Hi al,
I call usb_bulk_write to write data to usb printer, code as following:
usb_claim_interface(usbdev,0);
int fd_prt;
fd_prt = open("/tmp/printout", O_RDONLY);
if (fd_prt < 0) return -1;
int rtnvalue = 0;
int rtnwrite = 0;
char buf_prt[0x1000] = {0};
while(rtnvalue=read(fd_prt, buf_prt, 0x1000) > 0)
{
rtnwrite = usb_bulk_write(usbdev, 0x01, buf_prt, 0x1000, timeout);
printf("return value of usb_bulk_write = %d\n", rtnwrite);
if (rtnwrite < 0)
printf("error in writing data to usb printer, err: %s\n",
strerror(errno));
}
usb_release_interface(usbdev, 0);
close(fd_prt);
return 0;
here, /tmp/printout is the file(source file is jpg) converted in print language
format, that is, using cat command could print out the correct image.
like this: cat /tmp/printout > /dev/usb/lp0.
Now I using libusb to write the data to usb printer directly, the printer only print
part of the file and then come into a confusion status, result is showed as following:
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
error writing to bulk endpoint 1: Connection timed out
return value of usb_bulk_write = -1
error in writing data to usb printer, err: Connection timed out
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
return value of usb_bulk_write = 4096
error writing to bulk endpoint 1: Connection timed out
return value of usb_bulk_write = -1
error in writing data to usb printer, err: Connection timed out
error writing to bulk endpoint 1: Connection timed out
return value of usb_bulk_write = -1
error in writing data to usb printer, err: Connection timed out
error writing to bulk endpoint 1: Connection timed out
return value of usb_bulk_write = -1
error in writing data to usb printer, err: Connection timed out
why connection timed out error come out, while first writings are ok?
BTW, TIMEOUT I set is 5000ms
what should I do?
thanks in advance!
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