Re: Using getReport with a HID device...

On Apr 13, 2005, at 8:39 PM, Rob Yepez wrote:

Hi Charles,

The reportID in getReport refers to the report ID associated with the particular feature report you are trying obtain.  This corresponds in the first byte of the report if there are more than one reports associated with the device.  Since your example is modifying the first byte, it's safe to say that there are not multiple reports defined by the device.  In this case, just use 0 for the reportID.

The reportID information should be detailed in the report descriptor for the device.  To view the descriptor on X, use the USB Prober application located in /Developer/Applications/Utilities/.

- Rob

OK, I did the following

    HIDPreparsedDataRef        dataRef;

    long                    rSize = kBufferSize;

    char                    buffer[kBufferSize];

    IOReturn                ioReturnValue = kIOReturnSuccess;

//  First, open the device...

    ioReturnValue = (*hidDeviceInterface)->open( hidDeviceInterface , 0 );

//

    ioReturnValue = HIDOpenReportDescriptor ( hidDeviceInterface            ,

                                              sizeof( hidDeviceInterface )  ,

                                              &dataRef                        ,

                                              kHIDFlag_StrictErrorChecking  );

    ioReturnValue = getReport (hidDeviceInterface, kIOHIDReportTypeInput, 0, buffer, &rSize, -1, nil, nil, nil);

When the system tries to execute getReport the program dies stating that it "...has executed due to signal 10 (SIGBUS)."  kBufferSize is 16384. I don't have a clue what "signal 10" is nor am I sure what I did wrong. Can anybody please give me some clues? _______________________________________________

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