C# 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. C#

bool success = false;

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

Chilkat.Formats fmt = new Chilkat.Formats();
Chilkat.JsonObject json = new Chilkat.JsonObject();
Chilkat.JsonObject jsonOut = new Chilkat.JsonObject();
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) {
    Debug.WriteLine(fmt.LastErrorText);
    return;
}

Debug.WriteLine("email: version " + Convert.ToString(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) {
    Debug.WriteLine(fmt.LastErrorText);
    return;
}

Debug.WriteLine("phone: version " + Convert.ToString(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) {
    Debug.WriteLine(fmt.LastErrorText);
    return;
}

Debug.WriteLine("sms: version " + Convert.ToString(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) {
    Debug.WriteLine(fmt.LastErrorText);
    return;
}

Debug.WriteLine("location: version " + Convert.ToString(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