Re: Libusb-win32 code to control Ricoh Theta

Hi,
the trailing 0x00 was just a guess since often text strings are "zero
terminated". I dont have any closer information about what you are doing,
sorry.
If you have a sample program that can trigger the capture, you may try to
use "UsbSnoop" to see the data transmitted.

http://sourceforge.net/projects/usbsnoop/

Best regards
Ekkehard


Kevin Cain wrote
> Thank you for your suggestions, Ekkehard,
> 
> The 'memset(buffer, 0, 64)' command I send should fill the buffer with '0'
> values, unless I'm making a fundamental error.  I will try your variants.
>  Your suggestion that the camera may require a trailing '0' is interesting
> -- I will try that as well, is there any reference to support that?
> 
> I suspect my problem is in correctly deducing the parameters required to
> send messages to the Theta via libusb, e.g.:
> 
> *int usb_control_msg(usb_dev_handle *dev, int requesttype, int request,
> int
> value, int index, char *bytes, int size, int timeout);*
> 
> I used USBTrace to detect the Ricoh-provided driver and uploaded the
> results here:
> www.insightdigital.org/Ricoh_Theta_Device_Log_USBTrace.html
> 
> However, I don't yet see how to find the request details for the camera in
> question.  I assume this comes up each time a programmer wishes to control
> a new device with libusb -- are there any resources that might help me?
> 
> Any help divining the correct syntax and message protocol parameters would
> be wonderful.
> 
> Thanks,
> 
> -Kevin
> 
> 
> On Sun, Jul 20, 2014 at 3:25 AM, Ekkehard <

> edomning@

> >
> wrote:
> 
>> Hi,
>> I have'nt done anything with the camara matter. From the programmers
>> view,
>> there is one thing I dont understand.
>> The used bytes the buffer are only  15 = "trigger-capture", but you are
>> sending 64 bytes. If the command detection algo in the camera validating
>> the
>> length of the buffer first, than the command will not be recognised.
>> So maybe you can try
>> int result = usb_control_msg(devHandle, 0x21, 9, 0x2, 0x0, (char*)buffer,
>> 15, 100); if (result == 15) cout << "Successfully sent all bytes to
>> camera"
>> << endl;
>> or, if the camera may expect one zero at the end of the command
>> int result = usb_control_msg(devHandle, 0x21, 9, 0x2, 0x0, (char*)buffer,
>> 16, 100); if (result == 16) cout << "Successfully sent all bytes to
>> camera"
>> << endl;
>>
>> A minor thing, as far as I know there is no need to claim the interface
>> since the control mesaages are not related to any interface.
>>
>> Best regards
>> Ekkehard
>>
>>
>>
>>
>> --
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>> Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.
>>
>>
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