/*
The following example uses a button, a string grid, and a
Save dialog box on a form. When the button is clicked, the
user is prompted for a filename. When the user clicks OK,
the contents of the string grid are written to the specified
file. Additional information is also written to the file so
that it can be read easily with the FileRead function.
*/

#include <dir.h>

void __fastcall TForm1::Button1Click(TObject *Sender)
{
  char szFileName[MAXFILE+4];
  int iFileHandle;
  int iLength;
  if (SaveDialog1->Execute())
  {
    if (FileExists(SaveDialog1->FileName))
    {
      fnsplit(SaveDialog1->FileName.c_str(), 0, 0, szFileName, 0);
      strcat(szFileName, ".BAK");
      RenameFile(SaveDialog1->FileName, szFileName);
    }
    iFileHandle = FileCreate(SaveDialog1->FileName);
    // Write out the number of rows and columns in the grid.
    FileWrite(iFileHandle, (char*)&(StringGrid1->ColCount), sizeof(StringGrid1->ColCount));
    FileWrite(iFileHandle, (char*)&(StringGrid1->RowCount), sizeof(StringGrid1->RowCount));
    for (int x=0;x<StringGrid1->ColCount;x++)
    {
      for (int y=0;y<StringGrid1->RowCount;y++)
      {
        // Write out the length of each string, followed by the string itself.
        iLength = StringGrid1->Cells[x][y].Length();
        FileWrite(iFileHandle, (char*)&iLength, sizeof(iLength));
        FileWrite(iFileHandle, StringGrid1->Cells[x][y].c_str(), StringGrid1->Cells[x][y].Length());
      }
    }
    FileClose(iFileHandle);
  }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
  StringGrid1->Cells[1][0] = "Column 1";
  StringGrid1->Cells[2][0] = "Column 2";
  StringGrid1->Cells[3][0] = "Column 3";
  StringGrid1->Cells[4][0] = "Column 4";
  StringGrid1->Cells[0][1] = "Row 1";
  StringGrid1->Cells[1][1] = "Object";
  StringGrid1->Cells[2][1] = "Pascal";
  StringGrid1->Cells[3][1] = "is";
  StringGrid1->Cells[4][1] = "excellent";
  StringGrid1->Cells[0][2] = "Row 2";
  StringGrid1->Cells[1][2] = "Delphi";
  StringGrid1->Cells[2][2] = "is";
  StringGrid1->Cells[4][2] = "RAD";
};

{
The following example uses a button, a string grid, and a
Save dialog box on a form. When the button is clicked, the
user is prompted for a filename. When the user clicks OK,
the contents of the string grid are written to the specified
file. Additional information is also written to the file so
that it can be read easily with the FileRead function.
} 
procedure TForm1.Button1Click(Sender: TObject);
var
  BackupName: string;
  FileHandle: Integer;
  StringLen: Integer;
  X, Y, I: Integer;
  colCountLength, rowCountLength: Integer;
  Buffer: PChar;
  cellString: string;
begin
  if SaveDialog1.Execute then
  begin
    if FileExists(SaveDialog1.FileName) then
    begin
      BackupName := SysUtils.ExtractFileName(SaveDialog1.FileName);
      BackupName := ChangeFileExt(BackupName, '.BAK');
      if not RenameFile(SaveDialog1.FileName, BackupName) then
        raise Exception.Create('Unable to create backup file.');
    end;
    FileHandle := FileCreate(SaveDialog1.FileName);
    { Write out the number of rows and columns in the grid. }
    colCountLength := SizeOf(StringGrid1.ColCount);
    FileWrite(FileHandle, 
      Pchar(StringGrid1.ColCount), colCountLength);
    rowCountLength := SizeOf(StringGrid1.RowCount);
    FileWrite(FileHandle,
      PChar(StringGrid1.RowCount), rowCountLength);
    for X := 0 to StringGrid1.ColCount - 1 do
    begin
      for Y := 0 to StringGrid1.RowCount - 1 do
      begin
        try
          { Write out the length of each string, followed by the string itself. }
          StringLen := Length(StringGrid1.Cells[X,Y]);
          FileWrite(FileHandle, PChar(StringLen), SizeOf(StringLen));
          GetMem(Buffer, StringLen); { allocate the buffer }
          cellString := StringGrid1.Cells[X,Y];
          for I := 1 to StringLen do
             Buffer[I - 1] := cellString[I];
          FileWrite(FileHandle, Buffer^, StringLen);
        finally
          FreeMem(Buffer, StringLen);
        end;
      end;
    end;
    FileClose(FileHandle);
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  with StringGrid1 do
  begin
    Cells[1,0] := 'Column 1';
    Cells[2,0] := 'Column 2';
    Cells[3,0] := 'Column 3';
    Cells[4,0] := 'Column 4';
    Cells[0,1] := 'Row 1';
    Cells[1,1] := 'Object';
    Cells[2,1] := 'Pascal';
    Cells[3,1] := 'is';
    Cells[4,1] := 'excellent';
    Cells[0,2] := 'Row 2';
    Cells[1,2] := 'Delphi';
    Cells[2,2] := 'is';
    Cells[4,2] := 'RAD';
  end;
end;

{
This example uses a file listbox and a regular listbox on a
form. The following routine scans through the files listed
in the file listbox and lists the sizes of any selected
files to the regular list box.  To exercise the error
condition create a file in the Debug directory, start this
application and then delete the file.  Now try to list the
size of the deleted file.  Set the MultiSelect and
ExtendedSelect properties on the FileListBox.
}
procedure TForm1.Button1Click(Sender: TObject);
var
  F: File;
  i, filehandle: Integer;
begin
  for i := 0 to (FileListBox1.Items.Count - 1) do begin
  try
    if FileListBox1.Selected[i] then 
    begin
      if not FileExists(FileListBox1.Items.Strings[i]) then
      begin
        MessageDlg('File: ' + FileListBox1.Items.Strings[i] +
                   ' not found', mtError, [mbOk], 0);
        Continue;
      end;
      filehandle:=  FileOpen(FileListBox1.Items.Strings[i], 1);
      if (filehandle = -1) then
      begin
        MessageDlg('File: ' + FileListBox1.Items.Strings[i] +
                   ' cannot be opened with access mode 1.', mtError, [mbOk], 0);
        Continue;
      end
      else
        FileClose(filehandle);

      AssignFile(F, FileListBox1.Items.Strings[i]);
      Reset(F, 1);
      ListBox1.Items.Add(
        FileListBox1.Items.Strings[i] + ': ' + IntToStr(FileSize(F)));
      CloseFile(F);
    end;
   finally
   { do something here }
   end;
  end;
end;