Menu
▾
▴
Re: [Libusb-win32-devel] Error in usb_bulk_read
|
From: Alexander E. <st...@st...> - 2006-07-25 06:40:45
|
Yes I' sure that the printer send data, because I can send the printer request
with the help of a terminal supplied by the manufacturer and see 1 char 0x06
(ACK) returned. Might 1 byte be a problem?
Ok, now it is possible that there are further printer or usb command send to the
firmware of the printer that force the printer to answer (anyhow a behavior that
sounds quite exceptional to me)
Isn't it possible that the printers answer is grabbed by the windows printing
system?
Can I use a usb-sniffer together with libusb. I read about snoopy, but didn't
manage to install it together with usblib. Either the printer disappears at
snoopy or in the output of TestLibUsb-win.exe.
Alexander
Stephan Meyer schrieb:
> bulk_read() worked correctly. It just timed out because
> your printer didn't send any data.
>
> Are you certain that your device actually has data to send
> when you issue the read request?
>
> Stephan
>
>
>> 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
|
