XLConnect工作表名称太长

Question

下面的代码向用户询问.csv文件的路径，列出.csv文件名，然后将每个.csv文件的内容写入一个.xlsx文件中的工作表中。每个工作表都是根据.csv文件的原始名称命名的。

我的问题是，我的一些.csv文件名超过31个字符，这是工作表名称在Excel中的限制。

我想将工作表名称放在单元格A1中，将文件的内容写在下面，并给工作表一个名称(例如，1、2、3.)，但是我无法思考如何完成这个任务。如有任何建议，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：

修改后的代码最初接受文件名的子字符串.

# 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)

最后编辑:添加欢迎消息和函数询问用户路径，这将检查路径是否存在。如果没有，它将不断询问用户，直到他们取消或输入一个现有的目录。

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

你考虑过使用openxlsx吗？

它不依赖于java，而且功能非常完整。

# 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)