动态获取当前屏幕中光标所在位置的颜色

//////////////////////////////////////////////////////////////////////////

/// 程序:屏幕取色

/// 功能:动态获取当前屏幕中光标所在位置的颜色

/// 作者:黎波

/// 网名:upto(阿球)

/// 邮箱:itfun@163.com

/// 日期:2004331

//////////////////////////////////////////////////////////////////////////

 
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
 
namespace LiBo.ColorPicker
{
    /// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        // 桌面工作区的尺寸
        Size workingArea;
        // Form 的初始位置和在左下角,右下角的位置
        Point formLoc, ptLeftBottom, ptRightBottom;
 
        private System.Windows.Forms.Label lblColor;
        private System.Windows.Forms.TextBox txtArgb;
        private System.Windows.Forms.Timer tmr;
        private System.Windows.Forms.ToolTip tip;
        private System.ComponentModel.IContainer components;
 
        public Form1()
        {
            InitializeComponent();
 
            this.FormBorderStyle = FormBorderStyle.FixedToolWindow;
            this.StartPosition = FormStartPosition.CenterScreen;
 
            Rectangle rect  = SystemInformation.WorkingArea;
            workingArea     = new Size(rect.Width, rect.Height);
            ptLeftBottom    = new Point(0, workingArea.Height - this.Height);
            ptRightBottom   = new Point(workingArea.Width - this.Width,
                                        workingArea.Height - this.Height);
 
            String tipMsg = "在窗体空白处双击鼠标左键开始取色,按ESC键确定颜色";
            tip.SetToolTip(this, tipMsg);
            tip.SetToolTip(lblColor, tipMsg);
            tip.SetToolTip(txtArgb, tipMsg);
        }
 
        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
 
        #region Windows Form Designer generated code
        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.lblColor = new System.Windows.Forms.Label();
            this.tmr = new System.Windows.Forms.Timer(this.components);
            this.txtArgb = new System.Windows.Forms.TextBox();
            this.tip = new System.Windows.Forms.ToolTip(this.components);
            this.SuspendLayout();
            //
            // lblColor
            //
            this.lblColor.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.lblColor.Location = new System.Drawing.Point(8, 8);
            this.lblColor.Name = "lblColor";
            this.lblColor.TabIndex = 0;
            //
            // tmr
            //
            this.tmr.Tick += new System.EventHandler(this.tmr_Tick);
            //
            // txtArgb
            //
            this.txtArgb.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.txtArgb.Font = new System.Drawing.Font("Arial", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
            this.txtArgb.Location = new System.Drawing.Point(8, 40);
            this.txtArgb.Name = "txtArgb";
            this.txtArgb.TabIndex = 1;
            this.txtArgb.Text = "";
            this.txtArgb.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txtArgb_KeyPress);
            //
            // Form1
            //
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(115, 70);
            this.Controls.Add(this.txtArgb);
            this.Controls.Add(this.lblColor);
            this.Name = "Form1";
            this.Text = "屏幕取色(upto)";
            this.DoubleClick += new System.EventHandler(this.Form1_DoubleClick);
            this.MouseEnter += new System.EventHandler(this.Form1_MouseEnter);
            this.ResumeLayout(false);
 
        }
        #endregion
 
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }
 
        [ DllImport ( "gdi32.dll" ) ]
        private static extern bool BitBlt (
            IntPtr hdcDest, // 目标设备的句柄
            int nXDest, // 目标对象的左上角的X坐标
            int nYDest, // 目标对象的左上角的X坐标
            int nWidth, // 目标对象的矩形的宽度
            int nHeight, // 目标对象的矩形的长度
            IntPtr hdcSrc, // 源设备的句柄
            int nXSrc, // 源对象的左上角的X坐标
            int nYSrc, // 源对象的左上角的X坐标
            int dwRop // 光栅的操作值
        );
 
        [ DllImport ( "gdi32.dll" ) ]
        private static extern IntPtr CreateDC (
            string lpszDriver, // 驱动名称
            string lpszDevice, // 设备名称
            string lpszOutput, // 无用,可以设定位"NULL"
            IntPtr lpInitData // 任意的打印机数据
        );
 
        private void Form1_DoubleClick(object sender, EventArgs e)
        {
            formLoc         = this.Location;
            this.Location   = ptRightBottom;
            this.TopMost    = true;
            tmr.Enabled     = true;
        }
 

    private void tmr_Tick(object sender, EventArgs e)

    {

        // 创建显示器的DC

        IntPtr hdlDisplay = CreateDC("DISPLAY", null, null, IntPtr.Zero);

        // 从指定设备的句柄创建新的 Graphics 对象

        Graphics gfxDisplay = Graphics.FromHdc(hdlDisplay);

        // 创建只有一个象素大小的 Bitmap 对象

        Bitmap bmp = new Bitmap(1, 1, gfxDisplay);

        // 从指定 Image 对象创建新的 Graphics 对象

        Graphics gfxBmp = Graphics.FromImage(bmp);

        // 获得屏幕的句柄

        IntPtr hdlScreen = gfxDisplay.GetHdc();

        // 获得位图的句柄

        IntPtr hdlBmp = gfxBmp.GetHdc();

        // 把当前屏幕中鼠标指针所在位置的一个象素拷贝到位图中

        BitBlt(hdlBmp, 0, 0, 1, 1, hdlScreen, MousePosition.X, MousePosition.Y, 13369376);

        // 释放屏幕句柄

        gfxDisplay.ReleaseHdc(hdlScreen);

        // 释放位图句柄

        gfxBmp.ReleaseHdc(hdlBmp);

        lblColor.BackColor = bmp.GetPixel(0, 0); // 获取像素的颜色

        txtArgb.Text = "0x" + lblColor.BackColor.ToArgb().ToString("x").ToUpper();

        gfxDisplay.Dispose();
        gfxBmp.Dispose();

        bmp.Dispose(); // 释放 bmp 所使用的资源

    }

 

        private void txtArgb_KeyPress(object sender, KeyPressEventArgs e)
        {
            // 当按下ESC键时,确定所取的颜色ARGB值
            // 注意:只有当窗体处于激活状态时才有效
            if (e.KeyChar == (char)Keys.Escape)
            {
                tmr.Enabled = false;
                this.Location = formLoc;
                this.TopMost = false;
                txtArgb.SelectAll();
            }
        }
 
        private void Form1_MouseEnter(object sender, EventArgs e)
        {
            if (this.Location == ptLeftBottom) //窗体在左下角
            {
                this.Location = ptRightBottom;
            }
            else if (this.Location == ptRightBottom) // 窗体在右下角
            {
                this.Location = ptLeftBottom;
            }
        }
    }
}
posted @ 2004-04-07 22:37  黎波  阅读(1316)  评论(0编辑  收藏  举报