//activate after click hide message button
private void hideButton_Click(object sender, EventArgs e)
{
bmp = (Bitmap)imagePictureBox.Image;
if (bmp == null)
{
MessageBox.Show("No Image file", "Error");
return;
}
int h = bmp.Height;
int w = bmp.Width;
int pixels = h * w;
string text = dataTextBox.Text;
//check whether image is enough to hold the message
if (pixels * 3 < (text.Length * 8) + 8)
{
MessageBox.Show("Image is not enough", "Error");
return;
}
//check message box is empty
if (text.Equals(""))
{
MessageBox.Show("You have not entered any message ", "Error");
return;
}
// check message is greater than 255 characters
if (text.Length > 255)
{
MessageBox.Show("The text is too big !!! Maximum length is 255", "Error");
return;
}
//check message contain invalid chracters
for (int i = 0; i < text.Length; i++)
{
if (text[i] < 32 || text[i] > 125)
{
MessageBox.Show("Message contain invalid character(s)", "Error");
return;
}
}
bmp = SteganographyOps.embedText(text, bmp);
MessageBox.Show("Message was hidden in the image successfully!", "OK");
dataTextBox.Text = "";
}
//activate after click extract message button
private void extractButton_Click(object sender, EventArgs e)
{
bmp = (Bitmap)imagePictureBox.Image;
if (bmp == null)
{
MessageBox.Show("No Image file", "Error");
return;
}
string extractedText = SteganographyOps.extractText(bmp);
if (extractedText == null || extractedText.Equals(""))
{
MessageBox.Show("Not contain a secret message", "Error");
}
else
{
dataTextBox.Text = extractedText;
}
}