r - 使用 ReporteRs 包通过 R Shiny 生成 powerpoint 幻灯片

Question

我有一个 Shiny 的 R 代码，可以制作各种报告、词云、情感分析和各种其他东西。现在我希望通过单击一个按钮，可以一次下载生成的所有这些报告并附加到 ppt 中。因此，例如它应该看起来像:

幻灯片 1:词云

幻灯片 2:情绪分析

幻灯片 3:报告 1 ...等等

到目前为止，我可以单独下载所有这些报告，即我的 Shiny UI 中有不同的选项卡，对于每个报告，我转到它并单击“下载”，然后由 downloadHandler 下载。

此外，只需单击一下，我就可以将所有这些报告下载到一个 pdf 格式中，即在一页中我有报告 1 等等。

到目前为止，我已经到达以下位置:

    #downloadReport is my action button
    #on click of this button I am expecting the ppt. to be downloaded
    observeEvent(input$downloadReport, {
    # Create a PowerPoint document
    doc = pptx( )

    # Slide 1 : Title slide
    #+++++++++++++++++++++++
    doc <- addSlide(doc, "Title Slide")
    doc <- addTitle(doc,"Create a PowerPoint document from R software")
    doc <- addSubtitle(doc, "R and ReporteRs package")


   # Slide 2 : Add Word Cloud
    #+++++++++++++++++++++++
    doc <- addSlide(doc, "Title and Content")
    doc <- addTitle(doc, "Bar Plot")
    newData=rawInputData(); # Function which captures data (.csv file) when I have input it through R shiny
    words_list = strsplit(as.character(newData$CONTENT), " ") #CONTENT is the column which contains the test data
    words_per_tweet = sapply(words_list, length)
    pptwordcloud<-barplot(table(words_per_tweet), border=NA,main="Distribution of words per tweet", cex.main=1,col="darkcyan")
   #pptwordcloud<-barplot(table(words_per_tweet), col="darkcyan")
    doc <- addPlot(doc, fun= print, x = pptwordcloud,vector.graphic =FALSE ) 
    writeDoc(doc,'file1.pptx')
  })

PPT。正在生成，但通过使用 vector.graphic =FALSE 作为选项，我无法在其中看到条形图。如果我删除它，我会收到此错误

Warning: Unhandled error in observer: javax.xml.bind.UnmarshalException - with linked exception: [org.xml.sax.SAXParseException: The markup in the document preceding the root element must be well-formed.] observeEvent(input$downloadReport)

有人可以指出我的错误吗？

Answer 1

让我们尝试重现=)

1)我没有您的数据，因此我使用iris并选择用于选择表第二列的输入

用户界面

library(shiny)


shinyUI(

  # Use a fluid Bootstrap layout
  fluidPage(    
    selectInput("sel",label = "col",choices = colnames(iris)[2:ncol(iris)]),
    downloadButton('downloadData', 'Download')

  )
)

服务器

library(shiny)
library(DT)
library(ReporteRs)

shinyServer(function(input, output,session) {

  output$downloadData <- downloadHandler(
      filename = "file.pptx",
      content = function(file) {
        doc = pptx( )

        # Slide 1 : Title slide
        #+++++++++++++++++++++++
        doc <- addSlide(doc, "Title Slide")
        doc <- addTitle(doc,"Create a PowerPoint document from R software")
        doc <- addSubtitle(doc, "R and ReporteRs package")


        # Slide 2 : Add Word Cloud
        #+++++++++++++++++++++++
        doc <- addSlide(doc, "Title and Content")
        doc <- addTitle(doc, "Bar Plot")
        #newData=rawInputData(); # Function which captures data (.csv file) when I have input it through R shiny
        #words_list = strsplit(as.character(newData$CONTENT), " ") #CONTENT is the column which contains the test data
        #words_per_tweet = sapply(words_list, length)
        words_per_tweet=iris
        pptwordcloud<-function(){
          barplot(table(words_per_tweet[,c("Sepal.Length",input$sel)]), border=NA,main="Distribution of words per tweet", cex.main=1,col="darkcyan")
        }#pptwordcloud<-barplot(table(words_per_tweet), col="darkcyan")
        doc <- addPlot(doc, fun= pptwordcloud,vector.graphic =FALSE ) 
        writeDoc(doc,file)
       }
     )
  })