利用NativeWindow监视WndProc消息（好像是一个字典，没搞明白）

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
主要代码如下

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

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

调用方法，以更改MessageBox的OK按钮文本为例

            HookWndProc hookWndProc = new HookWndProc();
            hookWndProc.WndProcEvent += new HookWndProcHandler(hookWndProc_WndProcEvent);
            hookWndProc.BeginHookProc(this);
            MessageBox.Show("MSG APP", "MessageBoxCaption", MessageBoxButtons.OKCancel);
            hookWndProc.EndHookProc(this);

private void hookWndProc_WndProcEvent(ref Message m)
        ...{
            IntPtr wnd = FindWindow(null, "MessageBoxCaption");

            if (wnd != IntPtr.Zero)
            ...{
                SetDlgItemText(wnd, 1, "需要修改的文本");
            }
        }
        [DllImport("user32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)]
        private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll")]
        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

if (m.Msg == WM_ENTERIDLE)
...{
    uint dialogHandle = (uint)m.LParam;
    uint listviewHandle = FindWindowEx(dialogHandle, 0, "SHELLDLL_DefView", "");
    if (listviewHandle != 0 && listviewHandle != lastListViewHandle)
    ...{
        SendMessage(listviewHandle, WM_COMMAND, (uint)View, 0);
}
lastListViewHandle = listviewHandle;



    /**//// <summary>
    /// FileListViewType
    /// </summary>
    public enum FileListView
    ...{
        Icons = 0x7029,
        SmallIcons = 0x702a,
        List = 0x702b,
        Details = 0x702c,
        Thumbnails = 0x7031,
        XpThumbnails = 0x702d
    }


        /**//// <summary>
        /// win message : command
        /// </summary>
        private const uint WM_COMMAND = 0x0111;

        /**//// <summary>
        /// win message : enter idle
        /// </summary>
        private const uint WM_ENTERIDLE = 0x0121;

        /**//// <summary>
        /// listview type
        /// </summary>
        private FileListView view = FileListView.Thumbnails;

        /**//// <summary>
        /// dialog handle
        /// </summary>
        private uint lastListViewHandle = 0;

DllImports
#region DllImports

        [DllImport("user32.dll", EntryPoint="SendMessageA", CallingConvention=CallingConvention.StdCall,CharSet=CharSet.Ansi)] 
        private static extern uint SendMessage(uint Hdc, uint Msg_Const, uint wParam, uint lParam);

        [DllImport("user32.dll", EntryPoint="FindWindowExA", CallingConvention=CallingConvention.StdCall,CharSet=CharSet.Ansi)] 
        private static extern uint FindWindowEx(uint hwndParent, uint hwndChildAfter, string lpszClass,string lpszWindow);

        #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;

欢迎转载，请注明出处~~

http://blog.csdn.net/jiangxinyu/article/details/8080409