| Description |
The FileSize function gives the size in records of an open file.
Before this function can be used, the file must be assigned a handle by using AssignFile and opened using Append, Reset or ReWrite routines.
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| Notes |
Because text files are normally variable in length, the number of records is not so useful. Use the low level routine GetFileSize to get the size in bytes, or FindFirst, FindNext routines, which return size and last modified date values of one or more files.
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| Related commands |
| DiskFree |
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Gives the number of free bytes on a specified drive |
| DiskSize |
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Gives the size in bytes of a specified drive |
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| Example code : Get the size in records of a typed binary file |
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
unit Unit1;
interface
uses
// The System unit does not need to be defined
SysUtils,
Forms, Dialogs;
type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm} // Include form definitions
procedure TForm1.FormCreate(Sender: TObject);
var
myWord, myWord1, myWord2, myWord3 : Word;
myFile : File of Word;
begin
// Try to open the Test.cus binary file in write only mode
AssignFile(myFile, 'Test.cus');
ReWrite(myFile);
// Before writing to the file, show the file size
ShowMessage('File size = '+IntToStr(FileSize(myFile)));
// Write a few lines of Word data to the file
myWord1 := 123;
myWord2 := 456;
myWord3 := 789;
Write(myFile, myWord1, myWord2, myWord3);
// Before closing the file, show the new file size
ShowMessage('File size now = '+IntToStr(FileSize(myFile)));
// Close the file
CloseFile(myFile);
end;
end.
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| Hide full unit code |
File size = 0
File size now = 3
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