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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using System.Drawing.Imaging;
using System.IO;
using System.Threading;
using System.Runtime.InteropServices;
namespace WinCryptImage
{
public partial class frmBitmapData : Form
{
private string appPath = Directory.GetCurrentDirectory() + "/Resources/";
public frmBitmapData()
{
InitializeComponent();
this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
this.pictureBox2.SizeMode = PictureBoxSizeMode.Zoom;
}
private void button1_Click(object sender, EventArgs e)
{
Bitmap bmp = (Bitmap)Image.FromFile(appPath + "Nenuphars.jpg");
this.pictureBox1.Image = bmp;
Bitmap gray = ConvertTo16bpp(bmp);
MessageBox.Show("conversion format :" + gray.PixelFormat.ToString().ToString());
Crypter(gray);
}
private void button2_Click(object sender, EventArgs e)
{
Decrypter(textBox1.Text.Length );
}
public void Crypter(Bitmap bmp)
{
string txt = textBox1.Text;
int length = txt.Length;
//---------------utilise BitmapData
Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
BitmapData data = bmp.LockBits(rect, ImageLockMode.ReadWrite, bmp.PixelFormat );
IntPtr ptrPixel = data.Scan0;
Byte[] bytes = new byte[data.Stride * data.Height];
// Copy RGB to array.
Marshal.Copy(ptrPixel, bytes, 0, bytes.Length);
//assigne 1er octet
byte R1 =(byte) length;
bytes[0] = R1;
int count = 0;
for (int i = 0; i < length ; i++)
{
R1 = (byte)txt[i];
//saut de ligne
data.Stride++;
bytes[data.Stride + count] = R1;
count++;
}
// Copy back to the bitmap
Marshal.Copy(bytes, 0, ptrPixel, bytes.Length);
//save format bmp non compresse
bmp.UnlockBits(data);
bmp.Save(appPath + "crypt.png", ImageFormat.Png );
MessageBox.Show("Cryptage Effectué");
this.pictureBox2.Image = bmp;
}
//SIGNATURE EXIGE LE PARAM lenText
public void Decrypter(int lenTxt)
{
Bitmap bmp = (Bitmap)Image.FromFile(appPath + "crypt.png");
MessageBox.Show("format :" + bmp.PixelFormat.ToString().ToString());
//---------------utilise BitmapData
//---------------changement :le rectangle de la zone à lire
//---------------pixelformat de la zone:Format16bppRgb555
Rectangle rect = new Rectangle(0, 0, lenTxt, lenTxt);
BitmapData data = bmp.LockBits(rect,
ImageLockMode.ReadWrite,
PixelFormat.Format16bppRgb555);
IntPtr ptrPixel = data.Scan0;
Byte[] bytes = new byte[data.Stride * data.Height];
// Copy RGB to array.
Marshal.Copy(ptrPixel, bytes, 0, bytes.Length);
//lit nbre cars
byte R1 = bytes[0];
int length = R1 ;
string txt = string.Empty;
txt += "nb cars :" + length.ToString() + Environment.NewLine;
int count = 0;
for (int i = 0; i <length; i++)
{
//saut de ligne
data.Stride++;
R1 = bytes[data.Stride + count];
txt += " " + (Char)R1;
count++;
}
textBox2.Text = txt;
bmp.UnlockBits(data);
MessageBox.Show("Decryptage Fini");
}
//Utilitaire conversion format Format16bppRgb555
public Bitmap ConvertTo16bpp(Image img)
{
//cree un bitmap format Format16bppRgb555
var bmp = new Bitmap(img.Width, img.Height, PixelFormat.Format16bppRgb555);
// dessine original dessus
using (var gr = Graphics.FromImage(bmp))
gr.DrawImage(img, new Rectangle(0, 0, img.Width, img.Height));
return bmp;
}
private static void EncodeAsPNG(Bitmap bmp,string path)
{
ImageCodecInfo myImageCodecInfo;
Encoder myEncoder;
EncoderParameter myEncoderParameter;
EncoderParameters myEncoderParameters;
// ImageCodecInfo that represents PNG codec.
myImageCodecInfo = GetEncoderInfo("image/png");
// Encoder object based on the GUID for the ColorDepth
myEncoder = Encoder.ColorDepth;
// array EncoderParameters object.
// only one EncoderParameter in the array.
myEncoderParameters = new EncoderParameters(1);
// Save image with a color depth of 24 bits per pixel.
myEncoderParameter =
new EncoderParameter(myEncoder, 24L);
myEncoderParameters.Param[0] = myEncoderParameter;
bmp.Save(path + "Shape.png", myImageCodecInfo, myEncoderParameters);
}
}
} |
