确定 winforms 应用程序中像素的颜色 [英] Determine color of a pixel in a winforms application

问题描述

我希望能够在屏幕上的某个点确定 winform 的背景颜色，以便我可以根据该特定颜色采取一些行动.遗憾的是，System.Drawing 库似乎没有指定一种方法让我能够这样做.

I'd like to be able to determine the backgroundcolor of a winform at a certain point on the screen, so I can take some action depending on that particular color. Sadly the System.Drawing library doesn't seem to specify a method that enables me to do so.

然后我应该如何确定某个点的颜色?

How should I then determine the color at a certain point?

推荐答案

使用那个:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Drawing;

namespace ColorUnderCursor
{
    class CursorColor
    {
        [DllImport("gdi32")]
        public static extern uint GetPixel(IntPtr hDC, int XPos, int YPos);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern bool GetCursorPos(out POINT pt);

        [DllImport("User32.dll", CharSet = CharSet.Auto)]
        public static extern IntPtr GetWindowDC(IntPtr hWnd);

        /// <summary> 
        /// Gets the System.Drawing.Color from under the mouse cursor. 
        /// </summary> 
        /// <returns>The color value.</returns> 
        public static Color Get()
        {
            IntPtr dc = GetWindowDC(IntPtr.Zero);

            POINT p;
            GetCursorPos(out p);

            long color = GetPixel(dc, p.X, p.Y);
            Color cc = Color.FromArgb((int)color);
            return Color.FromArgb(cc.B, cc.G, cc.R);
        }
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct POINT
    {
        public int X;
        public int Y;
        public POINT(int x, int y)
        {
            X = x;
            Y = y;
        } 
    }
}

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