private void ExtractAllButton_Click(object sender, EventArgs e)
{
string decoded;
string folder = UrlTextBox.Text;
Bitmap temp;
// directory does not exist
if (Directory.Exists(folder) == false)
{
return;
}
DecryptAllTextBox.Text = string.Empty;
// get the files in the folder
var files = Directory.GetFiles(folder);
foreach (var f in files)
{
// if it is an image file
if (ImageExtensions.Contains(Path.GetExtension(f).ToUpperInvariant()))
{
// get the image file and extract the data
temp = ImageToBMP(f);
decoded = Steg.Extract(temp);
// hidden text was found, so display
if (decoded != string.Empty)
{
DecryptAllTextBox.Text += f.Substring(f.LastIndexOf("\\") + 1)
+ Environment.NewLine + decoded + Environment.NewLine + Environment.NewLine;
}
}
}
}
// user encodes the data
private void EncodeButton_Click(object sender, EventArgs e)
{
text = WordsTextBox.Text;
// if the user wants to encrypt the text
if (PasswordCheckBox.Checked == true)
{
text = StringCipher.Encrypt(WordsTextBox.Text, PasswordTextBox.Text);
}
// exit if there is no bmp file or it is too small
if (ValidDetails() == false)
{
return;
}
bmp = Steg.Embed(text, bmp);
SaveFileDialog sfd = new SaveFileDialog();
sfd.Title = "Save Image";
sfd.DefaultExt = "png";
sfd.Filter = "Png files (*.png)|*.png";
sfd.FilterIndex = 2;
sfd.RestoreDirectory = true;
if (sfd.ShowDialog() == DialogResult.OK)
{
bmp.Save(sfd.FileName, ImageFormat.Png);
}
}
private void hideButton_Click(object sender, EventArgs e)
{
Bitmap bmp = (Bitmap)imagePictureBox.Image;
if (message.Text.Equals("") == true)
{
MessageBox.Show("The text you want to hide can't be empty", "Warning");
}
bmp = new Steg().hideText(message.Text, bmp);
}
// user decodes data
private void DecodeButton_Click(object sender, EventArgs e)
{
// exit if there is no bmp file
if (ValidDetails() == false)
{
return;
}
string decoded = Steg.Extract(bmp);
// decrypt for the user
if (PasswordCheckBox.Checked == true)
{
try
{
decoded = StringCipher.Decrypt(decoded, PasswordTextBox.Text);
}
catch (System.Security.Cryptography.CryptographicException)
{
MessageBox.Show(
"Image or password is incorrect.",
"Invalid Input",
MessageBoxButtons.OK,
MessageBoxIcon.Warning);
return;
}
catch (System.FormatException)
{
MessageBox.Show(
"Image was not large enough to hide all text, and therefore the text cannot be extracted.",
"Image Size Error",
MessageBoxButtons.OK,
MessageBoxIcon.Warning);
return;
}
}
decoded = "Decoded text:" + Environment.NewLine + decoded;
WordsTextBox.Text = decoded;
}
