ExtraTopLevelOperators.fprintfn<'T> Function (F#)
The fprintfn prints to a file using the given format, and add a newline.
Namespace/Module Path: Microsoft.FSharp.Core.ExtraTopLevelOperators
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature:
fprintfn : TextWriter -> TextWriterFormat<'T> -> 'T
// Usage:
fprintfn textWriter format
Parameters
textWriter
Type: TextWriterformat
Type: TextWriterFormat<'T>
Remarks
This function is named PrintFormatLineToTextWriter in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.
Example
The following example demonstrates the use of fprintfn to print a listing of the contents of a directory to a specified file, directorylisting.txt.
let fileName = "directoryListing.txt"
let printDirectoryInfo (dirName:string) (fileName:string) =
use file = System.IO.File.CreateText(fileName)
System.IO.Directory.EnumerateFileSystemEntries(dirName)
|> Seq.iter (fun elem -> fprintfn file "%s" elem )
printDirectoryInfo @"C:\" fileName
printfn "%s" (System.IO.File.OpenText(fileName).ReadToEnd())
The following example is similar to the previous except that it also demonstrates the use of specifiers to customize the output in the format string. For more information on format specifiers, see Printf Module.
let fileName = "directoryListingXY.txt"
let printDirectoryInfo (dirName:string) (fileName:string) =
use file = System.IO.File.CreateText(fileName)
System.IO.Directory.EnumerateDirectories(dirName)
|> Seq.map (fun elem -> new System.IO.DirectoryInfo(elem))
|> Seq.iter (fun elem -> fprintfn file "%50s %A" elem.FullName elem.LastAccessTime )
System.IO.Directory.EnumerateFiles(dirName)
|> Seq.map (fun elem -> new System.IO.FileInfo(elem))
|> Seq.iter (fun elem -> fprintfn file "%50s %A" elem.FullName elem.LastAccessTime )
printDirectoryInfo @"C:\" fileName
printfn "%s" (System.IO.File.OpenText(fileName).ReadToEnd())
Platforms
Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2
Version Information
F# Runtime
Supported in: 2.0, 4.0
Silverlight
Supported in: 3