VC++实现内存共享（两个EXE通过内存共享传递信息通信）

我爱萨其马虞co

共享内存通信演示
vc6.0 c++
演示步骤：
1. 启动smserver
2. <创建共享内存>
3. 启动smclient
4. 在smserver中，输入要写入的内容，然后点击“写入数据”
5. 在smclient可以看到smserver中写入的数据
smserver端可以反复写入数据，则在smclient端会可见随着改变
此演示非常简单，只是演示如何使用，没有考虑性能、方式等，如果需要拿到真正的代码中使用，则需要考虑其它额外的工作，比如方式、效率等

创建内存

1. void CSmserverDlg::OnBtnopensm()
   
2. {
   
3. // TODO: Add your control notification handler code here
   
4. if ( m_hShareMem == NULL )
   
5. {
   
6. SECURITY_ATTRIBUTES sa;
   
7. memset( &sa, 0, sizeof(sa) );
   
8. sa.nLength = sizeof(sa);
   
9. m_hShareMem = CreateFileMapping( (HANDLE)0xFFFFFFFF, &sa, PAGE_READWRITE, 0, m_dwSMLen, TEXT("rm_test_share_memory_trans_20100601") );
   
10. if ( m_hShareMem == NULL )
    
11. {
    
12. m_StStatus.SetWindowText( TEXT("创建共享内存失败！") );
    
13. }
    
14. else
    
15. {
    
16. m_lpVoidSM = MapViewOfFile( m_hShareMem, FILE_MAP_ALL_ACCESS, 0, 0, 0 );
    
17. if ( m_lpVoidSM == NULL )
    
18. {
    
19. CString strErr;
    
20. strErr.Format( TEXT("创建共享内存地址失败！error = %d"), GetLastError() );
    
21. m_StStatus.SetWindowText( strErr );
    
22. CloseHandle( m_hShareMem );
    
23. m_hShareMem = NULL;
    
24. }
    
25. else
    
26. {
    
27. m_StStatus.SetWindowText( TEXT("创建共享内存成功---") );
    
28. 
    
29. // 清空第一个字节
    
30. memcpy( m_lpVoidSM, TEXT("\0"), 1 );
    
31. }
    
32. }
    
33. }
    
34. }
    
35. 
    
36. 
    
37. 
    
38. 写入数据
    
39. void CSmserverDlg::OnBtnwrite()
    
40. {
    
41. // TODO: Add your control notification handler code here
    
42. if ( m_lpVoidSM == NULL )
    
43. {
    
44. AfxMessageBox( TEXT("先创建共享内存!"), MB_ICONSTOP );
    
45. return;
    
46. }
    
47. 
    
48. CString strText;
    
49. m_EdWrite.GetWindowText( strText );
    
50. if ( strText.GetLength() == 0 )
    
51. {
    
52. AfxMessageBox( TEXT("必需输入要写入的内容!"), MB_ICONSTOP );
    
53. return;
    
54. }
    
55. 
    
56. strcpy( (char*)m_lpVoidSM, strText.GetBuffer(0) );
    
57. }
    
58. 
    
59. 
    
60. 
    
61. 另一个EXE-读取数据。。。如下
    
62. void CSmclientDlg::OnBtnopensm()
    
63. {
    
64. // TODO: Add your control notification handler code here
    
65. if ( m_hShareMem == NULL )
    
66. {
    
67. SECURITY_ATTRIBUTES sa;
    
68. memset( &sa, 0, sizeof(sa) );
    
69. sa.nLength = sizeof(sa);
    
70. m_hShareMem = CreateFileMapping( (HANDLE)0xFFFFFFFF, &sa, PAGE_READWRITE, 0, m_dwSMLen, TEXT("rm_test_share_memory_trans_20100601") );
    
71. if ( m_hShareMem == NULL )
    
72. {
    
73. AfxMessageBox( TEXT("打开共享内存失败！"), MB_ICONSTOP );
    
74. }
    
75. else
    
76. {
    
77. m_lpVoidSM = MapViewOfFile( m_hShareMem, FILE_MAP_ALL_ACCESS, 0, 0, 0 );
    
78. if ( m_lpVoidSM == NULL )
    
79. {
    
80. AfxMessageBox( TEXT("打开共享内存地址失败！"), MB_ICONSTOP );
    
81. CloseHandle( m_hShareMem );
    
82. m_hShareMem = NULL;
    
83. }
    
84. else
    
85. {
    
86. SetTimer( 1, 100, NULL );
    
87. m_BtnOpenSM.SetWindowText( TEXT("正在监视...") );
    
88. m_BtnOpenSM.EnableWindow( FALSE );
    
89. }
    
90. }
    
91. }
    
92. }
    
93. 
    
94. void CSmclientDlg::OnTimer(UINT nIDEvent)
    
95. {
    
96. // TODO: Add your message handler code here and/or call default
    
97. if ( strlen((char*)m_lpVoidSM) > 0 )
    
98. {
    
99. m_StRead.SetWindowText( (char*)m_lpVoidSM );
    
100. memcpy( m_lpVoidSM, TEXT("\0"), 1 );
     
101. }
     
102. 
     
103. CDialog::OnTimer(nIDEvent);
     
104. }

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