首先关闭webshot并不是在这个背景下工作webshot（＆＃34; google.com＆＃34;） 对于webshot（＆＃34; www.google.com＆＃34;）我得到：
env: node\r: No such file or directory
Error in webshot("google.com") : webshot.js returned failure value: 127
所以这不适用于传单代码
staters <<-
readOGR(dsn="cb_2015_us_county_20m",layer="cb_2015_us_county_20m")
getMap<-function()({
leaflet(staters) %>%
addPolygons( stroke = T, fillOpacity =.7, smoothFactor = 0, color = "black",
weight = .5, fill = T, fillColor = "red"
)
output$downloadMap <- downloadHandler(
filename = function() { paste(input$chooseStates, '.png', sep='') },
content = function(file) {
# temporarily switch to the temp dir, in case you do not have write
# permission to the current working directory
owd <- setwd(tempdir())
on.exit(setwd(owd))
saveWidget(getMap(), "temp.html", selfcontained = FALSE)
webshot("temp.html", file = "filename.png", cliprect = "viewport")
}
）
我在rshiny
上运行时遇到404错误答案 0 :(得分：1)
它正在发挥作用。我认为您错过了file webshot downloadHandler中的reactive参数。
我将传单地图保存在renderLeaflet中，然后您可以在downloadHandler和## install 'webshot' package
library(devtools)
# install_github("wch/webshot")
## load packages
# install_phantomjs(version = "2.1.1",
# baseURL = "https://github.com/wch/webshot/releases/download/v0.3.1/")
library(leaflet)
library(htmlwidgets)
library(webshot)
library(shiny)
ui <- fluidPage(
leafletOutput("map"),
downloadLink("downloadMap", "Download")
)
server <- function(input,output) {
mapReact <- reactive({
leaflet() %>%
addTiles('http://{s}.tile.openstreetmap.de/tiles/osmde/{z}/{x}/{y}.png') %>%
addCircles(12.5,42,radius=500) %>% addMarkers(12,42,popup="Rome")
})
output$map <- renderLeaflet({
mapReact()
})
output$downloadMap <- downloadHandler(
filename = paste("LeafletMap", '.png', sep=''),
content = function(file) {
owd <- setwd(tempdir())
on.exit(setwd(owd))
saveWidget(mapReact(), "temp.html", selfcontained = FALSE)
webshot("temp.html", file = file, cliprect = "viewport")
})
}
shinyApp(ui, server)
中调用它。
以下示例应该有效：
VLC HTTP requests