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
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
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
/// <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.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;
}
