Ruby Requires Chilkat v11.7.0+

Generate a QR Code PNG in Memory

See more QR Code Examples

Demonstrates getting a QR code image without writing a file. With no output options the result is a PNG returned as base64 in outputs[0].base64 of the response. The example decodes it into a BinData, which holds the bytes of the PNG to send in an HTTP response, store in a database, attach to an email, or save. Ruby

require 'chilkat'

success = false

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

json = Chilkat::CkJsonObject.new()
json.UpdateString("payload.text","https://www.chilkatsoft.com/")
json.UpdateInt("render.moduleSize",6)

fmt = Chilkat::CkFormats.new()
jsonOut = Chilkat::CkJsonObject.new()
success = fmt.QrCode("generate",json,jsonOut)
if (success == false)
    print fmt.lastErrorText() + "\n";
    exit
end

print "format: " + jsonOut.stringOf("outputs[0].format") + "\n";
print "MIME type: " + jsonOut.stringOf("outputs[0].mimeType") + "\n";
print "image: " + jsonOut.IntOf("outputs[0].width").to_s() + " x " + jsonOut.IntOf("outputs[0].height").to_s() + " pixels" + "\n";

#  outputs[0].base64 is the PNG file, base64 encoded.
bdPng = Chilkat::CkBinData.new()
success = bdPng.AppendEncoded(jsonOut.stringOf("outputs[0].base64"),"base64")
if (success == false)
    print bdPng.lastErrorText() + "\n";
    exit
end

print "PNG bytes: " + bdPng.get_NumBytes().to_s() + "\n";

#  The BinData holds the image.  Here it is simply saved.
success = bdPng.WriteFile("qa_output/qr_in_memory.png")
if (success == false)
    print bdPng.lastErrorText() + "\n";
    exit
end

#  The PNG held in bdPng:

#  

#  Sample output:

#  format: png
#  MIME type: image/png
#  image: 222 x 222 pixels
#  PNG bytes: 877