利用NativeWindow监视WndProc消息

约定不等于承诺〃 2022-05-22 13:34 183阅读 0赞

[http://blog.csdn.net/lovefootball/article/details/1784882][http_blog.csdn.net_lovefootball_article_details_1784882]

在写Windows应用程序的时候，经常会碰到需要修改例如MessageBox或者FileDialog的外观  
此时我们需要监视 WndProc的消息  
当然也可以直接调用API实现，具体方法请参考  
[http://www.codeproject.com/csharp/GetSaveFileName.asp?df=100&forumid=96342&exp=0&select=1950454][http_www.codeproject.com_csharp_GetSaveFileName.asp_df_100_forumid_96342_exp_0_select_1950454]  
主要代码如下

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1.  using System;
2.  using System.Runtime.InteropServices;
3.  using System.Windows.Forms;
4.  using System.Collections.Generic;
5.  
6.  namespace testApplication1
7.  \{
8.  public delegate void HookWndProcHandler(ref Message m);
9.  
10. public class HookWndProc
11. \{
12. private Dictionary<Control, NativeWindow> nativeWindows = new Dictionary<Control, NativeWindow>();
13. 
14. public event HookWndProcHandler WndProcEvent;
15. 
16. public void BeginHookProc(Control control)
17. \{
18. if(nativeWindows.ContainsKey(control))
19. \{
20. return;
21. \}
22. 
23. nativeWindows.Add(control,  new HookNativeWindow(this, control));
24. \}
25. 
26. public void EndHookProc(Control control)
27. \{
28. if(!nativeWindows.ContainsKey(control))
29. \{
30. return;
31. \}
32. 
33. NativeWindow window = nativeWindows\[control\];
34. nativeWindows.Remove(control);
35. window.ReleaseHandle();
36. window = null;
37. \}
38. 
39. protected virtual void WndProc(ref Message m)
40. \{
41. FireWndProcEvent(ref m);
42. \}
43. 
44. protected void FireWndProcEvent(ref Message m)
45. \{
46. if (WndProcEvent != null)
47. \{
48. WndProcEvent(ref m);
49. \}
50. \}
51. 
52.  \#region NativeWindow
53. 
54. protected class HookNativeWindow : NativeWindow
55. \{
56. private HookWndProc hookWndProc;
57. 
58. public HookNativeWindow(HookWndProc hookWndProc, Control control)
59. \{
60. this.hookWndProc = hookWndProc;
61. 
62. if (control.IsHandleCreated)
63. \{
64. AssignHandle(control.Handle);
65. \}
66. else
67. \{
68. control.HandleCreated += new EventHandler(OnControlHandleCreated);
69. \}
70. 
71. control.HandleDestroyed +=  new EventHandler(OnControlHandleDestroyed);
72. \}
73. 
74. private void OnControlHandleCreated(object sender, EventArgs e)
75. \{
76. AssignHandle(((Control)sender).Handle);
77. \}
78. 
79. private void OnControlHandleDestroyed(object sender, EventArgs e)
80. \{
81. ReleaseHandle();
82. \}
83. 
84. \[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")\]
85. protected override void WndProc(ref Message m)
86. \{
87. hookWndProc.WndProc(ref m);
88. base.WndProc(ref m);
89. \}
90. \}
91. 
92.  \#endregion
93. \}
94. \}

using System; using System.Runtime.InteropServices; using System.Windows.Forms; using System.Collections.Generic; namespace testApplication1 \{ public delegate void HookWndProcHandler(ref Message m); public class HookWndProc \{ private Dictionary<Control, NativeWindow> nativeWindows = new Dictionary<Control, NativeWindow>(); public event HookWndProcHandler WndProcEvent; public void BeginHookProc(Control control) \{ if(nativeWindows.ContainsKey(control)) \{ return; \} nativeWindows.Add(control, new HookNativeWindow(this, control)); \} public void EndHookProc(Control control) \{ if(!nativeWindows.ContainsKey(control)) \{ return; \} NativeWindow window = nativeWindows\[control\]; nativeWindows.Remove(control); window.ReleaseHandle(); window = null; \} protected virtual void WndProc(ref Message m) \{ FireWndProcEvent(ref m); \} protected void FireWndProcEvent(ref Message m) \{ if (WndProcEvent != null) \{ WndProcEvent(ref m); \} \} \#region NativeWindow protected class HookNativeWindow : NativeWindow \{ private HookWndProc hookWndProc; public HookNativeWindow(HookWndProc hookWndProc, Control control) \{ this.hookWndProc = hookWndProc; if (control.IsHandleCreated) \{ AssignHandle(control.Handle); \} else \{ control.HandleCreated += new EventHandler(OnControlHandleCreated); \} control.HandleDestroyed += new EventHandler(OnControlHandleDestroyed); \} private void OnControlHandleCreated(object sender, EventArgs e) \{ AssignHandle(((Control)sender).Handle); \} private void OnControlHandleDestroyed(object sender, EventArgs e) \{ ReleaseHandle(); \} \[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")\] protected override void WndProc(ref Message m) \{ hookWndProc.WndProc(ref m); base.WndProc(ref m); \} \} \#endregion \} \}  
  
