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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; } } } }  

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