FileExists (Delphi)

Description

The following code prompts for confirmation before deleting a file. Create a file and then enter the path and file name in the textfields. Click the button to delete it.

VCL Code Snippet

procedure TForm1.Button1Click(Sender: TObject);
var FileName: string;
begin
  Filename:= Edit1.Text;
  if SysUtils.FileExists(FileName) then
  begin
    if MessageDlg(('Do you really want to delete ' + ExtractFileName(FileName) + '?'), mtConfirmation, [mbYes, mbNo], 0, mbNo) = IDYes then
      DeleteFile(FileName);
  end
  else
    MessageDlg(('File ' + ExtractFileName(FileName) + ' does not exist.'), mtConfirmation, [mbOK], 0);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Edit2.Text:= ExtractFilePath(Application.ExeName);
end;

FMX Code Snippet

var
  FullFileName: string;
  FileName: string;
begin
  FullFileName := Edit1.Text;
  FileName := ExtractFileName(FullFileName);
  if FileExists(FullFileName) then
  begin
    TDialogService.MessageDialog(Format('Do you really want to delete "%s"?', [FileName]), TMsgDlgType.mtConfirmation, mbYesNo,
                                TMsgDlgBtn.mbNo, 0,
                                procedure (const AResult: TModalResult) begin
                                  if AResult = mrYes then
                                    DeleteFile(FullFileName);
                                end);
  end
  else
    TDialogService.ShowMessage(Format('File "%s" does not exist.', [FileName]));
end;

Uses

• System.SysUtils.FileExists ( fr | de | ja )
• System.SysUtils.DeleteFile ( fr | de | ja )
• System.SysUtils.ExtractFilePath ( fr | de | ja )
• System.AnsiStrings.ExtractFilePath ( fr | de | ja )