private void BtnReadFile_Click(object sender, EventArgs e)
{
const int TASIZE = 2;
TxtDisplayData.Clear();
TxtDisplayData.Text = "Filename will be displayed here!";
openDlg = new OpenFileDialog();
openDlg.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
openDlg.Filter = "All Files (*.*)|*.*|Text Files (*.txt)|*.txt";
openDlg.FilterIndex = 2;
string data = null;
string tdata = null;
string[] adata = new string[TASIZE];
try
{
if (openDlg.ShowDialog() == DialogResult.OK)
{
if ((fs = (FileStream)(openDlg.OpenFile())) != null)
{
strRdr = new StreamReader(fs);
TxtDisplayData.Clear();
TxtDisplayData.Text = openDlg.FileName;
for (int idx = 0; idx < grades.Length; idx++)
{
data = strRdr.ReadLine();
if (data == null || data == "")
{
grades[idx] = -1.0;
return;
}
else
{
adata = data.Split();
grades[idx] = double.Parse(adata[1]);
tdata = string.Format("{0}\t{1:F2}\r\n", adata[0], grades[idx]);
TxtDisplayData.AppendText(tdata);
}
}
if (strRdr != null)
{
strRdr.Close();
}
fs.Close();
}
else
{
throw new IOException("File failed to open");
}
}
else
{
throw new Exception("File Open Cancelled");
}
}
catch (IOException ioexp)
{
MessageBox.Show("File " + saveDlg.FileName + ioexp.Message, "File Open Failed",
MessageBoxButtons.OK, MessageBoxIcon.Error);
}
catch (Exception exp)
{
MessageBox.Show(exp.Message, "Open Cancelled", MessageBoxButtons.OK,
MessageBoxIcon.Information);
}
}//End BtnReadFile_Click( )
}//End BtnReadFile_Click( )
private void BtnWriteFile_Click(object sender, EventArgs e)
{
BtnRead.Enabled = true;
TxtDisplayData.Clear();
TxtFileStatus.Text = "Filename or other status will be displayed here!";
saveDlg = new SaveFileDialog();
saveDlg.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
saveDlg.Filter = "All Files (*.*)|*.*|Text Files (*.txt)|*.txt";
saveDlg.FilterIndex = 2;
try
{
if ((dlgResult = saveDlg.ShowDialog()) == DialogResult.OK)
{
if ((_fs = (FileStream)saveDlg.OpenFile()) != null)
{
_strmWrt = new StreamWriter(_fs);
TxtFileStatus.Text = saveDlg.FileName;
for (int idx = 0; idx < ASIZE; idx++)
{
_strmWrt.WriteLine(msg + idx + "\t" + data);
TxtDisplayData.AppendText(string.Format("{0}\t{1:F2}\r\n", msg + idx, data));
data += inc;
}
}
else if (dlgResult == DialogResult.Cancel)
{
throw new IOException("File Open \"Cancelled!\"");
}
}
else
{
throw new Exception("Unknown DialogResult!");
}
}
catch (IOException ioexp)
{
MessageBox.Show("File " + saveDlg.FileName + ioexp.Message,
"File Open Failed", MessageBoxButtons.OK, MessageBoxIcon.Error);
BtnRead.Enabled = false;
}
catch (Exception exp)
{
MessageBox.Show(exp.Message, "Open Cancelled",
MessageBoxButtons.OK, MessageBoxIcon.Information);
BtnRead.Enabled = false;
}
finally
{
openDlg = null;
saveDlg = null;
if (_strmWrt != null)
{
_strmWrt.Close();
_strmWrt = null;
}
if (_fs != null)
{
_fs.Close();
_fs = null;
}
}
}