Delphi DLL 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 DLL

var
success: Boolean;
fmt: HCkFormats;
json: HCkJsonObject;
jsonOut: HCkJsonObject;

begin
success := False;

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

fmt := CkFormats_Create();
json := CkJsonObject_Create();
jsonOut := CkJsonObject_Create();

//  Digits only.
CkJsonObject_UpdateString(json,'payload.text','00123456789012345678');
success := CkFormats_QrCode(fmt,'generate',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add(CkFormats__lastErrorText(fmt));
    Exit;
  end;
Memo1.Lines.Add('digits: mode ' + CkJsonObject__stringOf(jsonOut,'symbols[0].selectedEncoding.mode') + ', version ' + IntToStr(CkJsonObject_IntOf(jsonOut,'symbols[0].selectedEncoding.version')));

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

//  Lower-case letters are not, so the same text in lower case needs byte mode.
CkJsonObject_UpdateString(json,'payload.text','order-12345 lot a7 shelf 12-c');
success := CkFormats_QrCode(fmt,'generate',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add(CkFormats__lastErrorText(fmt));
    Exit;
  end;
Memo1.Lines.Add('lower case: mode ' + CkJsonObject__stringOf(jsonOut,'symbols[0].selectedEncoding.mode') + ', version ' + IntToStr(CkJsonObject_IntOf(jsonOut,'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.
CkJsonObject_UpdateString(json,'payload.text','00123456789012345678');
CkJsonObject_UpdateString(json,'encoding.qr.mode','byte');
success := CkFormats_QrCode(fmt,'generate',json,jsonOut);
if (success = False) then
  begin
    Memo1.Lines.Add(CkFormats__lastErrorText(fmt));
    Exit;
  end;
Memo1.Lines.Add('digits as bytes: mode ' + CkJsonObject__stringOf(jsonOut,'symbols[0].selectedEncoding.mode') + ', version ' + IntToStr(CkJsonObject_IntOf(jsonOut,'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

CkFormats_Dispose(fmt);
CkJsonObject_Dispose(json);
CkJsonObject_Dispose(jsonOut);