捕获键盘和鼠标的消息机制

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. namespace 消息机制获取
10. {
11. public partial class Form1 : Form
12. {
13. public Form1()
14. {
15. InitializeComponent();
16. }
17. private void Form1_Load(object sender, EventArgs e)
18. {
20. }
22. //int t;
23. //internal class MyMessager : IMessageFilter
24. //{
25. // public bool PreFilterMessage(ref Message m)
26. // {
27. // //如果检测到有鼠标或则键盘的消息，则使计数为0.....
28. // if (m.Msg == 0x0200 || m.Msg == 0x0201 || m.Msg == 0x0204 || m.Msg == 0x0207)
29. // {
30. // }
31. // return false;
32. // }
34. //}

1. // Constant value was found in the "windows.h" header file.
2. private const int WM_ACTIVATEAPP = 0x001C;
3. private bool appActive = true;
5. String strMsg;
6. [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
7. protected override void WndProc(ref Message m)
8. {
10. strMsg = string.Format("Message：Msg_{0} HWnd_{1} LParam_{2} Result_{3} WParam_{4}", m.Msg, m.HWnd, m.LParam, m.Result, m.WParam);
13. // Listen for operating system messages.
14. switch (m.Msg)
15. {
16. // The WM_ACTIVATEAPP message occurs when the application
17. // becomes the active application or becomes inactive.
18. case WM_ACTIVATEAPP:
19. // The WParam value identifies what is occurring.
20. appActive = (((int)m.WParam != 0));
21. // Invalidate to get new text painted.
22. this.Invalidate();
23. break;
24. }
25. base.WndProc(ref m);
26. }
28. //或重写ProcessCmdKey的方法
29. protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData)
30. {
31. int WM_KEYDOWN = 256;
32. int WM_SYSKEYDOWN = 260;
34. label1.Text = string.Format("Message:{0} keys:{1}",msg.Msg,keyData.ToString());
36. if (msg.Msg == WM_KEYDOWN | msg.Msg == WM_SYSKEYDOWN)
37. {
38. switch (keyData)
39. {
40. case Keys.Escape:
41. //this.Close();//esc关闭窗体
42. break;
43. }
44. }
45. return false;
46. }
47. private void timer1_Tick(object sender, EventArgs e)
48. {
49. this.Invoke((EventHandler)delegate
50. {
51. label2.Text = strMsg;
52. });
53. }

2. }
3. }