【发布时间】:2018-12-04 11:28:21
【问题描述】:
我有一个 Shiny 应用程序,它允许通过 downloadHandler() 创建 PDF 报告。我在 .Rmd 文件中包含一个外部图像文件。当我单独编织 .Rmd 文件时,会显示此图像。当我通过 Shiny 应用程序(调用 .Rmd 文件)生成 PDF 报告时,找不到图像并且无法生成报告。我做错了什么?
Shiny 应用的相关部分:
output$report <- downloadHandler(
filename = "report.pdf",
content = function(file) {
# Copy the report file to a temporary directory before processing it, in
# case we don't have write permissions to the current working dir (which
# can happen when deployed).
tempReport <- file.path(tempdir(), "report.Rmd")
file.copy("report.Rmd", tempReport, overwrite = TRUE)
abs_kontr <- "test variable"
# Set up parameters to pass to Rmd document
params <- list(abs_kontr = abs_kontr)
# Knit the document, passing in the `params` list, and eval it in a
# child of the global environment (this isolates the code in the document
# from the code in this app).
rmarkdown::render(tempReport, output_file = file,
params = params,
envir = new.env(parent = globalenv())
)
}
)
这是我的 .Rmd 文件的相关部分:
---
output:
pdf_document:
latex_engine: xelatex
fig_caption: yes
number_sections: true
params:
abs_kontr: NA
mainfont: Calibri
fontsize: 12pt
header-includes:
- \usepackage{fancyhdr}
- \pagestyle{fancy}
- \fancyhead[]{}
- \fancyfoot[LO,LE]{`r format(Sys.time(), "%B %Y")`}
- \renewcommand{\footrulewidth}{0.4pt}
- \renewcommand{\headrulewidth}{0pt}
- \usepackage{sectsty}
- \setsansfont[Ligatures=TeX]{Arial Narrow}
- \sectionfont{\sffamily\Huge}
- \subsectionfont{\sffamily\huge}
- \subsectionfont{\sffamily\LARGE}
---
\thispagestyle{empty}
\linespread{1}
\begin{flushright}
```{r echo=FALSE, out.width="100%", fig.align='right'}
knitr::include_graphics("www/logo.jpg")
```
“knitr::include_graphics("www/logo.jpg")”是我直接编译文档时工作的部分,但当我通过 Shiny 应用程序调用 pdf 创建时不工作。当我想通过 Shiny 应用程序下载报告时,需要几秒钟才能重定向到指示代码崩溃的“找不到文件”页面。
【问题讨论】:
标签: r shiny r-markdown