如何将蓝牙地址格式化为 btaddr？

Question

我有一个蓝牙地址 (7C9EBD4CBFB2)，需要使用 winsock 连接。这是我的代码，returns 错误为 -1，无法连接到我的设备。

#include <winsock2.h>
#include <ws2bth.h>
#pragma comment(lib, "Ws2_32.lib")
#include <Windows.h>
#include <iostream>
using namespace std;
SOCKADDR_BTH sockAddr;
SOCKET btSocket;
int error;

int main() {
    btSocket = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);
    memset(&sockAddr, 0, sizeof(sockAddr));
    sockAddr.addressFamily = AF_BTH;
    sockAddr.serviceClassId = RFCOMM_PROTOCOL_UUID;
    sockAddr.port = BT_PORT_ANY;
    sockAddr.btAddr = 0x7C9EBD4CBFB2;
    error = connect(btSocket, (SOCKADDR*)&sockAddr, sizeof(sockAddr));
    cout << error;
}

如何格式化它以用作 btaddr？谢谢

Answer 1

您没有在 socket() 之前致电 WSAStartup()。如果您一直在进行更好的错误检查，您会更快地意识到这一点。参见 Handling Winsock Errors。

socket() 会返回 INVALID_SOCKET (-1)，然后 WSAGetLastError() 会返回 WSANOTINITIALISED (10093)。

Successful WSAStartup not yet performed.

Either the application has not called WSAStartup or WSAStartup failed. The application may be accessing a socket that the current active task does not own (that is, trying to share a socket between tasks), or WSACleanup has been called too many times.

然后 connect() 会失败 SOCKET_ERROR (-1)，WSAGetLastError() 会返回 WSAENOTSOCK (10038)。

Socket operation on nonsocket.

An operation was attempted on something that is not a socket. Either the socket handle parameter did not reference a valid socket, or for select, a member of an fd_set was not valid.

根据 Bluetooth Programming with Windows Sockets 文档：

As with all Windows Sockets application programming, the WSAStartup function must be called to initiate Windows Sockets functionality and enable Bluetooth.

始终检查系统调用的错误代码！

试试像这样的东西：

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

int str2ba(const char *straddr, BTH_ADDR *btaddr)
{
    int i;
    unsigned int aaddr[6];
    BTH_ADDR tmpaddr = 0;

    if (std::sscanf(straddr, "%02x:%02x:%02x:%02x:%02x:%02x",
                    &aaddr[0], &aaddr[1], &aaddr[2],
                    &aaddr[3], &aaddr[4], &aaddr[5]) != 6)
        return 1;
    *btaddr = 0;
    for (i = 0; i < 6; i++) {
        tmpaddr = (BTH_ADDR) (aaddr[i] & 0xff);
        *btaddr = ((*btaddr) << 8) + tmpaddr;
    }
    return 0;
}

int main() {
    WSADATA wsa;
    memset(&wsa, 0, sizeof(wsa));

    int error = WSAStartup(MAKEWORD(2,2), &wsa);
    if (error != 0) {
        std::cerr << "WSAStartup() failed, error: " << error;
        return -1;
    }

    SOCKET btSocket = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);
    if (btSocket == INVALID_SOCKET) {
        error = WSAGetLastError();
        std::cerr << "socket() failed, error: " << error;
        WSACleanup();
        return -1;
    }

    SOCKADDR_BTH sockAddr;
    memset(&sockAddr, 0, sizeof(sockAddr));
    sockAddr.addressFamily = AF_BTH;
    sockAddr.serviceClassId = RFCOMM_PROTOCOL_UUID;
    sockAddr.port = BT_PORT_ANY;
    str2ba("7C:9E:BD:4C:BF:B2", &sockAddr.btAddr);

    if (connect(btSocket, (SOCKADDR*)&sockAddr, sizeof(sockAddr)) == SOCKET_ERROR) {
        error = WSAGetLastError();
        std::cerr << "connect() failed, error: " << error;
        closesocket(btSocket);
        WSACleanup();
        return -1;
    }

    // use btSocket as needed...

    closesocket(btSocket);
    return 0;
}

如何将蓝牙地址格式化为 btaddr？

How do I format an bluetooth address as a btaddr?

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