C#窗体设计------鼠标穿透窗体

技巧解析：主要用到了两个系统API函数 SetWindowLong和GetWindowLong

  1 using System;
  2 using System.Collections.Generic;
  3 using System.ComponentModel;
  4 using System.Data;
  5 using System.Drawing;
  6 using System.Linq;
  7 using System.Text;
  8 using System.Windows.Forms;
  9 using System.Runtime.InteropServices;
 10
 11 namespace MouseThroughForm
 12 {
 13     public partial class Frm_Main : Form
 14     {
 15         public Frm_Main()
 16         {
 17             InitializeComponent();
 18         }
 19
 20         private const uint WS_EX_LAYERED = 0x80000;
 21         private const int WS_EX_TRANSPARENT = 0x20;
 22         private const int GWL_EXSTYLE = (-20);
 23         private string Var_genre = "";//记录当前操作的类型
 24
 25         #region 在窗口结构中为指定的窗口设置信息
 26         /// <summary>
 27         /// 在窗口结构中为指定的窗口设置信息
 28         /// </summary>
 29         /// <param name="hwnd">欲为其取得信息的窗口的句柄</param>
 30         /// <param name="nIndex">欲取回的信息</param>
 31         /// <param name="dwNewLong">由nIndex指定的窗口信息的新值</param>
 32         /// <returns></returns>
 33         [DllImport("user32", EntryPoint = "SetWindowLong")]
 34         private static extern uint SetWindowLong(IntPtr hwnd, int nIndex, uint dwNewLong);
 35         #endregion
 36
 37         #region 从指定窗口的结构中取得信息
 38         /// <summary>
 39         /// 从指定窗口的结构中取得信息
 40         /// </summary>
 41         /// <param name="hwnd">欲为其获取信息的窗口的句柄</param>
 42         /// <param name="nIndex">欲取回的信息</param>
 43         /// <returns></returns>
 44         [DllImport("user32", EntryPoint = "GetWindowLong")]
 45         private static extern uint GetWindowLong(IntPtr hwnd, int nIndex);
 46         #endregion
 47
 48         #region 使窗口有鼠标穿透功能
 49         /// <summary>
 50         /// 使窗口有鼠标穿透功能
 51         /// </summary>
 52         private void CanPenetrate()
 53         {
 54             uint intExTemp = GetWindowLong(this.Handle, GWL_EXSTYLE);
 55             uint oldGWLEx = SetWindowLong(this.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED);
 56         }
 57         #endregion
 58
 59         private void Frm_Main_Load(object sender, EventArgs e)
 60         {
 61             this.ShowInTaskbar = false;//窗体不出现在Windows任务栏中
 62             CanPenetrate();
 63             this.TopMost = true;//使窗体始终在其它窗体之上
 64         }
 65
 66         #region 设置颜色和透明度的状态
 67         /// <summary>
 68         /// 设置颜色和透明度的状态
 69         /// </summary>
 70         private void SetEstate(Form Frm, object sender)
 71         {
 72             Var_genre = ((ToolStripMenuItem)sender).Name;
 73             string Tem_Str = Var_genre;
 74             if (Var_genre.IndexOf(‘_‘) >= 0)
 75             {
 76                 Var_genre = Tem_Str.Substring(0, Tem_Str.IndexOf(‘_‘));
 77             }
 78
 79             switch (Var_genre)
 80             {
 81                 case "ToolColor":
 82                     {
 83                         Color Tem_Color=Color.Gainsboro;
 84                         switch (Convert.ToInt32(((ToolStripMenuItem)sender).Tag.ToString()))
 85                         {
 86                             case 1: Tem_Color = Color.Gainsboro; break;
 87                             case 2: Tem_Color = Color.DarkOrchid; break;
 88                             case 3: Tem_Color = Color.RoyalBlue; break;
 89                             case 4: Tem_Color = Color.Gold; break;
 90                             case 5: Tem_Color = Color.LightGreen; break;
 91                         }
 92                         Frm.BackColor = Tem_Color;
 93                         break;
 94                     }
 95                 case "ToolClarity":
 96                     {
 97                         double Tem_Double = 0.0;
 98                         switch (Convert.ToInt32(((ToolStripMenuItem)sender).Tag.ToString()))
 99                         {
100                             case 1: Tem_Double = 0.1; break;
101                             case 2: Tem_Double = 0.2; break;
102                             case 3: Tem_Double = 0.3; break;
103                             case 4: Tem_Double = 0.4; break;
104                             case 5: Tem_Double = 0.5; break;
105                             case 6: Tem_Double = 0.6; break;
106                             case 7: Tem_Double = 0.7; break;
107                             case 8: Tem_Double = 0.8; break;
108                             case 9: Tem_Double = 0.9; break;
109
110                         }
111                         Frm.Opacity = Tem_Double;
112                         break;
113                     }
114                 case "ToolAcquiescence":
115                     {
116                         Frm.BackColor = Color.Gainsboro;
117                         Frm.Opacity = 0.6;
118                         break;
119                     }
120                 case "ToolClose":
121                     {
122                         Close();
123                         break;
124                     }
125
126             }
127         }
128         #endregion
129
130         private void ToolColor_Glass_Click(object sender, EventArgs e)
131         {
132             SetEstate(this, sender);
133         }
134     }
135 }