AN3224 datasheet(14/49 Pages) STMICROELECTRONICS

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PR101-USB and MR101-USB reader detection

AN3224

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Doc ID 17559 Rev 2

4.1.2

FEUSB_Scan

FEUSB_Scan Visual Basic prototype

Table 3 illustrates the FEUSB_Scan Visual Basic function.

Table 3.

FEUSB_Scan

Visual Basic function

Function description

Declaration

Public Declare Function FEUSB_Scan Lib "FEUSB.DLL"

(ByVal iScanOpt As Long, oSearchOpt As

FEUSB_SCANSEARCH) As Long

Prototype

Dim SearchOpt As FEUSB_SCANSEARCH

lngScanValue = FEUSB_Scan(FEUSB_SCAN_ALL, SearchOpt)

Parameters

iScanOpt:

FEUSB_SCAN_FIRST: performs a search for the first device registered

by the PC

FEUSB_SCAN_NEXT: performs a search for the next device registered

by the PC

FESUB_SCAN_NEW : performs a search for a new connected device

FEUSB_SCAN_ALL: performs a search for all devices connected to the

USB port.

FEUSB_SCAN_SEARCh: this parameter can be added to

FEUSB_SCAN_ALL to perform a search for a specific device.

oSearchOpt: This parameter contains the parameters of all the USB

devices detected on the PC USB port.

Returned value

0: for FEUSB_SCAN_FIRST or FEUSB_SCAN_ALL if at least one USB

device have been detected

Index of the detected device if any: for FEUSB_SCAN_NEXT and

FEUSB_SCAN_NEW

Otherwise FEUSB error code

Example

IngScanValue = FEUSB_Scan (FEUSB_SCAN_ALL,

FEUSB_SCAN_SEARCh, oSearchOpt) with oSearchOpt containing the

indentifier of a specific device to be searched for.

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