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2015/5/12
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20150512.md

mruby

取得したmrb_valueがnilかを判定すには

mrb_value v;
if (mrb_nil_p(v)) {
  // nilの場合の処理
}

ImageMagick

Image#to_blobメソッドではURL指定が扱えないのかも

terminate called after throwing an instance of 'Magick::ErrorMissingDelegate'
  what():  Magick: no decode delegate for this image format `//www.google.co.jp/images/nav_logo195.png' @ error/blob.c/ImageToBlob/1520

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