Haskell 将wreq响应打印到终端
我想做一些非常简单的事情;做出Haskell 将wreq响应打印到终端,haskell,haskell-stack,Haskell,Haskell Stack,我想做一些非常简单的事情;做出wreq响应并将内容打印到终端 main.hs如下所示: {-#语言重载字符串} 我的.cabal文件如下所示: executable wreqscraper hs-source-dirs: src main-is: Main.hs default-language: Haskell2010 build-depends: base >= 4.7 && < 5,
wreq
响应并将内容打印到终端
main.hs如下所示:
{-#语言重载字符串}
我的.cabal文件如下所示:
executable wreqscraper
hs-source-dirs: src
main-is: Main.hs
default-language: Haskell2010
build-depends: base >= 4.7 && < 5,
wreq,
bytestring
用
putStrLn
(或类似的东西)打印这些内容的正确方法是什么?您需要通过testring打开响应,这样您就得到了一个ByteString
,您可以将其与C.unpack
一起使用
以下是一个工作示例:
{-# LANGUAGE OverloadedStrings #-}
import Network.Wreq
import Control.Lens
import Data.ByteString.Lazy.Char8 as C
main :: IO ()
main = do
r <- get "http://httpbin.org/get"
Prelude.putStrLn $ C.unpack $ (r ^. responseBody)
{-#语言重载字符串}
导入网络.Wreq
进口管制.镜头
将Data.ByteString.Lazy.Char8作为C导入
main::IO()
main=do
r您需要通过testring
打开响应,这样您就可以通过testring
获得一个响应,并且可以将它与C.unpack
一起使用
以下是一个工作示例:
{-# LANGUAGE OverloadedStrings #-}
import Network.Wreq
import Control.Lens
import Data.ByteString.Lazy.Char8 as C
main :: IO ()
main = do
r <- get "http://httpbin.org/get"
Prelude.putStrLn $ C.unpack $ (r ^. responseBody)
{-#语言重载字符串}
导入网络.Wreq
进口管制.镜头
将Data.ByteString.Lazy.Char8作为C导入
main::IO()
main=do
R
/Users/mkaravan/end2end/haskell_sandbox/wreqscraper/src/Main.hs:22:22: error:
• Couldn't match expected type ‘C.ByteString’
with actual type ‘Response
Data.ByteString.Lazy.Internal.ByteString’
• In the first argument of ‘C.unpack’, namely ‘r’
In the first argument of ‘putStrLn’, namely ‘(C.unpack r)’
In a stmt of a 'do' block: putStrLn (C.unpack r)
{-# LANGUAGE OverloadedStrings #-}
import Network.Wreq
import Control.Lens
import Data.ByteString.Lazy.Char8 as C
main :: IO ()
main = do
r <- get "http://httpbin.org/get"
Prelude.putStrLn $ C.unpack $ (r ^. responseBody)