System.CloseFile Function

Terminates the association between file variable and an external disk file.

Pascal

procedure CloseFile(var F);

C++

CloseFile( F);

File

System

Description

Due to naming conflicts, CloseFile replaces the Close procedure. Use the CloseFile procedure instead of Close to terminate the association between a file variable and an external disk file.

F is a file variable of any file type opened using Reset, Rewrite, or Append. The external file associated with F is completely updated and then closed, freeing the file handle for reuse.

Note: {$I+} handles runtime errors using exceptions. When using {$I-}, use IOResult to check for I/O errors.

Delphi Examples:

Copy Code

{
This example reads a file one character at a time and writes
it into a file of your chosing.
}
procedure TForm1.Button1Click(Sender: TObject);
var
  F1, F2: TextFile;
  Ch: Char;
begin
  if OpenDialog1.Execute then begin
    AssignFile(F1, OpenDialog1.Filename);
    Reset(F1);
    if SaveDialog1.Execute then begin
      AssignFile(F2, SaveDialog1.Filename);
      Rewrite(F2);
      while not Eof(F1) do
      begin
        Read(F1, Ch);
        Write(F2, Ch);
      end;
      CloseFile(F2);
    end;
    CloseFile(F1);
  end;
end;

Copy Code

{
Use a TOpenDialog to select a file.  Place the first line of
the file into a TEdit. 
}
procedure TForm1.Edit1Click(Sender: TObject);
var
  F: TextFile;
  S: string;
begin
  if OpenDialog1.Execute then            { Display Open dialog box }
  begin
    AssignFile(F, OpenDialog1.FileName); { File selected in dialog }
    Reset(F);
    Readln(F, S);                        { Read first line of file }
    Edit1.Text := S;                     { Put string in a TEdit control }
    CloseFile(F);
  end;
end;

Copy Code

{
Click the button to open a TOpenDialog, then select a file 
to delete.
}

procedure TForm1.Button1Click(Sender: TObject);
var
  F: Textfile;
begin
  OpenDialog1.Title := 'Delete File';
  if OpenDialog1.Execute then
  begin
    AssignFile(F, OpenDialog1.FileName);
    try
      Reset(F);
      if MessageDlg('Erase ' + OpenDialog1.FileName + '?',
        mtConfirmation, [mbYes, mbNo], 0) = mrYes then
      begin
        CloseFile(F);
        Erase(F);
      end;
    except
      on EInOutError do
        MessageDlg('File I/O error.', mtError, [mbOk], 0);
    end;
  end;
end;