java - 使用 jusbpmp lib 时出错

Question

我正在尝试用 Java 访问 USB 端口。我正在使用 Jusbpmp 0.1.5 和 Java 1.7.0_45。我尝试在 Mac OS X 中测试它，但出现以下错误。

java.lang.Exception: Unknown OS

at jpmp.manager.DeviceManager.loadPmpLib(Unknown Source)
at jpmp.manager.DeviceManager.<init>(Unknown Source)
at jpmp.manager.DeviceManager.getInstance(Unknown Source)
at USB.main(USB.java:12)

这是我的代码:

import java.util.Iterator;
import java.util.LinkedList;
import jpmp.device.UsbDevice;
import jpmp.manager.DeviceManager;
import jpmp.notifier.IDeviceTransferNotifier;
import jpmp.notifier.IParseTreeNotifier;

public class USB {
    public static void main(String[] args) {
       try{
           DeviceManager dm = DeviceManager.getInstance();
           dm.createInstance();
           dm.scanDevices();
           Iterator it = dm.getDeviceList().keySet().iterator();
           String devkey = (String)it.next();
           UsbDevice usbdev = (UsbDevice)dm.getDeviceList().get(devkey);
            System.out.println(usbdev.dump());
      }catch(Exception e){
          e.printStackTrace();
      } catch (Throwable e) {
          e.printStackTrace();
      }
  }
   //USB 연결확인 함수
   static boolean isConnected(String filterProductName, String filterProductid, String filterVendorid){
       try {

           DeviceManager dm;
           dm = DeviceManager.getInstance();
           dm.createInstance();
           dm.scanDevices();

           if (dm.getDeviceList() != null && dm.getDeviceList().size() > 0) {
               for (Iterator it = dm.getDeviceList().keySet().iterator(); it.hasNext();) {
                   String devkey = (String) it.next();
                   UsbDevice usbdev = (UsbDevice) dm.getDeviceList().get(devkey);
                   if ((usbdev.getPid().equals(filterProductid) && usbdev.getVid().equals(filterVendorid)) || usbdev.getName().equals(filterProductName)) {
                       return true;
                   }
               }
           }
       } catch (Throwable ex) {
           ex.printStackTrace();
       }
       return false;
   } 
   //USB 파일전송 함수
   static void TransUsb() throws Throwable{
       DeviceManager dm = DeviceManager.getInstance();
       dm.createInstance();
       dm.scanDevices();

       String filterProductid = "0x2211";  //productid
       String filterVendorid = "0x0ea0";   //vendorid 

       UsbDevice usbdevFound = null; 
       if (dm.getDeviceList() != null  && dm.getDeviceList().size()>0){
           for ( Iterator it = dm.getDeviceList().keySet().iterator(); it.hasNext(); ){
               String devkey = (String)it.next();
               UsbDevice usbdev = (UsbDevice)dm.getDeviceList().get(devkey);
               if (usbdev.getPid().equals(filterProductid) && usbdev.getVid().equals(filterVendorid)){
                   usbdevFound = usbdev;

               }
           }
       }

       if (usbdevFound != null) {
           String fileToSend = "C:\\videofile.avi";
           usbdevFound.sendFile(fileToSend, "/Video", null, null);
       }

       dm.releaseInstance();
   } 
}

错误发生在线路上:

DeviceManager dm = DeviceManager.getInstance();

Answer 1

引用自jusbpmp home page (强调我的):

Jusbpmp is a Java library that allows to communicate with portable USB players (supporting MSC or MTP) on Linux or Windows.

看来这个库不适用于 Mac OS。

另一种方法是使用 usb4java ，明确支持 Linux、OS X 和 Windows:

Supported platforms are Linux (x86 32/64 bit, ARM 32 bit), OS X (x86 32/64 bit) and Windows (x86 32/64 bit). But other platforms may work as well (as long as they have at least Java 6 and are supported by libusb) by compiling the JNI library manually.