Delphi ActiveX Requires Chilkat v11.7.0+

QR Code Numeric, Alphanumeric and Byte Modes

See more QR Code Examples

Demonstrates the QR encoding modes. Digits alone are stored in numeric mode, and text made only of digits, upper-case letters, space and $ % * + - . / : in alphanumeric mode. Both pack more characters into a symbol than byte mode, which is used for everything else. QrCode chooses the most compact mode the text allows, and the response reports it. A product code written in upper case therefore gives a smaller symbol than the same code in lower case. Delphi ActiveX

var
success: Integer;
fmt: TChilkatFormats;
json: TChilkatJsonObject;
jsonOut: TChilkatJsonObject;

begin
success := 0;

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

fmt := TChilkatFormats.Create(Self);
json := TChilkatJsonObject.Create(Self);
jsonOut := TChilkatJsonObject.Create(Self);

//  Digits only.
json.UpdateString('payload.text','00123456789012345678');
success := fmt.QrCode('generate',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(fmt.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('digits: mode ' + jsonOut.StringOf('symbols[0].selectedEncoding.mode') + ', version ' + IntToStr(jsonOut.IntOf('symbols[0].selectedEncoding.version')));

//  Upper-case letters, digits, space and - are all in the alphanumeric set.
json.UpdateString('payload.text','ORDER-12345 LOT A7 SHELF 12-C');
success := fmt.QrCode('generate',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(fmt.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('upper case: mode ' + jsonOut.StringOf('symbols[0].selectedEncoding.mode') + ', version ' + IntToStr(jsonOut.IntOf('symbols[0].selectedEncoding.version')));

//  Lower-case letters are not, so the same text in lower case needs byte mode.
json.UpdateString('payload.text','order-12345 lot a7 shelf 12-c');
success := fmt.QrCode('generate',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(fmt.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('lower case: mode ' + jsonOut.StringOf('symbols[0].selectedEncoding.mode') + ', version ' + IntToStr(jsonOut.IntOf('symbols[0].selectedEncoding.version')));

//  The mode can be named.  Byte mode can hold any text.  Naming a mode the text cannot use
//  (numeric for text with letters, for example) fails with conflictingOptions.
json.UpdateString('payload.text','00123456789012345678');
json.UpdateString('encoding.qr.mode','byte');
success := fmt.QrCode('generate',json.ControlInterface,jsonOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(fmt.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('digits as bytes: mode ' + jsonOut.StringOf('symbols[0].selectedEncoding.mode') + ', version ' + IntToStr(jsonOut.IntOf('symbols[0].selectedEncoding.version')));

//  The four symbols, in the order they were made:

//  

//  Sample output:

//  digits: mode numeric, version 1
//  upper case: mode alphanumeric, version 2
//  lower case: mode byte, version 3
//  digits as bytes: mode byte, version 2