION_SIZE];
INPUT input;
input.type = INPUT_MOUSE;
input.mi.mouseData=0;
input.mi.dwFlags = MOUSEEVENTF_MOVE;
Socket.Bind(portNumber);
while (1)
{
sockaddr_in add = Socket.RecvFrom(tmpBuffer, sizeof(tmpBuffer));
...do something with tmpBuffer...
Socket.SendTo(add, data, len);
}
}
catch (std::system_error& e)
{
std::cout << e.what();
}
客户端
char *targetIP = "192.168.1.xxx";
Socket.SendTo(targetIP, targetPort, data, len);