Class
Barcode
Description
Uses the device's camera to read any bar code types supported by the device.
Methods
Name |
Parameters |
Returns |
Shared |
|---|---|---|---|
image As Picture |
✓ |
||
value As String, Size As Double, type As Barcode.Types = Barcode.Types.QR |
✓ |
||
Events
Name |
Parameters |
Returns |
|---|---|---|
value As String |
||
Enumerations
Barcode.Types
Types
The types of barcodes that can be read.
Name |
|---|
QR |
Bar128 |
Method descriptions
Barcode.FromImage
FromImage(image As Picture) As String()
Returns an array of the unique identifiers from all detected barcodes in the image provided.
This method is shared.
Important
This method is not currently supported for Android.
Barcode.Image
Image(value As String, Size As Double, type As Barcode.Types = Barcode.Types.QR) As Picture
Returns an image with the value encoded as the specified type of barcode.
This method is shared.
Important
This method is not currently supported for Android.
Barcode.StartScan
StartScan
Opens the scanning user interface provided by the device to scan a barcode. The device will auto-detect the type of barcode.
Important
For macOS, this method requires macOS 10.15 or later.
Barcode.StopScan
StopScan
Stops the process of scanning barcodes and closes the scanning user interface on the device.
Important
This method is not currently supported for Android.
Event descriptions
Barcode.ScanCancelled
ScanCancelled
The user canceled the scan.
Barcode.ScanCompleted
ScanCompleted(value As String)
A barcode was successfully scanned. The value is the unique identifier scanned.
Barcode.ScanFailed
ScanFailed
The scan was not able to complete.
Notes
For Android Play Store installs, the Play Store will download and install the barcode library if it was not already installed on the device. For non Play Store-installs, the OS will download the library after it is first used (if it is not already installed). Attempting to scan before the library is installed (which could take several minutes depending on how the OS prioritizes it) will result in the ScanFailed event will be called until it completes.
On Linux, X11 is required. This class is not supported for Wayland.
Supported barcode types
The following types of barcodes are supported:
Type |
Description |
|---|---|
UPC-E |
Only has 8 digits and is used instead of UPC-A on smaller products. It is similarly used in retail and warehousing, especially in the USA and Canada. |
Code39 |
Widely used in a variety of industries and is part of of many governmental specifications. It encodes a set of alphanumeric symbols. |
EAN13 |
Codes are widely used in retail across Europe. There are several versions of EAN encoding 2, 5, 7 or 12 digits. |
EAN8 |
Derived from the longer European Article Number (EAN-13) code. It was introduced for use on small packages where an EAN-13 barcode would be too large. |
Code93 |
Encodes numerical input, as well as capital letters and some special characters. It used by Canada Post for additional delivery information. |
Code128 |
Universal barcode with excellent data density. It is used, for example, in shipping and packaging. |
PDF417 |
Suitable for storing large amounts of data due to its two-dimensional structure. It is widely used for labeling electronic equipment or hazardous materials, but also on personal IDs. |
QR |
Applications include product tracking, item identification, time tracking, document management, and general marketing. |
Aztec |
Two-dimensional Barcodes and has a characteristic square pattern in the middle. This Code is widely used by railway companies in their ticketing systems. |
Interleaved2of5 |
Developed on the basis of Industrial Code 2 of 5 and only encodes an even number of digits. It is used in warehousing and industrial applications. |
ITF14 |
Also called SCC-14 is used to mark shipping containers. It is also placed on cartons and pallets and signifies the type of products transported. |
Data Matrix |
Two-dimensional Code that may contain text, numbers or binary data. It is widely used for labeling small electronic components or in food production, but also on mail labels. |
Compatibility
Desktop, iOS and Android projects types on all supported operating systems.
See also
Object parent class