Name
FileSize Function
Syntax
function FileSize(var F: File): LongInt; function FileSize(var F: TextFile): LongInt;
Description
FileSize
returns the size in records of the file
F
. If F
is a
TextFile
, the record size is arbitrarily chosen as
the buffer size, which defaults to 128. If F is an untyped binary
file, the record size is determined when the file is opened.
FileSize
is not a real
function.
Errors
If the file
F
is not open,FileSize
reports I/O error 103.Real text files don’t have fixed-size records, so
FileSize
is useless for text files. Use streams or call the Windows API functionGetFileSize
instead of callingFileSize
.
// Return the size in bytes of a text file or -1 for an error. function TextFileSize(var F: TextFile): LongInt; begin case TTextRec(F).Mode of fmInput, fmOutput: Result := GetFileSize(TTextRec(F).Handle, nil); else Result := -1; end; end;
FileSize
does not support files larger than 2 GB. See theFileSeek
function in theSysUtils
unit, or call the Windows API for large files.
See Also
Eof Function, File Keyword, FilePos Function, IOResult Function, Reset Procedure, Rewrite Procedure, Seek Procedure, TextFile Type, Truncate Procedure |
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