学步园

     上篇文章界面开发概述，讲了我开发界面的一些心得体会和一些基本的原理，从这篇开始，我开始讲解一下我的界面开发的全部过程，一步一步的讲解开发界面的过程，这篇主要讲解的是Hook编程，Hook所有的窗体。

     Hook，对于大多数程序员来说，这个词并不陌生。对于Windows系统来说，消息Message的传递贯穿了整个系统，Message简单来说就是一个整数，它具有相应的意义。在C++的winuser.h中可以看到我们常用的很多的Message。Hook与Message是密不可分的，它的中文解释就是“钩子”，就是监控系统中Message的传递，就是在Message传递到最终的Message处理前，对特定的消息进行处理。

     对于Hook来说，开发主要的有3个API函数，均放在User32.dll文件中，这三个函数是：

 1         /// <summary>
 2         /// SetWindowsHookEx
 3         /// </summary>
 4         /// <param name="idHook"></param>
 5         /// <param name="lpfn"></param>
 6         /// <param name="hMod"></param>
 7         /// <param name="dwThreadId"></param>
 8         /// <returns></returns>
 9         [DllImport("User32.dll", CharSet = CharSet.Auto)]
10         public static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, int hMod, int dwThreadId);
11   
12         /// <summary>
13         /// CallNextHookEx
14         /// </summary>
15         /// <param name="hhk"></param>
16         /// <param name="nCode"></param>
17         /// <param name="wParam"></param>
18         /// <param name="lParam"></param>
19         /// <returns></returns>
20         [DllImport("User32.dll", CharSet = CharSet.Auto)]
21         public static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
22     
23         /// <summary>
24         /// UnhookWindowsHookEx
25         /// </summary>
26         /// <param name="hhk"></param>
27         /// <returns></returns>
28         [DllImport("User32.dll", CharSet = CharSet.Auto)]
29         public static extern bool UnhookWindowsHookEx(IntPtr hhk);

 

     这三个方法分别就是添加Hook，释放Hook和执行下一个Hook。其中的参数就不必介绍了，网上有很多这方面的资料。

     接下来就是对Windows窗体的消息截取。

     我创建一个项目名称叫做SkinEngines，然后再NativeMethod中添加了这三个方法。其中SetWindowsHookEx中需要一个参数就是一个方面的名称，在C#中使用委托实现，所以也创建了一个专门保存委托的地点，放在Delegates.cs文件中。

    /// <summary>
    /// HookProc -- HookProc
    /// </summary>
    /// <param name="nCode"></param>
    /// <param name="wParam"></param>
    /// <param name="lParam"></param>
    /// <returns></returns>
    public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);

 

