private async void Merge(object sender, RoutedEventArgs e)
{
//Encryption and security made this function more than two times bigger :).
SecureString pass = null;
//The number of files.
int count = 0;
//Title of first item.
string ci = null, result = null;
if (FilesBox.Items.Cast <ListBoxItem>().Any(x => x.Tag != null) & MessageDialogResult.Affirmative == await this.ShowMessageAsync("Password protected pdf", "One or more of the pdfs you are merging are password protected. Do you want to protect the merged pdf with a pasword?", MessageDialogStyle.AffirmativeAndNegative, new MetroDialogSettings()
{
AffirmativeButtonText = "Yes", NegativeButtonText = "No"
}))
{
result = await this.ShowInputAsync("Enter the password for the merged pdf", "Password contain anything");
if (!String.IsNullOrEmpty(result))
{
//Set the password as the input text.
pass = result.ToSecureString();
//Get GCHandle of result.
GCHandle gchandle = GCHandle.Alloc(result, GCHandleType.Pinned);
//Clear it from memory and replace it with junk data.
ClearIntPtr(gchandle.AddrOfPinnedObject(), result.Length * sizeof(char));
//Free GCHandle
gchandle.Free();
pass.MakeReadOnly();
}
}
else
{
//Set the password to null if the user types nothing or clicks cancel.
pass = null;
}
//To get the button click animation to show. We need to open the Microsoft.Win32.SaveFileDialog in a new thread.
new System.Threading.Thread(new System.Threading.ThreadStart(delegate()
{
Dispatcher.Invoke(new Action(() =>
{
//Set count.
count = FilesBox.Items.Count;
//Set current item.
ci = ((ListBoxItem)FilesBox.Items[0]).Content.ToString();
}));
//Initailize the open file dialog and title.
SaveFileDialog saveFileDialog = new Microsoft.Win32.SaveFileDialog()
{
Title = count > 1 ? String.Format("Merging {0} File(s)", count) : String.Format("Converting {0}", ci)
};
//If user clicks ok.
if (saveFileDialog.ShowDialog() == true)
{
using (Combiner comb = new Combiner(pass))
{
//Set output path.
comb.Output = saveFileDialog.FileName;
//Name of the file.
string n = null;
Stopwatch sw = new Stopwatch();
//Start stopwatch to check merge time.
sw.Start();
Parallel.For(0, count, i =>
{
SecureString tag = null;
Dispatcher.Invoke(new Action(() =>
{
var item = ((ListBoxItem)FilesBox.Items[i]);
n = item.Content.ToString();
tag = (SecureString)item.Tag;
}));
comb.AddFile(File.ReadAllBytes(n), Combiner.ProtectPassword((SecureString)tag));
if (tag != null)
{
tag.Dispose();
}
});
//Stop stopwatch.
sw.Stop();
Debug.WriteLine("Time to merge pdfs in memory {0}", sw.Elapsed.ToString());
}
}
if (!String.IsNullOrEmpty(saveFileDialog.FileName))
{
//Open the pdf file
System.Diagnostics.Process.Start(saveFileDialog.FileName);
}
})).Start();
}
