避免在R的網址編碼

Question

我試圖從谷歌地理編碼API獲取經緯度，但當丹麥本地字符在地址中時請求失敗。我懷疑這是因爲httr :: GET函數會對url進行編碼，但我不確定我是否正確。

如果複製/直接粘貼此鏈接到瀏覽器中，你得到一個有效的結果： http://maps.googleapis.com/maps/api/geocode/json?address =Søholmen+ 9，+ 4500 +丹麥

但下面的代碼是無效的，即使網址是同前它被解析成GET函數。如果我使用沒有本地字符的地址，它會起作用。

library(httr) 
library(jsonlite) 
library(stringr) 

address <- "Søholmen 9, 4500 Denmark" 
# address <- "Kronprinsesse Sofies Vej 6, 2000 Denmark" 

base_url <- "http://maps.googleapis.com/maps/api/geocode/json?" 

# An address OR components 
geo_url <- paste0(base_url, "address=", str_replace_all(address, pattern = " ", replacement = "+")) 

# Get the result 
# get the content 
# Parse the JSON 
temp_geo_results <- httr::GET(url = URLencode(URL = geo_url), verbose()) 
temp_geo_results <- httr::content(temp_geo_results, as = "text") 
temp_geo_results <- jsonlite::fromJSON(temp_geo_results) 

這裏是我的sessionInfo（）

R version 3.1.2 (2014-10-31) 
Platform: x86_64-w64-mingw32/x64 (64-bit) 

locale: 
[1] LC_COLLATE=Danish_Denmark.1252 LC_CTYPE=Danish_Denmark.1252  LC_MONETARY=Danish_Denmark.1252 
[4] LC_NUMERIC=C     LC_TIME=Danish_Denmark.1252  

attached base packages: 
[1] stats  graphics grDevices utils  datasets methods base  

other attached packages: 
[1] stringr_0.6.2 jsonlite_0.9.10 httr_0.5  

loaded via a namespace (and not attached): 
[1] RCurl_1.95-4.3 tools_3.1.2 

編輯：我刪除一行代碼沒有必要的問題，並增加我的sessionInfo。

Answer 1

這似乎是一個編碼問題。

對我來說，以下罰款作品：

address <- "Søholmen 9, 4500 Denmark" 
u <- sprintf("http://maps.googleapis.com/maps/api/geocode/json?address=%s", 
      gsub('\\s+', '+', enc2utf8(address))) 

fromJSON(content(GET(u), as='text')) 

Answer 2

我可以分享原油路我如何在我的語言解決的非常相同的問題：

deencode <- function(text){ 
    output <- NULL 
    for(i in 1:length(text)){ 
    temp <- text[i] 
    temp <- gsub("ā", "a", temp) 
    temp <- gsub("Ā", "A", temp) 
    temp <- gsub("č", "c", temp) 
    temp <- gsub("Č", "C", temp) 
    temp <- gsub("ē", "e", temp) 
    temp <- gsub("Ē", "E", temp) 
    temp <- gsub("ģ", "g", temp) 
    temp <- gsub("Ģ", "G", temp) 
    temp <- gsub("ī", "i", temp) 
    temp <- gsub("Ī", "I", temp) 
    temp <- gsub("ķ", "k", temp) 
    temp <- gsub("Ķ", "K", temp) 
    temp <- gsub("ļ", "l", temp) 
    temp <- gsub("Ļ", "L", temp) 
    temp <- gsub("ņ", "n", temp) 
    temp <- gsub("Ņ", "N", temp) 
    temp <- gsub("š", "s", temp) 
    temp <- gsub("Š", "S", temp) 
    temp <- gsub("ū", "u", temp) 
    temp <- gsub("Ū", "u", temp) 
    temp <- gsub("ž", "z", temp) 
    temp <- gsub("Ž", "Z", temp) 
    output <- c(output, temp) 
    } 
    return(output) 
} 

這個簡單的替代它的所有工作，至少在谷歌的地理編碼API之後。

Answer 3

可以使用rvest包

library(rvest); library(jsonlite) 
address <- "Søholmen 9, 4500 Denmark" 
# address <- "Kronprinsesse Sofies Vej 6, 2000 Denmark" 
base_url <- "http://maps.googleapis.com/maps/api/geocode/json?" 

# An address OR components 
geo_url <- paste0(base_url, "address=", str_replace_all(address, pattern = " ", replacement = "+")) 
geo_url <- iconv(geo_url, to="UTF-8") 

temp_geo_results <- html_text(html_nodes(html(geo_url) , "p")) 
temp_geo_results <- fromJSON(temp_geo_results)