截圖捕捉速度非常緩慢

我正在編寫一個可以截取截圖的應用程序，它需要將它們超快（多個秒）然後處理它們。這裏是我用來做它的代碼 - 它可以工作，但速度非常慢。截圖捕捉速度非常緩慢

using System.Drawing; 
using System.Drawing.Imaging; 

public static Bitmap CaptureScreen() 
{ 
    Bitmap BMP = new Bitmap(System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width, 
          System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height, 
          System.Drawing.Imaging.PixelFormat.Format32bppArgb); 
    System.Drawing.Graphics GFX = System.Drawing.Graphics.FromImage(BMP); 
    GFX.CopyFromScreen(System.Windows.Forms.Screen.PrimaryScreen.Bounds.X, 
         System.Windows.Forms.Screen.PrimaryScreen.Bounds.Y, 
         0, 0, 
         System.Windows.Forms.Screen.PrimaryScreen.Bounds.Size, 
         System.Drawing.CopyPixelOperation.SourceCopy); 

    return BMP; 
}

使用 - ：

Bitmap im1 = new Bitmap(CaptureScreen());

上面的代碼工作正常，但需要至少5秒的處理時間。那麼有人可能會提供一個類似上面的方法，除了更快，我也想用前景窗口捕捉，而不是整個屏幕。

編輯這裏是比較代碼！

private void timer2_Tick(object sender, EventArgs e) 
{ 

    pictureBox1.Image = CaptureScreen(); 
    pictureBox2.Image = CaptureScreenOld(); 
    Bitmap im1 = (Bitmap)pictureBox1.Image; 
    Bitmap im2 = (Bitmap)pictureBox2.Image; 
    for (int y = 0; y < pictureBox1.Height; y++) 
    { 
     for (int x = 0; x < pictureBox1.Width; x++) 
     { 
      // Get the color of the current pixel in each bitmap 
      Color color1 = im1.GetPixel(x, y); 
      Color color2 = im2.GetPixel(x, y); 

      // Check if they're the same 
      if (color1 != color2) 
      { 
       // If not, generate a color... 
       Color myRed = Color.FromArgb(90, 0, 0); 
       // .. and set the pixel in one of the bitmaps 
       im2.SetPixel(x, y, myRed); 
       pictureBox2.Image = im2; 
      } 
     } 
    } 
}

來源

2012-12-18 user1911675

相關：http://stackoverflow.com/questions/1163761/c-sharp-capture-screenshot-of-active-window – Vulcan

你需要做什麼與圖像？爲什麼你將整個圖像重新複製到另一個「位圖」？ '位圖im1 = CaptureScreen（）;'應該節省很多時間。和*五*秒？我需要更少的時間來在屏幕截圖上運行框模糊......這個屏幕有多大？ – Ryan

在我的系統（1680 x 1050分辨率）上運行相同的代碼約120ms。 –

沒關係，用GetPixel一堆次比較的像素是真的慢。將你的位鎖定在一個數組中：

private static void CompareBitmaps(Bitmap a, Bitmap b) { 
    Stopwatch sw = new Stopwatch(); 

    sw.Start(); 

    var lockRect = new Rectangle(0, 0, a.Width, a.Height); 
    BitmapData ad = a.LockBits(lockRect, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb); 
    BitmapData bd = b.LockBits(lockRect, ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb); 

    Int32[] apixels = new Int32[ad.Width * ad.Height]; 
    Int32[] bpixels = new Int32[bd.Width * bd.Height]; 

    Marshal.Copy(ad.Scan0, apixels, 0, apixels.Length); 
    Marshal.Copy(bd.Scan0, bpixels, 0, bpixels.Length); 

    for(int i = 0; i < apixels.Length; i++) { 
     if(apixels[i] != bpixels[i]) { 
      unchecked { 
       bpixels[i] = (int)0xff5a0000; 
      } 
     } 
    } 

    Marshal.Copy(bpixels, 0, bd.Scan0, bpixels.Length); 

    a.UnlockBits(ad); 
    b.UnlockBits(bd); 

    sw.Stop(); 

    Console.WriteLine("CompareBitmaps took {0}.", sw.Elapsed); 
}

我得到約240毫秒的時間;這夠了嗎？

來源

2012-12-18 04:49:43 Ryan

截圖捕捉速度非常緩慢

回答

相關問題