safeFileOpen {widgetTools} | R Documentation |
A function that checks to see if a connection can be made to a given file
Description
This function checks to see if a given file name exists. If so, the function returns a connection to the file. Otherwise, it returns "fileName doest exist".
Usage
safeFileOpen(fileName)
Arguments
fileName |
|
Details
When this function is used, users have to make sure to check to see if the returnd object inherits object "connection". Otherwise, the file doest not exist or a connection has not be made.
Value
The function returns a connection object that inherits class "connection" if the file exists and is opend. Otherwise, the string "fileName doest not exist"
Note
This function is no placed here to be used by various widgets. May be mored to a more suitable place later
Author(s)
Jianhua Zhang
See Also
Examples
write("A test file", "testFile4safeFileOpen")
tt <- safeFileOpen("testFile4safeFileOpen")
inherits(tt, "connection")
unlink("testFile4safeFileOpen")
tt <- safeFileOpen("testFile4safeFileOpen")
inherits(tt, "connection")
[Package widgetTools version 1.74.0 Index]