/*
* card_write_proc
* ---------------
* This is the core function to try read a card, and maybe recognize it as an NFC tag
* The function is executed in a background thread, so the application's window keeps
* responding during the dialog
*/
private void card_write_proc(object _tag)
{
if (_tag == null)
{
return; /* Oups */
}
if (!(_tag is NfcTag))
{
return; /* Oups */
}
NfcTag tag = _tag as NfcTag;
if (!tag.IsFormatted() && !tag.Format())
{
this.BeginInvoke(new OnErrorInvoker(OnError), "This application has been unable to format the Tag", "Failed to encode the NFC Tag");
return;
}
if (!tag.Write())
{
this.BeginInvoke(new OnErrorInvoker(OnError), "This application has been unable to write onto the Tag", "Failed to encode the NFC Tag");
return;
}
if (cbLock.Visible && cbLock.Checked)
{
/* Try to lock the Tag */
if (tag.IsLockable())
{
if (!tag.Lock())
{
this.BeginInvoke(new OnErrorInvoker(OnError), "This application has been unable to lock the Tag in read-only state", "Failed to encode the NFC Tag");
return;
}
}
else
{
/* This Tag is not locackable */
this.BeginInvoke(new OnErrorInvoker(OnError), "The Tag has been successfully written, but there's no method to put it in read-only state", "This NFC Tag can't be locked");
return;
}
}
/* Done */
this.BeginInvoke(new OnTagWriteInvoker(OnTagWrite), tag);
}
void BtnWriteClick(object sender, EventArgs e)
{
if (tag == null)
{
return; /* Oups */
}
if (control == null)
{
return; /* Oups */
}
if (!control.ValidateUserContent())
{
/* The user did not provide a valid content */
return;
}
Ndef ndef = control.GetContent();
if (ndef == null)
{
MessageBox.Show("Failed to create the NDEF message to be written onto the Tag");
return;
}
tag.Content.Clear();
tag.Content.Add(ndef);
long content_size = tag.ContentSize();
long tag_capacity = tag.Capacity();
if (content_size > tag_capacity)
{
MessageBox.Show("The capacity of the Tag is " + tag_capacity + "B, but the content you're trying to write makes " + content_size + "B", "This Tag is too small");
return;
}
if (!tag.IsEmpty())
{
/* Ask for confirmation before overwriting */
if (MessageBox.Show("The Tag already contains data. Do you really want to overwrite its content?", "Confirm overwrite", MessageBoxButtons.YesNo) != DialogResult.Yes)
{
return;
}
}
if (!tag.IsFormatted())
{
/* Ask for confirmation before formatting */
if (MessageBox.Show("The Tag is not yet formatted. Do you really want to format it?", "Confirm formatting", MessageBoxButtons.YesNo) != DialogResult.Yes)
{
return;
}
}
if (cbLock.Visible && cbLock.Checked)
{
if (!tag.IsLockable())
{
/* The Tag can't be locked */
}
else
{
/* Ask for confirmation before locking */
if (MessageBox.Show("Locking the Tag in read-only state is permanent and can't be cancelled. Are you really sure you want to do this?", "Confirm locking", MessageBoxButtons.YesNo) != DialogResult.Yes)
{
return;
}
}
}
cardthread = new Thread(new ParameterizedThreadStart(card_write_proc));
cardthread.Start(tag);
}