It sounds like the device is sending you a 0-length packet. It could
be part of its protocol. Maybe you should try a second buffer?
Also, you're sending that on an input-direction pipe, do you realize
that? You seem to be trying to send a command out to the device,
since you're formatting the data. The data will just be overwritten
though.
For input-direction pipes you should just have a dedicated Thread to
manage the input or use multiple UsbIrps asynchronously and re-submit
the UsbIrp (or a new one) in a UsbPipeListener.
On 10/26/06, David A Scott <[EMAIL PROTECTED]> wrote:
> Hi, all. Could somebody help me out here? I'm pulling my hair out on
> this one...
>
> After finding my device, claiming the interface, grabbing an endpoint, and
> opening a pipe, I try to send 30 bytes down the pipe (see JUnit test below).
>
> The output says:
>
> device = PowerShot G2
> Sending 30 bytes
> return code (expected=30,actual=0)
>
> I expect to see 30 bytes transferred, but I see 0.
>
> There are no exceptions thrown. For grins, I tried the other two endpoints,
> but they both block forever.
>
> My real question is: Why would I get a "successful" completion (no
> exceptions)
> but get zero bytes transferred? Am I doing something wrong here?
>
> Thanks,
>
> --dave;
>
> ===========================================================
>
> import java.util.ArrayList;
> import java.util.Collections;
> import java.util.Iterator;
> import java.util.List;
>
> import javax.usb.UsbConfiguration;
> import javax.usb.UsbDevice;
> import javax.usb.UsbEndpoint;
> import javax.usb.UsbHostManager;
> import javax.usb.UsbHub;
> import javax.usb.UsbInterface;
> import javax.usb.UsbPipe;
>
> import junit.framework.TestCase;
>
> public class SendToUsbDeviceTest extends TestCase {
>
> UsbDevice device;
>
> public void testSend() throws Exception {
> List<UsbDevice> devices =
> findAddressableDevices(UsbHostManager.getUsbServices().getRootUsbHub());
>
> Iterator it = devices.iterator();
> while (it.hasNext()) {
> // find my camera
> if ((device =
> (UsbDevice)it.next()).getProductString().contains("G2"))
> break;
> }
> System.out.println("device = " + device.getProductString());
>
> UsbConfiguration config = device.getActiveUsbConfiguration();
> UsbInterface intf = config.getUsbInterface((byte)0);
> intf.claim();
> UsbEndpoint endp = intf.getUsbEndpoint((byte)0x83);
> UsbPipe pipe = endp.getUsbPipe();
> pipe.open();
>
> byte[] data = new byte[] {
> (byte) 0x10, (byte) 0x01, (byte) 0x00, (byte) 0x00,
> (byte) 0x00, (byte) 0x00,
> (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
> (byte) 0x00, (byte) 0x00,
> (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
> (byte) 0x00, (byte) 0x00,
> (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
> (byte) 0x00, (byte) 0x00,
> (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
> (byte) 0x00, (byte) 0x00 };
>
> System.out.println("Sending 30 bytes");
> int returnCode = pipe.syncSubmit(data);
> System.out.println("return code (expected=30,actual=" +
> returnCode + ")");
> assertEquals("check return code from syncSubmit", 30, returnCode);
> }
>
> public List<UsbDevice> findAddressableDevices(UsbDevice parent) {
> List<UsbDevice> devices = new ArrayList<UsbDevice>();
> if (parent.isUsbHub()) {
> List children = ((UsbHub) parent).getAttachedUsbDevices();
> Iterator it = children.iterator();
> while (it.hasNext()) {
> UsbDevice child = (UsbDevice) it.next();
> List<UsbDevice> childsDevices =
> findAddressableDevices(child);
> Iterator childIterator = childsDevices.iterator();
> while (childIterator.hasNext()) {
> UsbDevice d = (UsbDevice) childIterator.next();
> if (!d.isUsbHub())
> devices.add(d);
> }
> }
> } else {
> devices.add(parent);
> }
> return Collections.unmodifiableList(devices);
> }
> }
>
>
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