/********************************************************************
* Event handler for the File>Save menu item
* will take the records that are currently being accessed and write them
* to the file with the name of the media.
**********************************************************************/
private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
//Gets the active child form to determine if it is already opened or not
RecordsForm R = this.ActiveMdiChild as RecordsForm;
if (R == null)
{
MessageBox.Show("No form is currently displayed.", "Error");
}
//Since there is a form open, we can now write the records to a file
else
{
//Define variables needed for writing
string file;
media = R.getMedia();
file = media + ".inv";
Records = R.getRecords();
//Write to file
write = new FileStream(file, FileMode.OpenOrCreate, FileAccess.Write);
if (Records.Count > 0)
{
bf.Serialize(write, Records);
}
write.Close();
MessageBox.Show("Records have been saved to " + file, "Done!");
}
}
/********************************************************************
* Loads the records into the Records variable. Does not return or require any variables
* Using FileStream and BinaryFormatter, this function reads from the specified file
* and loads the records from that file into the Records variable where they
* can then be used throughout the program.
**********************************************************************/
private void loadRecords()
{
//Gets the active child form to determine if it is already opened or not
RecordsForm R = this.ActiveMdiChild as RecordsForm;
int numChildren = this.MdiChildren.Length;
if (R != null || numChildren == 2)
{
MessageBox.Show("Only one form at a time, please.", "Error");
}
//Since it is not already openened, the function will read the records from the file and
// display them on a new RecordsForm
else
{
//Shows a new records form (blank)
R = new RecordsForm(Records, media);
R.MdiParent = this;
R.Show();
//Determines which media we are wanting and reads form the corresponding file
string file = R.getMedia() + ".inv";
Records.Clear(); //Clears the records in case we are using a different media
read = new FileStream(file, FileMode.OpenOrCreate, FileAccess.Read);
if (read.Length > 0)
{
Records = bf.Deserialize(read) as List <Record>;
}
//Calls the refresh function which displays the records on the RecordsForm
R.refresh(Records);
read.Close();
}
}