C# 实现鼠标穿透窗体

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 MouseThroughForm{ public partial class Frm_Main : Form { public Frm_Main() { InitializeComponent(); } private const uint WS_EX_LAYERED = 0x80000; private const int WS_EX_TRANSPARENT = 0x20; private const int GWL_EXSTYLE = (-20); private string Var_genre = "";//记录当前操作的类型 #region 在窗口结构中为指定的窗口设置信息 /// <summary> /// 在窗口结构中为指定的窗口设置信息 /// </summary> /// <param name="hwnd">欲为其取得信息的窗口的句柄</param> /// <param name="nIndex">欲取回的信息</param> /// <param name="dwNewLong">由nIndex指定的窗口信息的新值</param> /// <returns></returns> [DllImport("user32", EntryPoint = "SetWindowLong")] private static extern uint SetWindowLong(IntPtr hwnd, int nIndex, uint dwNewLong); #endregion #region 从指定窗口的结构中取得信息 /// <summary> /// 从指定窗口的结构中取得信息 /// </summary> /// <param name="hwnd">欲为其获取信息的窗口的句柄</param> /// <param name="nIndex">欲取回的信息</param> /// <returns></returns> [DllImport("user32", EntryPoint = "GetWindowLong")] private static extern uint GetWindowLong(IntPtr hwnd, int nIndex); #endregion #region 使窗口有鼠标穿透功能 /// <summary> /// 使窗口有鼠标穿透功能 /// </summary> private void CanPenetrate() { uint intExTemp = GetWindowLong(this.Handle, GWL_EXSTYLE); uint oldGWLEx = SetWindowLong(this.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED); } #endregion private void Frm_Main_Load(object sender, EventArgs e) { this.ShowInTaskbar = false;//窗体不出现在Windows任务栏中 CanPenetrate(); this.TopMost = true;//使窗体始终在其它窗体之上 } #region 设置颜色和透明度的状态 /// <summary> /// 设置颜色和透明度的状态 /// </summary> private void SetEstate(Form Frm, object sender) { Var_genre = ((ToolStripMenuItem)sender).Name; string Tem_Str = Var_genre; if (Var_genre.IndexOf('_') >= 0) { Var_genre = Tem_Str.Substring(0, Tem_Str.IndexOf('_')); } switch (Var_genre) { case "ToolColor": { Color Tem_Color=Color.Gainsboro; switch (Convert.ToInt32(((ToolStripMenuItem)sender).Tag.ToString())) { case 1: Tem_Color = Color.Gainsboro; break; case 2: Tem_Color = Color.DarkOrchid; break; case 3: Tem_Color = Color.RoyalBlue; break; case 4: Tem_Color = Color.Gold; break; case 5: Tem_Color = Color.LightGreen; break; } Frm.BackColor = Tem_Color; break; } case "ToolClarity": { double Tem_Double = 0.0; switch (Convert.ToInt32(((ToolStripMenuItem)sender).Tag.ToString())) { case 1: Tem_Double = 0.1; break; case 2: Tem_Double = 0.2; break; case 3: Tem_Double = 0.3; break; case 4: Tem_Double = 0.4; break; case 5: Tem_Double = 0.5; break; case 6: Tem_Double = 0.6; break; case 7: Tem_Double = 0.7; break; case 8: Tem_Double = 0.8; break; case 9: Tem_Double = 0.9; break; } Frm.Opacity = Tem_Double; break; } case "ToolAcquiescence": { Frm.BackColor = Color.Gainsboro; Frm.Opacity = 0.6; break; } case "ToolClose": { Close(); break; } } } #endregion private void ToolColor_Glass_Click(object sender, EventArgs e) { SetEstate(this, sender); } }}