R闪亮应用程序中自动删除的临时文件-文件错误:无法打开连接 [英] Temp files automatically deleted in R shiny app - Error in file: cannot open the connection

问题描述

我创建了一个使用批处理文件自动运行的 R 闪亮应用程序.启动应用程序时一切正常，但第二天它崩溃了，我收到以下消息:

I created a R shiny app that automatically runs every day using a batch file. Everything works fine when lauching the app, but the next day it crashes and I get the following message:

Warning in file(open = "w+") :
  cannot open file
'C:UsersertinAppDataLocalTempRtmpKiBPOURf3f835d1a66' : No such file or directory
Warning: Error in file: cannot open the connection
  [No stack trace available]

实际上这个问题与由 R 会话执行闪亮的应用程序创建的 tempdir() 文件夹有关.此文件夹会在一定时间后自动删除.我是否必须在每次刷新时删除所有临时文件?或者相反，是否需要防止 R 删除 Temp 文件夹中所有闪亮的临时文件?谢谢！

Actually this issue is related to the tempdir() folder created by the R session executing the shiny app. This folder is automatically deleted after a certain time. Do I have to delete all Temp files on each refreshing? Or on the contrary is it needed to prevent R from deleting all shiny temp files on Temp folder? Thanks!

编辑 - 以下是故意生成错误的方法:

Edit - Here is how to intentionally generate the error:

tempdir()
dir.exists(tempdir())

library(shiny)

# Windows shell required
shinyApp(
    ui = fluidPage("Please reload to see me fail."),
    server = function(input, output) {
        shell(paste("rmdir", dQuote(
            normalizePath(tempdir(), winslash = "/", mustWork = FALSE), q = FALSE
        ), "/s /q"))
    }
)

推荐答案

现在我在 Windows 10 (Storage Sense) 中找到了一个关于删除临时文件的设置，它似乎默认处于活动状态.

By now I've found a setting in Windows 10 (Storage Sense) concerning the deletion of temporary files, which seems to be active by default.

如下导航并取消选中:

1. 设置
2. 系统存储
3. 存储感知
4. 改变我们自动释放空间的方式
5. 删除我的应用未使用的临时文件

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