把一个bitmap在内存中的数据块 搬到另一个bitmap中

这些纯粹学习代码没啥实际用处

bitmap快速复制数据的方法，比setPixel快

static void  void Main(string[] args)

{

    //截屏代码

    Rectangle rec = Screen.PrimaryScreen.Bounds;

    Bitmap img = new Bitmap(rec.Width, rec.Height);

    Graphics gph = Graphics.FromImage(img);

    gph.CopyFromScreen(new Point(0, 0), new Point(0, 0), rec.Size);



    //将bitmap锁定到系统内存中

    System.Drawing.Imaging.BitmapData bmpData = img.LockBits(rec, System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format16bppRgb555);

    // 获取起始行的地址.

    IntPtr ptr = bmpData.Scan0;

    // 定义一个数组用来保存bitmap的数据.

    int bytes = bmpData.Stride * img.Height;

    byte[] rgbValues = new byte[bytes];

    // 把rgb值拷贝到数组中

    System.Runtime.InteropServices.Marshal.Copy(ptr, rgbValues, 0, bytes);

    img.UnlockBits(bmpData);



    //将数据拷到另一个bitmap中

    Bitmap img2 = new Bitmap(rec.Width, rec.Height);

    Graphics gph2 = Graphics.FromImage(img2);

    System.Drawing.Imaging.BitmapData bmpData2 = img2.LockBits(rec, System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format16bppRgb555);

    IntPtr ptr2 = bmpData2.Scan0;

    System.Runtime.InteropServices.Marshal.Copy(rgbValues, 0, ptr2, bytes);

    img2.UnlockBits(bmpData2);

    img2.Save("asd.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);                                                                                                      

}