我正在嘗試將影像上傳到 R Shiny 并將影像下載到報告應用程式中。但是當我撰寫報告時，它給了我影像資料而不是影像
關于我在這里做錯了什么的任何想法？一如既往地提前謝謝你
library(shiny)
ui <- fluidPage(
titlePanel('Upload Image Test'),
sidebarLayout(
sidebarPanel(
fileInput(
inputId = "file1",
label = "Upload Image",
accept = c('image/png', 'image/jpeg','image/jpg')
),
tags$hr()),
mainPanel(
textOutput("filename"),
imageOutput(outputId = "uploaded_image"),
downloadButton("report", "Generate report")
)
)
)
server <- function(input, output) {
re1 <- reactive({gsub("\\\\", "/", input$file1$datapath)})
output$uploaded_image <- renderImage({list(src = re1())})
output$report <- downloadHandler(
filename = "report.pdf",
content = function(file) {
tempReport <- file.path(tempdir(), "report.Rmd")
file.copy("report.Rmd", tempReport, overwrite = TRUE)
params <- list(n = input$slider, image = input$file1)
rmarkdown::render(tempReport, output_file = file,
params = params,
envir = new.env(parent = globalenv())
)
}
)
}
shinyApp(ui, server)
報告.Rmd
---
title: "report"
author: "Author"
date: "4/14/2019"
output: pdf_document
params:
image: "Null"
n: "Null"
---
```{r}
params$image
params$n
uj5u.com熱心網友回復：
問題是 RenderImage 將在使用后洗掉檔案，除非 deleteFile = False。這是要更改的行，洗掉此行：
re1 <- reactive({gsub("\\\\", "/", input$file1$datapath)})
添加這個：
output$uploaded_image <- renderImage({list(src = input$file1$datapath)}, deleteFile = FALSE)
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