B4X Requires Chilkat v11.7.0+

QR Codes for Email, Phone, SMS and Location

See more QR Code Examples

Demonstrates QR codes that start an action on a phone. A QR code only holds text, and what happens on scanning depends on the form of that text: mailto: starts an email, tel: dials a number, SMSTO: starts a text message, and geo: opens a map at a latitude and longitude. A web address opens in the browser. B4X

Dim success As Boolean = False

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim fmt As ChilkatFormats
fmt.Initialize
Dim json As ChilkatJsonObject
json.Initialize
Dim jsonOut As ChilkatJsonObject
jsonOut.Initialize
json.UpdateInt("render.moduleSize", 6)
json.UpdateBool("output.overwrite", True)
json.UpdateString("output.return", "none")

'  An email, with the address and optionally a subject.  Spaces in the subject are written %20.
json.UpdateString("payload.text", "mailto:support@example.com?subject=Order%2012345")
json.UpdateString("output.path", "qa_output/qr_email.png")
success = fmt.QrCode("generate", json, jsonOut)
If success = False Then
    Log(fmt.LastErrorText)
    Return
End If

Log("email: version " & jsonOut.IntOf("symbols[0].selectedEncoding.version") & ", " & jsonOut.StringOf("outputs[0].path"))

'  

'  A phone number to dial, in international form.
json.UpdateString("payload.text", "tel:+15555550100")
json.UpdateString("output.path", "qa_output/qr_phone.png")
success = fmt.QrCode("generate", json, jsonOut)
If success = False Then
    Log(fmt.LastErrorText)
    Return
End If

Log("phone: version " & jsonOut.IntOf("symbols[0].selectedEncoding.version") & ", " & jsonOut.StringOf("outputs[0].path"))

'  

'  A text message: the number, then the message.
json.UpdateString("payload.text", "SMSTO:+15555550100:Please call me back")
json.UpdateString("output.path", "qa_output/qr_sms.png")
success = fmt.QrCode("generate", json, jsonOut)
If success = False Then
    Log(fmt.LastErrorText)
    Return
End If

Log("sms: version " & jsonOut.IntOf("symbols[0].selectedEncoding.version") & ", " & jsonOut.StringOf("outputs[0].path"))

'  

'  A location: latitude, then longitude, in degrees.
json.UpdateString("payload.text", "geo:41.8781,-87.6298")
json.UpdateString("output.path", "qa_output/qr_location.png")
success = fmt.QrCode("generate", json, jsonOut)
If success = False Then
    Log(fmt.LastErrorText)
    Return
End If

Log("location: version " & jsonOut.IntOf("symbols[0].selectedEncoding.version") & ", " & jsonOut.StringOf("outputs[0].path"))

'  

'  Sample output:

'  email: version 4, qa_output/qr_email.png
'  phone: version 2, qa_output/qr_phone.png
'  sms: version 3, qa_output/qr_sms.png
'  location: version 2, qa_output/qr_location.png