RxUsbQueryDeviceReport
Obtains the Compound Descriptor of a specific USB device.
Syntax
For access by Device Handle use:
rc = RxUsbQueryDeviceReport(Handle,Report)
For access by Device Number use:
rc = RxUsbQueryDeviceReport(Number,Report)
Parameters
- Handle
- the Device Handle received from the previous RxUsbOpen.
- Number
- the Device Number from 1 up to the Total Number from RxUsbQueryNumberDevices.
- Report
- receives the Compound Descriptor as hexadecimal string.
Return Code
0x0000 - NO_ERROR
Errors
0x0057 - ERROR_INVALID_PARAMETER 0x1B58 - USB_NOT_INIT 0xFF13 - ERROR_I24_INVALID_PARAMETER 0xFF1F - ERROR_GEN_FAILURE 0xFF37 - ERROR_DEV_NOT_EXIST 0xFF57 - ERROR_INVALID_PARAMETER 0xFF6F - ERROR_BUFFER_OVERFLOW 0xFFEA - ERROR_MORE_DATA
Remarks
The Compound Descriptor is the concatenation of Device Descriptor and Configuration Descriptor.
Example Code
/* add RxUsbQueryDeviceReport */
rc = RxFuncAdd('RxUsbQueryDeviceReport','usbcalls','RxUsbQueryDeviceReport')
say '+RxUsbQueryDeviceReport(),RC=0x'd2x(rc)
/* invoke RxUsbQueryDeviceReport */
drop Report /* receives device report */
rc = RxUsbQueryDeviceReport(Handle,Report)
say '*RxUsbQueryDeviceReport(),RC=0x'd2x(rc)
/* drop RxUsbQueryDeviceReport */
rc = RxFuncDrop('RxUsbQueryDeviceReport')
say '-RxUsbQueryDeviceReport(),RC=0x'd2x(rc)