RxUsbOpen: Difference between revisions
Created page with "==Description== Acquires access to a specific USB device. ==Syntax== Acquires access to a specific USB device. <pre> rc = RxUsbOpen(Handle,EnumDevice,idVendor,idProduct) <..." |
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Revision as of 04:23, 6 January 2017
Description
Acquires access to a specific USB device.
Syntax
Acquires access to a specific USB device.
rc = RxUsbOpen(Handle,EnumDevice,idVendor,idProduct)
Acquires access to a more specific USB device.
rc = RxUsbOpen(Handle,EnumDevice,idVendor,idProduct,bcdDevice)
Parameters
- Handle
- receives Device Handle to be used to access this USB device.
- EnumDevice
- use 0 to accept any specified device or N for the Nth device.
- idVendor
- the Vendor Identifier (VendorID) from the device descriptor.
- idProduct
- the Product Identifier (ProductID) from the device descriptor.
- bcdDevice
- the Device Release Number from the device descriptor.
Return Code
Errors
Remarks
Example Code
/* add RxUsbOpen */
rc = RxFuncAdd('RxUsbOpen','usbcalls','RxUsbOpen')
say '+RxUsbOpen(),RC=0x'd2x(rc)
/* invoke RxUsbOpen */
drop Handle /* receives device handle */
EnumDevice=0 /* accept any free device */
idVendor=x2d(046D) /* vendor identifier */
idProduct=x2d(0804) /* product identifier */
bcdDevice=x2d(0009) /* device release number */
rc = RxUsbOpen(Handle,EnumDevice,idVendor,idProduct,bcdDevice)
say '*RxUsbOpen(),RC=0x'd2x(rc)
/* drop RxUsbOpen */
rc = RxFuncDrop('RxUsbOpen')
say '-RxUsbOpen(),RC=0x'd2x(rc)