     然后创建一个名为SkinEngine的Component。在SkinEngine的构造函数中添加了自己的一些操作，对窗体的Hook。代码如下：

  1 /// <summary>
  2     /// SkinEngine -- Skin All Form,Dialog,Control
  3     /// </summary>
  4     public partial class SkinEngine : Component
  5     {
  6         #region Field
  7         /// <summary>
  8         /// CBTHook -- Hook WH_CBT
  9         /// </summary>
 10         private static HookProc _cbtHook;
 11 
 12         /// <summary>
 13         /// Hook
 14         /// </summary>
 15         private static IntPtr Hook;
 16 
 17         /// <summary>
 18         /// Current SkinEngine
 19         /// </summary>
 20         internal static SkinEngine Engine;
 21 
 22         /// <summary>
 23         /// Skinned handled
 24         /// </summary>
 25         internal static ArrayList SkinHandleList = new ArrayList();
 26         #endregion
 27 
 28         #region Constructor
 29         /// <summary>
 30         /// Constructor
 31         /// </summary>
 32         public SkinEngine()
 33         {
 34             InitializeComponent();
 35             // Internal Constructor
 36             this.InternalConstructor();
 37         }
 38 
 39         /// <summary>
 40         /// Constructor With container
 41         /// </summary>
 42         /// <param name="container"></param>
 43         public SkinEngine(IContainer container)
 44         {
 45             container.Add(this);
 46 
 47             InitializeComponent();
 48 
 49             // Internal Constructor
 50             this.InternalConstructor();
 51         }
 52         #endregion
 53 
 54         #region InternalConstructor
 55         /// <summary>
 56         /// the Internal Constructor to Create Hook and Get List of all control to skin.
 57         /// </summary>
 58         private void InternalConstructor()
 59         {
 60             // IsDesignMode == false
 61             if (!IsDesignMode)
 62             {
 63                 // Check Engine
 64                 if (Engine == null)
 65                 {
 66                     // Set Engine
 67                     Engine = this;
 68 
 69                     // Hook Process
 70                     if (Hook == IntPtr.Zero)
 71                     {
 72                         _cbtHook = new HookProc(SkinEngine.FnHookProc);
 73                         Hook = NativeMethod.SetWindowsHookEx(5, _cbtHook, 0, AppDomain.GetCurrentThreadId());
 74                         Application.ApplicationExit += new EventHandler(Application_ApplicationExit);
 75                     }
 76                 }
 77             }
 78         }
 79         #endregion
 80 
 81         #region FnHookProc
 82         /// <summary>
 83         /// FnHookProc
 84         /// </summary>
 85         /// <param name="nCode"></param>
 86         /// <param name="wParam"></param>
 87         /// <param name="lParam"></param>
 88         /// <returns></returns>
 89         private static unsafe IntPtr FnHookProc(int nCode, IntPtr wParam, IntPtr lParam)
 90         {
 91             if (Engine != null)
 92             {
 93                 switch (nCode)
 94                 {
 95                     case 5:
 96                         // Get Skin Control
 97                         Control control = Control.FromHandle(wParam);
 98                         // Control is null it Can be Dialog
 99                         if (control == null)
100                         {
101                             StringBuilder builder = new StringBuilder(260);
102                             NativeMethod.GetClassName(wParam, builder, 260);
103                             // #32770 is Dialog
104                             if (builder.Length == 6 && builder.ToString() == "#32770")
105                             {
106                                 // Add to SkinHandleList
107                                 SkinHandleList.Add(wParam);
108                                 // Print
109                                 Debug.WriteLine(builder.ToString());
110                             }
111                             break;
112                         }
113                         if (!SkinHandleList.Contains(wParam) && (control is Form))
114                         {
115                             // Add to SkinHandleList
116                             SkinHandleList.Add(wParam);
117                             // Print all control's Name
118                             Debug.WriteLine(control.Name);
119                         }
120                         break;
121                     default:
122                         break;
123                 }
124             }
125             return NativeMethod.CallNextHookEx(Hook, nCode, wParam, lParam);
126         }
127         #endregion
128 
129         #region Application_ApplicationExit
130         /// <summary>
131         /// Application_ApplicationExit
132         /// </summary>
133         /// <param name="sender"></param>
134         /// <param name="e"></param>
135         private void Application_ApplicationExit(object sender, EventArgs e)
136         {
137             Engine.Dispose(false);
138         }
139         #endregion
140 
141         #region Property
142         /// <summary>
143         /// Gets or sets a value indicating whether we are currently in design mode.
144         /// </summary>
145         /// <value>
146         ///     <c>true</c> if this we are in design mode; otherwise, <c>false</c>.
147         /// </value>
148         internal static bool IsDesignMode { get; set; }
149         #endregion
150     }

 

      这样整个窗体就可以进行Hook，其中NativeMethod.SetWindowsHookEx设置了WM_CBT的消息，这个消息用来对Windows窗体的激活，显示。这样，窗体就会被我们记录下来，现在仅仅是将记录下来的窗体显示出来，写出了窗体的名称。结果如下：

     

      这篇就暂时写道这里，下一篇将对Form的消息进行Hook并绘制。

      代码：/Files/zhjp11/皮肤/SkinEngines20100318.rar