用socket写蓝牙通信的时候遇到accept不阻塞的情况

Question

socket中accept不阻塞的问题，网上的方法不起作用

最近比赛需要，要用到蓝牙通信。我打算用套接字实现，但是在写套接字的程序的时候，accept总是不阻塞，检查发现错误码10014，但是长度也没问题，实在不知道怎么回事了。时间比较急，那位大神懂行的还请帮忙指点一下，感激不尽！

#include <iostream>
#include <cstring>

#include <winsock2.h>
#pragma comment(lib,"Ws2_32.lib")
#include <ws2bth.h>

#include <bthsdpdef.h>
#include <bluetoothapis.h>
#pragma comment(lib, "bthprops.lib")

int main() {
    WSADATA wsaData;
    int err = WSAStartup(MAKEWORD(2, 2), &wsaData) ;
    std::cout <<"startup return: " <<  err << std::endl;
    SOCKET sock = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);
    if (sock == SOCKET_ERROR) {
        std::cout << "sock define error !" << std::endl;
    }
    SOCKADDR_BTH bt_addr;
    bt_addr.addressFamily = AF_BTH;
    bt_addr.port = BT_PORT_ANY;
    bt_addr.btAddr = 0;
    bt_addr.serviceClassId = GUID_NULL;
    std::cout << WSAGetLastError() << std::endl;

    err = ::bind(sock, (sockaddr*)&bt_addr, sizeof(bt_addr));
    std::cout << WSAGetLastError() << std::endl;
    std::cout << "bind return :" <<err<< std::endl;
    int l = sizeof(bt_addr);
    std::cout <<"get sockname return: "<< getsockname(sock, (sockaddr*)&bt_addr, &l) << std::endl;

    err = listen(sock, 1);
    std::cout << "lis_return: " << err << std::endl;

    SOCKADDR clntAddr;
    int l1 = sizeof(SOCKADDR);;
    std::cout << l1 << std::endl;
    SOCKET clntSock = accept(sock, (SOCKADDR*)&clntAddr, &l1);
    if (err = WSAGetLastError()) {
        std::cout << "阻塞出错。" << std::endl;
        std::cout << "错误码：" << err << std::endl;
    }
    closesocket(clntSock);
    closesocket(sock);
    WSACleanup();

    return 0;
}

Answer 1

https://blog.csdn.net/weixin_42424269/article/details/100574576