using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;namespace ScreenBlowupGlass{ public partial class Frm_Main : Form { public Frm_Main() { InitializeComponent(); } #region 定义快捷键 //如果函数执行成功，返回值不为0。 //如果函数执行失败，返回值为0。要得到扩展错误信息，调用GetLastError。 [DllImport("user32.dll", SetLastError = true)] public static extern bool RegisterHotKey( IntPtr hWnd, //要定义热键的窗口的句柄 int id, //定义热键ID（不能与其它ID重复） KeyModifiers fsModifiers, //标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效 Keys vk //定义热键的内容 ); [DllImport("user32.dll", SetLastError = true)] public static extern bool UnregisterHotKey( IntPtr hWnd, //要取消热键的窗口的句柄 int id //要取消热键的ID ); //定义了辅助键的名称（将数字转变为字符以便于记忆，也可去除此枚举而直接使用数值） [Flags()] public enum KeyModifiers { None = 0, Alt = 1, Ctrl = 2, Shift = 4, WindowsKey = 8 } #endregion #region 获取鼠标像素的RGB [DllImport("gdi32.dll")] static public extern uint GetPixel(IntPtr hDC, int XPos, int YPos); [DllImport("gdi32.dll")] static public extern IntPtr CreateDC(string driverName, string deviceName, string output, IntPtr lpinitData); [DllImport("gdi32.dll")] static public extern bool DeleteDC(IntPtr DC); static public byte GetRValue(uint color) { return (byte)color; } static public byte GetGValue(uint color) { return ((byte)(((short)(color)) >> 8)); } static public byte GetBValue(uint color) { return ((byte)((color) >> 16)); } static public byte GetAValue(uint color) { return ((byte)((color) >> 24)); } public Color GetColor(Point screenPoint) { IntPtr displayDC = CreateDC("DISPLAY", null, null, IntPtr.Zero); uint colorref = GetPixel(displayDC, screenPoint.X, screenPoint.Y); DeleteDC(displayDC); byte Red = GetRValue(colorref); byte Green = GetGValue(colorref); byte Blue = GetBValue(colorref); return Color.FromArgb(Red, Green, Blue); } #endregion int screenWidth; //屏幕宽度 int screenHeight; //屏幕高度 int mx; //鼠标x坐标 int my; //鼠标y坐标 const int imgWidth = 234;//放大后图片的宽度 const int imgHeight = 134;//放大后图片的高度 private void Form1_Load(object sender, EventArgs e) { this.Location = new Point(0,0); screenWidth = Screen.PrimaryScreen.WorkingArea.Width; screenHeight = Screen.PrimaryScreen.WorkingArea.Height; this.TopMost = true; } private void timer1_Tick(object sender, EventArgs e) { RegisterHotKey(Handle, 81, KeyModifiers.None, Keys.Escape); mx = Control.MousePosition.X; my = Control.MousePosition.Y; lblmPos.Text="(" mx.ToString() "," my.ToString() ")"; Point pt = new Point(mx,my); Color cl = GetColor(pt); lblRGB.Text = "(" cl.R.ToString() "," cl.G.ToString() "," cl.B ")"; if (mx <= this.Width&&my<=this.Height) { this.Location = new Point(screenWidth-this.Width,0); } if (mx >= screenWidth - this.Width&&my<=this.Height) { this.Location = new Point(0,0); } Bitmap bt = new Bitmap(imgWidth/2,imgHeight/2); Graphics g = Graphics.FromImage(bt); g.CopyFromScreen(new Point(Cursor.Position.X-imgWidth/4,Cursor.Position.Y-imgHeight/4),new Point(0,0),new Size(imgWidth/2,imgHeight/2)); IntPtr dc1 = g.GetHdc(); g.ReleaseHdc(dc1); pictureBox1.Image = (Image)bt; } protected override void WndProc(ref Message m) { const int WM_HOTKEY = 0x0312; //按快捷键 switch (m.Msg) { case WM_HOTKEY: switch (m.WParam.ToInt32()) { case 81: //按下的是ESC Application.Exit(); break; } break; } base.WndProc(ref m); } private void Form1_FormClosed(object sender, FormClosedEventArgs e) { //注销Id号为81的热键设定 UnregisterHotKey(Handle, 81); } private void pictureBox1_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; g.DrawLine(new Pen(Color.Red), new PointF(pictureBox1.Width / 2, 0), new PointF(pictureBox1.Width / 2,pictureBox1.Height)); g.DrawLine(new Pen(Color.Red,2), new PointF(0, pictureBox1.Height / 2), new PointF(pictureBox1.Width, pictureBox1.Height/2)); } }}
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