如何在C＃中检测监视器上像素的颜色？

Question

我需要在显示器上检测像素的颜色。 如何在C＃中的坐标（x，y）上检索它？

Answer 1

使用Graphics.CopyFromScreen复制1x1位图，Bitmap.GetPixel（）以获取其颜色。

Answer 2

首先导入这些Dll

    [DllImport("user32.dll")]    
    static extern IntPtr GetDC(IntPtr hwnd);

    [DllImport("user32.dll")]
    static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

    [DllImport("gdi32.dll")]
    static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);

然后编写此方法GetPixelColor（x，y）;

      static public System.Drawing.Color GetPixelColor(int x, int y)
      {
       IntPtr hdc = GetDC(IntPtr.Zero);
       uint pixel = GetPixel(hdc, x, y);
       ReleaseDC(IntPtr.Zero, hdc);
       Color color = Color.FromArgb((int)(pixel & 0x000000FF),
                    (int)(pixel & 0x0000FF00) >> 8,
                    (int)(pixel & 0x00FF0000) >> 16);
       return color;
      }

调用方法Color clr = GetPixelcolor（50,50）;

Answer 3

首先，捕获屏幕。

Rectangle screenRegion = Screen.AllScreens[0].Bounds;
Bitmap screen = new Bitmap(screenRegion.Width, screenRegion.Height, PixelFormat.Format32bppArgb);

Graphics screenGraphics = Graphics.FromImage(screenBitmap);
screenGraphics.CopyFromScreen(screenRegion.Left, screenRegion.Top, 0, 0, screenRegion.Size);

然后，从位图中获取像素 。

Answer 4

您可以使用winapi GetPixel(...)