Package 'qrencoder'

Return a QR encoded string as a matrix

Description

Useful if you want to do your own post-processing

Usage

qrencode(to_encode)

Arguments

to_encode

the data to encode

Examples

qrencode("http://rud.is/b")

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Return a QR encoded string as an x, y, z data.frame

Description

Useful for ggplot::geom_raster

Usage

qrencode_df(to_encode)

Arguments

to_encode

the data to encode

Examples

head(qrencode_df("http://rud.is/b"))

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Return a QR encoded string as a base 64 encoded inline png

Description

Return a QR encoded string as a base 64 encoded inline png

Usage

qrencode_png(to_encode)

Arguments

to_encode

the data to encode

Note

data:image/png;base64, is prepended to the encoded png

Examples

cat(qrencode_png("http://rud.is/b"))

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Return a QR encoded string as a raster object

Description

Return a QR encoded string as a raster object

Usage

qrencode_raster(to_encode)

Arguments

to_encode

the data to encode

Examples

library(raster)
old_mar <- par()$mar
par(mar=c(0,0,0,0))
image(qrencode_raster("http://rud.is/b"), asp=1, col=c("white", "black"),
                                          axes=FALSE, xlab="", ylab="")
par(mar=old_mar)

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Encodes a string as a QR code

Description

Encodes a string as a QR coder

Usage

qrencode_raw(to_encode, version = 0L, level = 0L, hint = 2L,
  caseinsensitive = 1L)

Arguments

to_encode	character string to encode
version	version of the symbol. If 0, the library chooses the minimum version for the given input data.
level	error correction level (0 - 3, lowest to highest)
hint	tell the library how Japanese Kanji characters should be encoded: If "3", the library assumes that the given string contains Shift-JIS characters and encodes them in Kanji-mode. If "2" is given, all of non-alphanumerical characters will be encoded as is. If you want to embed UTF-8 string, choose this. Trying to encode UTF-8 with modes will cause an error. "0" is "numeric mode", "1" is "alphanumeric mode" "5" is "ECI mode".
caseinsensitive	case-sensitive(1) or not(0).

See Also

http://www.qrcode.com/en/about/version.html

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Return a QR encoded string as an svg string

Description

Encodes a string as a QR coder

Usage

qrencode_svg(to_encode, version = 0L, level = 0L, hint = 2L,
  caseinsensitive = 1L, margin = 0L, size = 3L, dpi = 72L)

Arguments

to_encode	character string to encode
version	version of the symbol. If 0, the library chooses the minimum version for the given input data.
level	error correction level (0 - 3, lowest to highest)
hint	tell the library how Japanese Kanji characters should be encoded: If "3", the library assumes that the given string contains Shift-JIS characters and encodes them in Kanji-mode. If "2" is given, all of non-alphanumerical characters will be encoded as is. If you want to embed UTF-8 string, choose this. Trying to encode UTF-8 with modes will cause an error. "0" is "numeric mode", "'1" is "alphanumeric mode" "5" is "ECI mode".
caseinsensitive	case-sensitive(1) or not(0).
margin	width of the marginsl default is 4
size	module size in dots (pixels); default is 3
dpi	resolution; default = 72

See Also

http://www.qrcode.com/en/about/version.html

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Quick Response Code (QR Code) / Matrix Barcode Creator

Description

Quick Response codes (QR codes) are a type of matrix bar code and can be used to authenticate transactions, provide access to multi-factor authentication services and enable general data transfer in an image. QR codes use four standardized encoding modes (numeric, alphanumeric, byte/binary, and kanji) to efficiently store data. Matrix barcode generation is performed efficiently in C via the included 'libqrencoder' library created by Kentaro Fukuchi.

Author(s)

Bob Rudis ([email protected])

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