Question

以下代码要求用户提供.csv文件的路径，列出.csv文件名的列表，然后将每个.csv文件的内容写到一个.xlsx文件中的工作表中。每个工作表均以.csv文件的原始名称命名。

我的问题是我的某些.csv文件名的长度超过31个字符，这是Excel中工作表名称的限制。

我想将工作表名称放在单元格A1中，将文件内容写在该单元格的下面，并给工作表命名（例如1、2、3 ...），但是我无法包扎头我将如何实现这一目标。任何建议将不胜感激。

library(data.table)  ## for fast fread() function
library(XLConnect)
library(svDialogs)

# Ask user for path to csv files
folder <- dlgInput(title = "Merge csv", "Enter path to csv files (use '/' instead of '\\': ", Sys.info()["user"])$res

setwd(folder)

# Create and load Excel file
wb <- loadWorkbook("Output.xlsx", create=TRUE)

# Get list of csv files
pattern.ext <- "\\.csv$"
files <- dir(folder, full=TRUE, pattern=pattern.ext)

# Use file names for sheet names
files.nms <- basename(files)
files.nms <- gsub(pattern.ext, "", files.nms)

# Set the names to make them easier to grab
names(files) <- files.nms

# Iterate over each csv and output to sheet in Excel with its name
for (nm in files.nms) {

  # Ingest csv file
  temp_DT <- fread(files[[nm]])

  # Create the sheet with the name  
  createSheet(wb, name=nm)

  # Output the contents of the csv 
  writeWorksheet(object=wb, data=temp_DT, sheet=nm, header=TRUE, rownames=NULL)
}

# Remove default sheets
removeSheet(wb, sheet = "Sheet1")
removeSheet(wb, sheet = "Sheet2")
removeSheet(wb, sheet = "Sheet3")

saveWorkbook(wb)

# Check to see if file exists
if (file.exists("Output.xlsx")) {
  dlg_message("Your Excel file has been created.")$res
} else {
  dlg_message("Error: Your file was not created. Please try again.")$res
}

编辑-替代解决方案：

修改后的代码最初使用文件名的子字符串...

# Use substring of file names for sheet names (Excel sheet name limit is 31)
files.nms <- substr(basename(files),1,31)
files.nms <- gsub(pattern.ext, "", files.nms)

最终编辑：添加了欢迎消息，并向用户询问路径，该功能检查路径是否存在。如果不是，它将不断询问用户，直到他们取消或输入现有目录。

library(data.table)  # fread() function
library(XLConnect)   # Excel and csv files
library(svDialogs)   # Dialog boxes

# Welcome message
dlg_message("This program will merge one or more .csv files into one Excel file. When prompted, enter the path 
            where the .csv files are located. Sheet names in the Excel file will consist of a substring of the original filename.")$res

# Function to get user path
getPath <- function() { 
  # Ask for path
  path <- dlgInput("Enter path to .csv files: ", Sys.info()["user"])$res
  if (dir.exists(path)) {
    # If it is, set the path as the working directory
    setwd(path)
  } else {
    # If not, issue an error and recall the getPath function
    dlg_message("Error: The path you entered is not a valid directory. Please try again.")$res
    getPath()
  }
}

# Call getPath function
folder <- getPath()

# Create and load Excel file
wb <- loadWorkbook("Combined.xlsx", create=TRUE)

# Get list of csv files in directory
pattern.ext <- "\\.csv$"
files <- dir(folder, full=TRUE, pattern=pattern.ext)

# Use substring of file names for sheet names (Excel limit) and remove extension 
files.nms <- substr(basename(files),9,39)
files.nms <- gsub(pattern.ext, "", files.nms)

# Set the names 
names(files) <- files.nms

# Iterate over each .csv and output to Excel sheet
for (nm in files.nms) {

  # Read in .csv files 
  df <- fread(files[nm])

  # Create the sheet and name as substr of file name  
  createSheet(object = wb, name = nm)

  # Writes contents of the .csv To Excel
  writeWorksheet(object = wb, data = df, sheet = nm, header = TRUE, rownames = NULL)

  # Create a custom anonymous cell style
  cs <- createCellStyle(wb)

  # Wrap text
  setWrapText(object = cs, wrap = TRUE)

  # Set column width
  setColumnWidth(object = wb, sheet = nm, column = 1:50, width = -1)
}

saveWorkbook(wb)

# Check to see if Excel file exists and is greater than default file size
if (file.exists("Combined.xlsx") & file.size("Combined.xlsx") > 8731) {
  dlg_message("Your Excel file has been created.")$res
} else {
  dlg_message("Error: Your file may not have been created or compelted properly. Please verify and try again if necessary.")$res
}

Answer 1

您是否考虑过使用openxlsx？

它不是Java依赖的，并且功能齐全。

# Load package
library(openxlsx)

# Create workbook
wb <- createWorkbook()

# Define data.frames you want to write (adapt to your scenario)    
df <- c("mtcars", "iris")

# Loop over the length of the dataframes defined above
for(i in 1:length(df)){
    # Create a work sheet and call it the numeric value
    addWorksheet(wb, as.character(i))
    # In the first row, first column, specify the df name
    writeData(wb, i, df[i], startRow = 1, startCol = 1)
    # Write the data.frame to the second row, first column
    writeData(wb, i, eval(parse(text=df[i])), startRow = 2, startCol = 1)
}

# Save workbook
saveWorkbook(wb, "eg.xlsx", overwrite = TRUE)

XLConnect工作表名称过长

1 个答案: