实践过程
效果
代码
public partial class Form1 : Form { public Form1() { 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)); } }
partial class Form1 { ////// 必需的设计器变量。 /// private System.ComponentModel.IContainer components = null; ////// 清理所有正在使用的资源。 /// /// 如果应释放托管资源,为 true;否则为 false。 protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Windows 窗体设计器生成的代码 ////// 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。 /// private void InitializeComponent() { this.components = new System.ComponentModel.Container(); this.timer1 = new System.Windows.Forms.Timer(this.components); this.label2 = new System.Windows.Forms.Label(); this.lblmPos = new System.Windows.Forms.Label(); this.label3 = new System.Windows.Forms.Label(); this.label4 = new System.Windows.Forms.Label(); this.lblRGB = new System.Windows.Forms.Label(); this.pictureBox1 = new System.Windows.Forms.PictureBox(); ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit(); this.SuspendLayout(); // // timer1 // this.timer1.Enabled = true; this.timer1.Tick += new System.EventHandler(this.timer1_Tick); // // label2 // this.label2.AutoSize = true; this.label2.BackColor = System.Drawing.Color.Transparent; this.label2.ForeColor = System.Drawing.Color.Black; this.label2.Location = new System.Drawing.Point(12, 122); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(65, 12); this.label2.TabIndex = 2; this.label2.Text = "鼠标位置:"; // // lblmPos // this.lblmPos.AutoSize = true; this.lblmPos.BackColor = System.Drawing.Color.Transparent; this.lblmPos.ForeColor = System.Drawing.Color.Black; this.lblmPos.Location = new System.Drawing.Point(83, 122); this.lblmPos.Name = "lblmPos"; this.lblmPos.Size = new System.Drawing.Size(41, 12); this.lblmPos.TabIndex = 3; this.lblmPos.Text = "label3"; // // label3 // this.label3.AutoSize = true; this.label3.BackColor = System.Drawing.Color.Transparent; this.label3.ForeColor = System.Drawing.Color.Black; this.label3.Location = new System.Drawing.Point(10, 47); this.label3.Name = "label3"; this.label3.Size = new System.Drawing.Size(125, 12); this.label3.TabIndex = 5; this.label3.Text = "⊙ 当前像素的RGB值:"; // // label4 // this.label4.AutoSize = true; this.label4.BackColor = System.Drawing.Color.Transparent; this.label4.ForeColor = System.Drawing.Color.Black; this.label4.Location = new System.Drawing.Point(10, 73); this.label4.Name = "label4"; this.label4.Size = new System.Drawing.Size(125, 12); this.label4.TabIndex = 6; this.label4.Text = "⊙ 按ESC键关闭放大镜"; // // lblRGB // this.lblRGB.AutoSize = true; this.lblRGB.BackColor = System.Drawing.Color.Transparent; this.lblRGB.ForeColor = System.Drawing.Color.Black; this.lblRGB.Location = new System.Drawing.Point(129, 47); this.lblRGB.Name = "lblRGB"; this.lblRGB.Size = new System.Drawing.Size(41, 12); this.lblRGB.TabIndex = 7; this.lblRGB.Text = "label5"; // // pictureBox1 // this.pictureBox1.BackColor = System.Drawing.Color.White; this.pictureBox1.Location = new System.Drawing.Point(3, 146); this.pictureBox1.Name = "pictureBox1"; this.pictureBox1.Size = new System.Drawing.Size(234, 134); this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom; this.pictureBox1.TabIndex = 8; this.pictureBox1.TabStop = false; this.pictureBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.pictureBox1_Paint); // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.BackgroundImage = global::ScreenBlowupGlass.Properties.Resources.bg; this.ClientSize = new System.Drawing.Size(241, 284); this.Controls.Add(this.pictureBox1); this.Controls.Add(this.lblRGB); this.Controls.Add(this.label4); this.Controls.Add(this.label3); this.Controls.Add(this.lblmPos); this.Controls.Add(this.label2); this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; this.MaximizeBox = false; this.MinimizeBox = false; this.Name = "Form1"; this.Text = "屏幕放大镜"; this.Load += new System.EventHandler(this.Form1_Load); this.FormClosed += new System.Windows.Forms.FormClosedEventHandler(this.Form1_FormClosed); ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit(); this.ResumeLayout(false); this.PerformLayout(); } #endregion private System.Windows.Forms.Timer timer1; private System.Windows.Forms.Label label2; private System.Windows.Forms.Label lblmPos; private System.Windows.Forms.Label label3; private System.Windows.Forms.Label label4; private System.Windows.Forms.Label lblRGB; private System.Windows.Forms.PictureBox pictureBox1; }
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