RetrieveData

Description

Retrieves data from scanner firmware and places it in instance properties of the scanner object.

Applies to

BarcodeScanner objects

Syntax

Integer scanner.RetrieveData ( )

Argument	Description
scanner	The scanner object linked to the scanner from which you want to retrieve data

Returns

Integer. Returns 1 for success or one of the following negative values if an error occurs:

-1 Unspecified error
-2 Supporting DLL not loaded error
-3 Initialization error other than DLL not loaded
-4 Error in the passed in arguments
-5 Something in the object instance is inconsistent
-6 Call to the driver failed
-7 Error opening the specific scan device
-8 Error in the internal buffer allocation
-9 Incorrect scan state for the requested action (typically benign)
-10 Low level device error
-11 Read is already pending (typically benign)
-12 Read is cancelled (typically benign)
-13 Timeout period expired on the read (typically benign)
-14 Error creating the asynchronous read from the message sink
-100 Feature not implemented

Usage

After you call RetrieveData, the data from the most recent scan are saved in the BarcodeScanner object’s ScannedSymbology and ScannedData properties (data members). You can retrieve the data by assigning these properties to string variables or by displaying them in a text control.

Examples

Example 1

The following example retrieves data from a single scan:

Integer l_iret

l_iret = l_scanner.Open()

l_iret = l_scanner.ScanWait( 30 )

l_iret = l_scanner.RetrieveData()

sle_symbology.text=string(l_scanner.ScannedSymbology)

sle_data.text = l_scanner.ScannedData