80.共享内存实现进程通信

服务器创建共享内存

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<Windows.h>
 4 
 5 #define  SIZE 4096
 6 //指针标识首地址
 7 LPVOID lpdata = NULL;
 8 
 9 
10 void main()
11 {
12     if (lpdata!=NULL)
13     {
14         puts("共享内存存在");
15     }
16     //创建共享内存
17     HANDLE hmap = CreateFileMappingA(INVALID_HANDLE_VALUE, NULL,
18         PAGE_READWRITE | SEC_COMMIT, 0, SIZE, "cgwmem");
19 
20     if (hmap==NULL)
21     {
22         puts("创建失败");
23     }
24     else
25     {
26         //映射文件到指针
27         lpdata = MapViewOfFile(hmap, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0);
28 
29         int a[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
30         memcpy(lpdata, a, 40);
31     }
32 
33     system("pause");
34 
35 
36     UnmapViewOfFile(lpdata);//解除
37     CloseHandle(hmap);
38     system("pause");
39 
40 
41 }

服务器使用这片共享内存

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<Windows.h>
 4 
 5 void main()
 6 {
 7     HANDLE hmapfile = OpenFileMappingA(FILE_MAP_READ, FALSE, "cgwgmem");
 8     if (hmapfile == NULL)
 9     {
10         printf("开辟失败");
11     }
12 
13     //创建指针，指向这片内存
14     LPVOID lpbase = MapViewOfFile(hmapfile, FILE_MAP_READ, 0, 0, 0);
15     if (lpbase == NULL)
16     {
17         printf("open失败");
18 
19     }
20 
21     int*p = lpbase;
22     for (int i = 0; i < 10;i++)
23     {
24         printf("%d
", p[i]);
25     }
26 
27 
28     UnmapViewOfFile(lpbase);//解除
29     CloseHandle(hmapfile);
30 
31 
32     system("pause");
33 }