Is it Possible to create vCard with This GEM? about rqrcode

[gazeldx]

I met the same problem today. I fixed it by
replace IO.write("your_image_name.png", png.to_s) to
png.save("your_image_name.png", :interlace => true)

[nickgnd]

For me :interlace => true didn't work.

I solved using File.open("path/to/your_image_name.png", 'wb') { |f| f.write(png.to_s) }

The exception is raised by chunky_png gem, see this issue and this comment

hope it helps!

[chrise86]

Using that exact example I get:

Encoding::UndefinedConversionError: "\x89" from ASCII-8BIT to UTF-8

Using html works, however, when scanned it only shows the last event.

[kstratis]

A bit late to the party but bumped to the same problem earlier today.
Managed to put together the pieces and here's the full solution that worked for me:

# Use the `VCardigan` gem to generate the vcard
# Ref: https://github.com/brewster/vcardigan/
@vcard = ::VCardigan.create(:version => '4.0')
@vcard.fullname 'John Smith'
@vcard.tel '[phone]', :type => 'work'
@vcard.email '[email protected]', :type => 'work'

# Wrap it properly within `RQRCode::QRCode` (Thanks @bjornblomqvist!)
qr = RQRCode::QRCode.new(@vcard.to_s, :level => :l)

# Generate the image (Thanks @nickgnd!)
File.open("/tmp/test.png", 'wb') { |f| f.write(qr.as_png(:size => 600)) }

Hope this gives the full picture and helps someone else in the future!
Peace 🖖

[bjornblomqvist]

You can put whatever you want in the qrcode. I have never created any vCard qrcode myself so i cant tell you how to do it. But if you google and experiment you will probably figure it out.

/Björn

[kannathasan-san]

Thanks for the update.. I tried google and didn't the exact solution.
Can you please give me some example to do it.

My current code will like

 def generate_qr_code(field_names, url)
    field_string = template.host_url_id.present? ? "Id: #{id} \n" : ""
    field_names.each_with_index{|(k, v), index|
      break if index == 3
      field_string += template.host_url_id.present? ? "#{k}: #{v}\n" : "#{v}\n"
    }
    field_string = truncate(field_string, :length => 250, omission: "...\n")
    field_string += "For more detail click #{url}?product_token=#{auth_token} \n" if template.host_url_id.present?
    qr = RQRCode::QRCode.new(field_string)
    target="#{Rails.root}/public/system/tmp/#{id}.svg"
    File.open(target, "w+") do |f|
      f.write(qr.as_svg(offset: 0, color: 'green', shape_rendering: 'crispEdges', module_size: 5))
    end
    update_attributes(:qr => File.open(target))
    system("rm #{target}")
  end
end

[kannathasan-san]

Please advise how to generate Vcard in the above codebase.(when we scan the QR code it should automatically ask like "add to contacts"...)

[bjornblomqvist]

Av far as i can see the only thing you need to do is to use the vcard text as the content of the qrcode. How to create a vcard you will have to figure out youself.

Maybe these pages can help you.

http://snapmyinfo.com/blog/how-to-create-a-business-card-qr-code/
https://lrvick.net/blog/accessibly_importing_vcards_from_qr_codes/

[chrise86]

I'm having difficulty when trying to generate a vCalendar event too:

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//bobbin v0.1//NONSGML iCal Writer//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTART:20100701T080000Z
DTEND:20100701T110000Z
DTSTAMP:20091130T213238Z
UID:[email protected]
CREATED:20091130T213238Z
DESCRIPTION:Example event 1
LAST-MODIFIED:20091130T213238Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:Example event 1
TRANSP:OPAQUE
END:VEVENT
BEGIN:VEVENT
DTSTART:20100701T120000Z
DTEND:20100701T130000Z
DTSTAMP:20091130T213238Z
UID:[email protected]
CREATED:20091130T213238Z
DESCRIPTION:Example event 2
LAST-MODIFIED:20091130T213238Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:Example event 2
TRANSP:OPAQUE
END:VEVENT
END:VCALENDAR

I get varying code length overflow issues - can this be done?

[bjornblomqvist]

Could you post the actual exception message and stacktrace?

[bjornblomqvist]

This works for me.

require 'rqrcode'

t = "BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//bobbin v0.1//NONSGML iCal Writer//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTART:20100701T080000Z
DTEND:20100701T110000Z
DTSTAMP:20091130T213238Z
UID:[email protected]
CREATED:20091130T213238Z
DESCRIPTION:Example event 1
LAST-MODIFIED:20091130T213238Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:Example event 1
TRANSP:OPAQUE
END:VEVENT
BEGIN:VEVENT
DTSTART:20100701T120000Z
DTEND:20100701T130000Z
DTSTAMP:20091130T213238Z
UID:[email protected]
CREATED:20091130T213238Z
DESCRIPTION:Example event 2
LAST-MODIFIED:20091130T213238Z
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:Example event 2
TRANSP:OPAQUE
END:VEVENT
END:VCALENDAR"

qrcode = RQRCode::QRCode.new(t, :level => :l)
IO.write("/tmp/vcard-qrcode.png", qrcode.as_png(:size => 600))

[bjornblomqvist]

Do you have stacktrace?

[samvandamme]

@bjornblomqvist I have a stack trace of the same problem:

2.3.3 :028 > IO.write("/tmp/github-qrcode.png", png.to_s)
Encoding::UndefinedConversionError: "\x89" from ASCII-8BIT to UTF-8
	from (irb):28:in `write'
	from (irb):28
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/railties-5.0.1/lib/rails/commands/console.rb:65:in `start'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/railties-5.0.1/lib/rails/commands/console_helper.rb:9:in `start'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:78:in `console'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/railties-5.0.1/lib/rails/commands.rb:18:in `<top (required)>'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/skylight-1.0.1/lib/skylight/probes.rb:81:in `require'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/skylight-1.0.1/lib/skylight/probes.rb:81:in `require'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `block in require'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
	from /Users/sam/Dropbox/Private/Development/Trixx/projects/trixx/code/website_app/trixx/bin/rails:9:in `<top (required)>'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `load'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `block in load'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `load'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/spring-2.0.0/lib/spring/commands/rails.rb:6:in `call'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/spring-2.0.0/lib/spring/command_wrapper.rb:38:in `call'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/spring-2.0.0/lib/spring/application.rb:191:in `block in serve'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/spring-2.0.0/lib/spring/application.rb:161:in `fork'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/spring-2.0.0/lib/spring/application.rb:161:in `serve'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/spring-2.0.0/lib/spring/application.rb:131:in `block in run'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/spring-2.0.0/lib/spring/application.rb:125:in `loop'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/spring-2.0.0/lib/spring/application.rb:125:in `run'
	from /Users/sam/.rvm/gems/ruby-2.3.3/gems/spring-2.0.0/lib/spring/application/boot.rb:19:in `<top (required)>'
	from /Users/sam/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /Users/sam/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from -e:1:in `<main>'