如何找到具有特定设备名称的蓝牙设备的端口名？

Question

如何找到具有特定设备名称的蓝牙设备的端口名？

我有以下代码，该代码枚举了所有蓝牙设备，但没有给我他们的端口名：

HBLUETOOTH_DEVICE_FIND founded_device;

BLUETOOTH_DEVICE_INFO device_info;
device_info.dwSize = sizeof(device_info);

BLUETOOTH_DEVICE_SEARCH_PARAMS search_criteria;
search_criteria.dwSize = sizeof(BLUETOOTH_DEVICE_SEARCH_PARAMS);
search_criteria.fReturnAuthenticated = TRUE;
search_criteria.fReturnRemembered = FALSE;
search_criteria.fReturnConnected = FALSE;
search_criteria.fReturnUnknown = FALSE;
search_criteria.fIssueInquiry = FALSE;
search_criteria.cTimeoutMultiplier = 0;

founded_device = BluetoothFindFirstDevice(&search_criteria, &device_info);

if(founded_device == NULL)
    return -1;

do {
    wstring ws = device_info.szName;
    cout << string(ws.begin(), ws.end()) << endl;

} while (BluetoothFindNextDevice(founded_device, &device_info));

然后，我得到了这段代码，该代码枚举了所有端口名称，但没有给我设备名称：

DWORD bytesNeeded = 0;
DWORD portCount = 0;

BOOL ret = EnumPorts(nullptr, 2, nullptr, 0, &bytesNeeded, &portCount);

BYTE *ports = new BYTE[bytesNeeded];

if(EnumPorts(nullptr, 2, (LPBYTE)ports, bytesNeeded, &bytesNeeded, &portCount))
{
    PORT_INFO_2 *portInfo = (PORT_INFO_2*)ports;

    for(DWORD i = 0; i < portCount; ++i)
        cout << portInfo[i].pPortName << endl;
}

delete [] ports;

启动我的应用程序时，我需要自动连接到特定设备，因此我需要在第一段代码中获取蓝牙设备的端口名，以便可以连接到该设备，或者在第二段代码中检查每个端口名代码，以确保连接之前是正确的设备。

我该怎么做？

Answer 1

我记得过去为此奋斗。 我发现的唯一解决方案是使用套接字通过其地址与蓝牙设备进行通信，然后使用send()和recv()方法与设备进行通信。

// assuming you have the BT device address in blueToothDeviceAddr;
char blueToothDeviceAddr[18];

SOCKET sock;
SOCKADDR_BTH sa = { 0,0,0,0 };
int sa_len = sizeof(sa);

// initialize windows sockets
WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD( 2, 0 );
if( WSAStartup( wVersionRequested, &wsaData ) != 0 ) 
{
    ExitProcess(100);
}

// parse the specified Bluetooth address

if( SOCKET_ERROR == WSAStringToAddress( blueToothDeviceAddr, AF_BTH, 
    NULL, (LPSOCKADDR) &sa, &sa_len ) ) 
{
        ExitProcess(101);
}

// query it for the right port

// create the socket
sock = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);
if( SOCKET_ERROR == sock ) 
{
    ExitProcess(102);
}

// fill in the rest of the SOCKADDR_BTH struct
GUID pService = (GUID)SerialPortServiceClass_UUID;
SOCKADDR_BTH outSA;
sa.port = SDPGetPort(blueToothDeviceAddr, (LPGUID) &pService,&outSA);
if( sa.port == 0 ) 
{
    ExitProcess(103);
}

// in case you have a pass code you need to register for authetication callback 
// look the web for this part

// connect to the device
if( SOCKET_ERROR == connect( sock, (LPSOCKADDR) &outSA, sa_len ) ) 
{
    int lastError = GetLastError();
    ExitProcess(105);
}

Answer 2

在键下： HKEY_LOCAL_MACHINE \\ SYSTEM \\ CurrentControlSet \\ Enum \\ BTHENUM，您可以找到一个子键，该子键具有包含设备地址的键列表。

