Question

如何找到具有特定设备名称的蓝牙设备的端口名称？

我有这段代码，它列举了所有蓝牙设备，但没有给我他们的端口名称：

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));

然后我有了这段代码，它列举了所有的端口名称，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;

当我的应用程序启动时，我需要自动连接到特定设备，所以我需要在第一段代码中获取蓝牙设备的端口名称，以便我可以连接到它，或检查每个端口名称第二段代码，以确保它在连接之前是正确的设备。

我该怎么做？

Answer 1

我记得过去曾经为此苦苦挣扎。我找到的唯一解决方案是使用套接字使用其地址与蓝牙设备通信，然后使用send()和recv()方法与设备通信。

// 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

关键：的 HKEY_LOCAL_MACHINE \ SYSTEM \ CURRENTCONTROLSET \枚举\ BTHENUM 你可以找到一个子密钥，其中包含一个包含设备地址的密钥列表。

在最后一个密钥下，您可以找到名为设备参数的子项，该子项最终具有 PortName 值。

代码是用C ++编写的，带有MFC库，并在Windows XP，7和10下测试过。我希望它可以帮到你！

// 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; }

如何找到具有特定设备名称的蓝牙设备的端口名称？

2 个答案: