与设备通信Usb4java错误

Question

这里需要你的帮助。

我目前正在开发能够与ingenico iWL220设备通信的Java应用程序，使用来自libusb库的usb4java。我安装了驱动程序，它可以从设备管理器读取很好。我主要遵循以下代码

http://www.mets-blog.com/java-usb-communication-usb4java/用于低API。

高级API的http://www.mets-blog.com/java-usb-communication-usb4java-high-api/。

我尝试的第一个是低API，我的主要类如下：

public class DeviceHandles {
private static final Short VendorID = 0x079b;
private static final Short ProductID = 0x0028;    
public static void main(String[] args){
UsbLowPos upos = new UsbLowPos();
upos.claimDevice(VendorID,ProductID);
   }
}

这个返回时有一个错误：

Device Found 
Exception in thread "main" org.usb4java.LibUsbException: USB error 12: Unable to open USB device: Operation not supported or unimplemented on this platform     at Usb.UsbLowPos.getDeviceHandle(UsbLowPos.java:121)    at Usb.UsbLowPos.findDevice(UsbLowPos.java:103)     at Usb.UsbLowPos.claimDevice(UsbLowPos.java:27)     at Usb.DeviceHandles.main(DeviceHandles.java:24)

之后，我尝试了High，我的主要类如下：

public class DeviceHandles {
private static final Short VendorID = 0x079b;
private static final Short ProductID = 0x0028;
public static void main(String[] args){
UsbHighPos upos = new UsbHighPos();
UsbDevice usbDevice = upos.findDevice(VendorID,ProductID);
upos.readMessage(upos.getDeviceInterface(usbDevice, 0), 0);  
   }
}

它还返回错误为：

javax.usb.UsbException: Properties file javax.usb.properties not found.     at javax.usb.UsbHostManager.setupProperties(Unknown Source)     at javax.usb.UsbHostManager.getProperties(Unknown Source)   at javax.usb.UsbHostManager.createUsbServices(Unknown Source)   at javax.usb.UsbHostManager.getUsbServices(Unknown Source)  at Usb.UsbHighPos.getUsbRootHoob(UsbHighPos.java:29)    at Usb.UsbHighPos.findDevice(UsbHighPos.java:43)    at Usb.DeviceHandles.main(DeviceHandles.java:27) Exception in thread "main" java.lang.NullPointerException  at Usb.UsbHighPos.findDevice(UsbHighPos.java:49)    at Usb.UsbHighPos.findDevice(UsbHighPos.java:43)    at Usb.DeviceHandles.main(DeviceHandles.java:27)

我是不是漏掉了什么？是图书馆无法与设备通信吗？或者可能是设备的问题？请帮忙，谢谢你抽出时间来。

Answer 1

这个问题解决了，我用代替了它，而且它工作得很好！