Question

这是我的发送程序。

#pragma once
#pragma comment(lib,"Ws2_32.lib")

#include <WinSock2.h>
#include <Windows.h>
#include <iostream>

using namespace std;

int main()
{
    WSAData wsaData;
    WORD DllVersion = MAKEWORD(2,2);
    int startup_RetVal = WSAStartup(DllVersion, &wsaData);

    SOCKET sSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

    SOCKADDR_IN addr;

    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    addr.sin_family = AF_INET;
    addr.sin_port = htons(22222);

    char buf[200000] = "AR*REF=";

    int send_RetVal = sendto(sSocket, buf, 200000, NULL, (SOCKADDR*)&addr, sizeof(addr));
    if(send_RetVal == SOCKET_ERROR)
    {
        cout <<" An error occured " << WSAGetLastError() << endl;
        getchar();
    }

    return 0;
}

我收到WSAEMSGSIZE（10040）错误。

目标是通过udp发送100Kbytes文件。有人告诉我，.NET上的类似错误就是这样解决的：

IPHostEntry^ IPHostTV;

IPEndPoint^ send_tv_ip;

Socket^ UDPSendTV;

int PortSendTV;
System::String^ IPSend;



send_tv_ip =
gcnew IPEndPoint(IPHostTV->AddressList[0], PortSendTV);

UDPSendTV =
gcnew Socket(send_tv_ip->Address->AddressFamily, SocketType::Dgram, ProtocolType::Udp);

//Increasing buffer and timeout
UDPSendTV->SendTimeout = 1000;
UDPSendTV->SendBufferSize = 100000;

UDPSendTV->SendTo(buff1, 0, size1, SocketFlags::None, send_tv_ip);

如何修改套接字以使其正常工作？

Answer 1

UDP标题中的16位消息大小字段将UDP上的消息大小限制为~64KB。没有解决方法。

（除了每个协议单元发送多条消息外）。

Winsock UDP文件发送错误10040

1 个答案: