RxUsbQueryNumberDevices: Difference between revisions
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==Related Functions== | ==Related Functions== | ||
* [[RxUsbQueryDeviceReport]] | |||
* [[RxUsbQueryDeviceInfo]] | |||
* [[RxUsbOpen]] | |||
[[Category:USBCalls]] | [[Category:USBCalls]] | ||
Latest revision as of 19:19, 12 February 2017
Description
Obtains the Total Number of currenly attached USB devices.
Syntax
rc = RxUsbQueryNumberDevices(Number)
Parameters
- Number
- receives the Total Number.
Return Code
0x0000 - NO_ERROR
Errors
0x0057 - ERROR_INVALID_PARAMETER 0x1B58 - USB_NOT_INIT 0xFF13 - ERROR_I24_INVALID_PARAMETER 0xFF1F - ERROR_GEN_FAILURE 0xFF57 - ERROR_INVALID_PARAMETER
Remarks
Example Code
/* add RxUsbQueryNumberDevices */
rc = RxFuncAdd('RxUsbQueryNumberDevices','usbcalls','RxUsbQueryNumberDevices')
say '+RxUsbQueryNumberDevices(),RC=0x'd2x(rc)
/* invoke RxUsbQueryNumberDevices */
drop Number /* receives number of devices */
rc = RxUsbQueryNumberDevices(Number)
say '*RxUsbQueryNumberDevices(),RC=0x'd2x(rc)
/* drop RxUsbQueryNumberDevices */
rc = RxFuncDrop('RxUsbQueryNumberDevices')
say '-RxUsbQueryNumberDevices(),RC=0x'd2x(rc)