[C#] 픽셀서치 PixelSearch

화면상의 픽셀을 얻기 위해서 BitBlt로 (1,1) 크기의 픽셀을 먼저 얻어봅시다.

// ex )  GetColorAt(pos);

/* [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
        public static extern int BitBlt(IntPtr hDC, int x, int y, int nWidth, int nHeight, IntPtr hSrcDC, int xSrc, int ySrc, int dwRop);

추가하셔야 bitblt사용가능

*/

using System.Drawing;

       public Color GetColorAt(Point location)
        {
            Bitmap screenPixel = new Bitmap(1, 1, PixelFormat.Format32bppArgb);

            using (Graphics gdest = Graphics.FromImage(screenPixel))
            {
                using (Graphics gsrc = Graphics.FromHwnd(IntPtr.Zero))
                {
                    IntPtr hSrcDC = gsrc.GetHdc();
                    IntPtr hDC = gdest.GetHdc();
                    int retval = BitBlt(hDC, 0, 0, 1, 1, hSrcDC, location.X, location.Y, (int)CopyPixelOperation.SourceCopy);
                    gdest.ReleaseHdc();
                    gsrc.ReleaseHdc();
                }
            }
       
            return screenPixel.GetPixel(0, 0);
        }

한 픽셀의 색을 얻는것이 이제 가능해졌습니다.

픽셀서치는 단순히 구간을 정해 GetPixel을 여러번한거죠. 그러면 screenPixel의 크기를 늘리고 BitBlt 로 캡쳐할 구간을 늘리면 되겠네요.

using System.Drawing;

 

        public bool PixelSearch(int left,int top,int right,int bottom,Color data)
        {
            int width = right - left;
            int height = bottom - top;
            Bitmap screenBitmap = new Bitmap(width,height, PixelFormat.Format32bppArgb);

            using (Graphics gdest = Graphics.FromImage(screenBitmap))
            {
                using (Graphics gsrc = Graphics.FromHwnd(IntPtr.Zero))
                {
                    IntPtr hSrcDC = gsrc.GetHdc();
                    IntPtr hDC = gdest.GetHdc();
                    int retval = BitBlt(hDC, 0, 0, width, height, hSrcDC, left, top, (int)CopyPixelOperation.SourceCopy);
                    gdest.ReleaseHdc();
                    gsrc.ReleaseHdc();
                    for(int i = 0; i < height; i++)
                    {
                        for(int j=0; j< width; j++)
                        {
                            Color c = screenBitmap.GetPixel(0, 0);
                            if (c == data)
                                return true;
                        }
                    }
                }
            }
            return false;
        }