在最后一个键下，您可以找到一个名为Device Parameters的子键，该子键最终具有PortName值。

该代码使用C ++和MFC库编写，并在Windows XP，7和10下进行了测试。希望对您有所帮助！

// Returns the outgoing COM port of a bluetooth device given by address
int GetBluetoothCOM( CString sAddr )
{
    int iPort = 0;

    HKEY hKey_1;
    DWORD KeyNdx_1 = 0;
    DWORD MaxKeyLen_1;
    char KeyNam_1[ MAX_PATH + 1 ];
    LONG RetVal_1;

    sAddr.MakeUpper();
    sAddr.Replace( ":", "" );
    sAddr.Replace( " ", "" );

    // Enumerate keys under: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\BTHENUM
    RegOpenKeyEx( HKEY_LOCAL_MACHINE, "SYSTEM\\CurrentControlSet\\Enum\\BTHENUM", NULL, KEY_READ | KEY_ENUMERATE_SUB_KEYS, &hKey_1 );

    while( true )
    {
        MaxKeyLen_1 = MAX_PATH;
        RetVal_1 = RegEnumKeyEx( hKey_1, KeyNdx_1, KeyNam_1, &MaxKeyLen_1, NULL, NULL, NULL, NULL );

        if( RetVal_1 == ERROR_NO_MORE_ITEMS )
        {
            break;
        }

        if( RetVal_1 == ERROR_SUCCESS )
        {
            HKEY hKey_2;
            DWORD KeyNdx_2 = 0;
            DWORD MaxKeyLen_2;
            char KeyNam_2[ MAX_PATH + 1 ];
            LONG RetVal_2;

            // Enumerate subkeys
            RegOpenKeyEx( HKEY_LOCAL_MACHINE, "SYSTEM\\CurrentControlSet\\Enum\\BTHENUM\\" + CString( KeyNam_1 ), NULL, KEY_READ | KEY_ENUMERATE_SUB_KEYS, &hKey_2 );

            while( true )
            {
                MaxKeyLen_2 = MAX_PATH;
                RetVal_2 = RegEnumKeyEx( hKey_2, KeyNdx_2, KeyNam_2, &MaxKeyLen_2, NULL, NULL, NULL, NULL );

                if( RetVal_2 == ERROR_NO_MORE_ITEMS )
                {
                    break;
                }

                if( RetVal_2 == ERROR_SUCCESS )
                {
                    // Find out if the key name contains &ADDRESS_
                    CString sKey = "SYSTEM\\CurrentControlSet\\Enum\\BTHENUM\\" + CString( KeyNam_1 ) + "\\" + CString( KeyNam_2 );

                    sKey.MakeUpper();

                    if( sKey.Find( "&" + sAddr + "_" ) != -1 )
                    {
                        HKEY hKey;
                        char szPort[ 100 + 1 ];
                        DWORD dwLen = 100;

                        // I find out the device
                        RegOpenKeyEx( HKEY_LOCAL_MACHINE, sKey + "\\Device Parameters", 0, KEY_READ, &hKey );
                        if( RegQueryValueEx( hKey, "PortName", NULL, NULL, ( LPBYTE ) &szPort, &dwLen ) == ERROR_SUCCESS )
                        {
                            szPort[ dwLen ] = 0;
                            CString sPort = CString( szPort );

                            sPort.MakeUpper();

                            if( sPort.Find( "COM" ) == -1 )
                            {
                                RegCloseKey( hKey );
                                continue;
                            }

                            sPort.Replace( "COM", "" );
                            sPort.Trim();

                            iPort = atoi( sPort.GetBuffer() );

                            if( iPort != 0 )
                            {
                                RegCloseKey( hKey );
                                break;
                            }
                        }
                        RegCloseKey( hKey );
                    }
                }

                ++KeyNdx_2;
            }

            RegCloseKey( hKey_2 );

            if( iPort != 0 )
            {
                break;
            }
        }

        ++KeyNdx_1;
    };

    RegCloseKey( hKey_1 );

    return iPort;
}