Dan,
Thanks for your replay.
I think the point is in this part of code:
try{
UsbIrp irp = usbPipe.createUsbIrp( );
FileInputStream inStream=new
FileInputStream("/root/workspace/fwdl-java/test.txt");
byte[] buffer =new byte[maxPacketSize];
irp.setData(buffer);
while ((iReadnum = inStream.read(buffer)) != -1) {
usbPipe.syncSubmit(irp);
irp.setComplete(false);
}
} catch (UsbException uE) {
System.out.println("Unable to submit data buffer to HID
mouse : " + uE.getMessage());
}
catch(Exception e)
{
}
I have debug this code, no exception has been thrown out. And the
"syncSubmit(irp)" function has no return value. The actual length of the irp
data is correct, and there is no irp exception either.
I changed the buffer size to 1024, but the result was the same. Every time
about 77 bytes' data was printed out. The whole file is about 3k.
I do not know "submit multiple times" is right or not? However, it seems to
work, as I have printed two buffers content to one page(one buffer 64 bytes).
I have tried to submit the whole file in one time , but the result was still
the same.
Maybe as you said, the problem is something with the protocol. On windows ,I
treat the printer device as a file and write data into it, so I have no sense
to care about the protocol.
Any other advice from you?
Ric
Best Regards.
-----Original Message-----
From: Dan Streetman
Sent: Wednesday, November 07, 2007 1:13 PM
To: Xie, Ric
Cc: javax-usb-devel@lists.sourceforge.net
Subject: Re: [javax-usb-devel] Write to the printer!
You didn't mention whether you know what your printer protocol is and
know you are using it correctly, or if you are completely guessing
about the protocol. If you don't know the protocol, I can't help you,
as I think most printer protocols are rather complicated.
However, I'll assume that you know your protocol and are using it
correctly. I suggest to use larger buffers; with bulk you are not
limited to the max packet size. Try 1k or more. Also, you may want
to use async instead of sync. Finally, are you calling submit
multiple times? You only said basically "it didn't work" but did not
elaborate at all. Are you reading the entire file? Is there an
exception? What is the return value from the submission (including
the irp exception if any, the irp transferred length, etc)? You
aren't checking any status from the submission.
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