啷哩个小吒吒
2018-01-19 10:00
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java RXTX做串口通信,怎么唯一确定某个设备的串口?

由于串口号是系统分配的,更换接口串口号会变动,C++是可以获取串口驱动供应商的,java怎么获取?

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2条回答 默认 最新

  • threenewbee 2018-01-19 15:37
    已采纳

    https://stackoverflow.com/questions/6362775/getting-device-driver-information-related-to-a-com-port

     Example
    String keyPath = "SYSTEM\\CurrentControlSet\\Enum\\USB\\Vid_067b&Pid_2303\\";
    String device1 = "5&75451e6&0&1";
    System.out.println("First COM device: " + getComNumber(keyPath + device1));
    
    Code
    import java.util.regex.Pattern;
    import java.util.regex.Matcher;
    
    // Given a registry key, attempts to get the 'FriendlyName' value
    // Returns null on failure.
    //
    public static String getFriendlyName(String registryKey) {
        if (registryKey == null || registryKey.isEmpty()) {
            throw new IllegalArgumentException("'registryKey' null or empty");
        }
        try {
            int hkey = WinRegistry.HKEY_LOCAL_MACHINE;
            return WinRegistry.readString(hkey, registryKey, "FriendlyName");
        } catch (Exception ex) { // catch-all: 
            // readString() throws IllegalArg, IllegalAccess, InvocationTarget
            System.err.println(ex.getMessage());
            return null;
        }
    }
    
    // Given a registry key, attempts to parse out the integer after
    // substring "COM" in the 'FriendlyName' value; returns -1 on failure.
    //
    public static int getComNumber(String registryKey) {
        String friendlyName = getFriendlyName(registryKey);
    
        if (friendlyName != null && friendlyName.indexOf("COM") >= 0) {
            String substr = friendlyName.substring(friendlyName.indexOf("COM"));
            Matcher matchInt = Pattern.compile("\\d+").matcher(substr);
            if (matchInt.find()) {
                return Integer.parseInt(matchInt.group());
            }
        }
        return -1;
    }   
    
    
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