调用方法，以更改MessageBox的OK按钮文本为例

![None.gif][]   
![None.gif][] HookWndProc hookWndProc  =  new  HookWndProc();  
![None.gif][] hookWndProc.WndProcEvent  \+=  new  HookWndProcHandler(hookWndProc\_WndProcEvent);  
![None.gif][] hookWndProc.BeginHookProc( this );  
![None.gif][] MessageBox.Show( " MSG APP " ,  " MessageBoxCaption " , MessageBoxButtons.OKCancel);  
![None.gif][] hookWndProc.EndHookProc( this );  
![None.gif][]  
![None.gif][] private  void  hookWndProc\_WndProcEvent( ref  Message m)  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ... \{  
![InBlock.gif][] IntPtr wnd = FindWindow(null, "MessageBoxCaption");  
![InBlock.gif][]  
![InBlock.gif][]if (wnd  != IntPtr.Zero)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][] SetDlgItemText(wnd, 1, "需要修改的文本");  
![ExpandedSubBlockEnd.gif][] \}  
![ExpandedBlockEnd.gif][] \}   
![None.gif][] \[DllImport( " user32.dll " , EntryPoint  =  " FindWindow " , CharSet  =  CharSet.Auto)\]  
![None.gif][] private  extern  static  IntPtr FindWindow( string  lpClassName,  string  lpWindowName);  
![None.gif][]  
![None.gif][] \[DllImport( " user32.dll " )\]  
![None.gif][] public  static  extern  IntPtr SetDlgItemText(IntPtr hwnd,  int  id,  string  caption);

也就是说在WndProcEvent事件里面你可以写上你所需要做的事情  
  
如果需要修改FileDialog的外观  
则需要在WndProcEvent事件里面写上如下代码

![None.gif][] if  (m.Msg  ==  WM\_ENTERIDLE)  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ... \{  
![InBlock.gif][]uint dialogHandle = (uint)m.LParam;  
![InBlock.gif][]uint listviewHandle = FindWindowEx(dialogHandle, 0, "SHELLDLL\_DefView", "");  
![InBlock.gif][]if (listviewHandle !=0&& listviewHandle != lastListViewHandle)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][] SendMessage(listviewHandle, WM\_COMMAND, (uint)View, 0);  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]lastListViewHandle = listviewHandle;  
![InBlock.gif][]  
![InBlock.gif][]  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]/\*\*////<summary>  
![InBlock.gif][]/// FileListViewType  
![ExpandedSubBlockEnd.gif][]///</summary>  
![InBlock.gif][]public enum FileListView  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][] Icons =0x7029,  
![InBlock.gif][] SmallIcons =0x702a,  
![InBlock.gif][] List =0x702b,  
![InBlock.gif][] Details =0x702c,  
![InBlock.gif][] Thumbnails =0x7031,  
![InBlock.gif][] XpThumbnails =0x702d  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][]  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]/\*\*////<summary>  
![InBlock.gif][]/// win message : command  
![ExpandedSubBlockEnd.gif][]///</summary>  
![InBlock.gif][]private constuint WM\_COMMAND =0x0111;  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]/\*\*////<summary>  
![InBlock.gif][]/// win message : enter idle  
![ExpandedSubBlockEnd.gif][]///</summary>  
![InBlock.gif][]private constuint WM\_ENTERIDLE =0x0121;  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]/\*\*////<summary>  
![InBlock.gif][]/// listview type  
![ExpandedSubBlockEnd.gif][]///</summary>  
![InBlock.gif][]private FileListView view = FileListView.Thumbnails;  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]/\*\*////<summary>  
![InBlock.gif][]/// dialog handle  
![ExpandedSubBlockEnd.gif][]///</summary>  
![InBlock.gif][]private uint lastListViewHandle =0;  
![InBlock.gif][]  
![ContractedSubBlock.gif][]![ExpandedSubBlockStart.gif][]DllImports  
\#region DllImports  
![InBlock.gif][]  
![InBlock.gif][] \[DllImport("user32.dll", EntryPoint="SendMessageA", CallingConvention=CallingConvention.StdCall,CharSet=CharSet.Ansi)\]  
![InBlock.gif][]private staticexternuint SendMessage(uint Hdc, uint Msg\_Const, uint wParam,  uint lParam);  
![InBlock.gif][]  
![InBlock.gif][] \[DllImport("user32.dll", EntryPoint="FindWindowExA", CallingConvention=CallingConvention.StdCall,CharSet=CharSet.Ansi)\]  
![InBlock.gif][]private staticexternuint FindWindowEx(uint hwndParent, uint hwndChildAfter, string lpszClass, string lpszWindow);  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]\#endregion

SetDlgItemText(wnd, 1, "需要修改的文本");  
  
private const int IDOK = 1;  
private const int IDCANCEL = 2;  
private const int IDABORT = 3;  
private const int IDRETRY = 4;  
private const int IDIGNORE = 5;  
private const int IDYES = 6;  
private const int IDNO = 7;

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[http_blog.csdn.net_lovefootball_article_details_1784882]: http://blog.csdn.net/lovefootball/article/details/1784882
[http_www.codeproject.com_csharp_GetSaveFileName.asp_df_100_forumid_96342_exp_0_select_1950454]: http://www.codeproject.com/csharp/GetSaveFileName.asp?df=100&forumid=96342&exp=0&select=1950454
[view plain]: http://blog.csdn.net/lovefootball/article/details/1784882#
[None.gif]: /images/20220522/0d7c3901e15a40d9a16e01a7bb5a90e0.png
[ExpandedBlockStart.gif]: http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedBlockStart.gif
[ContractedBlock.gif]: /images/20220522/13ebb9209bed42b688817ca4080dff2c.png
[InBlock.gif]: /images/20220522/11723e76ba144750bc73723d2ab360b3.png
[ExpandedSubBlockStart.gif]: /images/20220522/7e8f9e8ab0874d5086e872df140579bb.png
[ContractedSubBlock.gif]: /images/20220522/8221f9e9a9ce42248821e6c9a2abdf45.png
[ExpandedSubBlockEnd.gif]: /images/20220522/b07e6b5e32a24a49acf6dced2d429018.png
[ExpandedBlockEnd.gif]: /images/20220522/bd25a7fcbfe4488fba005cd1e7546bab.png