Hello everybody,
after two days I'm quite happy with the integration of a usb printer into my
application. I can write to the printer but not read from. I'v to say that I'm
new to USB. The error happens when i call usb_bulk_read(...)
Version:
DLL version: 0.1.10.1
Driver version: 0.1.10.1
Following informations ...
1) Application code
2) Stdout of application
3) Output of TestLibUsb-win.exe
4) Output of Dbgview
I hope anybody can give me a hint
1) -- code of my application
struct usb_bus *bus;
int c, i, a;
/* ... */
for (bus = busses; bus; bus = bus->next) {
struct usb_device *dev;
for (dev = bus->devices; dev; dev = dev->next) {
/* Check if this device is a printer */
if (dev->descriptor.bDeviceClass == 7)
{
/* Open the device, claim the interface and do your processing */
cout << "+++++" << endl;
}
/* Loop through all of the configurations */
for (c = 0; c < dev->descriptor.bNumConfigurations; c++)
{
/* Loop through all of the interfaces */
for (i = 0; i < dev->config[c].bNumInterfaces; i++)
{
/* Loop through all of the alternate settings */
for (a = 0; a < dev->config[c].interface[i].num_altsetting; a++)
{
/* Check if this interface is a printer */
if (dev->config[c].interface[i].altsetting[a].bInterfaceClass == 7)
{
/* Open the device, set the alternate setting, claim the interface
and do your processing */
usb_set_debug(255);
usb_dev_handle* aH;
void *context0 = NULL;
int aRc = 0;
aH = usb_open(dev);
aRc = usb_set_configuration(aH, 1);
if (usb_claim_interface(aH, 0))
{
cout << "Error usb_claim_interface" << endl;
return;
}
int aNumBytes = 0;
char aBuf[64*20+11];
int aSz = sizeof(aBuf);
memset(aBuf, 0, aSz );
SetLastError(0);
// ---- Write ----
aNumBytes = usb_bulk_write(aH, 0x06, "MI\r", 3, 1000);
if (aNumBytes < 0) {
} else {
cout << aNumBytes << " Bytes written" << endl;
}
// --- Read ---
SetLastError(0);
aNumBytes = usb_bulk_read(aH, 0x85, aBuf, aSz, 1000);
if (aNumBytes < 0) {
cout << "Error usb_bulk_read: " << aNumBytes << endl;
DWORD aErr = GetLastError();
printf("%s (%d)\n", usb_strerror(), aErr);
}
aRc = usb_release_interface(aH, 0);
aRc = usb_reset(aH);
aRc = usb_close(aH);
cout << "----- Sucess -----" << endl
}
}
}
}
}
}
2) --- stdout
found 1 busses
usb_set_debug: Setting debugging level to 255 (on)
3 Bytes written
LIBUSB_DLL error: usb_reap_async: timeout error
Error usb_bulk_read: -116
usb_reap_async: timeout error (2)
----- Sucess -----
3) --- what TestLibUsb-win.exe reports
bus-0/\\.\libusb0-0001--0x0a5f-0x4e00 0A5F/4E00
- Manufacturer : Eltron
- Product : P330i
- Serial Number: P330009314
wTotalLength: 32
bNumInterfaces: 1
bConfigurationValue: 1
iConfiguration: 86
bmAttributes: c0h
MaxPower: 0
bInterfaceNumber: 0
bAlternateSetting: 0
bNumEndpoints: 2
bInterfaceClass: 7
bInterfaceSubClass: 1
bInterfaceProtocol: 2
iInterface: 132
bEndpointAddress: 85h
bmAttributes: 02h
wMaxPacketSize: 64
bInterval: 0
bRefresh: 0
bSynchAddress: 0
bEndpointAddress: 06h
bmAttributes: 02h
wMaxPacketSize: 64
bInterval: 0
bRefresh: 0
bSynchAddress: 0
4) ---- And finally output of Dbgview
LIBUSB-DRIVER - release_interface(): releasing all interfaces
LIBUSB-DRIVER - set_configuration(): configuration 1
LIBUSB-DRIVER - set_configuration(): timeout 5000
LIBUSB-DRIVER - get_descriptor(): buffer size 18
LIBUSB-DRIVER - get_descriptor(): type 0001
LIBUSB-DRIVER - get_descriptor(): index 0000
LIBUSB-DRIVER - get_descriptor(): language id 0000
LIBUSB-DRIVER - get_descriptor(): timeout 5000
LIBUSB-DRIVER - get_descriptor(): buffer size 9
LIBUSB-DRIVER - get_descriptor(): type 0002
LIBUSB-DRIVER - get_descriptor(): index 0000
LIBUSB-DRIVER - get_descriptor(): language id 0000
LIBUSB-DRIVER - get_descriptor(): timeout 5000
LIBUSB-DRIVER - get_descriptor(): buffer size 32
LIBUSB-DRIVER - get_descriptor(): type 0002
LIBUSB-DRIVER - get_descriptor(): index 0000
LIBUSB-DRIVER - get_descriptor(): language id 0000
LIBUSB-DRIVER - get_descriptor(): timeout 5000
LIBUSB-DRIVER - set_configuration(): interface 0 found
LIBUSB-DRIVER - update_pipe_info(): interface 0
LIBUSB-DRIVER - update_pipe_info(): endpoint address 0x85
LIBUSB-DRIVER - update_pipe_info(): endpoint address 0x06
LIBUSB-DRIVER - claim_interface(): interface 0
LIBUSB-DRIVER - transfer(): bulk or interrupt transfer
LIBUSB-DRIVER - transfer(): direction out
LIBUSB-DRIVER - transfer(): endpoint 0x06
LIBUSB-DRIVER - transfer(): size 3
LIBUSB-DRIVER - transfer_complete(): 3 bytes transmitted
LIBUSB-DRIVER - transfer(): bulk or interrupt transfer
LIBUSB-DRIVER - transfer(): direction in
LIBUSB-DRIVER - transfer(): endpoint 0x85
LIBUSB-DRIVER - transfer(): size 1291
LIBUSB-DRIVER - transfer_cancel(): timeout error
[2772] LIBUSB_DLL error: usb_reap_async: timeout error
LIBUSB-DRIVER - release_interface(): interface 0
LIBUSB-DRIVER - reset_device()
Regards
Alexander
|
