如何找到具有特定设备名称的蓝牙设备的端口名称？

Question

如何找到具有特定设备名称的蓝牙设备的端口名称？

我有这样的代码，它枚举所有的蓝牙设备，但不给我自己的端口名称：

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，我有这样的代码，其中列举了所有的端口名称，但不给我设备名称：

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; 

我需要自动连接到特定的设备时，我的应用程序被启动，所以我需要在第一段代码要么获得端口名称的蓝牙设备，所以我可以连接到它，或者检查第二段代码中的每个端口名以确保它是th在连接到它之前，请右键单击设备。

我该怎么做？

Answer 1

我记得过去一直在苦苦挣扎。 我发现的唯一解决方案是使用套接字与使用其地址的蓝牙设备进行通信，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

下键： HKEY_LOCAL_MACHINE \系统\ CurrentControlSet \枚举\ BTHENUM 你可以找到它具有包含设备的地址密钥列表的子项。

在这最后的关键，你可以找到一个名为设备参数子项，其终于有了PORTNAME值。

该代码是用MFC库编写的，并在Windows XP，7和10下进行了测试。我希望它能帮助你！

// 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; 
}