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【
CSharp
】
提取鼠标所指的像素
作者:
/ 发布于
2014/11/3
/
639
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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