Delphi ActiveX

QR Code Generator via api.qrserver.com REST API

See more HTTP Examples

Demonstrates how to generate a QR code using the api.qrserver.com REST API service. Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
http: TChilkatHttp;
queryParams: TChilkatJsonObject;
resp: TChilkatHttpResponse;
bd: TChilkatBinData;

begin
success := 0;

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

http := TChilkatHttp.Create(Self);

// Send the following GET request to get a binary response.
// The body of the binary response contains the image data for the QR code.
// https://api.qrserver.com/v1/create-qr-code/?data=[URL-encoded-text]&size=[pixels]x[pixels]

queryParams := TChilkatJsonObject.Create(Self);
queryParams.UpdateString('data','Hello World');
queryParams.UpdateString('size','100x100');

// Get a PNG file..
// Possible formats are:
// png
// gif
// jpeg
// jpg
// svg
// eps
// Case matters.  Use lowercase.
queryParams.UpdateString('format','png');

// Send the GET request to an endpoint.
// Chilkat will add the url-encoded query params passed in the JSON.
resp := TChilkatHttpResponse.Create(Self);
success := http.HttpParams('GET','https://api.qrserver.com/v1/create-qr-code/',queryParams.ControlInterface,resp.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

// Did it succeed?
if (resp.StatusCode <> 200) then
  begin
    // The response body, if anything, would not be the image data, but would likely be the error text (or HTML, or whatever...)
    Memo1.Lines.Add(resp.BodyStr);
    Memo1.Lines.Add('Response status = ' + IntToStr(resp.StatusCode));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

// Success if we get here..
// Save the binary body as the PNG file, or you can get the bytes of the PNG..
success := resp.SaveBodyBinary('c:/temp/qa_output/qr_code.png');

// Or get the bytes:
bd := TChilkatBinData.Create(Self);
resp.GetBodyBd(bd.ControlInterface);
// Use the bytes in bd...
// See the online reference documentation for the function to access the bytes directly.

Memo1.Lines.Add('Success.');
end;