提取鼠标所指的像素代码,CSharp代码库,德仔网

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【CSharp】提取鼠标所指的像素
作者: / 发布于2014/11/3/ 759

	using System;
	using System.Runtime.InteropServices;
	using System.Windows.Forms;
	using System.Drawing;

	namespace Desktop
	{
	 public class Win32APICall
	 {
	 [DllImport("gdi32.dll", EntryPoint = "DeleteDC")]
	 public static extern IntPtr DeleteDC(IntPtr hdc);

	 [DllImport("gdi32.dll", EntryPoint = "DeleteObject")]
	 public static extern IntPtr DeleteObject(IntPtr hObject);

	 [DllImport("gdi32.dll", EntryPoint = "BitBlt")]
	 public static extern bool BitBlt(IntPtr hdcDest, int nXDest,
	 int nYDest, int nWidth, int nHeight, IntPtr hdcSrc,
	 int nXSrc, int nYSrc, int dwRop);

	 [DllImport("gdi32.dll", EntryPoint = "CreateCompatibleBitmap")]
	 public static extern IntPtr CreateCompatibleBitmap(IntPtr hdc,
	 int nWidth, int nHeight);

	 [DllImport("gdi32.dll", EntryPoint = "CreateCompatibleDC")]
	 public static extern IntPtr CreateCompatibleDC(IntPtr hdc);

	 [DllImport("gdi32.dll", EntryPoint = "SelectObject")]
	 public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobjBmp);

	 [DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
	 public static extern IntPtr GetDesktopWindow();

	 [DllImport("user32.dll", EntryPoint = "GetDC")]
	 public static extern IntPtr GetDC(IntPtr hWnd);

	 [DllImport("user32.dll", EntryPoint = "GetSystemMetrics")]
	 public static extern int GetSystemMetrics(int nIndex);

	 [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
	 public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);

	 public static Bitmap GetDesktop()
	 {
	 int screenX;
	 int screenY;
	 IntPtr hBmp;
	 IntPtr hdcScreen = GetDC(GetDesktopWindow());
	 IntPtr hdcCompatible = CreateCompatibleDC(hdcScreen);

	 screenX = GetSystemMetrics(0);
	 screenY = GetSystemMetrics(1);
	 hBmp = CreateCompatibleBitmap(hdcScreen, screenX, screenY);

	 if (hBmp != IntPtr.Zero)
	 {
	 IntPtr hOldBmp = (IntPtr)SelectObject(hdcCompatible, hBmp);
	 BitBlt(hdcCompatible, 0, 0, screenX, screenY, hdcScreen, 0, 0, 13369376);

	 SelectObject(hdcCompatible, hOldBmp);
	 DeleteDC(hdcCompatible);
	 ReleaseDC(GetDesktopWindow(), hdcScreen);
	 Bitmap bmp = System.Drawing.Image.FromHbitmap(hBmp);
	 DeleteObject(hBmp);
	 GC.Collect();
	 return bmp;
	 }

	 return null;
	 }
	 }
	}

	调用

	 private Bitmap myBitmap;
	 private void Form1_MouseMove(object sender, MouseEventArgs e)
	 {
	 myBitmap = Win32APICall.GetDesktop();
	 Color myColor = myBitmap.GetPixel(MousePosition.X, MousePosition.Y);
	 // label1.BackColor = myColor.R.ToString();
	 // label1.Text = myColor.R.ToString();
	 label1.BackColor = myColor;
	 }
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