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@eielh

printを使って標準エラー出力へ出力

More than 5 years have passed since last update.
  • swift 2.2
  • Xcode 7.3
class StandardErrorOutputStream: OutputStreamType {
    func write(string: String) {
        let stderr = NSFileHandle.fileHandleWithStandardError()
        if let odata = string.dataUsingEncoding(NSUTF8StringEncoding) {
            stderr.writeData(odata)
        }
    }
}

var standardError = StandardErrorOutputStream()
print("stderr", toStream: &standardError)

NSDataへの変更で失敗することがあるのかよく知らないけど、失敗するとつらそう。
遊びで気軽に出力するならlibcのfputs使うほうが楽そう。

fputs("stderr", stderr)

場合によってはimport Darwinが必要になるかもしれないが、どんなときに必要かは調べていない。

参考文献

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